Blocks, mutes, bookmarks, pins and reports

- Blocks are per persona and never federate (a Block activity would tell
  the other server who blocked whom): the blocked account is removed as a
  follower, with a Reject{Follow} if it is remote, unfollowed, cleared from
  home and notifications, and refused with Reject if it follows again.
- Mutes (optionally timed, optionally sparing notifications) and per-
  persona domain blocks keep authors out of home timelines, notifications
  and every status list the API returns; the boosts of a hidden author's
  posts are hidden too.
- Bookmarks and pins (at most five, public or unlisted, own posts) with
  their Mastodon endpoints and flags; pinned posts are the actor's
  `featured` collection at /trophies, and `featuredTags` points at
  /tattoos.
- Reports: /api/v1/reports stores the report and, when forwarding to a
  remote account, sends Flag from the instance actor, so the reporting
  persona is never named to the other server. An inbound Flag about a local
  persona or its posts becomes a report; moderators list and resolve them
  under /clientapi/moderator/reports.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB

PrivaPub/Federation/Actors/LocalActorService.cs

@@ -42,6 +42,8 @@ namespace PrivaPub.Federation.Actors
 		public string Outbox => $"{Uri}/anus";
 		public string Followers => $"{Uri}/groupies";
 		public string Following => $"{Uri}/stalking";
+		public string Featured => $"{Uri}/trophies";
+		public string FeaturedTags => $"{Uri}/tattoos";
 		public string SharedInbox => $"{BaseAddress}/human-centipede";
 		public string Domain => new Uri(BaseAddress).Authority;
 		public string Handle => $"{UserName}@{Domain}";

PrivaPub/Federation/Controllers/PeasantsController.cs

@@ -5,6 +5,7 @@ using MongoDB.Entities;
 
 using PrivaPub.Models.Federation;
 using PrivaPub.Models.Post;
+using PrivaPub.Models.Social;
 using PrivaPub.StaticServices;
 
 using System.Text.Json.Nodes;
@@ -112,6 +113,34 @@ namespace PrivaPub.Federation.Controllers
 			return local is not { IsFederated: true } ? NotFound() : Activity(ActivityPubRenderer.OrderedCollection(local.Following, 0, default));
 		}
 
+		[HttpGet, Route("{actor}/trophies")]
+		public async Task<IActionResult> Featured(string actor, CancellationToken token)
+		{
+			var local = await _localActors.FindByUserName(actor, token);
+			if (local is not { IsFederated: true })
+				return NotFound();
+			var pinIds = (await DB.Default.Find<Pin>().Match(p => p.AvatarId == local.Id).Sort(p => p.ID, Order.Descending).ExecuteAsync(token))
+				.Select(p => p.PostId).ToList();
+			var posts = pinIds.Count == 0
+				? new List<PostEntity>()
+				: await _dbEntities.Posts.Match(p => pinIds.Contains(p.ID) && p.GroupUserId == local.Id && p.ReblogOfPostId == null)
+					.Match(VisibilityPolicy.IsPublic).ExecuteAsync(token);
+			var notes = new List<JsonNode>();
+			foreach (var id in pinIds)
+				if (posts.FirstOrDefault(p => p.ID == id) is { } post)
+					notes.Add(ActivityPubRenderer.Note(post, local, default, post.InReplyToURI));
+			return Activity(ActivityPubRenderer.OrderedCollection(local.Featured, notes.Count, notes));
+		}
+
+		[HttpGet, Route("{actor}/tattoos")]
+		public async Task<IActionResult> FeaturedTags(string actor, CancellationToken token)
+		{
+			var local = await _localActors.FindByUserName(actor, token);
+			return local is not { IsFederated: true }
+				? NotFound()
+				: Activity(ActivityPubRenderer.OrderedCollection(local.FeaturedTags, 0, Enumerable.Empty<JsonNode>()));
+		}
+
 		[HttpGet, Route("{actor}/scribbles/{postId}")]
 		public async Task<IActionResult> Post(string actor, string postId, CancellationToken token)
 		{

