Adopt b2b.next's client patterns: services, page state, feedback

Ported from the owner's b2b.next and adapted from MudBlazor to the daisyUI
components:
- LocalizableComponentBase provides CascadingState, Navigation, Toast,
  IsLoading/IsDefaultDisabled, WhenOnline/StartOnlinePolling, and after-render
  jobs that actually run.
- CascadingState starts with initialised state and polls the online status
  with a PeriodicTimer. It reports errors through ILoggingService plus a toast,
  and disposes what it holds.
- New pieces:
  - ToastService + ToastHost, the snackbar, with AddResponseError/Success/
    Warning/Exception in SUtility;
  - ErrorViewer, which shows the validation messages plus AdditionalError(s);
  - LoggingService, which writes to the console and the IndexedDB client log.
- HttpService is rebuilt and registered:
  - auth levels Get/Post/Delete, *Anon and *TotallyAnon;
  - retry with backoff;
  - classified failures (FailureCodes) instead of exceptions;
  - HTTP 410 on cancel;
  - the "default" client.
  ReadWebResult and DefaultReadFromJsonAsync read its responses.
- ClientJsonContext is source-generated, and SUtility.DefaultSerializer and
  Blazored.LocalStorage use it.
- WebResult gains a C# 14 IsInvalid extension property.

The code follows the imported rules:
- Every service and async helper takes a CancellationToken last.
- Primary constructors replace constructor-plus-fields.
- MessagesService and IStorage return Task<WebResult> / Task<List<T>>.
  MessagesService is still mock, building its results in memory; the seed
  feed and thread moved to Faker.
- Index and ExpandMessage follow the page pattern: an offline guard with
  WhenOnline, LoadData, and early returns with toasts on the results they used
  to ignore. ExpandMessage reloads on route change and shows "not found"
  instead of a null message.
- Model and state collections are [], and the fake identity defaults moved
  out of the models.
- Components:
  - no ?. chains over initialised state;
  - [Inject] instead of @inject;
  - IsDefaultDisabled on the actions;
  - autocomplete on every text input;
  - Localizer[key, args] instead of string.Format;
  - the localizer no longer leaks its inner _pLocalizer.
- Settings → General gains a language picker (English/Italiano), and
  SetDefaultCulture limits the culture to those two.

Bugs fixed along the way:
- A compose with untouched (null) content passed the empty check.
- File errors were joined with <br/> and rendered as markup.
- ClientLogs.ErrorMessage() threw on warnings.
- CoalescingStringLocalizer[key, args] showed a raw "{0}" for missing keys.
- AppStatusService exposed a call to a JS function that doesn't exist.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

App.razor

@@ -10,18 +10,22 @@
 						}
 						else
 						{
-							<p role="alert">You are not authorized to access this resource.</p>
+							<p role="alert">@Localizer["You are not authorized to access this resource."]</p>
 						}
 					</NotAuthorized>
 				</AuthorizeRouteView>
 				<FocusOnNavigate RouteData="@routeData" Selector="a" />
 			</Found>
 			<NotFound>
-				<Title>Not found</Title>
+				<Title>@Localizer["Not found"]</Title>
 				<LayoutView Layout="@typeof(MainLayout)">
-					<p role="alert">Sorry, there's nothing at this address.</p>
+					<p role="alert">@Localizer["Sorry, there's nothing at this address."]</p>
 				</LayoutView>
 			</NotFound>
 		</Router>
 	</CascadingState>
 </CascadingAuthenticationState>
+
+@code {
+	[Inject] CoalescingStringLocalizer Localizer { get; set; }
+}

ClientJsonContext.cs

@@ -0,0 +1,36 @@
+using System.Text.Json.Serialization;
+
+using decePubClient.Models;
+
+using PrivaPub.ClientModels;
+
+namespace decePubClient;
+
+/// <summary>
+/// Source-generated JSON metadata for the client's own types, used first by SUtility.DefaultSerializer (HTTP) and by
+/// Blazored.LocalStorage (Program.cs). Register every type that crosses HTTP or is stored in localStorage here; types
+/// missing from it still work through the reflection fallback. Names stay camelCase: wwwroot/js/theme.js reads
+/// PublicCacheData.pageSettings straight from localStorage.
+/// </summary>
+[JsonSourceGenerationOptions(PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase, DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
+	IgnoreReadOnlyProperties = true)]
+[JsonSerializable(typeof(PublicCacheData))]
+[JsonSerializable(typeof(PageSettings))]
+[JsonSerializable(typeof(AuthData))]
+[JsonSerializable(typeof(User))]
+[JsonSerializable(typeof(UserClaim))]
+[JsonSerializable(typeof(ActionBarFilter))]
+[JsonSerializable(typeof(Message))]
+[JsonSerializable(typeof(List<Message>))]
+[JsonSerializable(typeof(MessageUser))]
+[JsonSerializable(typeof(BoostingUser))]
+[JsonSerializable(typeof(Media))]
+[JsonSerializable(typeof(MessageForm))]
+[JsonSerializable(typeof(UploadMedia))]
+[JsonSerializable(typeof(ClientLogs))]
+[JsonSerializable(typeof(ClientLogException))]
+[JsonSerializable(typeof(ValidationErrors))]
+[JsonSerializable(typeof(WebResult))]
+public partial class ClientJsonContext : JsonSerializerContext
+{
+}

Components/ActionBar.razor

@@ -65,33 +65,38 @@
 </section>
 
 @code {
-	[CascadingParameter] CascadingState CascadingState { get; set; }
 	[Parameter] public EventCallback<MessageForm> OnMessageSubmit { get; set; }
 	[Parameter] public EventCallback<TimelineType> OnTimelineChanged { get; set; }
 	[Parameter] public EventCallback<TimeSortingType> OnTimeSortingChanged { get; set; }
 	[Inject] ILocalStorageService LocalStorage { get; set; }
-	bool isPosting { get; set; } = false;
+	bool isPosting;
 	ActionBarFilter Filters { get; set; } = new();
 
 	protected override async Task OnInitializedAsync()
 	{
 		var filters = await LocalStorage.GetItemAsync<ActionBarFilter>(nameof(ActionBarFilter));
-		if (filters == default)
+		IsLoading = false;
-			await LocalStorage.SetItemAsync(nameof(ActionBarFilter), Filters);
+		if (filters is not null)
-		else
+		{
 			Filters = filters;
+			return;
+		}
+
+		await LocalStorage.SetItemAsync(nameof(ActionBarFilter), Filters);
 	}
 
 	void OpenCloseMessageForm()
 	{
 		isPosting = !isPosting;
 	}
+
 	async Task OnTimelineChange(TimelineType timelineType)
 	{
 		Filters.TimelineType = timelineType;
 		await LocalStorage.SetItemAsync(nameof(ActionBarFilter), Filters);
 		await OnTimelineChanged.InvokeAsync(Filters.TimelineType);
 	}
+
 	async Task OnTimeSortChange(TimeSortingType timeSorting)
 	{
 		Filters.TimeSortingType = timeSorting;

Components/Content.razor

@@ -3,7 +3,7 @@
 <div class="flex gap-3 w-full rounded-xl neo-raised @(Highlighted ? "neo-sm" : "neo-2xs") @CssContainer">
 
 	<div class="flex flex-col py-3 pl-3 md:py-4 md:pl-4 flex-none rounded-l-xl bg-cover bg-no-repeat bg-center"
-			 style="background-image:linear-gradient(to left, var(--color-base-100), transparent), url('@(Message.User?.BackgroundUrl)');">
+			 style="background-image:linear-gradient(to left, var(--color-base-100), transparent), url('@(Message.User.BackgroundUrl)');">
 
 		<a class="block h-12 w-12 md:h-16 md:w-16" href="@Message.User.ProfileUrl" title="@Message.User.UserName">
 			<img alt="@Message.User.UserName" class="h-12 w-12 md:h-16 md:w-16 object-cover rounded-full neo-raised neo-2xs" src="@(Message.User.PictureUrl ?? "/imgs/icon-192.png")" />
@@ -32,8 +32,8 @@
 					</a>
 				</span>
 				<span class="flex-none inline-flex gap-1 items-center">
-					<span title="@Message.CreatedAt.ToLocalTime().ToString("📅dd/MM/yy 🕒HH:mm")">
+					<span title="@Message.CreatedAt.ToLocalTime().ToString(SUtility.dateTimeFormatExt)">
-						@Message.CreatedAt.GetPassedTime(Localizer._pLocalizer)
+						@Message.CreatedAt.GetPassedTime(Localizer)
 					</span>
 					<i aria-hidden="true" class="@Message.MessageType.GetMessageTypeIcon() text-base"
 						 title="@Localizer[Message.MessageType.ToString()]">
@@ -104,13 +104,13 @@
 			<div class="flex gap-3">
 				@if (OnMessageReply.HasDelegate)
 				{
-					<DButton Size="DSize.Sm" Active="isAnswering" OnClick="Reply" title="@Localizer[isAnswering ? "Close" : "Reply"]">
+					<DButton Size="DSize.Sm" Active="isAnswering" Disabled="IsDefaultDisabled" OnClick="Reply" title="@Localizer[isAnswering ? "Close" : "Reply"]">
 						<i aria-hidden="true" class="@SUtility.IfTrueThen(isAnswering, "ion-md-close-circle", "ion-md-text") text-lg text-success"></i>
 					</DButton>
 				}
 				@if (OnMessageBoost.HasDelegate)
 				{
-					<DButton Size="DSize.Sm" Active="Message.IsBoostedByCurrentUser" OnClick="() => OnMessageBoost.InvokeAsync(Message)"
+					<DButton Size="DSize.Sm" Active="Message.IsBoostedByCurrentUser" Disabled="IsDefaultDisabled" OnClick="() => OnMessageBoost.InvokeAsync(Message)"
 							 title="@Localizer["Boost"]">
 						<i aria-hidden="true" class="ion-md-repeat @SUtility.IfTrueThen(Message.BoostsCounter != 0, null, "text-lg") text-info"></i>
 						@if (Message.BoostsCounter != 0)
@@ -121,7 +121,7 @@
 				}
 				@if (OnMessageFavourite.HasDelegate)
 				{
-					<DButton Size="DSize.Sm" Active="Message.IsFavourite" OnClick="() => OnMessageFavourite.InvokeAsync(Message)"
+					<DButton Size="DSize.Sm" Active="Message.IsFavourite" Disabled="IsDefaultDisabled" OnClick="() => OnMessageFavourite.InvokeAsync(Message)"
 							 title="@Localizer["Favourite"]">
 						<i aria-hidden="true" class="@SUtility.IfTrueThen(Message.IsFavourite, "ion-md-heart-dislike", "ion-md-heart") text-lg text-pink-300"></i>
 					</DButton>
@@ -138,28 +138,29 @@
 					<ChildContent>
 						@if (OnUserDirectMessage.HasDelegate)
 						{
-							<DButton Size="DSize.Sm" class="justify-start whitespace-nowrap" OnClick="() => OnUserDirectMessage.InvokeAsync(Message)">
+							<DButton Size="DSize.Sm" class="justify-start whitespace-nowrap" Disabled="IsDefaultDisabled" OnClick="() => OnUserDirectMessage.InvokeAsync(Message)">
 								<i aria-hidden="true" class="ion-md-paper-plane text-base text-success"></i>
 								<span>@Localizer["Direct message"]</span>
 							</DButton>
 						}
 						@if (OnUserSilence.HasDelegate)
 						{
-							<DButton Size="DSize.Sm" class="justify-start whitespace-nowrap" OnClick="() => OnUserSilence.InvokeAsync(Message.User)">
+							<DButton Size="DSize.Sm" class="justify-start whitespace-nowrap" Disabled="IsDefaultDisabled" OnClick="() => OnUserSilence.InvokeAsync(Message.User)">
 								<i aria-hidden="true" class="ion-md-eye-off text-base drop-shadow-sm text-warning"></i>
 								<span>@Localizer["Mute"]</span>
 							</DButton>
 						}
 						@if (OnUserBlock.HasDelegate)
 						{
-							<DButton Size="DSize.Sm" class="justify-start whitespace-nowrap" OnClick="() => OnUserBlock.InvokeAsync(Message.User)">
+							<DButton Size="DSize.Sm" class="justify-start whitespace-nowrap" Disabled="IsDefaultDisabled" OnClick="() => OnUserBlock.InvokeAsync(Message.User)">
 								<i aria-hidden="true" class="ion-md-remove-circle text-base text-error"></i>
 								<span>@Localizer["Block"]</span>
 							</DButton>
 						}
-						@if (@*Message.User.UserName == CurrentUserName &&*@ OnMessageDelete.HasDelegate)
+						@* Once signed in for real: only for the author's own messages (Message.User.UserId == CascadingState.User.Id). *@
+						@if (OnMessageDelete.HasDelegate)
 						{
-							<DButton Size="DSize.Sm" class="justify-start whitespace-nowrap" OnClick="DeleteMessage" title="@Localizer["Delete"]">
+							<DButton Size="DSize.Sm" class="justify-start whitespace-nowrap" Disabled="IsDefaultDisabled" OnClick="DeleteMessage" title="@Localizer["Delete"]">
 								<i aria-hidden="true" class="ion-md-trash text-lg text-error"></i>
 								<span>@Localizer["Delete"]</span>
 							</DButton>
@@ -184,8 +185,6 @@
 </div>
 
 @code {
-	[CascadingParameter] Task<AuthenticationState> AuthState { get; set; }
-	[CascadingParameter] CascadingState CascadingState { get; set; }
 	[Parameter] public Message Message { get; set; } = new();
 	[Parameter] public EventCallback<MessageForm> OnMessageReply { get; set; }
 	[Parameter] public EventCallback<Message> OnMessageBoost { get; set; }
@@ -200,15 +199,9 @@
 	[Parameter] public bool Highlighted { get; set; }
 	[Parameter] public bool IncludeExpand { get; set; } = true;
 
-	bool isAnswering { get; set; } = false;
+	bool isAnswering;
 
-	string CurrentUserName
+	protected override void OnInitialized() => IsLoading = false;
-	{
-		get
-		{
-			return AuthState.Result.User.Identity?.Name;
-		}
-	}
 
 	async Task DeleteMessage()
 	{
@@ -222,11 +215,8 @@
 		await OnMessageReply.InvokeAsync(messageForm);
 	}
 
-	async Task Reply()
+	void Reply()
 	{
-		await Task.Run(() =>
-		{
-		});
 		isAnswering = !isAnswering;
 	}
 }

Components/Daisy/DataDisplay/DAccordion.razor

@@ -1,4 +1,4 @@
-@inherits DComponentBase
+@inherits DComponentBase
 
 @* daisyUI Accordion: https://daisyui.com/components/accordion/ . Instead of daisyUI's radio group, the open item is an
    index in C# (@bind-Active, -1 = none). Each DAccordionItem registers itself through the cascading value and renders a
@@ -19,7 +19,7 @@
 	/// <summary>Join the items into one block (join join-vertical, join-item).</summary>
 	[Parameter] public bool Joined { get; set; }
 
-	readonly List<DAccordionItem> items = new();
+	readonly List<DAccordionItem> items = [];
 
 	string CssClass => Cx(Joined ? "join join-vertical rounded-box neo-raised" : "flex flex-col gap-2", Class);
 

Components/Daisy/DataDisplay/DAvatar.razor

@@ -18,6 +18,7 @@
 
 @code {
 	[Parameter] public string Src { get; set; }
+	// "" on purpose (the documented exception to "no string defaults"): an empty alt marks a decorative image.
 	[Parameter] public string Alt { get; set; } = "";
 	/// <summary>Shown in the frame when there is no Src, e.g. initials with Placeholder.</summary>
 	[Parameter] public RenderFragment ChildContent { get; set; }

Components/Daisy/DataDisplay/DCarousel.razor

@@ -1,5 +1,4 @@
-@inherits DComponentBase
+@inherits DComponentBase
-@inject NavigationManager NavigationManager
 
 @* daisyUI Carousel: https://daisyui.com/components/carousel/ . A scroll-snap strip of DCarouselItem children; the
    user scrolls or swipes it. Give each item w-full for one slide at a time. ShowNavigation (previous/next on every
@@ -25,6 +24,7 @@
 </CascadingValue>
 
 @code {
+	[Inject] NavigationManager NavigationManager { get; set; }
 	[Parameter] public RenderFragment ChildContent { get; set; }
 	[Parameter] public DCarouselSnap Snap { get; set; }
 	[Parameter] public DDirection Direction { get; set; }
@@ -36,7 +36,7 @@
 	[Parameter] public string NextText { get; set; } = "Next slide";
 	[Parameter] public string SlideText { get; set; } = "Slide";
 
-	readonly List<DCarouselItem> items = new();
+	readonly List<DCarouselItem> items = [];
 	readonly string uid = "d" + Guid.NewGuid().ToString("N")[..8];
 
 	RenderFragment Strip => @<div @attributes="AdditionalAttributes" class="@CssClass">@ChildContent</div>;

Components/Daisy/DataDisplay/DHoverGallery.razor

@@ -16,6 +16,7 @@
 
 @code {
 	[Parameter] public IEnumerable<string> Images { get; set; }
+	// "" on purpose (the documented exception to "no string defaults"): an empty alt marks a decorative image.
 	[Parameter] public string Alt { get; set; } = "";
 	[Parameter] public RenderFragment ChildContent { get; set; }
 }

Components/Daisy/Navigation/DTabs.razor

@@ -1,4 +1,4 @@
-@inherits DComponentBase
+@inherits DComponentBase
 
 @* daisyUI Tab: https://daisyui.com/components/tab/ . Each DTab child registers itself through the cascading value;
    DTabs renders the tab buttons and the active tab's content. The active tab is an index (@bind-Active). *@
@@ -35,7 +35,7 @@
 	[Parameter] public bool Bottom { get; set; }
 	[Parameter] public string ContentClass { get; set; } = "pt-4";
 
-	readonly List<DTab> tabs = new();
+	readonly List<DTab> tabs = [];
 
 	string CssClass => Cx("tabs", VariantClass, SizeClass, Bottom ? "tabs-bottom" : null, Class);
 

Components/ErrorViewer.razor

@@ -0,0 +1,58 @@
+@implements IDisposable
+
+@* In-page errors (b2b.next's WidmannErrorViewer): the validation messages of the cascading EditContext, then
+   AdditionalError (one message) and AdditionalErrors (a list; never join a list into one string), one <li> each.
+   Renders nothing when there is nothing to show. Messages are text, not markup: they can contain file names. *@
+@if (HasContent)
+{
+	<DAlert Color="@(Severity is ErrorViewerSeverity.Warning ? DAlertColor.Warning : DAlertColor.Error)" Variant="DAlertVariant.Soft"
+			class="@Cx("text-sm", ContainerClass)">
+		<ul class="list-inside list-disc">
+			@foreach (var message in Messages)
+			{
+				<li>@message</li>
+			}
+		</ul>
+	</DAlert>
+}
+
+@code {
+	[CascadingParameter] EditContext EditContext { get; set; }
+	[Parameter] public string ContainerClass { get; set; }
+	[Parameter] public ErrorViewerSeverity Severity { get; set; }
+	[Parameter] public string AdditionalError { get; set; }
+	[Parameter] public IEnumerable<string> AdditionalErrors { get; set; } = [];
+
+	EditContext subscribedEditContext;
+
+	IEnumerable<string> Messages =>
+		(EditContext?.GetValidationMessages() ?? [])
+		.Append(AdditionalError)
+		.Concat(AdditionalErrors)
+		.Where(message => !string.IsNullOrEmpty(message));
+
+	bool HasContent => Messages.Any();
+
+	static string Cx(params string[] classes) => DCx.Join(classes);
+
+	protected override void OnParametersSet()
+	{
+		if (EditContext == subscribedEditContext)
+			return;
+
+		Unsubscribe();
+		subscribedEditContext = EditContext;
+		if (subscribedEditContext is not null)
+			subscribedEditContext.OnValidationStateChanged += OnValidationStateChanged;
+	}
+
+	void OnValidationStateChanged(object sender, ValidationStateChangedEventArgs e) => _ = InvokeAsync(StateHasChanged);
+
+	void Unsubscribe()
+	{
+		if (subscribedEditContext is not null)
+			subscribedEditContext.OnValidationStateChanged -= OnValidationStateChanged;
+	}
+
+	public void Dispose() => Unsubscribe();
+}

Components/ErrorViewerSeverity.cs

@@ -0,0 +1,7 @@
+namespace decePubClient.Components;
+
+public enum ErrorViewerSeverity
+{
+	Error,
+	Warning
+}

Components/MessageUpsertForm.razor

@@ -4,15 +4,15 @@
 	<DataAnnotationsValidator />
 
 	<div class="flex flex-col mb-3">
-		<DInput TValue="string" class="w-full rounded-t-[1.4rem] rounded-b-lg" maxlength="64"
+		<DInput TValue="string" class="w-full rounded-t-[1.4rem] rounded-b-lg" maxlength="64" autocomplete="off"
 				placeholder="@Localizer["Title (optional)"]" Value="@MessageForm.Title"
 				ValueChanged="(v) => OnTitleChanged(v)"
 				ValueExpression="() => MessageForm.Title" />
 		<div class="relative mt-1">
 			<DTextarea TValue="string" @bind-Value="MessageForm.Content" Immediate="true"
-					   class="w-full rounded-b-[1.4rem] rounded-t-lg" maxlength="5000"
+					   class="w-full rounded-b-[1.4rem] rounded-t-lg" maxlength="@MaxContentLength" autocomplete="off"
 					   placeholder="@Localizer["oh shit... here we go again"]" rows="3" />
-			<span class="absolute text-xs opacity-50 right-2 bottom-1">@(MessageForm.Content?.Length ?? 0)/5000</span>
+			<span class="absolute text-xs opacity-50 right-2 bottom-1">@ContentLength/@MaxContentLength</span>
 		</div>
 		@if (showPreviewButton && isPreviewOpen && MessageForm.Content is { Length: > 0 })
 		{
@@ -30,10 +30,6 @@
 				</div>
 			</div>
 		}
-		<div class="text-error text-sm">
-			<ValidationMessage For="() => MessageForm.Content" />
-			@contentError
-		</div>
 	</div>
 
