Services/Federation and Controllers/ServerToServer become
Federation/{Actors,Signing,Inbox,Outbox,Rendering,Controllers}, the first step
of the roadmap's layout. No type, route or behaviour changes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB
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using Markdig;
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using PrivaPub.Models.Federation;
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using System.Globalization;
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using System.Text.Json.Nodes;
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using PostEntity = PrivaPub.Models.Post.Post;
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using DmPostEntity = PrivaPub.Models.Post.DmPost;
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using PrivaPub.Federation.Actors;
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namespace PrivaPub.Federation.Rendering
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{
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public static class ActivityPubRenderer
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{
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public const string ActivityStreams = "https://www.w3.org/ns/activitystreams";
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public const string Public = "https://www.w3.org/ns/activitystreams#Public";
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static readonly MarkdownPipeline Pipeline = new MarkdownPipelineBuilder().DisableHtml().Build();
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public static string Html(string markdown) =>
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string.IsNullOrEmpty(markdown) ? string.Empty : Markdown.ToHtml(markdown, Pipeline).Trim();
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public static string Timestamp(DateTime value) =>
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DateTime.SpecifyKind(value, DateTimeKind.Utc).ToString("yyyy-MM-ddTHH:mm:ssZ", CultureInfo.InvariantCulture);
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public static JsonObject Actor(LocalActor actor)
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{
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var document = new JsonObject
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{
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["@context"] = new JsonArray(ActivityStreams, "https://w3id.org/security/v1"),
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["id"] = actor.Uri,
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["type"] = actor.Kind switch
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{
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LocalActorKind.Group => "Group",
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LocalActorKind.Application => "Application",
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_ => "Person"
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},
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["preferredUsername"] = actor.UserName,
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["name"] = actor.Name,
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["summary"] = Html(actor.Summary),
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["url"] = actor.Uri,
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["inbox"] = actor.Inbox,
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["outbox"] = actor.Outbox,
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["followers"] = actor.Followers,
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["following"] = actor.Following,
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["published"] = Timestamp(actor.Published),
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["manuallyApprovesFollowers"] = actor.ManuallyApprovesFollowers,
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["discoverable"] = actor.Discoverable,
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["endpoints"] = new JsonObject { ["sharedInbox"] = actor.SharedInbox },
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["publicKey"] = new JsonObject
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{
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["id"] = actor.KeyId,
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["owner"] = actor.Uri,
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["publicKeyPem"] = Keys.ToSubjectPublicKeyInfoPem(actor.PublicKeyPem)
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}
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};
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if (!string.IsNullOrEmpty(actor.PictureURL))
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document["icon"] = new JsonObject { ["type"] = "Image", ["url"] = actor.PictureURL };
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if (!string.IsNullOrEmpty(actor.ThumbnailURL))
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document["image"] = new JsonObject { ["type"] = "Image", ["url"] = actor.ThumbnailURL };
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return document;
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}
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public static JsonObject Note(PostEntity post, LocalActor author, LocalActor group, string inReplyTo)
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{
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var to = new JsonArray(Public);
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var cc = new JsonArray(author.Followers);
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if (group != default)
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cc.Add(group.Uri);
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var note = NoteBody(author.PostUri(post.ID), author, post.Title, post.Text, post.HasContentWarning,
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post.CreationDate, to, cc, inReplyTo);
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if (group != default)
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note["audience"] = group.Uri;
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return note;
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}
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public static JsonObject DirectNote(DmPostEntity post, LocalActor author, IReadOnlyList<(string Uri, string Handle)> recipients,
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string context)
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{
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var note = NoteBody(author.PostUri(post.ID), author, post.Title, post.Text, post.HasContentWarning,
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post.CreationDate, new JsonArray(recipients.Select(r => (JsonNode)r.Uri).ToArray()), new JsonArray(), default);
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note["tag"] = new JsonArray(recipients.Select(r => (JsonNode)new JsonObject
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{
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["type"] = "Mention",
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["href"] = r.Uri,
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["name"] = "@" + r.Handle
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}).ToArray());
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note["content"] = string.Join(" ", recipients.Select(r => $"<span class=\"h-card\"><a href=\"{r.Uri}\" class=\"u-url mention\">@{r.Handle}</a></span>"))
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+ " " + note["content"]!.GetValue<string>();
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if (!string.IsNullOrEmpty(context))
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note["context"] = context;
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return note;
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}
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static JsonObject NoteBody(string id, LocalActor author, string title, string text, bool sensitive,
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DateTime published, JsonArray to, JsonArray cc, string inReplyTo)
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{
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var note = new JsonObject
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{
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["id"] = id,
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["type"] = "Note",
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["attributedTo"] = author.Uri,
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["content"] = Html(text),
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["published"] = Timestamp(published),
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["url"] = id,
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["to"] = to,
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["cc"] = cc,
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["sensitive"] = sensitive
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};
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if (sensitive && !string.IsNullOrEmpty(title))
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note["summary"] = title;
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else if (!string.IsNullOrEmpty(title))
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note["name"] = title;
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if (!string.IsNullOrEmpty(inReplyTo))
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note["inReplyTo"] = inReplyTo;
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return note;
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}
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public static JsonObject Create(LocalActor actor, JsonObject note, string activityId) => new()
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{
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["@context"] = ActivityStreams,
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["id"] = actor.ActivityUri(activityId),
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["type"] = "Create",
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["actor"] = actor.Uri,
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["published"] = note["published"]?.DeepClone(),
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["to"] = note["to"]?.DeepClone(),
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["cc"] = note["cc"]?.DeepClone(),
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["object"] = note
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};
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public static JsonObject Announce(LocalActor group, string objectUri, string activityId) => new()
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{
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["@context"] = ActivityStreams,
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["id"] = group.ActivityUri(activityId),
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["type"] = "Announce",
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["actor"] = group.Uri,
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["published"] = Timestamp(DateTime.UtcNow),
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["to"] = new JsonArray(Public),
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["cc"] = new JsonArray(group.Followers),
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["object"] = objectUri
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};
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public static JsonObject Delete(LocalActor actor, string objectUri, string activityId, JsonArray to, JsonArray cc) => new()
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{
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["@context"] = ActivityStreams,
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["id"] = actor.ActivityUri(activityId),
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["type"] = "Delete",
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["actor"] = actor.Uri,
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["to"] = to,
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["cc"] = cc,
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["object"] = new JsonObject { ["id"] = objectUri, ["type"] = "Tombstone" }
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};
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public static JsonObject Accept(LocalActor actor, JsonNode follow, string activityId) => new()
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{
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["@context"] = ActivityStreams,
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["id"] = actor.ActivityUri(activityId),
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["type"] = "Accept",
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["actor"] = actor.Uri,
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["object"] = follow.DeepClone()
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};
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public static JsonObject OrderedCollection(string id, int totalItems, IEnumerable<JsonNode> items)
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{
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var collection = new JsonObject
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{
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["@context"] = ActivityStreams,
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["id"] = id,
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["type"] = "OrderedCollection",
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["totalItems"] = totalItems
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};
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if (items != default)
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collection["orderedItems"] = new JsonArray(items.ToArray());
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return collection;
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}
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}
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}
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