PrivaPub/Federation/Inbox/Handlers/FlagHandler.cs

@@ -0,0 +1,66 @@
+using MongoDB.Entities;
+
+using PrivaPub.Federation.Actors;
+using PrivaPub.Models.Federation;
+using PrivaPub.Models.Social;
+using PrivaPub.Models.User;
+using PrivaPub.StaticServices;
+
+using System.Text.Json.Nodes;
+
+using static PrivaPub.Federation.Objects.ActivityJson;
+
+namespace PrivaPub.Federation.Inbox.Handlers
+{
+	public class FlagHandler : IActivityHandler
+	{
+		readonly DbEntities _dbEntities;
+		readonly ILocalActorService _localActors;
+
+		public FlagHandler(DbEntities dbEntities, ILocalActorService localActors)
+		{
+			_dbEntities = dbEntities;
+			_localActors = localActors;
+		}
+
+		public string Type => "Flag";
+
+		public async Task Handle(JsonNode activity, ForeignAvatar actor, CancellationToken token)
+		{
+			var objects = activity["object"] switch
+			{
+				JsonArray array => array.Select(Id).Where(i => i != default).ToList(),
+				JsonNode single when Id(single) is { } id => new List<string> { id },
+				_ => new List<string>()
+			};
+
+			LocalActor target = default;
+			var postUris = new List<string>();
+			foreach (var uri in objects.Take(50))
+			{
+				var local = await _localActors.FindByUri(uri, token);
+				if (local is { Kind: LocalActorKind.Person } && uri.TrimEnd('/') == local.Uri)
+					target ??= local;
+				else
+					postUris.Add(uri);
+			}
+			var posts = postUris.Count == 0
+				? new List<Models.Post.Post>()
+				: await _dbEntities.Posts.Match(p => postUris.Contains(p.ObjectURI) && !p.IsFederatedCopy).ExecuteAsync(token);
+			if (target == default && posts.Count > 0)
+				target = await _localActors.FindById(LocalActorKind.Person, posts[0].GroupUserId, token);
+			if (target == default)
+				return;
+
+			await DB.Default.SaveAsync(new Report
+			{
+				ReporterActorURI = actor.ActorURI,
+				TargetAccountId = target.Id,
+				TargetActorURI = target.Uri,
+				PostIds = posts.Where(p => p.GroupUserId == target.Id).Select(p => p.ID).ToList(),
+				ObjectURIs = posts.Where(p => p.GroupUserId == target.Id).Select(p => p.ObjectURI).ToList(),
+				Comment = Value(activity, "content")
+			}, token);
+		}
+	}
+}

PrivaPub/Federation/Inbox/Handlers/FollowHandler.cs

@@ -46,6 +46,20 @@ namespace PrivaPub.Federation.Inbox.Handlers
 			var target = await _localActors.FindByUri(Id(follow["object"]), token);
 			if (target is not { IsFederated: true } || target.Kind == LocalActorKind.Application)
 				return;
+			if (target.Kind == LocalActorKind.Person
+				&& await DB.Default.Find<Models.Social.Block>().Match(b => b.AvatarId == target.Id && b.TargetActorURI == follower.ActorURI).ExecuteAnyAsync(token))
+			{
+				var reject = new JsonObject
+				{
+					["@context"] = ActivityPubRenderer.ActivityStreams,
+					["id"] = target.ActivityUri($"reject-{Guid.NewGuid():N}"),
+					["type"] = "Reject",
+					["actor"] = target.Uri,
+					["object"] = follow.DeepClone()
+				};
+				await _delivery.Enqueue(target, new[] { follower.InboxURL }, reject, token);
+				return;
+			}
 
 			var existing = await _dbEntities.Followers
 				.Match(f => f.LocalActorId == target.Id && f.LocalActorKind == target.Kind && f.ActorURI == follower.ActorURI)

PrivaPub/Federation/Rendering/ActivityPubRenderer.cs

@@ -76,6 +76,8 @@ namespace PrivaPub.Federation.Rendering
 				["outbox"] = actor.Outbox,
 				["followers"] = actor.Followers,
 				["following"] = actor.Following,
+				["featured"] = actor.Featured,
+				["featuredTags"] = actor.FeaturedTags,
 				["published"] = Day(actor.Published),
 				["manuallyApprovesFollowers"] = actor.ManuallyApprovesFollowers,
 				["discoverable"] = actor.Discoverable,