 	<div class="flex flex-col gap-3 mb-3 @SUtility.IfTrueThen(MessageForm.Media.Count == 0, "hidden")">
@@ -51,14 +47,14 @@
 										<i class="ion-md-image"></i> <b>@media.FileName</b>
 									</p>
 									<p class="text-xs break-all">
-										<i class="ion-md-code"></i> @media.ContentType <i class="ion-md-fitness"></i> @media.Size.GetFileSize(Localizer._pLocalizer)
+										<i class="ion-md-code"></i> @media.ContentType <i class="ion-md-fitness"></i> @media.Size.GetFileSize(Localizer)
 									</p>
 								</div>
 								<DButton Size="DSize.Sm" class="self-start" OnClick="() => RemoveFile(media)">
 									<i class="ion-md-trash text-base text-red-400"></i>
 								</DButton>
 							</div>
-							<DTextarea TValue="string" @bind-Value="media.AltText" Size="DSize.Sm" class="w-full rounded-lg!"
+							<DTextarea TValue="string" @bind-Value="media.AltText" Size="DSize.Sm" class="w-full rounded-lg!" autocomplete="off"
 									   placeholder="@Localizer["Alternative text"]" rows="1" />
 						</div>
 					</div>
@@ -74,7 +70,7 @@
 								<b>@media.FileName</b>
 							</p>
 							<p class="text-xs break-all">
-								<i class="ion-md-code"></i> @media.ContentType <i class="ion-md-fitness"></i> @media.Size.GetFileSize(Localizer._pLocalizer)
+								<i class="ion-md-code"></i> @media.ContentType <i class="ion-md-fitness"></i> @media.Size.GetFileSize(Localizer)
 							</p>
 						</div>
 						<DButton Size="DSize.Sm" OnClick="() => RemoveFile(media)">
@@ -92,7 +88,7 @@
 								<b>@media.FileName</b>
 							</p>
 							<p class="text-xs break-all">
-								<i class="ion-md-code"></i> @media.ContentType <i class="ion-md-fitness"></i> @media.Size.GetFileSize(Localizer._pLocalizer)
+								<i class="ion-md-code"></i> @media.ContentType <i class="ion-md-fitness"></i> @media.Size.GetFileSize(Localizer)
 							</p>
 							<audio controls="controls" class="w-full max-h-8">
 								<source src="@media.Base64Preview" type="@media.ContentType">
@@ -108,19 +104,14 @@
 
 	</div>
 
-	@if (fileInputErrorMessage is { Length: > 0 })
+	<ErrorViewer ContainerClass="mb-3" AdditionalError="@contentError" AdditionalErrors="fileErrors" />
-	{
-		<div class="text-error text-sm p-1 md:p-2 mb-3 rounded-xl neo-inset neo-2xs">
-			@((MarkupString)fileInputErrorMessage)
-		</div>
-	}
 
 	<div class="flex flex-wrap items-start justify-between gap-3">
 		<div class="flex flex-wrap items-start gap-3">
 			<DDropdown @bind-IsOpen="MessageForm.IsScopeOptionsOpen"
 					   TriggerClass="@(MessageForm.IsScopeOptionsOpen ? "btn btn-sm btn-active" : "btn btn-sm")"
 					   ContentClass="mt-2 flex gap-2 p-2 rounded-box"
-					   title="@string.Format(Localizer["Message scope type: {0}"], Localizer[MessageForm.MessageType.ToString()])">
+					   title="@Localizer["Message scope type: {0}", Localizer[MessageForm.MessageType.ToString()]]">
 				<Trigger>
 					<i class="@MessageForm.MessageType.GetMessageTypeIcon() text-base"></i>
 				</Trigger>
@@ -180,9 +171,6 @@
 						}
 					</ChildContent>
 				</DSelect>
-				<div class="text-error text-sm">
-					<ValidationMessage For="() => MessageForm.ContentType" />
-				</div>
 			</div>
 
 			@if (showPreviewButton)
@@ -194,7 +182,7 @@
 
 		</div>
 
-		<DButton Size="DSize.Sm" Type="submit">
+		<DButton Size="DSize.Sm" Type="submit" Disabled="IsDefaultDisabled">
 			<span>@Localizer["Post"]</span>
 			<i class="ion-md-send"></i>
 		</DButton>
@@ -204,16 +192,46 @@
 </EditForm>
 
 @code {
-	[CascadingParameter] CascadingState CascadingState { get; set; }
+	const int MaxContentLength = 5_000;
+
+	[Inject] ILoggingService Logger { get; set; }
 	[Parameter] public Message AnsweringMessage { get; set; }
 	[Parameter] public EventCallback<MessageForm> OnMessageSubmit { get; set; }
 	MessageForm MessageForm { get; set; } = new();
-	int totalCharacters { get; set; } = 0;
+	List<string> fileErrors = [];
-	string fileInputErrorMessage { get; set; }
+	string contentError;
-	string contentError { get; set; }
+	string acceptedFilesTypes = ".jpg,.jpeg,.png,.gif";
-	string acceptedFilesTypes { get; set; } = ".jpg,.jpeg,.png,.gif";
+	bool showPreviewButton;
-	bool showPreviewButton { get; set; } = false;
+	bool isPreviewOpen;
-	bool isPreviewOpen { get; set; } = false;
+
+	// Content is null until the user types: a form starts without text.
+	int ContentLength => MessageForm.Content?.Length ?? 0;
+
+	int MaximumFileCount => MessageForm.MediaType switch
+	{
+		MediaType.Images => 5,
+		MediaType.Video or MediaType.Audio => 1,
+		MediaType.Documents => 3,
+		_ => 0
+	};
+
+	long MaximumFileSize => MessageForm.MediaType switch
+	{
+		MediaType.Images or MediaType.Documents => 3_145_728,
+		MediaType.Audio => 5_242_880,
+		MediaType.Video => 20_971_520,
+		_ => 0
+	};
+
+	protected override void OnInitialized()
+	{
+		IsLoading = false;
+		if (AnsweringMessage is null)
+			return;
+
+		MessageForm.Title = AnsweringMessage.Title;
+		MessageForm.RootMessageId = AnsweringMessage.RootMessageId ?? AnsweringMessage.MessageId;
+	}
 
 	void UpdateMessageType(MessageType messageType)
 	{
@@ -221,114 +239,68 @@
 		MessageForm.IsScopeOptionsOpen = false;
 	}
 
-	protected override void OnInitialized()
+	bool ShouldDisableUpload() => MessageForm.Media.Count >= MaximumFileCount;
-	{
-		if (AnsweringMessage != default)
-		{
-			MessageForm.Title = AnsweringMessage.Title;
-			MessageForm.RootMessageId = AnsweringMessage.RootMessageId ?? AnsweringMessage.MessageId;
-		}
-	}
 
-	bool ShouldDisableUpload()
+	bool ShouldHaveMultipleUpload() => MessageForm.MediaType is MediaType.Images or MediaType.Documents;
-	{
-		switch (MessageForm.MediaType)
-		{
-			case MediaType.Images:
-				return MessageForm.Media.Count == 5;
-			case MediaType.Video:
-			case MediaType.Audio:
-				return MessageForm.Media.Count == 1;
-			case MediaType.Documents:
-				return MessageForm.Media.Count == 3;
-			default:
-				return true;
-		}
-	}
-
-	bool ShouldHaveMultipleUpload()
-	{
-		return MessageForm.MediaType is MediaType.Images or MediaType.Documents;
-	}
 
 	async Task OnFileChange(InputFileChangeEventArgs eventArgs)
 	{
-		try
+		fileErrors = [];
-		{
+		var maximumFileCount = MaximumFileCount;
-			fileInputErrorMessage = string.Empty;
-			var maximumFileCount = MessageForm.MediaType switch
-			{
-				MediaType.Images => 5,
-				MediaType.Audio => 1,
-				MediaType.Video => 1,
-				MediaType.Documents => 3,
-				_ => 0
-			};
-			if (eventArgs.FileCount > maximumFileCount)
-			{
-				fileInputErrorMessage = string.Format(Localizer["The maximum number of files accepted is {0}, but {1} were supplied."], maximumFileCount, eventArgs.FileCount);
-				return;
-			}
 		if (eventArgs.FileCount + MessageForm.Media.Count > maximumFileCount)
 		{
-				fileInputErrorMessage = string.Format(Localizer["The maximum number of files accepted is {0}, but {1} were supplied."], maximumFileCount, $"{MessageForm.Media.Count}+{eventArgs.FileCount}");
+			fileErrors.Add(Localizer["The maximum number of files accepted is {0}, but {1} were supplied.", maximumFileCount,
+				MessageForm.Media.Count + eventArgs.FileCount]);
 			return;
 		}
-			var maxAllowedSize = MessageForm.MediaType switch
+
-			{
+		var maximumFileSize = MaximumFileSize;
-				MediaType.Images => 3_145_728,
-				MediaType.Audio => 5_242_880,
-				MediaType.Video => 20_971_520,
-				MediaType.Documents => 3_145_728,
-				_ => 0
-			};
-			var uploadMedia = default(UploadMedia);
-			using (var memStream = new MemoryStream())
 		foreach (var file in eventArgs.GetMultipleFiles(maximumFileCount))
 		{
-					if (file.Name == default || file.ContentType == default) continue;
+			if (file.Name == default || file.ContentType == default || MessageForm.Media.Any(m => m.FileName == file.Name))
-					if (MessageForm.Media.Any(m => m.FileName == file.Name)) continue;
+				continue;
-					if (file.Size > maxAllowedSize)
+
+			if (file.Size > maximumFileSize)
 			{
-						fileInputErrorMessage += string.Format(Localizer["Supplied file \"{0}\" with size {1:N0}MBs exceeds the maximum of {2:N0}MBs."], file.Name, file.Size / 1_048_576, maxAllowedSize / 1_048_576) + "<br/>";
+				fileErrors.Add(Localizer["Supplied file \"{0}\" with size {1} exceeds the maximum of {2}.", file.Name,
+					file.Size.GetFileSize(Localizer), maximumFileSize.GetFileSize(Localizer)]);
 				continue;
 			}
 
-					uploadMedia = new()
+			var uploadMedia = await ReadFile(file, maximumFileSize);
+			if (uploadMedia is null)
 			{
-							FileName = file.Name,
+				fileErrors.Add(Localizer["The file \"{0}\" could not be read.", file.Name]);
-							ContentType = file.ContentType,
-							Size = file.Size
-						};
-					try
-					{
-						using (var imgStream = file.OpenReadStream(maxAllowedSize))
-						{
-							await imgStream.CopyToAsync(memStream);
-							memStream.Position = 0;
-							uploadMedia.Blob = memStream.ToArray();
-							await memStream.FlushAsync();
-						}
-					}
-					catch (IOException e)
-					{
-						fileInputErrorMessage = e.Message;
 				continue;
 			}
-					catch (Exception e)
-					{
-						fileInputErrorMessage = e.Message;
-						continue;
-					}
-					if (MessageForm.MediaType is MediaType.Images or MediaType.Audio)
-						uploadMedia.Base64Preview = $"data:{uploadMedia.ContentType};base64,{Convert.ToBase64String(uploadMedia.Blob)}";
 
 			MessageForm.Media.Add(uploadMedia);
 		}
 	}
-		catch (Exception e)
+
+	/// <summary>Reads a picked file into memory; null when the browser can't read it (logged).</summary>
+	async Task<UploadMedia> ReadFile(IBrowserFile file, long maximumFileSize, CancellationToken cancellationToken = default)
 	{
-			fileInputErrorMessage = e.Message;
+		try
+		{
+			using var memoryStream = new MemoryStream();
+			await using var fileStream = file.OpenReadStream(maximumFileSize, cancellationToken);
+			await fileStream.CopyToAsync(memoryStream, cancellationToken);
+			var uploadMedia = new UploadMedia
+			{
+				FileName = file.Name,
+				ContentType = file.ContentType,
+				Size = file.Size,
+				Blob = memoryStream.ToArray()
+			};
+			if (MessageForm.MediaType is MediaType.Images or MediaType.Audio)
+				uploadMedia.Base64Preview = $"data:{uploadMedia.ContentType};base64,{Convert.ToBase64String(uploadMedia.Blob)}";
+			return uploadMedia;
+		}
+		catch (Exception ex)
+		{
+			await Logger.ProcessError(ex, $"{nameof(MessageUpsertForm)}.{nameof(ReadFile)}:{file.Name}", cancellationToken);
+			return default;
 		}
 	}
 
@@ -342,12 +314,6 @@
 		MessageForm.Title = value;
 	}
 
-	void ContentLengthChanged()
-	{
-		totalCharacters = MessageForm.Content?.Length ?? 0;
-		StateHasChanged();
-	}
-
 	void OnContentTypeChanged(ContentType contentType)
 	{
 		MessageForm.ContentType = contentType;
@@ -375,7 +341,7 @@
 	async Task OnValidSubmit()
 	{
 		contentError = default;
-		if ((MessageForm.Content is { Length: 0 } && MessageForm.Media.Count == 0))
+		if (string.IsNullOrWhiteSpace(MessageForm.Content) && MessageForm.Media.Count == 0)
 		{
 			contentError = Localizer["Missing content, either message or media"];
 			return;

Components/Styleguide/DataInputSection.razor

@@ -11,31 +11,31 @@
 			<div class="flex flex-wrap items-center gap-2">
 				@foreach (var color in Enum.GetValues<DColor>())
 				{
-					<DInput @bind-Value="text" Color="color" placeholder="@color.ToString()" class="w-36" />
+					<DInput autocomplete="off" @bind-Value="text" Color="color" placeholder="@color.ToString()" class="w-36" />
 				}
 			</div>
 			<div class="flex flex-wrap items-center gap-2">
-				<DInput @bind-Value="text" Size="DSize.Xs" placeholder="Xs" class="w-28" />
+				<DInput autocomplete="off" @bind-Value="text" Size="DSize.Xs" placeholder="Xs" class="w-28" />
-				<DInput @bind-Value="text" Size="DSize.Sm" placeholder="Sm" class="w-28" />
+				<DInput autocomplete="off" @bind-Value="text" Size="DSize.Sm" placeholder="Sm" class="w-28" />
-				<DInput @bind-Value="text" placeholder="Md" class="w-28" />
+				<DInput autocomplete="off" @bind-Value="text" placeholder="Md" class="w-28" />
-				<DInput @bind-Value="text" Size="DSize.Lg" placeholder="Lg" class="w-28" />
+				<DInput autocomplete="off" @bind-Value="text" Size="DSize.Lg" placeholder="Lg" class="w-28" />
-				<DInput @bind-Value="text" Size="DSize.Xl" placeholder="Xl" class="w-28" />
+				<DInput autocomplete="off" @bind-Value="text" Size="DSize.Xl" placeholder="Xl" class="w-28" />
 			</div>
 			<div class="flex flex-wrap items-center gap-2">
-				<DInput @bind-Value="text" Ghost="true" placeholder="Ghost" />
+				<DInput autocomplete="off" @bind-Value="text" Ghost="true" placeholder="Ghost" />
-				<DInput @bind-Value="text" disabled placeholder="Disabled" />
+				<DInput autocomplete="off" @bind-Value="text" disabled placeholder="Disabled" />
-				<DInput @bind-Value="search" Immediate="true" placeholder="Search">
+				<DInput autocomplete="off" @bind-Value="search" Immediate="true" placeholder="Search">
 					<Prefix><i class="ion-md-search opacity-50"></i></Prefix>
 					<Suffix><kbd class="kbd kbd-sm">⌘</kbd><kbd class="kbd kbd-sm">K</kbd></Suffix>
 				</DInput>
-				<DInput @bind-Value="site" Color="DColor.Primary">
+				<DInput autocomplete="off" @bind-Value="site" Color="DColor.Primary">
 					<Prefix><DLabel>https://</DLabel></Prefix>
 					<Suffix><DLabel>.com</DLabel></Suffix>
 				</DInput>
 			</div>
 			<p class="text-sm opacity-60">Immediate search: "@search", text: "@text"</p>
 			<div class="flex flex-col">
-				<DInput @bind-Value="model.Name" Validator="true" placeholder="Name (required)" class="w-full max-w-xs" />
+				<DInput autocomplete="off" @bind-Value="model.Name" Validator="true" placeholder="Name (required)" class="w-full max-w-xs" />
 				<DValidatorHint>Name is required</DValidatorHint>
 			</div>
 		</section>
@@ -82,22 +82,22 @@
 			<div class="grid grid-cols-3 gap-2">
 				@foreach (var color in Enum.GetValues<DColor>())
 				{
-					<DTextarea @bind-Value="bio" Color="color" placeholder="@color.ToString()" class="min-h-0 h-12" />
+					<DTextarea autocomplete="off" @bind-Value="bio" Color="color" placeholder="@color.ToString()" class="min-h-0 h-12" />
 				}
 			</div>
 			<div class="flex flex-wrap items-start gap-2">
-				<DTextarea @bind-Value="bio" Size="DSize.Xs" placeholder="Xs" class="w-24" />
+				<DTextarea autocomplete="off" @bind-Value="bio" Size="DSize.Xs" placeholder="Xs" class="w-24" />
-				<DTextarea @bind-Value="bio" Size="DSize.Sm" placeholder="Sm" class="w-24" />
+				<DTextarea autocomplete="off" @bind-Value="bio" Size="DSize.Sm" placeholder="Sm" class="w-24" />
-				<DTextarea @bind-Value="bio" placeholder="Md" class="w-24" />
+				<DTextarea autocomplete="off" @bind-Value="bio" placeholder="Md" class="w-24" />
-				<DTextarea @bind-Value="bio" Size="DSize.Lg" placeholder="Lg" class="w-24" />
+				<DTextarea autocomplete="off" @bind-Value="bio" Size="DSize.Lg" placeholder="Lg" class="w-24" />
-				<DTextarea @bind-Value="bio" Size="DSize.Xl" placeholder="Xl" class="w-24" />
+				<DTextarea autocomplete="off" @bind-Value="bio" Size="DSize.Xl" placeholder="Xl" class="w-24" />
 			</div>
 			<div class="flex flex-wrap items-start gap-2">
-				<DTextarea @bind-Value="bio" Ghost="true" placeholder="Ghost" />
+				<DTextarea autocomplete="off" @bind-Value="bio" Ghost="true" placeholder="Ghost" />
-				<DTextarea @bind-Value="bio" disabled placeholder="Disabled" />
+				<DTextarea autocomplete="off" @bind-Value="bio" disabled placeholder="Disabled" />
 			</div>
 			<div class="flex flex-col">
-				<DTextarea @bind-Value="model.Bio" Immediate="true" Validator="true" placeholder="Bio, 10 to 140 characters" class="w-full" />
+				<DTextarea autocomplete="off" @bind-Value="model.Bio" Immediate="true" Validator="true" placeholder="Bio, 10 to 140 characters" class="w-full" />
 				<DValidatorHint>Between 10 and 140 characters</DValidatorHint>
 				<span class="text-sm opacity-60">@(model.Bio?.Length ?? 0)/140</span>
 			</div>
@@ -286,21 +286,21 @@
 				<Legend>Page details</Legend>
 				<ChildContent>
 					<DLabel>Title</DLabel>
-					<DInput @bind-Value="text" placeholder="My awesome page" />
+					<DInput autocomplete="off" @bind-Value="text" placeholder="My awesome page" />
 					<DLabel>Slug</DLabel>
-					<DInput @bind-Value="site" placeholder="my-awesome-page" />
+					<DInput autocomplete="off" @bind-Value="site" placeholder="my-awesome-page" />
 				</ChildContent>
 				<Description>You can edit these later</Description>
 			</DFieldset>
 			<DFieldset disabled>
 				<Legend>Disabled fieldset</Legend>
-				<ChildContent><DInput @bind-Value="text" placeholder="Can't type here" /></ChildContent>
+				<ChildContent><DInput autocomplete="off" @bind-Value="text" placeholder="Can't type here" /></ChildContent>
 			</DFieldset>
 			<DLabel Floating="true" Text="Your email">
-				<DInput @bind-Value="email" placeholder="mail@site.com" />
+				<DInput autocomplete="off" @bind-Value="email" placeholder="mail@site.com" />
 			</DLabel>
 			<DLabel Floating="true" Text="Notes">
-				<DTextarea @bind-Value="bio" placeholder="Notes" />
+				<DTextarea autocomplete="off" @bind-Value="bio" placeholder="Notes" />
 			</DLabel>
 		</section>
 
@@ -308,11 +308,11 @@
 			<h3 class="text-lg font-bold">DValidator / DValidatorHint</h3>
 			<p class="text-sm opacity-60">Native rules, checked by the browser once you've edited the field.</p>
 			<div class="flex flex-col">
-				<DInput @bind-Value="email" Type="email" Validator="true" required="true" placeholder="mail@site.com" />
+				<DInput autocomplete="off" @bind-Value="email" Type="email" Validator="true" required="true" placeholder="mail@site.com" />
 				<DValidatorHint>Enter a valid email address</DValidatorHint>
 			</div>
 			<div class="flex flex-col">
-				<DInput @bind-Value="username" Validator="true" required="true" pattern="[A-Za-z][A-Za-z0-9\-]*" minlength="3"
+				<DInput autocomplete="off" @bind-Value="username" Validator="true" required="true" pattern="[A-Za-z][A-Za-z0-9\-]*" minlength="3"
 						maxlength="30" placeholder="Username" title="Only letters, numbers or dash" />
 				<DValidatorHint Compact="true">Must be 3 to 30 letters, numbers or dashes (Compact: no space while valid)</DValidatorHint>
 			</div>
@@ -375,7 +375,7 @@
 	string framework;
 	DColor? filterColor;
 	string otp;
-	List<string> files = new();
+	List<string> files = [];
 
 	void Submitted(bool valid) => submitResult = valid ? "Valid" : "Invalid: see the messages above";
 

Components/Styleguide/FeedbackSection.razor

@@ -216,7 +216,7 @@
 
 	record Toast(int Id, DAlertColor Color);
 
-	readonly List<Toast> toasts = new();
+	readonly List<Toast> toasts = [];
 	DToastHorizontal toastHorizontal;
 	DToastVertical toastVertical;
 	int toastCount;

Components/Styleguide/LayoutSection.razor

@@ -165,7 +165,7 @@
 			<DButton class="join-item">from lg</DButton>
 		</DJoin>
 		<DJoin>
-			<input class="input join-item" placeholder="Email" />
+			<input autocomplete="off" class="input join-item" placeholder="Email" />
 			<select class="select join-item w-28">
 				<option>Filter</option>
 				<option>Sci-fi</option>

Components/ToastHost.razor

@@ -0,0 +1,41 @@
+@implements IDisposable
+
+@* Shows ToastService's messages at the bottom end of the screen. Placed once, in MainLayout. *@
+@if (Toast.Messages.Count > 0)
+{
+	<DToast class="z-[1000]">
+		@foreach (var message in Toast.Messages)
+		{
+			<DAlert @key="message.Id" Color="ColorOf(message.Severity)" class="max-w-sm">
+				<ChildContent>
+					<span class="break-words">@message.Text</span>
+				</ChildContent>
+				<Actions>
+					<DButton Size="DSize.Xs" Shape="DButtonShape.Circle" Variant="DButtonVariant.Ghost" aria-label="@Localizer["Close"]"
+							 OnClick="() => Toast.Close(message.Id)">
+						<i class="ion-md-close"></i>
+					</DButton>
+				</Actions>
+			</DAlert>
+		}
+	</DToast>
+}
+
+@code {
+	[Inject] ToastService Toast { get; set; }
+	[Inject] CoalescingStringLocalizer Localizer { get; set; }
+
+	protected override void OnInitialized() => Toast.Changed += OnChanged;
+
+	void OnChanged() => _ = InvokeAsync(StateHasChanged);
+
+	static DAlertColor ColorOf(ToastSeverity severity) => severity switch
+	{
+		ToastSeverity.Success => DAlertColor.Success,
+		ToastSeverity.Warning => DAlertColor.Warning,
+		ToastSeverity.Error => DAlertColor.Error,
+		_ => DAlertColor.Info
+	};
+
+	public void Dispose() => Toast.Changed -= OnChanged;
+}

Extensions/ExtensionMethods.cs

@@ -2,6 +2,7 @@
 
 using collAnon.Client.Services;
 
+using decePubClient.Helpers;
 using decePubClient.Models;
 using decePubClient.Services;
 
@@ -16,6 +17,8 @@ using PrivaPub.ClientModels;
 using System.Collections.Specialized;
 using System.ComponentModel;
 using System.Globalization;
+using System.Net;
+using System.Net.Http.Json;
 using System.Text.Json;
 using System.Web;
 
@@ -34,52 +37,46 @@ namespace decePubClient.Extensions
 		public static T QueryString<T>(this NavigationManager navigationManager, string key)
 		{
 			var value = navigationManager.QueryString()[key];
-			var converter = TypeDescriptor.GetConverter(typeof(T));
+			if (!TypeDescriptor.GetConverter(typeof(T)).IsValid(value))
-			if (converter.IsValid(value))
-				return (T)Convert.ChangeType(value, typeof(T));
-			else
 				return default;
+			return (T)Convert.ChangeType(value, typeof(T));
 		}
 
 		#endregion Navigation Manager
 
 		#region Setups
 
-		public static async Task SetDefaultCulture(this WebAssemblyHost host)
+		/// <summary>The languages with resources (Resources/AllStrings.*.resx); any other browser language gets English.</summary>
+		public static readonly string[] SupportedLanguages = ["en", "it"];
+
+		public static async Task SetDefaultCulture(this WebAssemblyHost host, CancellationToken cancellationToken = default)
 		{
-			var culture = default(CultureInfo);
+			var culture = ToCulture(default);
 			try
 			{
 				var storage = host.Services.GetRequiredService<ILocalStorageService>();
-				var publicCache = await storage.GetItemAsync<PublicCacheData>(nameof(PublicCacheData));
+				var publicCache = await storage.GetItemAsync<PublicCacheData>(nameof(PublicCacheData), cancellationToken);
 				if (publicCache is null)
 				{
+					var browserLanguage = host.Services.GetRequiredService<AppStatusService>().Language();
 					publicCache = new();
-					var status = host.Services.GetRequiredService<AppStatusService>();
+					publicCache.PageSettings.CurrentLanguageCode =
-					var browserLanguage = status.Language();
+						SupportedLanguages.FirstOrDefault(language => browserLanguage?.StartsWith(language) ?? false) ?? "en";
-					if (browserLanguage.Contains("en"))
+					await storage.SetItemAsync(nameof(PublicCacheData), publicCache, cancellationToken);
-						browserLanguage = "en-GB";
-					var appConfig = host.Services.GetRequiredService<AppConfiguration>();
-					if (!string.IsNullOrEmpty(publicCache.PageSettings.CurrentLanguageCode) &&
-									publicCache.PageSettings.CurrentLanguageCode.Contains("en"))
-						publicCache.PageSettings.CurrentLanguageCode = "en-GB";
-					culture = new(publicCache.PageSettings.CurrentLanguageCode ?? browserLanguage);
-					publicCache.PageSettings.CurrentLanguageCode = culture.TwoLetterISOLanguageName;
-					await storage.SetItemAsync(nameof(PublicCacheData), publicCache);
 				}
 
-				culture ??= new(publicCache.PageSettings.CurrentLanguageCode == "en" ? "en-GB" : publicCache.PageSettings.CurrentLanguageCode);
+				culture = ToCulture(publicCache.PageSettings.CurrentLanguageCode);
-				CultureInfo.DefaultThreadCurrentCulture = culture;
-				CultureInfo.DefaultThreadCurrentUICulture = culture;
 			}
 			catch (Exception ex)
 			{
 				Console.WriteLine(ex);
-				culture = new("en-GB");
+			}
+
 			CultureInfo.DefaultThreadCurrentCulture = culture;
 			CultureInfo.DefaultThreadCurrentUICulture = culture;
 		}
-		}
+
+		static CultureInfo ToCulture(string languageCode) => languageCode is "it" ? new("it-IT") : new("en-GB");
 
 		#endregion Setups
 
@@ -112,6 +109,64 @@ namespace decePubClient.Extensions
 		public static string ToString(this WebResult webResult, CoalescingStringLocalizer localizer) =>
 				localizer["{0} - {1}", webResult.StatusCode, webResult.ErrorMessage];
 
+		/// <summary>
+		/// Reads a failed response as a WebResult: a failure HttpService made up (FailureHeader) as is, 401/403 and 5xx
+		/// as a generic message, validation ProblemDetails as their errors, anything else as the server's WebResult.
+		/// A cancelled request (410) becomes SUtility.DefaultTaskCancelledResult.
+		/// </summary>
+		public static async Task<WebResult> ReadWebResult(this HttpContent content, HttpStatusCode statusCode,
+			CoalescingStringLocalizer localizer, CancellationToken cancellationToken = default)
+		{
+			if (statusCode is HttpStatusCode.Gone)
+				return SUtility.DefaultTaskCancelledResult;
+
+			var result = new WebResult();
+			try
+			{
+				var json = await content.ReadAsStringAsync(cancellationToken);
+				if (content.Headers.Contains(SUtility.FailureHeader))
+					return JsonSerializer.Deserialize<WebResult>(json, SUtility.DefaultSerializer);
+
+				if (statusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+					return result.Invalidate(localizer["You are not authorized to do this."], (int)statusCode, FailureCodes.Unauthorized);
+
+				if ((int)statusCode > 499)
+					return result.Invalidate(localizer["The server reported an internal error (HTTP {0}).", (int)statusCode], (int)statusCode,
+						FailureCodes.ServerError);
+
+				if (json.Contains("\"title\""))
+				{
+					var validationErrors = JsonSerializer.Deserialize<ValidationErrors>(json, SUtility.DefaultSerializer);
+					var lines = validationErrors.Errors.Select(error => $"{error.Key}: {string.Join(", ", error.Value)}").Prepend(validationErrors.Title);
+					return result.Invalidate(string.Join('\n', lines), validationErrors.Status);
+				}
+
+				return JsonSerializer.Deserialize<WebResult>(json, SUtility.DefaultSerializer) ??
+					result.Invalidate(localizer["The server sent an invalid response."], (int)statusCode);
+			}
+			catch (OperationCanceledException)
+			{
+				return SUtility.DefaultTaskCancelledResult;
+			}
+			catch (Exception ex)
+			{
+				return result.Invalidate(localizer["The server sent an invalid response."], (int)HttpStatusCode.BadRequest, exception: ex);
+			}
+		}
+
+		/// <summary>Reads a successful response body; a cancelled read returns SUtility.CancellationDefault.</summary>
+		public static async Task<T> DefaultReadFromJsonAsync<T>(this HttpResponseMessage response, CancellationToken cancellationToken = default)
+		{
+			try
+			{
+				return await response.Content.ReadFromJsonAsync<T>(SUtility.DefaultSerializer, cancellationToken);
+			}
+			catch (OperationCanceledException)
+			{
+				return SUtility.CancellationDefault<T>();
+			}
+		}
+
 		public static string Timeframe(this DateTime creationDate, CoalescingStringLocalizer localizer)
 		{
 			var timeframe = DateTime.Now - creationDate.ToLocalTime();
@@ -133,19 +188,19 @@ namespace decePubClient.Extensions
 
 		public static AuthorizationPolicy IsAdminPolicy() =>
 				new AuthorizationPolicyBuilder().RequireAuthenticatedUser()
-						.RequireClaim(Policies.IsAdmin, true.ToString().ToLower())
+						.RequireClaim(Policies.IsAdmin, "true")
-						.RequireClaim(Policies.IsUser, true.ToString().ToLower())
+						.RequireClaim(Policies.IsUser, "true")
-						.RequireClaim(Policies.IsModerator, true.ToString().ToLower())
+						.RequireClaim(Policies.IsModerator, "true")
 						.Build();
 
 		public static AuthorizationPolicy IsUserPolicy() =>
 				new AuthorizationPolicyBuilder().RequireAuthenticatedUser()
-						.RequireClaim(Policies.IsUser, true.ToString().ToLower())
+						.RequireClaim(Policies.IsUser, "true")
 						.Build();
 
 		public static AuthorizationPolicy IsUserModeratorPolicy() =>
 				new AuthorizationPolicyBuilder().RequireAuthenticatedUser()
-						.RequireClaim(Policies.IsModerator, true.ToString().ToLower())
+						.RequireClaim(Policies.IsModerator, "true")
 						.Build();
 
 		#endregion

Extensions/GenericExtensions.cs

@@ -1,4 +1,5 @@
-using System.Collections.Specialized;
+using collAnon.Client.Services;
+using System.Collections.Specialized;
 using System.ComponentModel;
 using System.Globalization;
 using System.Reflection;
@@ -56,32 +57,22 @@ public static class GenericExtensions
 		});
 	}
 
-	public static string GetPassedTime(this DateTime dateTime, IStringLocalizer localizer)
+	public static string GetPassedTime(this DateTime dateTime, CoalescingStringLocalizer localizer)
 	{
 		var timeframe = DateTime.Now - dateTime.ToLocalTime();
-		switch ((int)timeframe.TotalHours)
+		return (int)timeframe.TotalHours switch
 		{
-			case >= 24:
+			>= 24 => localizer["{0}d", (int)timeframe.TotalDays],
-				return string.Format(localizer["{0}d"], (int)timeframe.TotalDays);
+			>= 1 => localizer["{0}h", (int)timeframe.TotalHours],
-			case >= 1 and < 24:
+			_ => localizer["{0}m", (int)timeframe.TotalMinutes]
-				return string.Format(localizer["{0}h"], (int)timeframe.TotalHours);
+		};
-			case 0:
-				return string.Format(localizer["{0}m"], (int)timeframe.TotalMinutes);
-			default:
-				return default;
-		}
 	}
 
-	public static string GetFileSize(this long size, IStringLocalizer<AllStrings> localizer)
+	public static string GetFileSize(this long size, CoalescingStringLocalizer localizer) => size switch
 	{
-		switch (size)
+		>= 1_048_576 => localizer["{0}MB", size / 1_048_576],
-		{
+		_ => localizer["{0}KB", size / 1_024]
-			case >= 1_048_576:
+	};
-				return string.Format(localizer["{0:N0}MB"], size / 1_048_576);
-			case < 1_048_576:
-				return string.Format(localizer["{0}KB"], size / 1_024);
-		}
-	}
 
 	public static string ParseContent(this string content, ContentType contentType)
 	{

Extensions/WebResultExtensions.cs

@@ -0,0 +1,12 @@
+using PrivaPub.ClientModels;
+
+namespace decePubClient.Extensions;
+
+public static class WebResultExtensions
+{
+	extension(WebResult result)
+	{
+		/// <summary>The early-return guard (b2b.next's WebResult.IsInvalid, which PrivaPub's WebResult lacks).</summary>
+		public bool IsInvalid => !result.IsValid;
+	}
+}

Helpers/Faker.cs

@@ -1,12 +1,29 @@
 using decePubClient.Models;
+using decePubClient.Models.Types;
+
+using Markdig;
 
 namespace decePubClient.Helpers;
 
+/// <summary>
+/// Mock data until the app is wired to PrivaPub: the signed-in user, the feed shown while IndexedDB holds no messages,
+/// and the thread around an expanded message.
+/// </summary>
 public static class Faker
 {
-	static IReadOnlyList<MessageUser> Users => new List<MessageUser>
+	public static User CurrentUser => new()
 	{
-		new(),
+		Id = "45f14fa8-c40f-4121-997c-ef2542196a50",
+		UserName = "@loosy@letsrulethe.world",
+		DisplayName = "loosy",
+		PictureUrl = "https://letsrulethe.world/media/ddd91d51-dc12-4b82-86a2-2a28cc959183/L51ZAL4QEL07",
+		BackgroundUrl = "https://letsrulethe.world/media/9a3cc6c4-1018-4f41-86c7-f3e63e362bf4/EXM8RUK10B0Z",
+		ProfileUrl = "https://letsrulethe.world/users/loosy"
+	};
+
+	static IReadOnlyList<MessageUser> Users =>
+	[
+		CurrentUser.ToMessageUser(),
 		new()
 		{
 			UserId = "7b5703dc-aee8-46b1-aed2-cd06021a1c0c",
@@ -25,7 +42,7 @@ public static class Faker
 			BackgroundUrl = "https://wallup.net/wp-content/uploads/2016/01/225560-nature-landscape-fall-path-forest-mist-morning-trees-leaves-sunlight.jpg",
 			ProfileUrl = "https://mastodon.uno/web/@valenappi@beta.birdsite.live"
 		}
-	};
+	];
 
 	public static MessageUser GetRandomUser()
 	{
@@ -44,4 +61,237 @@ public static class Faker
 			ProfileUrl = user.ProfileUrl
 		};
 	}
+
+	/// <summary>
+	/// The seed feed. Two entries share a MessageId on purpose: the second is the first one boosted by someone, which
+	/// is how the feed shows a boost (a copy of the message with BoostingUser set).
+	/// </summary>
+	public static List<Message> SeedMessages()
+	{
+		var messages = new List<Message>();
+		messages.Add(new()
+		{
+			RootMessageId = default,
+			MessageId = "992167EE-8947-4823-B1E2-B4E1019B6974",
+			User = GetRandomUser(),
+			MessageType = (MessageType)Random.Shared.Next(0, 4),
+			Title = default,
+			Content = "test di messaggio normale senza titolo",
+			Medias = [],
+			CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+			IsFavourite = Random.Shared.Next() % 2 == 0,
+			BoostsCounter = Random.Shared.Next(0, 100),
+			IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+		});
+		messages.Add(new()
+		{
+			RootMessageId = default,
+			MessageId = "C5307644-4EA8-4B5F-A240-7CFE4DE34741",
+			User = GetRandomUser(),
+			MessageType = (MessageType)Random.Shared.Next(0, 4),
+			Title = "sopra la panca la capra canta",
+			Content = Markdown.ToHtml("test di messaggio con titolo"),
+			Medias = [],
+			CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+			IsFavourite = Random.Shared.Next() % 2 == 0,
+			BoostsCounter = Random.Shared.Next(0, 100),
+			IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+		});
+		messages.Add(new()
+		{
+			RootMessageId = default,
+			MessageId = "E473D562-D210-4453-93DA-157D4B90B0D8",
+			User = GetRandomUser(),
+			MessageType = (MessageType)Random.Shared.Next(0, 4),
+			Title = default,
+			Content = "dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd test di messaggio con overflow del testo",
+			Medias = [],
+			CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+			IsFavourite = Random.Shared.Next() % 2 == 0,
+			BoostsCounter = Random.Shared.Next(0, 100),
+			IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+		});
+		messages.Add(new()
+		{
+			RootMessageId = default,
+			MessageId = "adf89dc6-0484-430e-a7c9-fcb1179b0c28",
+			User = GetRandomUser(),
+			MessageType = (MessageType)Random.Shared.Next(0, 4),
+			Title = default,
+			Content = "test video",
+			Medias =
+			[
+				new()
+				{
+					FileName = "8252d175e714db88beb8ee0349dbac90405d3d5148e96e0cfd7de3b0876dbb1b.mp4",
+					Url = "https://ihatebeinga.live/media/8252d175e714db88beb8ee0349dbac90405d3d5148e96e0cfd7de3b0876dbb1b.mp4",
+					AltText = "https://ihatebeinga.live/media/8252d175e714db88beb8ee0349dbac90405d3d5148e96e0cfd7de3b0876dbb1b.mp4",
+					ContentType = "video/mp4"
+				}
+			],
+			CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+			IsFavourite = Random.Shared.Next() % 2 == 0,
+			BoostsCounter = Random.Shared.Next(0, 100),
+			IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+		});
+		messages.Add(new()
+		{
+			RootMessageId = default,
+			MessageId = "96025b43-5235-44e9-a3fa-98df31edfbfb",
+			User = GetRandomUser(),
+			MessageType = (MessageType)Random.Shared.Next(0, 4),
+			Title = default,
+			Content = "test immagine",
+			Medias =
+			[
+				new()
+				{
+					FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					ContentType = "image/jpg"
+				}
+			],
+			CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+			IsFavourite = Random.Shared.Next() % 2 == 0,
+			BoostsCounter = Random.Shared.Next(0, 100),
+			IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+		});
+		messages.Add(new()
+		{
+			RootMessageId = default,
+			MessageId = "277ca76b-aaad-4aa6-95fb-25f59e2fddf9",
+			User = GetRandomUser(),
+			MessageType = (MessageType)Random.Shared.Next(0, 4),
+			Title = default,
+			Content = "test audio",
+			Medias =
+			[
+				new()
+				{
+					FileName = "09bfb06d0096975f.mp3",
+					Url = "https://cdn.masto.host/mastodonuno/media_attachments/files/107/798/288/501/917/857/original/09bfb06d0096975f.mp3",
+					AltText = "09bfb06d0096975f.mp3",
+					ContentType = "audio/mp3"
+				}
+			],
+			CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+			IsFavourite = Random.Shared.Next() % 2 == 0,
+			BoostsCounter = Random.Shared.Next(0, 100),
+			IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+		});
+		messages.Add(new()
+		{
+			BoostingUser = GetRandomBoostingUser(),
+			RootMessageId = default,
+			MessageId = "de64e520-a7d3-4f31-b5a9-ba236f3b146c",
+			User = GetRandomUser(),
+			MessageType = (MessageType)Random.Shared.Next(0, 4),
+			Title = default,
+			Content = "test immagini",
+			Medias =
+			[
+				new()
+				{
+					FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					ContentType = "image/jpg"
+				},
+				new()
+				{
+					FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					ContentType = "image/jpg"
+				},
+				new()
+				{
+					FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					ContentType = "image/jpg"
+				}
+			],
+			CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+			IsFavourite = Random.Shared.Next() % 2 == 0,
+			BoostsCounter = Random.Shared.Next(0,100),
+			IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+		});
+		messages.Add(new()
+		{
+			RootMessageId = default,
+			MessageId = "de64e520-a7d3-4f31-b5a9-ba236f3b146c",
+			User = GetRandomUser(),
+			MessageType = (MessageType)Random.Shared.Next(0, 4),
+			Title = default,
+			Content = "test immagini",
+			Medias =
+			[
+				new()
+				{
+					FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					ContentType = "image/jpg"
+				},
+				new()
+				{
+					FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					ContentType = "image/jpg"
+				},
+				new()
+				{
+					FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
+					ContentType = "image/jpg"
+				}
+			],
+			CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+			IsFavourite = Random.Shared.Next() % 2 == 0,
+			BoostsCounter = Random.Shared.Next(0,100),
+			IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+		});
+		return messages;
+	}
+
+	/// <summary>The messages before and after an expanded one.</summary>
+	public static (List<Message> Ancestors, List<Message> Descendants) Thread(Message message) =>
+	(
+		[
+			new()
+			{
+				RootMessageId = default,
+				MessageId = "51C698E3-7C28-4C90-9212-48D5C81DE089",
+				User = GetRandomUser(),
+				MessageType = (MessageType)Random.Shared.Next(0, 4),
+				Title = message.Title,
+				Content = "<p>esempio di messaggio <b>precedente</b> a quello espanso</p>",
+				Medias = [],
+				CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+				IsFavourite = Random.Shared.Next() % 2 == 0,
+				BoostsCounter = Random.Shared.Next(0, 100),
+				IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+			}
+		],
+		[
+			new()
+			{
+				RootMessageId = default,
+				MessageId = "0569A1DF-46FC-4485-9F11-F8CDFB794404",
+				User = GetRandomUser(),
+				MessageType = (MessageType)Random.Shared.Next(0, 4),
+				Title = message.Title,
+				Content = "<p>esempio di messaggio <b>successivo</b> a quello espanso</p>",
+				Medias = [],
+				CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
+				IsFavourite = Random.Shared.Next() % 2 == 0,
+				BoostsCounter = Random.Shared.Next(0, 100),
+				IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
+			}
+		]
+	);
 }

Helpers/SUtility.cs

@@ -1,17 +1,101 @@
-using System.Net.Mail;
+using System.Net;
+using System.Net.Http.Json;
+using System.Net.Mail;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Text.Json.Serialization.Metadata;
+
+using decePubClient.Models;
+using decePubClient.Services;
+
+using PrivaPub.ClientModels;
 
 namespace decePubClient.Helpers
 {
 	public static class SUtility
 	{
-		public static T IfTrueThen<T>(bool conditionIsTrue, T ifTrue, T ifFalse = default)
+		public const string dateTimeFormat = "dd/MM/yyyy";
+		public const string timeFormat = "HH:mm";
+		public const string dateTimeFormatExt = "dd/MM/yyyy HH:mm";
+
+		/// <summary>Marks a response HttpService made up itself (a classified failure), not one the server sent.</summary>
+		public const string FailureHeader = "X-DecePub-Failure";
+
+		/// <summary>The JSON options for every HTTP payload: web defaults, ClientJsonContext first, reflection after.</summary>
+		public static JsonSerializerOptions DefaultSerializer { get; } = new(JsonSerializerDefaults.Web)
 		{
-			if (conditionIsTrue)
+			DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
-				return ifTrue;
+			TypeInfoResolver = JsonTypeInfoResolver.Combine(ClientJsonContext.Default, new DefaultJsonTypeInfoResolver())
-			else
+		};
-				return ifFalse;
+
+		/// <summary>What a cancelled request turns into: HTTP 410, which AddResponseError ignores.</summary>
+		public static WebResult DefaultTaskCancelledResult =>
+			new WebResult().Invalidate("Request cancelled, not an error.", (int)HttpStatusCode.Gone, FailureCodes.Cancelled);
+
+		public static HttpResponseMessage DefaultTaskCancelled() =>
+			ClassifiedFailure(FailureCodes.Cancelled, DefaultTaskCancelledResult.ErrorMessage, HttpStatusCode.Gone);
+
+		public static HttpResponseMessage DefaultUnauthorized(string message) =>
+			ClassifiedFailure(FailureCodes.Unauthorized, message, HttpStatusCode.Unauthorized);
+
+		/// <summary>A response carrying an invalid WebResult, tagged with FailureHeader so ReadWebResult reads it as is.</summary>
+		public static HttpResponseMessage ClassifiedFailure(string failureCode, string message, HttpStatusCode statusCode)
+		{
+			var content = JsonContent.Create(new WebResult().Invalidate(message, (int)statusCode, failureCode), options: DefaultSerializer);
+			content.Headers.Add(FailureHeader, failureCode);
+			return new(statusCode) { Content = content };
 		}
 
+		/// <summary>The value a cancelled read returns: default for value types, an empty list for list interfaces.</summary>
+		public static T CancellationDefault<T>()
+		{
+			var type = typeof(T);
+			if (type.IsValueType)
+				return default;
+			if (type.IsInterface && type.IsGenericType &&
+				type.GetGenericTypeDefinition() is var definition &&
+				(definition == typeof(IEnumerable<>) || definition == typeof(ICollection<>) || definition == typeof(IList<>) ||
+				 definition == typeof(IReadOnlyCollection<>) || definition == typeof(IReadOnlyList<>)))
+				return (T)Activator.CreateInstance(typeof(List<>).MakeGenericType(type.GetGenericArguments()[0]));
+			if (type.IsInterface || type.IsAbstract || type.GetConstructor(Type.EmptyTypes) is null)
+				return default;
+			return Activator.CreateInstance<T>();
+		}
+
+		#region Toasts
+
+		/// <summary>Shows a failed result: connectivity failures as warnings, the rest as errors; cancellations not at all.</summary>
+		public static void AddResponseError(this ToastService toast, WebResult result)
+		{
+			if (result.StatusCode is (int)HttpStatusCode.Gone)
+				return;
+
+			if (FailureCodes.IsConnectivity(result.ErrorCode))
+			{
+				toast.Add(ToastSeverity.Warning, result.ErrorMessage);
+				return;
+			}
+
+			toast.Add(ToastSeverity.Error, $"{result.StatusCode} - {result.ErrorMessage}");
+		}
+
+		public static void AddResponseError(this ToastService toast, string message) =>
+			toast.Add(ToastSeverity.Error, message);
+
+		public static void AddResponseSuccess(this ToastService toast, string message) =>
+			toast.Add(ToastSeverity.Success, message, TimeSpan.FromSeconds(5));
+
+		public static void AddWarning(this ToastService toast, string message) =>
+			toast.Add(ToastSeverity.Warning, message);
+
+		public static void AddException(this ToastService toast, Exception exception) =>
+			toast.Add(ToastSeverity.Error, exception.Message);
+
+		#endregion
+
+		public static T IfTrueThen<T>(bool conditionIsTrue, T ifTrue, T ifFalse = default) =>
+			conditionIsTrue ? ifTrue : ifFalse;
+
 		public static bool TimeBetween(this DateTime datetime, TimeSpan start, TimeSpan end)
 		{
 			// convert datetime to a TimeSpan

LayerComponents/CascadingState.razor

@@ -1,138 +1,111 @@
-<CascadingValue IsFixed=false Value=this>
+@implements IAsyncDisposable
+
+@* The app-wide state, cascaded to every page and component (LocalizableComponentBase.CascadingState): the saved
+   PublicCacheData with its theme settings, the signed-in user, and whether the app is online, polled every 10 seconds. *@
+<CascadingValue IsFixed=false Value=this>
 	@ChildContent
 </CascadingValue>
 
 @code {
 	[Parameter] public RenderFragment ChildContent { get; set; }
-	[Inject] IStorage DbStorage { get; set; }
 	[Inject] ILocalStorageService Storage { get; set; }
 	[Inject] IJSRuntime JS { get; set; }
-	// [Inject] DataService DataService { get; set; }
 	[Inject] public AppStatusService Status { get; set; }
-	[Inject] ILogger<CascadingState> Logger { get; set; }
+	[Inject] ILoggingService Logger { get; set; }
+	[Inject] ToastService Toast { get; set; }
 
-	public bool IsOnline { get; set; } = true;
+	public bool IsOnline { get; private set; } = true;
-	Timer IsOnlineTimer { get; set; }
+	public bool IsOffline => !IsOnline;
-	public PublicCacheData PublicCacheData { get; set; }
+	public PublicCacheData PublicCacheData { get; private set; } = new();
-	public User User { get; set; }
+	/// <summary>The signed-in user; Faker's until the login is wired to PrivaPub.</summary>
+	public User User { get; private set; } = Faker.CurrentUser;
 
 	DotNetObjectReference<CascadingState> cascadingStateReference;
+	PeriodicTimer onlineTimer;
+	readonly CancellationTokenSource disposeCancellation = new();
 
 	protected override async Task OnInitializedAsync()
 	{
+		var cancellationToken = disposeCancellation.Token;
 		try
 		{
-			IsOnlineTimer = new Timer(async _ => await UpdateIsOnline(), new AutoResetEvent(false), 0, 10000);
 			cascadingStateReference = DotNetObjectReference.Create(this);
-			await JS.InvokeVoidAsync("cascadingStateInstanceReference", cascadingStateReference);
+			await JS.InvokeVoidAsync("cascadingStateInstanceReference", cancellationToken, cascadingStateReference);
-			PublicCacheData = await Storage.GetItemAsync<PublicCacheData>(nameof(PublicCacheData));
-			if (PublicCacheData == null)
-			{
-				PublicCacheData = new();
-				await UpdatePublicCache(PublicCacheData);
-			}
-			else
-				Status.ApplyTheme(PublicCacheData.PageSettings);
 
-			User = new();
+			var publicCacheData = await Storage.GetItemAsync<PublicCacheData>(nameof(PublicCacheData), cancellationToken);
+			await UpdatePublicCache(publicCacheData ?? new(), cancellationToken);
+
+			IsOnline = await Status.IsOnline(cancellationToken);
+			onlineTimer = new(TimeSpan.FromSeconds(10));
+			_ = PollOnline(cancellationToken);
 		}
 		catch (Exception ex)
 		{
-			Logger.LogError(ex, $"{nameof(CascadingState)}.{nameof(OnInitializedAsync)}");
+			await Logger.ProcessError(ex, $"{nameof(CascadingState)}.{nameof(OnInitializedAsync)}", cancellationToken);
 		}
 	}
 
-	public async ValueTask UpdatePublicCache(PublicCacheData publicCacheData)
+	/// <summary>Saves the public cache, applies its theme and re-renders the app.</summary>
-	{
+	public async ValueTask UpdatePublicCache(PublicCacheData publicCacheData, CancellationToken cancellationToken = default)
-		try
 	{
 		PublicCacheData = publicCacheData;
-			await Storage.SetItemAsync(nameof(PublicCacheData), PublicCacheData);
+		await Storage.SetItemAsync(nameof(PublicCacheData), PublicCacheData, cancellationToken);
 		Status.ApplyTheme(PublicCacheData.PageSettings);
 		StateHasChanged();
 	}
-		catch (Exception ex)
-		{
-			Console.WriteLine($"{nameof(CascadingState)}.{nameof(UpdatePublicCache)}");
-			Console.WriteLine(ex.ToString());
-		}
-	}
 
 	/// <summary>Changes the page settings, then saves and applies them like UpdatePublicCache.</summary>
-	public ValueTask UpdatePageSettings(Action<PageSettings> change)
+	public ValueTask UpdatePageSettings(Action<PageSettings> change, CancellationToken cancellationToken = default)
 	{
 		change(PublicCacheData.PageSettings);
-		return UpdatePublicCache(PublicCacheData);
+		return UpdatePublicCache(PublicCacheData, cancellationToken);
 	}
 
 	[JSInvokable]
-	public async Task LogFromJs(string message, string where)
+	public async Task LogFromJs(string message, string where) =>
-	{
-		try
-		{
 		await ProcessError(new(message), where);
+
+	async Task PollOnline(CancellationToken cancellationToken)
+	{
+		try
+		{
+			while (await onlineTimer.WaitForNextTickAsync(cancellationToken))
+			{
+				var isOnline = await Status.IsOnline(cancellationToken);
+				if (isOnline == IsOnline)
+					continue;
+
+				IsOnline = isOnline;
+				await InvokeAsync(StateHasChanged);
+			}
+		}
+		catch (OperationCanceledException)
+		{
 		}
 		catch (Exception ex)
 		{
-			Logger.LogError(ex, $"{nameof(CascadingState)}.{nameof(LogFromJs)}");
+			await Logger.ProcessError(ex, $"{nameof(CascadingState)}.{nameof(PollOnline)}", cancellationToken);
 		}
 	}
 
-	async Task UpdateIsOnline()
+	/// <summary>Logs an unexpected failure and tells the user.</summary>
+	public async ValueTask ProcessError(Exception exception, string where, CancellationToken cancellationToken = default)
 	{
-		try
+		await Logger.ProcessError(exception, where, cancellationToken);
-		{
+		Toast.AddException(exception);
-			var latestOnlineState = await Status.IsOnline();
-
-	//var latestOnlineState = Random.Shared.Next() % 2 == 0;
-			if (latestOnlineState != IsOnline)
-			{
-				IsOnline = latestOnlineState;
-				StateHasChanged();
-			}
-	// else
-	// {
-	// 	var pingIsOnline = await DataService.Ping();
-	// 	if (pingIsOnline != IsOnline)
-	// 	{
-	// 		IsOnline = pingIsOnline;
-	// 		StateHasChanged();
-	// 	}
-	// }
-		}
-		catch (Exception ex)
-		{
-			Logger.LogError(ex, $"{nameof(CascadingState)}.{nameof(UpdateIsOnline)}");
-		}
 	}
 
-	public async ValueTask ProcessError(Exception ex, string where)
+	public async ValueTask ProcessWarning(string message, string where, CancellationToken cancellationToken = default)
 	{
-		try
+		await Logger.ProcessWarning(message, where, cancellationToken);
-		{
+		Toast.AddWarning(message);
-			await DbStorage.AddLog(ex, where);
-			Logger.LogError(ex, where);
-			await Task.Run(() => {
-			});
-		}
-		catch (Exception exception)
-		{
-			Logger.LogError(exception, $"{nameof(CascadingState)}.{nameof(ProcessError)}");
-		}
 	}
 
-	public async ValueTask ProcessWarning(string message, string where)
+	public async ValueTask DisposeAsync()
 	{
-		try
+		await disposeCancellation.CancelAsync();
-		{
+		disposeCancellation.Dispose();
-			await DbStorage.AddLog(message, where);
+		onlineTimer?.Dispose();
-			Logger.LogWarning("{where} - {message}", where, message);
+		cascadingStateReference?.Dispose();
-			await Task.Run(() => {
-			});
-		}
-		catch (Exception exception)
-		{
-			Logger.LogError(exception, $"{nameof(CascadingState)}.{nameof(ProcessWarning)}");
-		}
 	}
 }

LayerComponents/LocalizableComponentBase.cs

@@ -1,12 +1,109 @@
-using collAnon.Client.Services;
+using collAnon.Client.Services;
+
+using decePubClient.Services;
+
 using Microsoft.AspNetCore.Components;
 
 namespace decePubClient.LayerComponents
 {
-	public class LocalizableComponentBase : ComponentBase
+	/// <summary>
+	/// Base of every page and app component (b2b.next's WidmannComponentBase). It gives them the cascading state, the
+	/// localizer, navigation and toasts, the loading flag and the disable rule, and the offline helpers: a page that
+	/// finds the app offline registers its fetch with WhenOnline, starts StartOnlinePolling and stops loading; the
+	/// job runs once when the app is back online.
+	/// </summary>
+	public class LocalizableComponentBase : ComponentBase, IAsyncDisposable
 	{
+		[CascadingParameter] protected CascadingState CascadingState { get; set; }
 		[Inject] public CoalescingStringLocalizer Localizer { get; set; }
-		protected List<Func<Task>> AfterRenderAsyncJobs = new();
+		[Inject] protected NavigationManager Navigation { get; set; }
+		[Inject] protected ToastService Toast { get; set; }
+
+		/// <summary>Work to run once after the next render, e.g. JS interop that needs the rendered DOM.</summary>
+		protected List<Func<Task>> AfterRenderAsyncJobs = [];
+
+		/// <summary>True until the component's first load completes; set it to false at the end of OnInitializedAsync.</summary>
 		protected bool IsLoading { get; set; } = true;
+
+		/// <summary>What every Disabled= binding starts from: loading, or no connection.</summary>
+		protected bool IsDefaultDisabled => IsLoading || CascadingState.IsOffline;
+
+		readonly List<Func<Task>> onOnlineJobs = [];
+		PeriodicTimer pollingTimer;
+		CancellationTokenSource pollingCancellation;
+		bool disposed;
+
+		protected override async Task OnAfterRenderAsync(bool firstRender)
+		{
+			if (AfterRenderAsyncJobs.Count == 0)
+				return;
+
+			var jobs = AfterRenderAsyncJobs.ToList();
+			AfterRenderAsyncJobs.Clear();
+			foreach (var job in jobs)
+				await job();
+		}
+
+		/// <summary>Runs the job once, the next time the app is online (needs StartOnlinePolling).</summary>
+		protected void WhenOnline(Func<Task> job) => onOnlineJobs.Add(job);
+
+		/// <summary>Checks every interval (10 seconds by default) whether the app is back online to run the WhenOnline jobs.</summary>
+		protected void StartOnlinePolling(TimeSpan? interval = null)
+		{
+			if (pollingTimer is not null)
+				return;
+
+			pollingCancellation = new();
+			pollingTimer = new(interval ?? TimeSpan.FromSeconds(10));
+			_ = PollOnline(pollingCancellation.Token);
+		}
+
+		async Task PollOnline(CancellationToken cancellationToken)
+		{
+			try
+			{
+				while (await pollingTimer.WaitForNextTickAsync(cancellationToken))
+				{
+					if (CascadingState.IsOffline || onOnlineJobs.Count == 0)
+						continue;
+
+					var jobs = onOnlineJobs.ToList();
+					onOnlineJobs.Clear();
+					foreach (var job in jobs)
+					{
+						try
+						{
+							await InvokeAsync(job);
+						}
+						catch (Exception ex)
+						{
+							await CascadingState.ProcessError(ex, $"{GetType().Name}.{nameof(PollOnline)}", cancellationToken);
+						}
+					}
+
+					await InvokeAsync(StateHasChanged);
+				}
+			}
+			catch (OperationCanceledException)
+			{
+			}
+		}
+
+		public virtual async ValueTask DisposeAsync()
+		{
+			if (disposed)
+				return;
+
+			disposed = true;
+			if (pollingCancellation is not null)
+			{
+				await pollingCancellation.CancelAsync();
+				pollingCancellation.Dispose();
+			}
+
+			pollingTimer?.Dispose();
+			onOnlineJobs.Clear();
+			GC.SuppressFinalize(this);
+		}
 	}
 }

Models/BoostingUser.cs

@@ -2,10 +2,10 @@
 {
 	public class BoostingUser
 	{
-		public string UserId { get; set; } = "45f14fa8-c40f-4121-997c-ef2542196a50";
+		public string UserId { get; set; }
-		public string UserName { get; set; } = "@loosy@letsrulethe.world";
+		public string UserName { get; set; }
-		public string DisplayName { get; set; } = "loosy";
+		public string DisplayName { get; set; }
-		public string PictureUrl { get; set; } = "https://letsrulethe.world/media/ddd91d51-dc12-4b82-86a2-2a28cc959183/L51ZAL4QEL07";
+		public string PictureUrl { get; set; }
-		public string ProfileUrl { get; set; } = "https://letsrulethe.world/users/loosy";
+		public string ProfileUrl { get; set; }
 	}
 }

Models/ClientLogs.cs

@@ -7,21 +7,19 @@
 		public string WarningMessage { get; set; }
 		public ClientLogException Exception { get; set; }
 		public DateTime TimeStamp { get; set; } = DateTime.Now;
+		/// <summary>The entry as HTML for a log viewer: the warning text, or the exception's details.</summary>
 		public string ErrorMessage()
 		{
-			if (Exception.InnerExceptionMessage != null)
+			if (Exception is null)
-			{
+				return WarningMessage;
-				return @$"<b>Type</b>: {Exception.Type ?? "N/A"} <b>HelpLink</b>: {Exception.HelpLink ?? "N/A"} <b>HResult</b>: {Exception.HResult ?? "N/A"}<br>
+
-<b>Source</b>: {Exception.Source ?? "N/A"} <b>StackTrace</b>: {Exception.StackTrace ?? "N/A"} <b>MemberName</b>: {Exception.TargetSiteName ?? "N/A"}<br>
+			var details = @$"<b>Type</b>: {Exception.Type ?? "N/A"} <b>HelpLink</b>: {Exception.HelpLink ?? "N/A"} <b>HResult</b>: {Exception.HResult ?? "N/A"}<br>
-<b>Message</b>: {Exception.Message ?? "N/A"}<br>
-<b>InnerExceptionMessage</b>:{Exception.InnerExceptionMessage ?? "N/A"}";
-			}
-			else
-			{
-				return @$"<b>Type</b>: {Exception.Type ?? "N/A"} <b>HelpLink</b>: {Exception.HelpLink ?? "N/A"} <b>HResult</b>: {Exception.HResult ?? "N/A"}<br>
 <b>Source</b>: {Exception.Source ?? "N/A"} <b>StackTrace</b>: {Exception.StackTrace ?? "N/A"} <b>MemberName</b>: {Exception.TargetSiteName ?? "N/A"}<br>
 <b>Message</b>: {Exception.Message ?? "N/A"}";
-			}
+			if (Exception.InnerExceptionMessage is null)
+				return details;
+
+			return $"{details}<br>\n<b>InnerExceptionMessage</b>:{Exception.InnerExceptionMessage}";
 		}
 	}
 

Models/FailureCodes.cs

@@ -0,0 +1,20 @@
+namespace decePubClient.Models;
+
+/// <summary>
+/// WebResult.ErrorCode values HttpService sets when a request fails before or outside the server, so the UI can tell a
+/// connectivity problem (shown as a warning) from a real error.
+/// </summary>
+public static class FailureCodes
+{
+	public const string Cancelled = "CANCELLED";
+	public const string DeviceOffline = "DEVICE-OFFLINE";
+	public const string Timeout = "TIMEOUT";
+	public const string ApiUnreachable = "API-UNREACHABLE";
+	public const string RetriesExhausted = "RETRIES-EXHAUSTED";
+	public const string ServerError = "SERVER-ERROR";
+	public const string ClientError = "CLIENT-ERROR";
+	public const string Unauthorized = "UNAUTHORIZED";
+
+	public static bool IsConnectivity(string errorCode) =>
+		errorCode is DeviceOffline or Timeout or ApiUnreachable or RetriesExhausted;
+}

Models/Media.cs

@@ -6,6 +6,6 @@
 		public string Url { get; set; }
 		public string ContentType { get; set; }
 		public string AltText { get; set; }
-		public byte[] Blob { get; set; } //TODO TEMPORARY
+		public byte[] Blob { get; set; } = []; //TODO TEMPORARY
 	}
 }

Models/Message.cs

@@ -16,7 +16,7 @@ namespace decePubClient.Models
 		public int BoostsCounter { get; set; } = 0;
 		public bool IsBoostedByCurrentUser { get; set; } = false;
 		public BoostingUser BoostingUser { get; set; }
-		public List<Media> Medias { get; set; } = new();
+		public List<Media> Medias { get; set; } = [];
 		public DateTime CreatedAt { get; set; }
 
 		[Bindable(false), JsonIgnore]

Models/MessageForm.cs

@@ -19,7 +19,7 @@ public class MessageForm
 	public string Title { get; set; }
 	[StringLength(5_000, ErrorMessageResourceName = ValidationNames.MaxLength, ErrorMessageResourceType = typeof(ErrorMessages))]
 	public string Content { get; set; }
-	public List<UploadMedia> Media { get; set; } = new();
+	public List<UploadMedia> Media { get; set; } = [];
 
 	[JsonIgnore, Bindable(false)]
 	public MediaType MediaType { get; set; } = MediaType.Images;

Models/MessageUser.cs

@@ -2,11 +2,11 @@
 {
 	public class MessageUser
 	{
-		public string UserId { get; set; } = "45f14fa8-c40f-4121-997c-ef2542196a50";
+		public string UserId { get; set; }
-		public string UserName { get; set; } = "@loosy@letsrulethe.world";
+		public string UserName { get; set; }
-		public string DisplayName { get; set; } = "loosy";
+		public string DisplayName { get; set; }
-		public string PictureUrl { get; set; } = "https://letsrulethe.world/media/ddd91d51-dc12-4b82-86a2-2a28cc959183/L51ZAL4QEL07";
+		public string PictureUrl { get; set; }
-		public string BackgroundUrl { get; set; } = "https://letsrulethe.world/media/9a3cc6c4-1018-4f41-86c7-f3e63e362bf4/EXM8RUK10B0Z";
+		public string BackgroundUrl { get; set; }
-		public string ProfileUrl { get; set; } = "https://letsrulethe.world/users/loosy";
+		public string ProfileUrl { get; set; }
 	}
 }

Models/PublicCacheData.cs

@@ -6,12 +6,12 @@ namespace decePubClient.Models
 {
 	public class PublicCacheData
 	{
-		public IReadOnlyList<ViewLanguage> Languages { get; set; } = new List<ViewLanguage>();
+		public IReadOnlyList<ViewLanguage> Languages { get; set; } = [];
-		public List<MediaDeviceInfo> QrCodeDevices { get; set; } = new();
+		public List<MediaDeviceInfo> QrCodeDevices { get; set; } = [];
 		public string LastPage { get; set; }
 		public string CurrentSubPage { get; set; }
 		public PageSettings PageSettings { get; set; } = new();
 		public bool ShowLogs { get; set; } = false;
-		public IReadOnlyDictionary<string, string> Policies { get; set; } = new ReadOnlyDictionary<string, string>(new Dictionary<string, string>());
+		public IReadOnlyDictionary<string, string> Policies { get; set; } = ReadOnlyDictionary<string, string>.Empty;
 	}
 }

Models/UploadMedia.cs

@@ -8,7 +8,7 @@ public class UploadMedia
 	public string ContentType { get; set; }
 	public string FileName { get; set; }
 	public string AltText { get; set; }
-	public byte[] Blob { get; set; }
+	public byte[] Blob { get; set; } = [];
 
 	[JsonIgnore, Bindable(false)]
 	public string Base64Preview { get; set; }

Models/User.cs

@@ -2,15 +2,34 @@
 {
 	public class User
 	{
-		public string Id { get; set; } = "45f14fa8-c40f-4121-997c-ef2542196a50";
+		public string Id { get; set; }
 		public bool IsAuthenticated { get; set; } = false;
-		public List<UserClaim> Claims { get; set; } = new();
+		public List<UserClaim> Claims { get; set; } = [];
 		
-		public string UserName { get; set; } = "@loosy@letsrulethe.world";
+		public string UserName { get; set; }
-		public string DisplayName { get; set; } = "loosy";
+		public string DisplayName { get; set; }
-		public string PictureUrl { get; set; } = "https://letsrulethe.world/media/ddd91d51-dc12-4b82-86a2-2a28cc959183/L51ZAL4QEL07";
+		public string PictureUrl { get; set; }
-		public string BackgroundUrl { get; set; } = "https://letsrulethe.world/media/9a3cc6c4-1018-4f41-86c7-f3e63e362bf4/EXM8RUK10B0Z";
+		public string BackgroundUrl { get; set; }
-		public string ProfileUrl { get; set; } = "https://letsrulethe.world/users/loosy";
+		public string ProfileUrl { get; set; }
+
+		public MessageUser ToMessageUser() => new()
+		{
+			UserId = Id,
+			UserName = UserName,
+			DisplayName = DisplayName,
+			PictureUrl = PictureUrl,
+			BackgroundUrl = BackgroundUrl,
+			ProfileUrl = ProfileUrl
+		};
+
+		public BoostingUser ToBoostingUser() => new()
+		{
+			UserId = Id,
+			UserName = UserName,
+			DisplayName = DisplayName,
+			PictureUrl = PictureUrl,
+			ProfileUrl = ProfileUrl
+		};
 	}
 
 	public class UserClaim

Models/ValidationErrors.cs

@@ -0,0 +1,11 @@
+namespace decePubClient.Models;
+
+/// <summary>ASP.NET Core's validation ProblemDetails, as the server returns it for an invalid request body.</summary>
+public class ValidationErrors
+{
+	public string Type { get; set; }
+	public string Title { get; set; }
+	public int Status { get; set; }
+	public Dictionary<string, string[]> Errors { get; set; } = [];
+	public string TraceId { get; set; }
+}

Pages/Administration.razor

@@ -177,5 +177,4 @@
 </section>
 
 @code {
-	[CascadingParameter] CascadingState CascadingState { get; set; }
 }

Pages/ExpandMessage.razor

@@ -14,7 +14,14 @@
 					@Localizer["loading"]
 				</p>
 			}
-
+			else if (IsNotFound)
+			{
+				<p class="w-full text-center text-lg">
+					<i class="ion-ios-remove-circle-outline"></i> @Localizer["This message doesn't exist."]
+				</p>
+			}
+			else
+			{
 				@foreach (var message in Ancestors)
 				{
 					<Content CssContainer="ml-6 w-auto" IncludeExpand="false" Message="message"
@@ -38,6 +45,7 @@
 							 OnMessageMediaDownload="async (m) => await OnMessageMediaDownload(m)"
 							 OnUserBlock="async (u) => await OnUserBlock(u)" OnUserDirectMessage="async (u) => await OnUserDirectMessage(u)" OnUserSilence="async (u) => await OnUserSilence(u)" />
 				}
+			}
 
 		</div>
 	</section>
@@ -45,146 +53,137 @@
 </div>
 
 @code {
-	[CascadingParameter] CascadingState CascadingState { get; set; }
-	[Inject] NavigationManager Navigation { get; set; }
 	[Inject] IStorage DbStorage { get; set; }
 	[Inject] ILocalStorageService LocalStorage { get; set; }
 	[Inject] IBlazorDownloadFileService BlazorDownloadFileService { get; set; }
 	[Inject] MessagesService MessagesService { get; set; }
 	[Parameter] public string MessageId { get; set; }
 
-	List<Message> Ancestors { get; set; } = new();
+	List<Message> Ancestors { get; set; } = [];
 	Message CurrentMessage { get; set; } = new();
-	List<Message> Descendants { get; set; } = new();
+	List<Message> Descendants { get; set; } = [];
-
+	bool IsNotFound { get; set; }
 	TimeSortingType TimeSortingType { get; set; } = TimeSortingType.Ascending;
 
-	protected override async Task OnInitializedAsync()
+	// Parameters rather than initialization: following a link to another message reuses this page.
+	protected override async Task OnParametersSetAsync()
 	{
-		if (MessageId is { Length: 0 })
+		if (string.IsNullOrEmpty(MessageId))
 		{
-			Navigation.NavigateTo("/");
+			Navigation.NavigateTo("");
 			return;
 		}
 
-		var filters = await LocalStorage.GetItemAsync<ActionBarFilter>(nameof(ActionBarFilter));
+		IsLoading = true;
-		if (filters == default)
+		var filters = await LocalStorage.GetItemAsync<ActionBarFilter>(nameof(ActionBarFilter)) ?? new();
-			await LocalStorage.SetItemAsync(nameof(ActionBarFilter), new ActionBarFilter());
-		else
 		TimeSortingType = filters.TimeSortingType;
 
-		CurrentMessage = await DbStorage.GetMessage(MessageId);
+		if (CascadingState.IsOffline)
-
-		Ancestors = new List<Message>
 		{
-			new()
+			WhenOnline(LoadData);
-			{
+			StartOnlinePolling();
-				RootMessageId = default,
+			IsLoading = false;
-				MessageId = "51C698E3-7C28-4C90-9212-48D5C81DE089",
+			return;
-				User = Faker.GetRandomUser(),
-				MessageType = (MessageType)Random.Shared.Next(0, 4),
-				Title = CurrentMessage?.Title,
-				Content = "<p>esempio di messaggio <b>precedente</b> a quello espanso</p>",
-				Medias = new(),
-				CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-				IsFavourite = Random.Shared.Next() % 2 == 0,
-				BoostsCounter = Random.Shared.Next(0,100),
-				IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
 		}
-		};
 
-		Descendants = new List<Message>
+		await LoadData();
-		{
-			new()
-			{
-				RootMessageId = default,
-				MessageId = "0569A1DF-46FC-4485-9F11-F8CDFB794404",
-				User = Faker.GetRandomUser(),
-				MessageType = (MessageType)Random.Shared.Next(0, 4),
-				Title = CurrentMessage?.Title,
-				Content = "<p>esempio di messaggio <b>successivo</b> a quello espanso</p>",
-				Medias = new(),
-				CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-				IsFavourite = Random.Shared.Next() % 2 == 0,
-				BoostsCounter = Random.Shared.Next(0,100),
-				IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
-			}
-		};
 		IsLoading = false;
 	}
 
-	void OnTimeSortingChanged(TimeSortingType timeSortingType)
+	// The thread: the message from IndexedDB, the ones around it mock (Faker) until the app reads PrivaPub's context.
+	async Task LoadData()
 	{
-		TimeSortingType = timeSortingType;
+		var message = await DbStorage.GetMessage(MessageId);
+		IsNotFound = message is null;
+		if (IsNotFound)
+			return;
+
+		CurrentMessage = message;
+		(Ancestors, Descendants) = Faker.Thread(message);
 	}
 
 	async Task OnMessageReply(MessageForm messageForm)
 	{
-		var replyMessage = await MessagesService.SubmitMessage(messageForm);
+		var result = await MessagesService.SubmitMessage(messageForm, CascadingState.User);
-		Descendants.Add(new()
+		if (result.IsInvalid)
 		{
-				MessageId = Guid.NewGuid().ToString(),
+			Toast.AddResponseError(result);
-				Content = messageForm.Content?.ParseContent(messageForm.ContentType),
+			return;
-				CreatedAt = DateTime.UtcNow,
-				MessageType = messageForm.MessageType,
-				Medias = messageForm.Media.Select(m => new Media
-				{
-					FileName = m.FileName,
-					AltText = m.AltText,
-					ContentType = m.ContentType,
-					Url = m.Base64Preview,
-					Blob = m.Blob
-				}).ToList(),
-				Title = messageForm.Title,
-				User = new MessageUser
-				{
-					UserId = CascadingState.User.Id,
-					UserName = CascadingState.User.UserName,
-					DisplayName = CascadingState.User.DisplayName,
-					PictureUrl = CascadingState.User.PictureUrl,
-					ProfileUrl = CascadingState.User.ProfileUrl,
-					BackgroundUrl = CascadingState.User.BackgroundUrl
-				},
-			});
 		}
 
-	async ValueTask OnMessageBoost(Message message)
+		Descendants.Add(result.Data as Message);
-	{
-		if (message.IsBoostedByCurrentUser) return;
-		var boostedMessage = await MessagesService.BoostUnboostMessage(message);
-		message.BoostsCounter += 1;
-
-		//Add to the home page in the background
 	}
 
-	async ValueTask OnMessageFavourite(Message message)
+	async Task OnMessageBoost(Message message)
 	{
-		var favouriteMessage = await MessagesService.FavouriteUnfavouriteMessage(message);
+		if (message.IsBoostedByCurrentUser)
-		message.IsFavourite = !message.IsFavourite;
+			return;
+
+		var result = await MessagesService.BoostUnboostMessage(message);
+		if (result.IsInvalid)
+			Toast.AddResponseError(result);
 	}
 
-	async ValueTask OnMessageDelete(Message message)
+	async Task OnMessageFavourite(Message message)
 	{
-		var deleteResult = await MessagesService.DeleteMessage(message);
+		var result = await MessagesService.FavouriteUnfavouriteMessage(message);
+		if (result.IsInvalid)
+			Toast.AddResponseError(result);
 	}
 
-	async ValueTask OnMessageMediaDownload(Media media)
+	async Task OnMessageDelete(Message message)
+	{
+		var result = await MessagesService.DeleteMessage(message);
+		if (result.IsInvalid)
+		{
+			Toast.AddResponseError(result);
+			return;
+		}
+
+		Toast.AddResponseSuccess(Localizer["Message deleted."]);
+		if (message == CurrentMessage)
+		{
+			Navigation.NavigateTo("");
+			return;
+		}
+
+		Ancestors.Remove(message);
+		Descendants.Remove(message);
+	}
+
+	async Task OnMessageMediaDownload(Media media)
 	{
 		await BlazorDownloadFileService.DownloadFileAsync(media.FileName, media.Blob, media.ContentType);
 	}
 
-	async ValueTask OnUserBlock(MessageUser messageUser)
+	async Task OnUserBlock(MessageUser messageUser)
 	{
-		var blockResult = await MessagesService.BlockUserFromMessage(messageUser);
+		var result = await MessagesService.BlockUserFromMessage(messageUser);
+		if (result.IsInvalid)
+		{
+			Toast.AddResponseError(result);
+			return;
 		}
 
-	async ValueTask OnUserDirectMessage(Message message)
+		Toast.AddResponseSuccess(Localizer["{0} blocked.", messageUser.DisplayName]);
-	{
-		var directMessage = await MessagesService.ReplyMessage(message, MessageType.Direct);
 	}
 
-	async ValueTask OnUserSilence(MessageUser messageUser)
+	async Task OnUserDirectMessage(Message message)
 	{
-		var silenceResult = await MessagesService.SilenceUserFromMessage(messageUser);
+		var result = await MessagesService.ReplyMessage(message, MessageType.Direct);
+		if (result.IsInvalid)
+			Toast.AddResponseError(result);
+	}
+
+	async Task OnUserSilence(MessageUser messageUser)
+	{
+		var result = await MessagesService.SilenceUserFromMessage(messageUser);
+		if (result.IsInvalid)
+		{
+			Toast.AddResponseError(result);
+			return;
+		}
+
+		Toast.AddResponseSuccess(Localizer["{0} muted.", messageUser.DisplayName]);
 	}
 }

Pages/Index.razor

@@ -27,7 +27,7 @@
 			{
 				<Content Message="message"
 							 OnMessageBoost="async (m) => await OnMessageBoost(m)" OnMessageDelete="async (m) => await OnMessageDelete(m)"
-							 OnMessageFavourite="async (m) => await OnMessageFavourite(m)" OnMessageReply="async (m) => await OnMessageReply(m)"
+							 OnMessageFavourite="async (m) => await OnMessageFavourite(m)" OnMessageReply="async (m) => await OnMessageSubmit(m)"
 							 OnMessageMediaDownload="async (m) => await OnMessageMediaDownload(m)"
 							 OnUserBlock="async (u) => await OnUserBlock(u)" OnUserDirectMessage="async (u) => await OnUserDirectMessage(u)" OnUserSilence="async (u) => await OnUserSilence(u)" />
 			}
@@ -58,55 +58,39 @@
 </div>
 
 @code {
-	[CascadingParameter] Task<AuthenticationState> AuthState { get; set; }
-	[CascadingParameter] CascadingState CascadingState { get; set; }
 	[Inject] IBlazorDownloadFileService BlazorDownloadFileService { get; set; }
 	[Inject] IStorage Storage { get; set; }
 	[Inject] ILocalStorageService LocalStorage { get; set; }
-	[Inject] HttpClient Http { get; set; }
 	[Inject] MessagesService MessagesService { get; set; }
 
 	TimelineType TimelineType { get; set; } = TimelineType.Home;
 	TimeSortingType TimeSortingType { get; set; } = TimeSortingType.Ascending;
-
+	List<Message> Messages { get; set; } = [];
-	IReadOnlyList<Claim> userClaim
-	{
-		get
-		{
-			var auth = AuthState.Result;
-			if (auth.User.Identity?.IsAuthenticated ?? false)
-				return auth.User.Claims.ToList();
-			return new List<Claim>();
-		}
-	}
-
-	List<Message> IncomingMessages { get; set; } = new();
-	List<Message> Messages { get; set; } = new();
-	string Response { get; set; }
 
 	protected override async Task OnInitializedAsync()
 	{
-		var filters = await LocalStorage.GetItemAsync<ActionBarFilter>(nameof(ActionBarFilter));
+		var filters = await LocalStorage.GetItemAsync<ActionBarFilter>(nameof(ActionBarFilter)) ?? new();
-		if (filters == default)
-			await LocalStorage.SetItemAsync(nameof(ActionBarFilter), new ActionBarFilter());
-		else
-		{
 		TimelineType = filters.TimelineType;
 		TimeSortingType = filters.TimeSortingType;
+
+		if (CascadingState.IsOffline)
+		{
+			WhenOnline(LoadData);
+			StartOnlinePolling();
+			IsLoading = false;
+			return;
 		}
 
-		Messages = await Storage.GetMessages();
+		await LoadData();
-		//try
-		//{
-		//	var response = await Http.GetAsync("api/test");
-		//	Response = await response.Content.ReadAsStringAsync();
-		//}
-		//catch
-		//{
-		//}
 		IsLoading = false;
 	}
 
+	// The feed: the mock one in IndexedDB until the app reads PrivaPub's timeline.
+	async Task LoadData()
+	{
+		Messages = await Storage.GetMessages();
+	}
+
 	void OnTimelineChanged(TimelineType timelineType)
 	{
 		TimelineType = timelineType;
@@ -117,90 +101,38 @@
 		TimeSortingType = timeSortingType;
 	}
 
+	// Covers replies too: the form carries the RootMessageId.
 	async Task OnMessageSubmit(MessageForm messageForm)
 	{
-		await Task.Run(() =>
+		var result = await MessagesService.SubmitMessage(messageForm, CascadingState.User);
+		if (result.IsInvalid)
 		{
-		});
+			Toast.AddResponseError(result);
-		var submitMessage = await MessagesService.SubmitMessage(messageForm);
+			return;
-		Messages.Insert(0, new()
-			{
-				MessageId = Guid.NewGuid().ToString(),
-				Content = messageForm.Content?.ParseContent(messageForm.ContentType),
-				CreatedAt = DateTime.UtcNow,
-				MessageType = messageForm.MessageType,
-				Medias = messageForm.Media.Select(m => new Media
-				{
-					FileName = m.FileName,
-					AltText = m.AltText,
-					ContentType = m.ContentType,
-					Url = m.Base64Preview,
-					Blob = m.Blob
-				}).ToList(),
-				Title = messageForm.Title,
-				User = new MessageUser
-				{
-					UserId = CascadingState.User.Id,
-					UserName = CascadingState.User.UserName,
-					DisplayName = CascadingState.User.DisplayName,
-					PictureUrl = CascadingState.User.PictureUrl,
-					ProfileUrl = CascadingState.User.ProfileUrl,
-					BackgroundUrl = CascadingState.User.BackgroundUrl
-				},
-			});
 		}
 
-	async Task OnMessageReply(MessageForm messageForm)
+		Messages.Insert(0, result.Data as Message);
-	{
-		await Task.Run(() =>
-		{
-		});
-		var replyMessage = await MessagesService.SubmitMessage(messageForm);
-		Messages.Insert(0, new()
-			{
-				RootMessageId = messageForm.RootMessageId,
-				MessageId = Guid.NewGuid().ToString(),
-				Content = messageForm.Content?.ParseContent(messageForm.ContentType),
-				CreatedAt = DateTime.UtcNow,
-				MessageType = messageForm.MessageType,
-				Medias = messageForm.Media.Select(m => new Media
-				{
-					FileName = m.FileName,
-					AltText = m.AltText,
-					ContentType = m.ContentType,
-					Url = m.Base64Preview,
-					Blob = m.Blob
-				}).ToList(),
-				Title = messageForm.Title,
-				User = new MessageUser
-				{
-					UserId = CascadingState.User.Id,
-					UserName = CascadingState.User.UserName,
-					DisplayName = CascadingState.User.DisplayName,
-					PictureUrl = CascadingState.User.PictureUrl,
-					ProfileUrl = CascadingState.User.ProfileUrl,
-					BackgroundUrl = CascadingState.User.BackgroundUrl
-				}
-			});
 	}
 
-	async ValueTask OnMessageBoost(Message message)
+	async Task OnMessageBoost(Message message)
 	{
-		var boostedMessageTemp = await MessagesService.BoostUnboostMessage(message);
+		var result = await MessagesService.BoostUnboostMessage(message);
-		message.BoostsCounter = message.IsBoostedByCurrentUser ? message.BoostsCounter - 1 : message.BoostsCounter + 1;
+		if (result.IsInvalid)
-		message.IsBoostedByCurrentUser = !message.IsBoostedByCurrentUser;
-		if (message.IsBoostedByCurrentUser)
 		{
-			var boostedMessage = new Message
+			Toast.AddResponseError(result);
+			return;
+		}
+
+		if (!message.IsBoostedByCurrentUser)
 		{
-					BoostingUser = new()
+			Messages.RemoveAll(m => m.MessageId == message.MessageId && m.BoostingUser?.UserId == CascadingState.User.Id);
+			return;
+		}
+
+		// The feed shows a boost as a copy of the message carrying the booster.
+		Messages.Insert(0, new()
 		{
-						UserId = CascadingState.User.Id,
+			BoostingUser = CascadingState.User.ToBoostingUser(),
-						DisplayName = CascadingState.User.DisplayName,
-						PictureUrl = CascadingState.User.PictureUrl,
-						ProfileUrl = CascadingState.User.ProfileUrl,
-						UserName = CascadingState.User.UserName
-					},
 			BoostsCounter = message.BoostsCounter,
 			Content = message.Content,
 			CreatedAt = message.CreatedAt,
@@ -212,48 +144,62 @@
 			RootMessageId = message.RootMessageId,
 			Title = message.Title,
 			User = message.User
-				};
-			Messages.Insert(0, boostedMessage);
-		}
-		else
-		{
-			Messages.RemoveAll(m => m.MessageId == message.MessageId && m.BoostingUser != null && m.BoostingUser.UserId == CascadingState.User.Id);
-		}
-	}
-
-	async ValueTask OnMessageFavourite(Message message)
-	{
-		message.IsFavourite = !message.IsFavourite;
-		var favouriteMessage = await MessagesService.FavouriteUnfavouriteMessage(message);
-	}
-
-	async ValueTask OnMessageDelete(Message message)
-	{
-		Messages.Remove(message);
-		var deleteResult = await MessagesService.DeleteMessage(message);
-	}
-
-	async ValueTask OnMessageMediaDownload(Media media)
-	{
-		await Task.Run(() =>
-		{
 		});
+	}
+
+	async Task OnMessageFavourite(Message message)
+	{
+		var result = await MessagesService.FavouriteUnfavouriteMessage(message);
+		if (result.IsInvalid)
+			Toast.AddResponseError(result);
+	}
+
+	async Task OnMessageDelete(Message message)
+	{
+		var result = await MessagesService.DeleteMessage(message);
+		if (result.IsInvalid)
+		{
+			Toast.AddResponseError(result);
+			return;
+		}
+
+		Messages.Remove(message);
+		Toast.AddResponseSuccess(Localizer["Message deleted."]);
+	}
+
+	async Task OnMessageMediaDownload(Media media)
+	{
 		await BlazorDownloadFileService.DownloadFileAsync(media.FileName, media.Blob, media.ContentType);
 	}
 
-	async ValueTask OnUserBlock(MessageUser messageUser)
+	async Task OnUserBlock(MessageUser messageUser)
 	{
-		var blockResult = await MessagesService.BlockUserFromMessage(messageUser);
+		var result = await MessagesService.BlockUserFromMessage(messageUser);
+		if (result.IsInvalid)
+		{
+			Toast.AddResponseError(result);
+			return;
 		}
 
-	async ValueTask OnUserDirectMessage(Message message)
+		Toast.AddResponseSuccess(Localizer["{0} blocked.", messageUser.DisplayName]);
-	{
-		var directMessage = await MessagesService.ReplyMessage(message, MessageType.Direct);
 	}
 
-	async ValueTask OnUserSilence(MessageUser messageUser)
+	async Task OnUserDirectMessage(Message message)
 	{
-		var silenceResult = await MessagesService.SilenceUserFromMessage(messageUser);
+		var result = await MessagesService.ReplyMessage(message, MessageType.Direct);
+		if (result.IsInvalid)
+			Toast.AddResponseError(result);
 	}
 
+	async Task OnUserSilence(MessageUser messageUser)
+	{
+		var result = await MessagesService.SilenceUserFromMessage(messageUser);
+		if (result.IsInvalid)
+		{
+			Toast.AddResponseError(result);
+			return;
+		}
+
+		Toast.AddResponseSuccess(Localizer["{0} muted.", messageUser.DisplayName]);
+	}
 }

Pages/Login.razor

@@ -11,6 +11,5 @@
 </section>
 
 @code {
-	[CascadingParameter] CascadingState CascadingState { get; set; }
 
 }

Pages/Logout.razor

@@ -11,9 +11,7 @@
 </section>
 
 @code {
-	[CascadingParameter] CascadingState CascadingState { get; set; }
 	[Inject] TokenAuthStateProvider AuthStateProvider { get; set; }
-	[Inject] NavigationManager Navigation { get; set; }
 
 	// The app signs in with its own token (TokenAuthStateProvider), so signing out clears that token and the local
 	// database. The template's authentication/logout route can't do it: RemoteAuthenticatorView needs the OIDC

Pages/Settings.razor

@@ -15,23 +15,32 @@
 			<ChildContent>
 				@* Every theme setting; NavMenu's toggle and slider are shortcuts to the dark and hue ones. *@
 				<div class="flex flex-col gap-4 w-full p-3 md:p-4">
-					<DToggle LabelText="@Localizer["Follow the system's light or dark setting"]" Value="Theme.PreferSystemTheming"
+					<DToggle LabelText="@Localizer["Follow the system's light or dark setting"]" Value="CascadingState.PublicCacheData.PageSettings.PreferSystemTheming"
-							 ValueChanged="v => Update(s => s.PreferSystemTheming = v)" ValueExpression="() => Theme.PreferSystemTheming" />
+							 ValueChanged="v => Update(s => s.PreferSystemTheming = v)" ValueExpression="() => CascadingState.PublicCacheData.PageSettings.PreferSystemTheming" />
 					<DToggle LabelText="@Localizer["Dark mode"]" Value="IsDark"
 							 ValueChanged="v => Update(s => s.SetDarkMode(v))" ValueExpression="() => IsDark" />
 					<DToggle LabelText="@Localizer["Grey"]" Value="IsGray"
 							 ValueChanged="v => Update(s => s.SetGray(v, IsDark))" ValueExpression="() => IsGray" />
+					<label class="flex flex-col gap-2 max-w-md">
+						<span class="text-sm">@Localizer["Language"]</span>
+						@* Language names stay in their own language. Changing it reloads the app with the new culture. *@
+						<DSelect TValue="string" class="w-full" Value="CascadingState.PublicCacheData.PageSettings.CurrentLanguageCode"
+								 ValueChanged="ChangeLanguage" ValueExpression="() => CascadingState.PublicCacheData.PageSettings.CurrentLanguageCode">
+							<option value="en">English</option>
+							<option value="it">Italiano</option>
+						</DSelect>
+					</label>
 					<label class="flex flex-col gap-2 max-w-md">
 						<span class="text-sm">@Localizer["Light theme colour"]</span>
 						<DRange TValue="short" class="neo-hue-track w-full" Size="DSize.Xs" Min="0" Max="359" Step="1"
-								Value="Theme.LightThemeIndexColour" ValueChanged="v => Update(s => s.SetHue(false, v))"
+								Value="CascadingState.PublicCacheData.PageSettings.LightThemeIndexColour" ValueChanged="v => Update(s => s.SetHue(false, v))"
-								ValueExpression="() => Theme.LightThemeIndexColour" />
+								ValueExpression="() => CascadingState.PublicCacheData.PageSettings.LightThemeIndexColour" />
 					</label>
 					<label class="flex flex-col gap-2 max-w-md">
 						<span class="text-sm">@Localizer["Dark theme colour"]</span>
 						<DRange TValue="short" class="neo-hue-track w-full" Size="DSize.Xs" Min="0" Max="359" Step="1"
-								Value="Theme.DarkThemeIndexColour" ValueChanged="v => Update(s => s.SetHue(true, v))"
+								Value="CascadingState.PublicCacheData.PageSettings.DarkThemeIndexColour" ValueChanged="v => Update(s => s.SetHue(true, v))"
-								ValueExpression="() => Theme.DarkThemeIndexColour" />
+								ValueExpression="() => CascadingState.PublicCacheData.PageSettings.DarkThemeIndexColour" />
 					</label>
 				</div>
 			</ChildContent>
@@ -87,11 +96,15 @@
 </section>
 
 @code {
-	[CascadingParameter] CascadingState CascadingState { get; set; }
 
-	PageSettings Theme => CascadingState.PublicCacheData?.PageSettings ?? new();
 	bool IsDark => CascadingState.Status.IsDarkTheme();
-	bool IsGray => Theme.IsGray();
+	bool IsGray => CascadingState.PublicCacheData.PageSettings.IsGray();
 
 	Task Update(Action<PageSettings> change) => CascadingState.UpdatePageSettings(change).AsTask();
+
+	async Task ChangeLanguage(string languageCode)
+	{
+		await Update(settings => settings.CurrentLanguageCode = languageCode);
+		Navigation.NavigateTo(Navigation.Uri, forceLoad: true);
+	}
 }

Program.cs

@@ -1,9 +1,10 @@
-using decePubClient;
+using decePubClient;
 using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
 using System.Net.Http.Headers;
 using System.Text.Json;
 using Blazored.LocalStorage;
 using decePubClient.Extensions;
+using decePubClient.Helpers;
 using decePubClient.Models;
 using decePubClient.Services;
 using Toolbelt.Blazor.Extensions.DependencyInjection;
@@ -39,12 +40,15 @@ builder.Services.AddOptions()
 		config.JsonSerializerOptions.IgnoreReadOnlyProperties = true;
 		config.JsonSerializerOptions.ReadCommentHandling = JsonCommentHandling.Skip;
 		config.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
+		config.JsonSerializerOptions.TypeInfoResolver = SUtility.DefaultSerializer.TypeInfoResolver;
 	})
 	.AddScoped<TokenAuthStateProvider>()
 	.AddScoped<MessagesService>()
 	.AddScoped<AuthenticationStateProvider>(provider => provider.GetRequiredService<TokenAuthStateProvider>())
+	.AddScoped<ILoggingService, LoggingService>()
+	.AddScoped<ToastService>()
 	.AddSingleton(typeof(CoalescingStringLocalizer))
-	//.AddTransient<IHttpService, HttpService>()
+	.AddTransient<IHttpService, HttpService>()
 	.AddHeadElementHelper(options => options.DisableClientScriptAutoInjection = true)
 	.AddLocalization()
 	.AddTransient<IStorage, Storage>()

Services/AppStatusService.cs

@@ -4,20 +4,12 @@ using Microsoft.JSInterop;
 
 namespace decePubClient.Services;
 
-public class AppStatusService
+public class AppStatusService(IJSRuntime jsRuntime)
 {
-		readonly IJSRuntime JsRuntime;
+		readonly IJSInProcessRuntime JsSyncRuntime = (IJSInProcessRuntime)jsRuntime;
-		readonly IJSInProcessRuntime JsSyncRuntime;
 
-		public AppStatusService(IJSRuntime JSRuntime)
+		public async ValueTask<bool> IsOnline(CancellationToken cancellationToken = default) =>
-		{
+			await jsRuntime.InvokeAsync<bool>("isOnline", cancellationToken);
-			JsRuntime = JSRuntime;
-			JsSyncRuntime = (IJSInProcessRuntime)JSRuntime;
-		}
-
-		public async ValueTask<bool> IsOnline() => await JsSyncRuntime.InvokeAsync<bool>("isOnline");
-
-		public bool InputCaptureSupported() => JsSyncRuntime.Invoke<bool>("inputCaptureSupported");
 
 		public bool IsServiceWorkerAvailable() => JsSyncRuntime.Invoke<bool>("isServiceWorkerAvailable");
 
@@ -31,15 +23,11 @@ public class AppStatusService
 
 		public void ClearAppBadge() => JsSyncRuntime.InvokeVoid("clearAppBadge");
 
-		public async ValueTask ClearCache()
+		public async ValueTask ClearCache(CancellationToken cancellationToken = default) =>
-		{
+			await jsRuntime.InvokeVoidAsync("clearCache", cancellationToken);
-			await JsRuntime.InvokeVoidAsync("clearCache");
-		}
 
-		public async ValueTask ClearLocalStorage()
+		public async ValueTask ClearLocalStorage(CancellationToken cancellationToken = default) =>
-		{
+			await jsRuntime.InvokeVoidAsync("clearLocalStorage", cancellationToken);
-			await JsRuntime.InvokeVoidAsync("clearLocalStorage");
-		}
 
 		public void ReloadPage()
 		{
@@ -55,7 +43,9 @@ public class AppStatusService
 
 		public bool CanShare() => JsSyncRuntime.Invoke<bool>("canShareStuff");
 
-		public async ValueTask ShareTextUrl(string title, string text, Uri uri) => await JsRuntime.InvokeVoidAsync("shareTextUrl", title, text, uri.ToString());
+		public async ValueTask ShareTextUrl(string title, string text, Uri uri, CancellationToken cancellationToken = default) =>
+			await jsRuntime.InvokeVoidAsync("shareTextUrl", cancellationToken, title, text, uri.ToString());
 
-		public async ValueTask ShareText(string title, string text) => await JsRuntime.InvokeVoidAsync("shareText", title, text);
+		public async ValueTask ShareText(string title, string text, CancellationToken cancellationToken = default) =>
+			await jsRuntime.InvokeVoidAsync("shareText", cancellationToken, title, text);
 }

Services/CoalescingStringLocalizer.cs

@@ -6,50 +6,59 @@ using PrivaPub.ClientModels.Resources;
 
 namespace collAnon.Client.Services
 {
-	public sealed class CoalescingStringLocalizer
+	/// <summary>
+	/// The app's localizer: looks a key up in Resources/AllStrings, then in PrivaPub.ClientModels' FieldsNameResource and
+	/// ErrorsResource, and falls back to the key itself (formatted with the arguments), so a missing key shows its
+	/// English text instead of failing.
+	/// </summary>
+	public sealed class CoalescingStringLocalizer(IStringLocalizer<AllStrings> baseLocalizer, IStringLocalizer<FieldsNameResource> fieldsLocalizer,
+		IStringLocalizer<ErrorsResource> errorsLocalizer)
 	{
-		public readonly IStringLocalizer<AllStrings> _pLocalizer;
+		public IStringLocalizer Base => baseLocalizer;
-		readonly IStringLocalizer<FieldsNameResource> _fLocalizer;
+		public IStringLocalizer Fields => fieldsLocalizer;
-		readonly IStringLocalizer<ErrorsResource> _eLocalizer;
+		public IStringLocalizer Errors => errorsLocalizer;
 
-		public CoalescingStringLocalizer(
+		public LocalizedString this[string name]
-		IStringLocalizer<AllStrings> pLocalizer,
-		IStringLocalizer<FieldsNameResource> fLocalizer,
-		IStringLocalizer<ErrorsResource> eLocalizer) =>
-			(_pLocalizer, _fLocalizer, _eLocalizer) =
-			(pLocalizer, fLocalizer, eLocalizer);
-
-		internal LocalizedString this[string name]
 		{
 			get
 			{
-				if (_pLocalizer[name].ResourceNotFound)
+				try
-					if (_fLocalizer[name].ResourceNotFound)
+				{
-						if (_eLocalizer[name].ResourceNotFound)
+					if (!baseLocalizer[name].ResourceNotFound)
-							return new(name, name, false);
+						return baseLocalizer[name];
-						else
+					if (!fieldsLocalizer[name].ResourceNotFound)
-							return _eLocalizer[name];
+						return fieldsLocalizer[name];
-					else
+					if (!errorsLocalizer[name].ResourceNotFound)
-						return _fLocalizer[name];
+						return errorsLocalizer[name];
-				else
+					return new(name, name, true);
-					return _pLocalizer[name];
+				}
+				catch (Exception ex)
+				{
+					Console.WriteLine(ex.ToString());
+					return new(name, name, true);
+				}
 			}
 		}
 
-		internal LocalizedString this[string name, params object[] arguments]
+		public LocalizedString this[string name, params object[] arguments]
 		{
 			get
 			{
-				if (_pLocalizer[name].ResourceNotFound)
+				try
-					if (_fLocalizer[name].ResourceNotFound)
+				{
-						if (_eLocalizer[name].ResourceNotFound)
+					if (!baseLocalizer[name].ResourceNotFound)
-							return new(name, name, false);
+						return baseLocalizer[name, arguments];
-						else
+					if (!fieldsLocalizer[name].ResourceNotFound)
-							return _eLocalizer[name, arguments];
+						return fieldsLocalizer[name, arguments];
-					else
+					if (!errorsLocalizer[name].ResourceNotFound)
-						return _fLocalizer[name, arguments];
+						return errorsLocalizer[name, arguments];
-				else
+					return new(name, string.Format(name, arguments), true);
-					return _pLocalizer[name, arguments];
+				}
+				catch (Exception ex)
+				{
+					Console.WriteLine(ex.ToString());
+					return new(name, name, true);
+				}
 			}
 		}
 	}

Services/IHttpService.cs

@@ -1,196 +1,217 @@
-using Blazored.LocalStorage;
-using System.Globalization;
-using System.Net.Http.Json;
 using System.Net;
+using System.Net.Http.Json;
+
+using collAnon.Client.Services;
+
+using decePubClient.Helpers;
 using decePubClient.Models;
 
 namespace decePubClient.Services
 {
+	/// <summary>
+	/// Requests to the PrivaPub API through the "default" HttpClient (AppConfiguration.ApiBaseAddress), at three
+	/// authentication levels: Get/Post/Delete need a valid token and sign out on 401, *Anon add the token when there is
+	/// one, *TotallyAnon never send it. Nothing throws: a failure comes back as a response carrying an invalid WebResult
+	/// (SUtility.ClassifiedFailure, read with ExtensionMethods.ReadWebResult), a cancelled request as HTTP 410.
+	/// With retryOnError, 408/429/502/503/504 and transport errors are retried after 1, 2, 4, 8, 16 and 29 seconds, then
+	/// every 60, plus jitter, for at most 10 minutes.
+	/// </summary>
 	public interface IHttpService
 	{
-		Task<HttpResponseMessage> Get(string uri, object payload = default, string[] queryParams = default);
+		Task<HttpResponseMessage> Get(string uri, string[] queryParams = default, bool retryOnError = false, CancellationToken cancellationToken = default);
 
-		Task<HttpResponseMessage> GetAnon(string uri, object payload = default, string[] queryParams = default);
+		Task<HttpResponseMessage> GetAnon(string uri, string[] queryParams = default, bool retryOnError = false, CancellationToken cancellationToken = default);
 
-		Task<HttpResponseMessage> Post(string uri, object payload = default);
+		Task<HttpResponseMessage> GetTotallyAnon(string uri, string[] queryParams = default, bool retryOnError = false,
+			CancellationToken cancellationToken = default);
 
-		Task<HttpResponseMessage> PostAnon(string uri, object payload = default);
+		Task<HttpResponseMessage> Post(string uri, object payload = default, bool retryOnError = false, CancellationToken cancellationToken = default);
 
-		Task<HttpResponseMessage> Delete(string uri, string[] queryParams = default, object payload = default);
+		Task<HttpResponseMessage> PostAnon(string uri, object payload = default, bool retryOnError = false, CancellationToken cancellationToken = default);
+
+		Task<HttpResponseMessage> PostTotallyAnon(string uri, object payload = default, bool retryOnError = false,
+			CancellationToken cancellationToken = default);
+
+		Task<HttpResponseMessage> Delete(string uri, string[] queryParams = default, object payload = default, bool retryOnError = false,
+			CancellationToken cancellationToken = default);
+
+		Task<HttpResponseMessage> DeleteTotallyAnon(string uri, string[] queryParams = default, object payload = default, bool retryOnError = false,
+			CancellationToken cancellationToken = default);
 	}
 
-	public class HttpService : IHttpService
+	public class HttpService(IHttpClientFactory httpClientFactory, TokenAuthStateProvider authStateProvider, AppStatusService statusService,
+		ILoggingService logger, CoalescingStringLocalizer localizer) : IHttpService
 	{
-		readonly IHttpClientFactory HttpClientFactory;
+		static readonly int[] RetryRampUpDelaysMs = [1_000, 2_000, 4_000, 8_000, 16_000, 29_000];
-		readonly TokenAuthStateProvider AuthStateProvider;
+		const int RetryIndefiniteDelayMs = 60_000;
-		readonly ILogger<HttpService> Logger;
+		static readonly TimeSpan RetryDeadline = TimeSpan.FromMinutes(10);
-		readonly ILocalStorageService Storage;
+		static readonly int[] RetryableStatusCodes = [408, 429, 502, 503, 504];
-		readonly IStorage DbStorage;
 
-		public HttpService(
+		readonly HttpClient httpClient = httpClientFactory.CreateClient("default");
-						IHttpClientFactory httpClientFactory,
-						TokenAuthStateProvider authStateProvider,
-						ILogger<HttpService> logger,
-						ILocalStorageService storage,
-						IStorage dbStorage)
-		{
-			HttpClientFactory = httpClientFactory;
-			AuthStateProvider = authStateProvider;
-			Logger = logger;
-			Storage = storage;
-			DbStorage = dbStorage;
-		}
 
-		public async Task<HttpResponseMessage> Get(string uri, object payload = default, string[] queryParams = default)
+		public Task<HttpResponseMessage> Get(string uri, string[] queryParams = default, bool retryOnError = false, CancellationToken cancellationToken = default) =>
+			Send(nameof(Get), () => BuildRequest(HttpMethod.Get, uri, queryParams: queryParams), SendAuthRequest, retryOnError, cancellationToken);
+
+		public Task<HttpResponseMessage> GetAnon(string uri, string[] queryParams = default, bool retryOnError = false, CancellationToken cancellationToken = default) =>
+			Send(nameof(GetAnon), () => BuildRequest(HttpMethod.Get, uri, queryParams: queryParams), SendAuthIfAvailableRequest, retryOnError,
+				cancellationToken);
+
+		public Task<HttpResponseMessage> GetTotallyAnon(string uri, string[] queryParams = default, bool retryOnError = false,
+			CancellationToken cancellationToken = default) =>
+			Send(nameof(GetTotallyAnon), () => BuildRequest(HttpMethod.Get, uri, queryParams: queryParams), httpClient.SendAsync, retryOnError,
+				cancellationToken);
+
+		public Task<HttpResponseMessage> Post(string uri, object payload = default, bool retryOnError = false, CancellationToken cancellationToken = default) =>
+			Send(nameof(Post), () => BuildRequest(HttpMethod.Post, uri, payload, forceContent: true), SendAuthRequest, retryOnError, cancellationToken);
+
+		public Task<HttpResponseMessage> PostAnon(string uri, object payload = default, bool retryOnError = false, CancellationToken cancellationToken = default) =>
+			Send(nameof(PostAnon), () => BuildRequest(HttpMethod.Post, uri, payload, forceContent: true), SendAuthIfAvailableRequest, retryOnError,
+				cancellationToken);
+
+		public Task<HttpResponseMessage> PostTotallyAnon(string uri, object payload = default, bool retryOnError = false,
+			CancellationToken cancellationToken = default) =>
+			Send(nameof(PostTotallyAnon), () => BuildRequest(HttpMethod.Post, uri, payload, forceContent: true), httpClient.SendAsync, retryOnError,
+				cancellationToken);
+
+		public Task<HttpResponseMessage> Delete(string uri, string[] queryParams = default, object payload = default, bool retryOnError = false,
+			CancellationToken cancellationToken = default) =>
+			Send(nameof(Delete), () => BuildRequest(HttpMethod.Delete, uri, payload, queryParams), SendAuthRequest, retryOnError, cancellationToken);
+
+		public Task<HttpResponseMessage> DeleteTotallyAnon(string uri, string[] queryParams = default, object payload = default, bool retryOnError = false,
+			CancellationToken cancellationToken = default) =>
+			Send(nameof(DeleteTotallyAnon), () => BuildRequest(HttpMethod.Delete, uri, payload, queryParams), httpClient.SendAsync, retryOnError,
+				cancellationToken);
+
+		async Task<HttpResponseMessage> Send(string caller, Func<HttpRequestMessage> requestFactory,
+			Func<HttpRequestMessage, CancellationToken, Task<HttpResponseMessage>> send, bool retryOnError, CancellationToken cancellationToken)
 		{
+			var deadline = DateTime.UtcNow + RetryDeadline;
+			var attempt = 0;
+			while (true)
+			{
+				// A request message can be sent once, so every attempt builds its own.
+				var request = requestFactory();
+				var where = $"{nameof(HttpService)}.{caller}:{request.RequestUri?.OriginalString}";
+				var failure = default(string);
+				var transportException = default(Exception);
 				try
 				{
-				uri = $"{CultureInfo.DefaultThreadCurrentCulture.TwoLetterISOLanguageName}/{uri}";
+					var response = await send(request, cancellationToken);
-				var request = default(HttpRequestMessage);
+					var status = (int)response.StatusCode;
-				if (queryParams != null)
+					if (!retryOnError || !RetryableStatusCodes.Contains(status))
-					request = new(HttpMethod.Get, string.Join('?', uri, string.Join('&', queryParams)));
+						return status > 499 ? ServerError(response) : response;
-				else
+
-					request = new(HttpMethod.Get, uri);
+					failure = $"HTTP {status}";
-				if (payload != null)
+					response.Dispose();
-					request.Content = JsonContent.Create(payload);
+				}
-				return await SendRequest(request);
+				catch (Exception) when (cancellationToken.IsCancellationRequested)
+				{
+					return SUtility.DefaultTaskCancelled();
+				}
+				catch (Exception ex) when (ex is HttpRequestException or TaskCanceledException)
+				{
+					if (!retryOnError)
+					{
+						await logger.ProcessError(ex, where, cancellationToken);
+						return await DescribeUnreachable(ex, 1, cancellationToken);
+					}
+
+					failure = ex.Message;
+					transportException = ex;
 				}
 				catch (Exception ex)
 				{
-				Logger.LogError(ex, $"{nameof(Get)}:{uri}");
+					await logger.ProcessError(ex, where, cancellationToken);
-				await DbStorage.AddLog(ex, $"{nameof(Get)}:{uri}");
+					return SUtility.ClassifiedFailure(FailureCodes.ClientError,
-				return new(HttpStatusCode.ServiceUnavailable);
+						localizer["The request could not be prepared. Reload the page and try again."], HttpStatusCode.ServiceUnavailable);
-			}
 				}
 
-		public async Task<HttpResponseMessage> Post(string uri, object payload = default)
+				var delay = attempt < RetryRampUpDelaysMs.Length ? RetryRampUpDelaysMs[attempt] : RetryIndefiniteDelayMs;
+				delay += Random.Shared.Next(0, delay / 4);
+				if (deadline - DateTime.UtcNow <= TimeSpan.FromMilliseconds(delay))
 				{
+					await logger.ProcessError($"Gave up after {attempt + 1} attempts. {failure}", where, cancellationToken);
+					if (transportException is not null)
+						return await DescribeUnreachable(transportException, attempt + 1, cancellationToken);
+					return SUtility.ClassifiedFailure(FailureCodes.RetriesExhausted,
+						localizer["The server is still not answering after {0} attempts. Try again later.", attempt + 1], HttpStatusCode.ServiceUnavailable);
+				}
+
+				await logger.ProcessWarning($"Attempt {attempt + 1} failed, retrying in {delay}ms. {failure}", where, cancellationToken);
 				try
 				{
-				uri = $"{CultureInfo.DefaultThreadCurrentCulture.TwoLetterISOLanguageName}/{uri}";
+					await Task.Delay(delay, cancellationToken);
-				var request = new HttpRequestMessage(HttpMethod.Post, uri)
-				{
-					Content = JsonContent.Create(payload)
-				};
-				return await SendRequest(request);
 				}
-			catch (Exception ex)
+				catch (OperationCanceledException)
 				{
-				Logger.LogError(ex, $"{nameof(Post)}:{uri}");
+					return SUtility.DefaultTaskCancelled();
-				await DbStorage.AddLog(ex, $"{nameof(Post)}:{uri}");
+				}
-				return new(HttpStatusCode.ServiceUnavailable);
+
+				attempt++;
 			}
 		}
 
-		public async Task<HttpResponseMessage> GetAnon(string uri, object payload = default, string[] queryParams = default)
+		HttpResponseMessage ServerError(HttpResponseMessage response)
 		{
-			try
+			var status = response.StatusCode;
-			{
+			response.Dispose();
-				uri = $"{CultureInfo.DefaultThreadCurrentCulture.TwoLetterISOLanguageName}/{uri}";
+			return SUtility.ClassifiedFailure(FailureCodes.ServerError, localizer["The server reported an internal error (HTTP {0}).", (int)status], status);
-				var request = default(HttpRequestMessage);
-				if (queryParams != null)
-					request = new(HttpMethod.Get, string.Join('?', uri, string.Join('&', queryParams)));
-				else
-					request = new(HttpMethod.Get, uri);
-				if (payload != null)
-					request.Content = JsonContent.Create(payload);
-				return await SendAnonRequest(request);
-			}
-			catch (Exception ex)
-			{
-				Logger.LogError(ex, $"{nameof(GetAnon)}:{uri}");
-				await DbStorage.AddLog(ex, $"{nameof(GetAnon)}:{uri}");
-				return new(HttpStatusCode.ServiceUnavailable);
-			}
 		}
 
-		public async Task<HttpResponseMessage> PostAnon(string uri, object payload = default)
+		/// <summary>Why a request got no answer: the device is offline, it timed out, retries ran out, or the server is unreachable.</summary>
+		async Task<HttpResponseMessage> DescribeUnreachable(Exception exception, int attempts, CancellationToken cancellationToken)
 		{
-			try
+			if (!await statusService.IsOnline(cancellationToken))
-			{
+				return SUtility.ClassifiedFailure(FailureCodes.DeviceOffline,
-				uri = $"{CultureInfo.DefaultThreadCurrentCulture.TwoLetterISOLanguageName}/{uri}";
+					localizer["This device is offline. Check the connection and try again."], HttpStatusCode.ServiceUnavailable);
-				var request = new HttpRequestMessage(HttpMethod.Post, uri)
+
-				{
+			if (exception is TaskCanceledException { InnerException: TimeoutException })
-					Content = JsonContent.Create(payload)
+				return SUtility.ClassifiedFailure(FailureCodes.Timeout,
-				};
+					localizer["The server took too long to answer. Try again later."], HttpStatusCode.ServiceUnavailable);
-				return await SendAnonRequest(request);
+
-			}
+			if (attempts > 1)
-			catch (Exception ex)
+				return SUtility.ClassifiedFailure(FailureCodes.RetriesExhausted,
-			{
+					localizer["The server is still not answering after {0} attempts. Try again later.", attempts], HttpStatusCode.ServiceUnavailable);
-				Logger.LogError(ex, $"{nameof(PostAnon)}:{uri}");
+
-				await DbStorage.AddLog(ex, $"{nameof(PostAnon)}:{uri}");
+			return SUtility.ClassifiedFailure(FailureCodes.ApiUnreachable,
-				return new(HttpStatusCode.ServiceUnavailable);
+				localizer["The server can't be reached. Try again later."], HttpStatusCode.ServiceUnavailable);
-			}
 		}
 
-		public async Task<HttpResponseMessage> Delete(string uri, string[] queryParams = default, object payload = default)
+		async Task<HttpResponseMessage> SendAuthRequest(HttpRequestMessage request, CancellationToken cancellationToken)
 		{
-			try
+			var token = await authStateProvider.GetToken(cancellationToken);
+			if (token is null)
 			{
-				uri = $"{CultureInfo.DefaultThreadCurrentCulture.TwoLetterISOLanguageName}/{uri}";
+				logger.Process($"NO_TOKEN:{request.RequestUri?.OriginalString}", nameof(SendAuthRequest), LogLevel.Warning);
-				var request = default(HttpRequestMessage);
+				return SUtility.DefaultUnauthorized(localizer["Your session has expired. Sign in again."]);
-				if (queryParams != null)
-					request = new(HttpMethod.Delete, string.Join('?', uri, string.Join('&', queryParams)));
-				else
-					request = new(HttpMethod.Delete, uri);
-				if (payload != null)
-					request.Content = JsonContent.Create(payload);
-				return await SendRequest(request);
-			}
-			catch (Exception ex)
-			{
-				Logger.LogError(ex, $"{nameof(Delete)}:{uri}");
-				await DbStorage.AddLog(ex, $"{nameof(Delete)}:{uri}");
-				return new(HttpStatusCode.ServiceUnavailable);
-			}
-		}
-
-		// helper methods
-		async Task<HttpResponseMessage> SendRequest(HttpRequestMessage request)
-		{
-			try
-			{
-				var authData = await Storage.GetItemAsync<AuthData>(nameof(AuthData));
-				var isApiUrl = !request.RequestUri?.IsAbsoluteUri;
-				if (isApiUrl.HasValue && isApiUrl.Value)
-					request.Headers.Authorization = new("Bearer", authData.Token);
-
-				var response = await HttpClientFactory.CreateClient().SendAsync(request);
-				if (response.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
-				{
-					Logger.LogWarning($"{nameof(SendRequest)}:401/403:{request.RequestUri?.OriginalString}:{await response.Content.ReadAsStringAsync()}");
-					await DbStorage.AddLog($"{nameof(SendRequest)}:401/403:{request.RequestUri?.OriginalString}:{await response.Content.ReadAsStringAsync()}", $"{nameof(SendRequest)}:{request.RequestUri?.OriginalString}");
-					await AuthStateProvider.LogoutAsync();
 			}
 
+			request.Headers.Authorization = new("Bearer", token);
+			var response = await httpClient.SendAsync(request, cancellationToken);
+			if (response.StatusCode is not HttpStatusCode.Unauthorized)
 				return response;
-			}
+
-			catch (Exception ex)
+			response.Dispose();
-			{
+			await authStateProvider.LogoutAsync(cancellationToken: cancellationToken);
-				Logger.LogError(ex, $"{nameof(SendRequest)}:{request.RequestUri?.OriginalString}");
+			return SUtility.DefaultUnauthorized(localizer["Your session has expired. Sign in again."]);
-				await DbStorage.AddLog(ex, $"{nameof(SendRequest)}:{request.RequestUri?.OriginalString}");
-				return new(HttpStatusCode.ServiceUnavailable);
-			}
 		}
 
-		async Task<HttpResponseMessage> SendAnonRequest(HttpRequestMessage request)
+		async Task<HttpResponseMessage> SendAuthIfAvailableRequest(HttpRequestMessage request, CancellationToken cancellationToken)
 		{
-			try
+			var token = await authStateProvider.GetToken(cancellationToken);
-			{
+			if (token is not null)
-				var authData = await Storage.GetItemAsync<AuthData>(nameof(AuthData));
+				request.Headers.Authorization = new("Bearer", token);
-				if (!string.IsNullOrEmpty(authData?.Token))
+			return await httpClient.SendAsync(request, cancellationToken);
-					request.Headers.Authorization = new("Bearer", authData.Token);
-
-				var response = await HttpClientFactory.CreateClient().SendAsync(request);
-
-				return response;
 		}
-			catch (Exception ex)
+
+		static HttpRequestMessage BuildRequest(HttpMethod method, string uri, object payload = default, string[] queryParams = default,
+			bool forceContent = false)
 		{
-				Logger.LogError(ex, $"{nameof(SendAnonRequest)}:{request.RequestUri?.OriginalString}");
+			var target = queryParams is { Length: > 0 } ? $"{uri}?{string.Join('&', queryParams)}" : uri;
-				await DbStorage.AddLog(ex, $"{nameof(SendAnonRequest)}:{request.RequestUri?.OriginalString}");
+			var request = new HttpRequestMessage(method, target);
-				return new(HttpStatusCode.ServiceUnavailable);
+			if (payload is not null || forceContent)
-			}
+				request.Content = JsonContent.Create(payload, payload?.GetType() ?? typeof(object), options: SUtility.DefaultSerializer);
+			return request;
 		}
 	}
 }

Services/ILoggingService.cs

@@ -0,0 +1,61 @@
+namespace decePubClient.Services;
+
+public interface ILoggingService
+{
+	ValueTask ProcessError(Exception exception, string where, CancellationToken cancellationToken = default);
+
+	ValueTask ProcessError(string message, string where, CancellationToken cancellationToken = default);
+
+	ValueTask ProcessWarning(string message, string where, CancellationToken cancellationToken = default);
+
+	void Process(string message, string where = default, LogLevel level = LogLevel.Information);
+}
+
+/// <summary>
+/// Writes to the browser console through ILogger and keeps errors and warnings in the IndexedDB client log, so they
+/// survive a reload. Never throws: logging must not break the code that is reporting a failure.
+/// </summary>
+public class LoggingService(IStorage storage, ILogger<LoggingService> logger) : ILoggingService
+{
+	public void Process(string message, string where = default, LogLevel level = LogLevel.Information) =>
+		logger.Log(level, "[{Where}] {Message}", where ?? "N/A", message);
+
+	public async ValueTask ProcessError(Exception exception, string where, CancellationToken cancellationToken = default)
+	{
+		try
+		{
+			logger.LogError(exception, "[{Where}]", where);
+			await storage.AddLog(exception, where, cancellationToken);
+		}
+		catch (Exception ex)
+		{
+			logger.LogError(ex, $"{nameof(LoggingService)}.{nameof(ProcessError)}");
+		}
+	}
+
+	public async ValueTask ProcessError(string message, string where, CancellationToken cancellationToken = default)
+	{
+		try
+		{
+			logger.LogError("[{Where}] {Message}", where, message);
+			await storage.AddLog(message, where, cancellationToken);
+		}
+		catch (Exception ex)
+		{
+			logger.LogError(ex, $"{nameof(LoggingService)}.{nameof(ProcessError)}");
+		}
+	}
+
+	public async ValueTask ProcessWarning(string message, string where, CancellationToken cancellationToken = default)
+	{
+		try
+		{
+			logger.LogWarning("[{Where}] {Message}", where, message);
+			await storage.AddLog(message, where, cancellationToken);
+		}
+		catch (Exception ex)
+		{
+			logger.LogError(ex, $"{nameof(LoggingService)}.{nameof(ProcessWarning)}");
+		}
+	}
+}

Services/IStorage.cs

@@ -1,316 +1,115 @@
-using decePubClient.Helpers;
+using decePubClient.Helpers;
 using decePubClient.Models;
-using decePubClient.Models.Types;
+
-using Markdig;
+using PrivaPub.ClientModels;
 
 namespace decePubClient.Services
 {
+	/// <summary>
+	/// The IndexedDB database "data" (schema in GenericExtensions.AddIndexedDb): messages and the client log. Lists
+	/// come back empty on failure, mutations as an invalid WebResult; nothing throws. Failures are logged with ILogger
+	/// only, because ILoggingService writes its log through this class.
+	/// </summary>
 	public interface IStorage
 	{
-		ValueTask<List<Message>> GetMessages();
+		Task<List<Message>> GetMessages(CancellationToken cancellationToken = default);
-		ValueTask<Message> GetMessage(string messageId);
-		ValueTask<string> AddMessages(List<Message> messages);
-		ValueTask<string> UpdateMessages(List<Message> messages);
-		ValueTask<string> RemoveMessage(string messageId);
 
-		ValueTask<ICollection<ClientLogs>> GetClientLogs();
+		Task<Message> GetMessage(string messageId, CancellationToken cancellationToken = default);
-		ValueTask AddLog(Exception exception, string where);
-		ValueTask AddLog(string message, string where);
 
-		ValueTask<bool> RemoveAll(bool includeClientLogs = false);
+		Task<WebResult> AddMessages(List<Message> messages, CancellationToken cancellationToken = default);
+
+		Task<WebResult> UpdateMessages(List<Message> messages, CancellationToken cancellationToken = default);
+
+		Task<WebResult> RemoveMessage(string messageId, CancellationToken cancellationToken = default);
+
+		Task<List<ClientLogs>> GetClientLogs(CancellationToken cancellationToken = default);
+
+		Task AddLog(Exception exception, string where, CancellationToken cancellationToken = default);
+
+		Task AddLog(string message, string where, CancellationToken cancellationToken = default);
+
+		Task<WebResult> RemoveAll(bool includeClientLogs = false, CancellationToken cancellationToken = default);
 	}
 
-	public class Storage : IStorage
+	public class Storage(IndexedDb db, ILogger<Storage> logger) : IStorage
 	{
-		readonly IndexedDb _db;
+		/// <summary>The client log keeps at most this many entries; past it the oldest half is dropped.</summary>
-		readonly ILogger<Storage> _logger;
+		const int MaxLogs = 100;
 
-		public Storage(IndexedDb indexedDb, ILogger<Storage> logger)
+		#region Messages
+
+		public async Task<Message> GetMessage(string messageId, CancellationToken cancellationToken = default)
 		{
-			_db = indexedDb;
+			try
-			_logger = logger;
-		}
-
-		#region Messagges
-
-		public async ValueTask<Message> GetMessage(string messageId)
 			{
-			await _db.OpenIndexedDb();
+				cancellationToken.ThrowIfCancellationRequested();
-			var message = await _db.GetByKey<string, Message>(nameof(Message), messageId);
+				await db.OpenIndexedDb();
+				var message = await db.GetByKey<string, Message>(nameof(Message), messageId);
+				if (message is not null)
+					return message;
 
-			if (message is null)
+				var messages = await GetMessages(cancellationToken);
-			{
-				var messages = await GetMessages();
 				return messages.FirstOrDefault(m => m.MessageId == messageId);
 			}
-
+			catch (Exception ex)
-			return message;
+			{
+				logger.LogError(ex, $"{nameof(Storage)}.{nameof(GetMessage)}");
+				return default;
+			}
 		}
 
-		public async ValueTask<List<Message>> GetMessages()
+		/// <summary>The stored messages, newest first; while none are stored, the mock feed (Faker.SeedMessages).</summary>
+		public async Task<List<Message>> GetMessages(CancellationToken cancellationToken = default)
 		{
-			await _db.OpenIndexedDb();
+			try
-			var messages = await _db.GetAll<Message>(nameof(Message)) ?? new();
+			{
-
+				cancellationToken.ThrowIfCancellationRequested();
-
+				await db.OpenIndexedDb();
+				var messages = await db.GetAll<Message>(nameof(Message)) ?? [];
 				if (messages.Count == 0)
-			{
+					messages = Faker.SeedMessages();
-				messages.Add(new()
+
-				{
+				return [.. messages.OrderByDescending(m => m.CreatedAt)];
-					RootMessageId = default,
-					MessageId = "992167EE-8947-4823-B1E2-B4E1019B6974",
-					User = Faker.GetRandomUser(),
-					MessageType = (MessageType)Random.Shared.Next(0, 4),
-					Title = default,
-					Content = "test di messaggio normale senza titolo",
-					Medias = new(),
-					CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-					IsFavourite = Random.Shared.Next() % 2 == 0,
-					BoostsCounter = Random.Shared.Next(0, 100),
-					IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
-				});
-				messages.Add(new()
-				{
-					RootMessageId = default,
-					MessageId = "C5307644-4EA8-4B5F-A240-7CFE4DE34741",
-					User = Faker.GetRandomUser(),
-					MessageType = (MessageType)Random.Shared.Next(0, 4),
-					Title = "sopra la panca la capra canta",
-					Content = Markdown.ToHtml("test di messaggio con titolo"),
-					Medias = new(),
-					CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-					IsFavourite = Random.Shared.Next() % 2 == 0,
-					BoostsCounter = Random.Shared.Next(0, 100),
-					IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
-				});
-				messages.Add(new()
-				{
-					RootMessageId = default,
-					MessageId = "E473D562-D210-4453-93DA-157D4B90B0D8",
-					User = Faker.GetRandomUser(),
-					MessageType = (MessageType)Random.Shared.Next(0, 4),
-					Title = default,
-					Content = "dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd test di messaggio con overflow del testo",
-					Medias = new(),
-					CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-					IsFavourite = Random.Shared.Next() % 2 == 0,
-					BoostsCounter = Random.Shared.Next(0, 100),
-					IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
-				});
-				messages.Add(new()
-				{
-					RootMessageId = default,
-					MessageId = "adf89dc6-0484-430e-a7c9-fcb1179b0c28",
-					User = Faker.GetRandomUser(),
-					MessageType = (MessageType)Random.Shared.Next(0, 4),
-					Title = default,
-					Content = "test video",
-					Medias = new()
-					{
-						new()
-						{
-							FileName = "8252d175e714db88beb8ee0349dbac90405d3d5148e96e0cfd7de3b0876dbb1b.mp4",
-							Url = "https://ihatebeinga.live/media/8252d175e714db88beb8ee0349dbac90405d3d5148e96e0cfd7de3b0876dbb1b.mp4",
-							AltText = "https://ihatebeinga.live/media/8252d175e714db88beb8ee0349dbac90405d3d5148e96e0cfd7de3b0876dbb1b.mp4",
-							ContentType = "video/mp4"
 			}
-					},
+			catch (Exception ex)
-					CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-					IsFavourite = Random.Shared.Next() % 2 == 0,
-					BoostsCounter = Random.Shared.Next(0, 100),
-					IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
-				});
-				messages.Add(new()
 			{
-					RootMessageId = default,
+				logger.LogError(ex, $"{nameof(Storage)}.{nameof(GetMessages)}");
-					MessageId = "96025b43-5235-44e9-a3fa-98df31edfbfb",
+				return [];
-					User = Faker.GetRandomUser(),
-					MessageType = (MessageType)Random.Shared.Next(0, 4),
-					Title = default,
-					Content = "test immagine",
-					Medias = new()
-					{
-						new()
-						{
-							FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							ContentType = "image/jpg"
 			}
-					},
-					CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-					IsFavourite = Random.Shared.Next() % 2 == 0,
-					BoostsCounter = Random.Shared.Next(0, 100),
-					IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
-				});
-				messages.Add(new()
-				{
-					RootMessageId = default,
-					MessageId = "277ca76b-aaad-4aa6-95fb-25f59e2fddf9",
-					User = Faker.GetRandomUser(),
-					MessageType = (MessageType)Random.Shared.Next(0, 4),
-					Title = default,
-					Content = "test audio",
-					Medias = new()
-					{
-						new()
-						{
-							FileName = "09bfb06d0096975f.mp3",
-							Url = "https://cdn.masto.host/mastodonuno/media_attachments/files/107/798/288/501/917/857/original/09bfb06d0096975f.mp3",
-							AltText = "09bfb06d0096975f.mp3",
-							ContentType = "audio/mp3"
-						}
-					},
-					CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-					IsFavourite = Random.Shared.Next() % 2 == 0,
-					BoostsCounter = Random.Shared.Next(0, 100),
-					IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
-				});
-				messages.Add(new()
-				{
-					BoostingUser = Faker.GetRandomBoostingUser(),
-					RootMessageId = default,
-					MessageId = "de64e520-a7d3-4f31-b5a9-ba236f3b146c",
-					User = Faker.GetRandomUser(),
-					MessageType = (MessageType)Random.Shared.Next(0, 4),
-					Title = default,
-					Content = "test immagini",
-					Medias = new()
-					{
-						new()
-						{
-							FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							ContentType = "image/jpg"
-						},
-						new()
-						{
-							FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							ContentType = "image/jpg"
-						},
-						new()
-						{
-							FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							ContentType = "image/jpg"
-						}
-					},
-					CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-					IsFavourite = Random.Shared.Next() % 2 == 0,
-					BoostsCounter = Random.Shared.Next(0,100),
-					IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
-				});
-				messages.Add(new()
-				{
-					RootMessageId = default,
-					MessageId = "de64e520-a7d3-4f31-b5a9-ba236f3b146c",
-					User = Faker.GetRandomUser(),
-					MessageType = (MessageType)Random.Shared.Next(0, 4),
-					Title = default,
-					Content = "test immagini",
-					Medias = new()
-					{
-						new()
-						{
-							FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							ContentType = "image/jpg"
-						},
-						new()
-						{
-							FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							ContentType = "image/jpg"
-						},
-						new()
-						{
-							FileName = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							Url = "https://ihatebeinga.live/media/51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							AltText = "51a7cf620f1dd096ac5867d5b78f8c71d57a23972b31c64ec124a8c41e77a618.jpg",
-							ContentType = "image/jpg"
-						}
-					},
-					CreatedAt = DateTime.UtcNow.AddMinutes(Random.Shared.Next(-5000, 0)),
-					IsFavourite = Random.Shared.Next() % 2 == 0,
-					BoostsCounter = Random.Shared.Next(0,100),
-					IsBoostedByCurrentUser = Random.Shared.Next() % 2 == 0,
-				});
 		}
 
-			messages = messages.OrderByDescending(m => m.CreatedAt).ToList();
+		public Task<WebResult> AddMessages(List<Message> messages, CancellationToken cancellationToken = default) =>
+			Run(nameof(AddMessages), async () => await db.AddItems(nameof(Message), messages), cancellationToken);
 
-			return messages;
+		public Task<WebResult> UpdateMessages(List<Message> messages, CancellationToken cancellationToken = default) =>
-		}
+			Run(nameof(UpdateMessages), async () => await db.UpdateItems(nameof(Message), messages), cancellationToken);
 
-		public async ValueTask<string> AddMessages(List<Message> messages)
+		public Task<WebResult> RemoveMessage(string messageId, CancellationToken cancellationToken = default) =>
-		{
+			Run(nameof(RemoveMessage), async () => await db.DeleteByKey(nameof(Message), messageId), cancellationToken);
-			await _db.OpenIndexedDb();
-			var result = await _db.AddItems(nameof(Message), messages);
-			_logger.LogInformation(result);
-			return result;
-		}
-
-		public async ValueTask<string> UpdateMessages(List<Message> messages)
-		{
-			await _db.OpenIndexedDb();
-			var result = await _db.UpdateItems(nameof(Message), messages);
-			_logger.LogInformation(result);
-			return result;
-
-		}
-
-		public async ValueTask<string> RemoveMessage(string messageId)
-		{
-			await _db.OpenIndexedDb();
-			var result = await _db.DeleteByKey(nameof(Message), messageId);
-			_logger.LogInformation(result);
-			return result;
-		}
 
 		#endregion
 
 		#region Logs
 
-		public async ValueTask<ICollection<ClientLogs>> GetClientLogs()
+		public async Task<List<ClientLogs>> GetClientLogs(CancellationToken cancellationToken = default)
 		{
 			try
 			{
-				_logger.LogInformation($"opening on {nameof(GetClientLogs)}");
+				cancellationToken.ThrowIfCancellationRequested();
-				await _db.OpenIndexedDb();
+				await db.OpenIndexedDb();
-				return (await _db.GetAll<ClientLogs>(nameof(ClientLogs))).OrderByDescending(cl => cl.TimeStamp).ToArray();
+				var logs = await db.GetAll<ClientLogs>(nameof(ClientLogs)) ?? [];
+				return [.. logs.OrderByDescending(log => log.TimeStamp)];
 			}
 			catch (Exception ex)
 			{
-				_logger.LogError(ex, ex.Message);
+				logger.LogError(ex, $"{nameof(Storage)}.{nameof(GetClientLogs)}");
-				return new List<ClientLogs>();
+				return [];
 			}
 		}
 
-		public async ValueTask AddLog(Exception exception, string where)
+		public Task AddLog(Exception exception, string where, CancellationToken cancellationToken = default) =>
+			AddLog(new ClientLogs
 			{
-			try
-			{
-				await _db.OpenIndexedDb();
-
-				var maxKey = await _db.GetMaxKey<long>(nameof(ClientLogs));
-				var minKey = await _db.GetMinKey<long>(nameof(ClientLogs));
-
-				if (minKey - maxKey <= -100)
-					for (var i = minKey; i < minKey + 50; i++)
-						_ = await _db.DeleteByKey(nameof(ClientLogs), i);
-
-				maxKey += 1;
-				var result = await _db.AddItems<ClientLogs>(nameof(ClientLogs), new()
-				{
-					new()
-					{
-						Id = maxKey,
 				Where = where,
 				Exception = new()
 				{
@@ -323,67 +122,66 @@ namespace decePubClient.Services
 					StackTrace = exception.StackTrace,
 					TargetSiteName = exception.TargetSite?.Name
 				}
-					}
+			}, cancellationToken);
-				});
-				_logger.LogDebug($"{nameof(AddLog)}() add logs result = {result}");
-			}
-			catch (Exception ex)
-			{
-				_logger.LogError(ex, ex.Message);
-			}
-		}
 
-		public async ValueTask AddLog(string message, string where)
+		public Task AddLog(string message, string where, CancellationToken cancellationToken = default) =>
+			AddLog(new ClientLogs { Where = where, WarningMessage = message }, cancellationToken);
+
+		/// <summary>Numbers the entry after the newest one and trims the log; never throws.</summary>
+		async Task AddLog(ClientLogs log, CancellationToken cancellationToken)
 		{
 			try
 			{
-				await _db.OpenIndexedDb();
+				cancellationToken.ThrowIfCancellationRequested();
+				await db.OpenIndexedDb();
 
-				var maxKey = await _db.GetMaxKey<long>(nameof(ClientLogs));
+				var maxKey = await db.GetMaxKey<long>(nameof(ClientLogs));
-				var minKey = await _db.GetMinKey<long>(nameof(ClientLogs));
+				var minKey = await db.GetMinKey<long>(nameof(ClientLogs));
+				if (maxKey - minKey >= MaxLogs)
+					for (var key = minKey; key < minKey + MaxLogs / 2; key++)
+						_ = await db.DeleteByKey(nameof(ClientLogs), key);
 
-				if (minKey - maxKey <= -100)
+				log.Id = maxKey + 1;
-					for (var i = minKey; i < minKey + 50; i++)
+				var result = await db.AddItems<ClientLogs>(nameof(ClientLogs), [log]);
-						_ = await _db.DeleteByKey(nameof(ClientLogs), i);
+				logger.LogDebug($"{nameof(AddLog)}() add logs result = {result}");
-
-				maxKey += 1;
-				var result = await _db.AddItems<ClientLogs>(nameof(ClientLogs), new()
-				{
-					new()
-					{
-						Id = maxKey,
-						Where = where,
-						Exception = null,
-						WarningMessage = message
-					}
-				});
 			}
 			catch (Exception ex)
 			{
-				_logger.LogError(ex, ex.Message);
+				logger.LogError(ex, $"{nameof(Storage)}.{nameof(AddLog)}");
 			}
 		}
 
 		#endregion
 
-		public async ValueTask<bool> RemoveAll(bool includeClientLogs = false)
+		public Task<WebResult> RemoveAll(bool includeClientLogs = false, CancellationToken cancellationToken = default) =>
+			Run(nameof(RemoveAll), async () =>
 			{
+				var result = await db.DeleteAll(nameof(Message));
+				if (includeClientLogs)
+					result = await db.DeleteAll(nameof(ClientLogs));
+				return result;
+			}, cancellationToken);
+
+		/// <summary>Runs a write and turns its outcome into a WebResult.</summary>
+		async Task<WebResult> Run(string caller, Func<Task<string>> write, CancellationToken cancellationToken)
+		{
+			var result = new WebResult();
 			try
 			{
-				_logger.LogInformation($"opening on {nameof(RemoveAll)}");
+				cancellationToken.ThrowIfCancellationRequested();
-				await _db.OpenIndexedDb();
+				await db.OpenIndexedDb();
-				_ = await _db.DeleteAll(nameof(Message));
+				logger.LogInformation("{Caller}: {Result}", caller, await write());
-				if (includeClientLogs)
+				return result;
-					_ = await _db.DeleteAll(nameof(ClientLogs));
+			}
-
+			catch (OperationCanceledException)
-				return true;
+			{
+				return SUtility.DefaultTaskCancelledResult;
 			}
 			catch (Exception ex)
 			{
-				_logger.LogError(ex, ex.Message);
+				logger.LogError(ex, $"{nameof(Storage)}.{caller}");
-				return default;
+				return result.Invalidate(ex.Message, exception: ex);
 			}
 		}
-
 	}
 }

Services/IndexedDb.cs

@@ -1,14 +1,10 @@
-using DnetIndexedDb;
+using DnetIndexedDb;
 
 using Microsoft.JSInterop;
 
 namespace decePubClient.Services
 {
-	public class IndexedDb : IndexedDbInterop
+	public class IndexedDb(IJSRuntime jsRuntime, IndexedDbOptions<IndexedDb> options) : IndexedDbInterop(jsRuntime, options)
 	{
-		public IndexedDb(IJSRuntime jsRuntime, IndexedDbOptions<IndexedDb> options)
-		 : base(jsRuntime, options)
-		{
-		}
 	}
 }

Services/MessagesService.cs

@@ -1,74 +1,88 @@
-using decePubClient.Models;
+using collAnon.Client.Services;
+
+using decePubClient.Extensions;
+using decePubClient.Models;
 using decePubClient.Models.Types;
 
+using PrivaPub.ClientModels;
+
 namespace decePubClient.Services
 {
-	public class MessagesService
+	/// <summary>
+	/// Message actions. Still a mock: the app isn't wired to PrivaPub yet, so each method builds its result in memory.
+	/// The signatures are the real ones (a Task&lt;WebResult&gt; whose Data is the updated entity), so wiring means
+	/// calling httpService against PrivaPub's /clientapi/post/* routes inside the same try/catch, reading failures with
+	/// ReadWebResult and the body with DefaultReadFromJsonAsync, as b2b.next's StoreService does.
+	/// </summary>
+	public class MessagesService(ILoggingService logger, CoalescingStringLocalizer localizer)
 	{
-		readonly IStorage storage;
+		/// <summary>Posts a message or, with RootMessageId set, a reply; Data is the new Message.</summary>
-		readonly HttpClient http;
+		public Task<WebResult> SubmitMessage(MessageForm messageForm, User author, CancellationToken cancellationToken = default) =>
+			Run(nameof(SubmitMessage), () => (object)new Message
+			{
+				RootMessageId = messageForm.RootMessageId,
+				MessageId = Guid.NewGuid().ToString(),
+				Content = messageForm.Content?.ParseContent(messageForm.ContentType),
+				CreatedAt = DateTime.UtcNow,
+				MessageType = messageForm.MessageType,
+				Medias = [.. messageForm.Media.Select(m => new Media
+				{
+					FileName = m.FileName,
+					AltText = m.AltText,
+					ContentType = m.ContentType,
+					Url = m.Base64Preview,
+					Blob = m.Blob
+				})],
+				Title = messageForm.Title,
+				User = author.ToMessageUser()
+			}, cancellationToken);
 
-		public MessagesService(IHttpClientFactory clientFactory, IStorage storage)
+		/// <summary>Opens a reply of the given scope to a message; Data is the message.</summary>
+		public Task<WebResult> ReplyMessage(Message messageToReply, MessageType messageType = MessageType.Public, CancellationToken cancellationToken = default) =>
+			Run(nameof(ReplyMessage), () => messageToReply, cancellationToken);
+
+		/// <summary>Boosts the message, or takes the boost back; Data is the message with its counter updated.</summary>
+		public Task<WebResult> BoostUnboostMessage(Message message, CancellationToken cancellationToken = default) =>
+			Run(nameof(BoostUnboostMessage), () =>
 			{
-			this.storage = storage;
+				message.BoostsCounter += message.IsBoostedByCurrentUser ? -1 : 1;
-			http = clientFactory.CreateClient("default");
+				message.IsBoostedByCurrentUser = !message.IsBoostedByCurrentUser;
+				return message;
+			}, cancellationToken);
+
+		/// <summary>Adds the message to the favourites, or removes it; Data is the updated message.</summary>
+		public Task<WebResult> FavouriteUnfavouriteMessage(Message message, CancellationToken cancellationToken = default) =>
+			Run(nameof(FavouriteUnfavouriteMessage), () =>
+			{
+				message.IsFavourite = !message.IsFavourite;
+				return message;
+			}, cancellationToken);
+
+		public Task<WebResult> DeleteMessage(Message message, CancellationToken cancellationToken = default) =>
+			Run(nameof(DeleteMessage), () => message, cancellationToken);
+
+		public Task<WebResult> BlockUserFromMessage(MessageUser messageUser, CancellationToken cancellationToken = default) =>
+			Run(nameof(BlockUserFromMessage), () => messageUser, cancellationToken);
+
+		public Task<WebResult> SilenceUserFromMessage(MessageUser messageUser, CancellationToken cancellationToken = default) =>
+			Run(nameof(SilenceUserFromMessage), () => messageUser, cancellationToken);
+
+		/// <summary>The mock's stand-in for an API call: the same success/failure handling, with the outcome built locally.</summary>
+		async Task<WebResult> Run(string caller, Func<object> action, CancellationToken cancellationToken)
+		{
+			var result = new WebResult();
+			try
+			{
+				cancellationToken.ThrowIfCancellationRequested();
+				await Task.Yield();
+				result.Data = action();
+				return result;
 			}
-
+			catch (Exception ex)
-		//Covers also direct message
-		public async Task<Message> SubmitMessage(MessageForm messageForm)
 			{
-			//TODO
+				await logger.ProcessError(ex, $"{nameof(MessagesService)}.{caller}", cancellationToken);
-
+				return result.Invalidate(localizer["The action could not be completed."], exception: ex);
-			await Task.Run(() => {});
-			return new();
 			}
-
-		//Covers also direct message
-		public async Task<Message> ReplyMessage(Message messageToReply, MessageType messageType = MessageType.Public)
-		{
-			//TODO
-
-			await Task.Run(() => {});
-			return messageToReply;
-		}
-
-		public async Task<Message> BoostUnboostMessage(Message messageToReply)
-		{
-			//TODO
-
-			await Task.Run(() => {});
-			return messageToReply;
-		}
-
-		public async Task<Message> FavouriteUnfavouriteMessage(Message messageToReply)
-		{
-			//TODO
-
-			await Task.Run(() => {});
-			return messageToReply;
-		}
-
-		public async Task<Message> DeleteMessage(Message messageToReply)
-		{
-			//TODO
-
-			await Task.Run(() => {});
-			return messageToReply;
-		}
-
-		public async Task<MessageUser> BlockUserFromMessage(MessageUser messageUser)
-		{
-			//TODO
-			await Task.Run(() => {});
-			return messageUser;
-		}
-
-		public async Task<MessageUser> SilenceUserFromMessage(MessageUser messageUser)
-		{
-			//TODO
-
-			await Task.Run(() => {});
-			return messageUser;
 		}
 	}
 }

Services/ToastService.cs

@@ -0,0 +1,55 @@
+namespace decePubClient.Services;
+
+public enum ToastSeverity
+{
+	Info,
+	Success,
+	Warning,
+	Error
+}
+
+public sealed record ToastMessage(Guid Id, ToastSeverity Severity, string Text);
+
+/// <summary>
+/// The app's snackbar: components add messages (usually through the SUtility extensions AddResponseError,
+/// AddResponseSuccess, AddWarning, AddException) and Components/ToastHost.razor, placed once in MainLayout, shows them.
+/// A message already on screen isn't added twice, and at most MaxMessages stay, oldest dropped first.
+/// </summary>
+public class ToastService
+{
+	const int MaxMessages = 12;
+
+	readonly List<ToastMessage> messages = [];
+
+	public event Action Changed;
+
+	public IReadOnlyList<ToastMessage> Messages => messages;
+
+	/// <summary>Shows a message; with closeAfter it closes itself, otherwise it stays until the user closes it.</summary>
+	public void Add(ToastSeverity severity, string text, TimeSpan? closeAfter = null)
+	{
+		if (string.IsNullOrWhiteSpace(text) || messages.Any(m => m.Severity == severity && m.Text == text))
+			return;
+
+		var message = new ToastMessage(Guid.NewGuid(), severity, text);
+		messages.Add(message);
+		if (messages.Count > MaxMessages)
+			messages.RemoveAt(0);
+		Changed?.Invoke();
+
+		if (closeAfter is { } delay)
+			_ = CloseLater(message.Id, delay);
+	}
+
+	public void Close(Guid id)
+	{
+		if (messages.RemoveAll(m => m.Id == id) > 0)
+			Changed?.Invoke();
+	}
+
+	async Task CloseLater(Guid id, TimeSpan delay, CancellationToken cancellationToken = default)
+	{
+		await Task.Delay(delay, cancellationToken);
+		Close(id);
+	}
+}

Services/TokenAuthStateProvider.cs

@@ -1,4 +1,5 @@
 using Blazored.LocalStorage;
+using decePubClient.Helpers;
 using decePubClient.Models;
 using Microsoft.AspNetCore.Components.Authorization;
 using System.Security.Claims;
@@ -6,22 +7,9 @@ using System.Text.Json;
 
 namespace decePubClient.Services
 {
-	public class TokenAuthStateProvider : AuthenticationStateProvider
+	public class TokenAuthStateProvider(ILocalStorageService storage, IStorage dbStorage, ILogger<TokenAuthStateProvider> logger)
+		: AuthenticationStateProvider
 	{
-		readonly ILocalStorageService Storage;
-		readonly IStorage DbStorage;
-		readonly ILogger<TokenAuthStateProvider> Logger;
-		AuthData AuthData { get; set; }
-
-		public TokenAuthStateProvider(ILocalStorageService storage,
-			IStorage dbStorage,
-			ILogger<TokenAuthStateProvider> logger)
-		{
-			Storage = storage;
-			DbStorage = dbStorage;
-			Logger = logger;
-		}
-
 		public void SetToken(/*string token, long expirationTicks = default*/)
 		{
 			//AuthData = await Storage.GetItemAsync<AuthData>(nameof(AuthData));
@@ -41,41 +29,40 @@ namespace decePubClient.Services
 			NotifyAuthenticationStateChanged(GetAuthenticationStateAsync());
 		}
 
-		public async ValueTask<bool> IsAuthenticatedAsync()
+		/// <summary>The stored token while it is still valid, otherwise null.</summary>
+		public async Task<string> GetToken(CancellationToken cancellationToken = default)
 		{
-			AuthData = await Storage.GetItemAsync<AuthData>(nameof(AuthData));
+			var authData = await storage.GetItemAsync<AuthData>(nameof(AuthData), cancellationToken);
-			if (AuthData is null)
+			if (string.IsNullOrEmpty(authData?.Token) || authData.TokenExpiration is not { } expiration || expiration <= DateTime.UtcNow.Ticks)
-			{
+				return null;
-				AuthData = new();
+			return authData.Token;
-				await Storage.SetItemAsync(nameof(AuthData), AuthData);
-			}
-			return AuthData.Token != null &&
-				AuthData.TokenExpiration.HasValue &&
-				AuthData.TokenExpiration.Value > DateTime.UtcNow.Ticks;
 		}
 
-		public async Task LogoutAsync(bool deleteDb = false)
+		public async Task<bool> IsAuthenticatedAsync(CancellationToken cancellationToken = default) =>
+			await GetToken(cancellationToken) is not null;
+
+		public async Task LogoutAsync(bool deleteDb = false, CancellationToken cancellationToken = default)
 		{
-			Logger.LogInformation($"set null({nameof(LogoutAsync)})");
+			logger.LogInformation($"set null({nameof(LogoutAsync)})");
 			//await Storage.RemoveItemAsync(nameof(PrivateCacheData));
-			await Storage.RemoveItemAsync(nameof(AuthData));
+			await storage.RemoveItemAsync(nameof(AuthData), cancellationToken);
 			if (deleteDb)
-				await DbStorage.RemoveAll(includeClientLogs: true);
+				await dbStorage.RemoveAll(includeClientLogs: true, cancellationToken: cancellationToken);
 
 			NotifyAuthenticationStateChanged(GetAuthenticationStateAsync());
 		}
 
 		public override async Task<AuthenticationState> GetAuthenticationStateAsync()
 		{
-			AuthData = await Storage.GetItemAsync<AuthData>(nameof(AuthData));
+			var authData = await storage.GetItemAsync<AuthData>(nameof(AuthData));
-			if (string.IsNullOrEmpty(AuthData?.Token))
+			if (string.IsNullOrEmpty(authData?.Token))
 			{
-				Logger.LogInformation($"set null({nameof(GetAuthenticationStateAsync)})");
+				logger.LogInformation($"set null({nameof(GetAuthenticationStateAsync)})");
 				return new(new());
 			}
 			var claims = new List<Claim>
 			{
-				new(ClaimTypes.UserData, JsonSerializer.Serialize(AuthData.User))
+				new(ClaimTypes.UserData, JsonSerializer.Serialize(authData.User, SUtility.DefaultSerializer))
 			};
 
 			//claims.Add(new(Policies.IsUser, (AuthData.User.Policies.Contains(Policies.IsUser)).ToString().ToLower()));

Shared/LoginDisplay.razor

@@ -1,5 +1,4 @@
 @inherits LocalizableComponentBase
-@inject NavigationManager Navigation
 
 <AuthorizeView>
 	<Authorized>
@@ -15,7 +14,6 @@
 </AuthorizeView>
 
 @code {
-	[CascadingParameter] CascadingState CascadingState { get; set; }
 	private void BeginSignOut(MouseEventArgs args)
 	{
 		Navigation.NavigateTo("logout");

Shared/MainLayout.razor

@@ -9,3 +9,5 @@
 		</div>
 	</div>
 </div>
+
+<ToastHost />

Shared/NavMenu.razor

@@ -9,19 +9,19 @@
 		<div class="absolute bg-base-100 md:relative top-full md:top-auto mt-2 w-52 md:w-full overflow-y-auto rounded-lg neo-raised neo-sm md:shadow-none! z-50 @menuToggle md:block">
 			<div class="flex flex-col gap-3 p-3 md:p-4">
 
-				<div class="flex gap-3 p-3 md:p-4 neo-raised neo-xs rounded-xl bg-cover bg-no-repeat bg-right" style="background-image:linear-gradient(to left, var(--color-base-100) 55%, transparent), url('@(CascadingState.User?.BackgroundUrl)');">
+				<div class="flex gap-3 p-3 md:p-4 neo-raised neo-xs rounded-xl bg-cover bg-no-repeat bg-right" style="background-image:linear-gradient(to left, var(--color-base-100) 55%, transparent), url('@(CascadingState.User.BackgroundUrl)');">
-					<a class="block h-8 w-8 md:h-12 md:w-12 flex-none" href="@CascadingState.User?.ProfileUrl" title="@CascadingState.User?.UserName">
+					<a class="block h-8 w-8 md:h-12 md:w-12 flex-none" href="@CascadingState.User.ProfileUrl" title="@CascadingState.User.UserName">
-						<img alt="@CascadingState.User?.UserName" class="h-8 w-8 md:h-12 md:w-12 object-cover rounded-full neo-raised neo-2xs" src="@(CascadingState.User?.PictureUrl ?? "/imgs/icon-192.png")" />
+						<img alt="@CascadingState.User.UserName" class="h-8 w-8 md:h-12 md:w-12 object-cover rounded-full neo-raised neo-2xs" src="@(CascadingState.User.PictureUrl ?? "/imgs/icon-192.png")" />
 					</a>
 					<div class="flex flex-col w-full min-w-0 gap-2">
 						<p class="shrink truncate">
-							<b title="@CascadingState.User?.DisplayName">
+							<b title="@CascadingState.User.DisplayName">
-								@CascadingState.User?.DisplayName
+								@CascadingState.User.DisplayName
 							</b>
 						</p>
 						<p class="flex-1 min-w-6 truncate text-xs">
-							<a class="underline" href="@CascadingState.User?.ProfileUrl" title="@CascadingState.User?.UserName">
+							<a class="underline" href="@CascadingState.User.ProfileUrl" title="@CascadingState.User.UserName">
-								@CascadingState.User?.UserName
+								@CascadingState.User.UserName
 							</a>
 						</p>
 					</div>
@@ -94,21 +94,19 @@
 
 	<div class="md:hidden">
 		<a class="block rounded-full neo-raised neo-2xs" href="settings">
-			<img alt="@CascadingState.User?.UserName" class="object-cover w-[30px] h-[30px] rounded-full"
+			<img alt="@CascadingState.User.UserName" class="object-cover w-[30px] h-[30px] rounded-full"
-					 src="@CascadingState.User?.PictureUrl">
+					 src="@CascadingState.User.PictureUrl">
 		</a>
 	</div>
 
 </nav>
 
 @code {
-	[CascadingParameter] CascadingState CascadingState { get; set; }
 	string menuToggle = "hidden";
 
-	PageSettings Settings => CascadingState.PublicCacheData?.PageSettings ?? new();
 	// The toggle and the slider work on the variant that is showing; with system theming that is the OS's choice.
 	bool IsDark => CascadingState.Status.IsDarkTheme();
-	short ThemeIndexColour => IsDark ? Settings.DarkThemeIndexColour : Settings.LightThemeIndexColour;
+	short ThemeIndexColour => IsDark ? CascadingState.PublicCacheData.PageSettings.DarkThemeIndexColour : CascadingState.PublicCacheData.PageSettings.LightThemeIndexColour;
 
 	protected override void OnInitialized()
 	{

Shared/RedirectToLogin.razor

@@ -1,6 +1,6 @@
-@inject NavigationManager Navigation
+@code {
+	[Inject] NavigationManager Navigation { get; set; }
 
-@code {
 	protected override void OnInitialized()
 	{
 		Navigation.NavigateTo($"authentication/login?returnUrl={Uri.EscapeDataString(Navigation.Uri)}");

_Imports.razor

@@ -19,6 +19,7 @@
 @using Markdig
 @using decePubClient
 @using decePubClient.Services
+@using collAnon.Client.Services
 @using decePubClient.Shared
 @using decePubClient.Models
 @using decePubClient.Models.Types