Outbound documents speak Mastodon's dialect under PrivaPub's route names

Local text (Domain/Content/ContentRenderer): Markdig with raw HTML off and autolinks, or plain text for API clients; then @user and @user@host are resolved (locally or through WebFinger) into Mastodon's h-card markup and #tags into hashtag links, skipping code, links and e-mail addresses. A post stores the result, its mentions and its tags, and is delivered to the mentioned actors and the parent's author as well as to followers. Renderer: - Mastodon's @context (toot, schema PropertyValue, discoverable, indexable, blurhash, focalPoint, featured, alsoKnownAs, movedTo) and FEP-2c59's webfinger; - an actor's url is its HTML page, its fields are PropertyValue attachments, published is cut to the day and indexable is false; - a note's content is the stored rendering; a title becomes name and a bold first line, a content warning without its own text is summarised by the title or "Content warning"; Mention and Hashtag tags, contentMap, updated, and to/cc by visibility. Routes take the agreed names: /groupies, /stalking, /scribbles/{id}, /grunts/{id} (a Create resolves), /whispers/{id} for a DM's context. The outbox is a collection with a first page, paged by max_id. A browser asking for an actor or a note is redirected to /@user, and WebFinger's profile-page points there. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB
2026-10-01 11:21:31 +02:00
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+using PrivaPub.Domain.Content;
+using PrivaPub.Federation.Actors;
+using PrivaPub.Infrastructure.Http;
+using PrivaPub.Models.Federation;
+using PrivaPub.Models.User;
+
+using GroupEntity = PrivaPub.Models.Group.Group;
+
+namespace PrivaPub.Tests.Domain
+{
+	public class ContentRendererTests
+	{
+		const string Base = "https://privapub.test";
+		readonly ContentRenderer _renderer = new(new StubLocalActors(), new StubRemoteActors());
+
+		[Fact]
+		public async Task Decorates_local_and_remote_mentions_and_hashtags()
+		{
+			var rendered = await _renderer.Markdown("hello @alice and @bob@m.example about #Fedi **now** <script>x</script>", TestContext.Current.CancellationToken);
+
+			Assert.Contains("<span class=\"h-card\" translate=\"no\"><a href=\"https://privapub.test/peasants/alice\" class=\"u-url mention\"", rendered.Html);
+			Assert.Contains("href=\"https://m.example/@bob\"", rendered.Html);
+			Assert.Contains("href=\"https://privapub.test/tags/fedi\" class=\"mention hashtag\"", rendered.Html);
+			Assert.Contains("<strong>now</strong>", rendered.Html);
+			Assert.DoesNotContain("<script>", rendered.Html);
+			Assert.Equal(new[] { "https://m.example/users/bob", "https://privapub.test/peasants/alice" }, rendered.Mentions.Select(m => m.ActorUri).Order(StringComparer.Ordinal));
+			Assert.Equal("fedi", Assert.Single(rendered.Tags));
+		}
+
+		[Theory]
+		[InlineData("`@alice` in code")]
+		[InlineData("mail me@alice.example")]
+		[InlineData("@nobody is unknown")]
+		[InlineData("see https://x.example/page#alice")]
+		public async Task Leaves_what_is_not_a_mention_alone(string text)
+		{
+			var rendered = await _renderer.Markdown(text, TestContext.Current.CancellationToken);
+
+			Assert.Empty(rendered.Mentions);
+			Assert.DoesNotContain("h-card", rendered.Html);
+		}
+
+		[Theory]
+		[InlineData("issue #123")]
+		[InlineData("it&#39;s fine")]
+		[InlineData("[link](https://x.example/#tag)")]
+		public async Task Leaves_what_is_not_a_hashtag_alone(string text) =>
+			Assert.Empty((await _renderer.Markdown(text, TestContext.Current.CancellationToken)).Tags);
+
+		[Fact]
+		public async Task Renders_plain_text_like_mastodon()
+		{
+			var rendered = await _renderer.PlainText("line one\nline <two>\n\nsee https://x.example/a?b=1. #Tag", TestContext.Current.CancellationToken);
+
+			Assert.Equal("<p>line one<br>line &lt;two&gt;</p><p>see <a href=\"https://x.example/a?b=1\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https://x.example/a?b=1</a>. "
+				+ "<a href=\"https://privapub.test/tags/tag\" class=\"mention hashtag\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">#<span>Tag</span></a></p>", rendered.Html);
+		}
+
+		sealed class StubLocalActors : ILocalActorService
+		{
+			public string BaseAddress => Base;
+
+			public Task<LocalActor> FindByUserName(string userName, CancellationToken token) =>
+				Task.FromResult(userName.Equals("alice", StringComparison.OrdinalIgnoreCase)
+					? new LocalActor { Id = "a1", UserName = "alice", BaseAddress = Base, Kind = LocalActorKind.Person }
+					: default);
+
+			public Task<LocalActor> FindById(LocalActorKind kind, string id, CancellationToken token) => throw new NotSupportedException();
+			public Task<LocalActor> FindByUri(string actorUri, CancellationToken token) => throw new NotSupportedException();
+			public Task<LocalActor> GetInstanceActor(CancellationToken token) => throw new NotSupportedException();
+			public Task<bool> IsUserNameTaken(string userName, CancellationToken token) => throw new NotSupportedException();
+			public Task<bool> TryReserveUserName(string userName, LocalActorKind kind, string ownerId, CancellationToken token) => throw new NotSupportedException();
+			public LocalActor FromAvatar(Avatar avatar) => throw new NotSupportedException();
+			public LocalActor FromGroup(GroupEntity group) => throw new NotSupportedException();
+		}
+
+		sealed class StubRemoteActors : IRemoteActorService
+		{
+			public Task<string> ResolveHandle(string handle, CancellationToken token) =>
+				Task.FromResult(handle == "bob@m.example" ? "https://m.example/users/bob" : default);
+
+			public Task<ForeignAvatar> GetActor(string actorUri, bool refresh, CancellationToken token) =>
+				Task.FromResult(actorUri == "https://m.example/users/bob"
+					? new ForeignAvatar { ID = "f1", ActorURI = actorUri, UserName = "bob", Url = "https://m.example/@bob", InboxURL = actorUri + "/inbox" }
+					: default);
+
+			public Task<FetchedJson> FetchObject(string uri, CancellationToken token) => throw new NotSupportedException();
+			public Task<ForeignAvatar> GetActorByKeyId(string keyId, bool refresh, CancellationToken token) => throw new NotSupportedException();
+		}
+	}
+}
@@ -0,0 +1,103 @@
+using PrivaPub.Federation.Actors;
+using PrivaPub.Federation.Rendering;
+using PrivaPub.Models.Federation;
+using PrivaPub.Models.Post;
+
+using System.Text.Json.Nodes;
+
+namespace PrivaPub.Tests.Federation
+{
+	public class RendererTests
+	{
+		static readonly LocalActor Alice = new()
+		{
+			Id = "a1",
+			Kind = LocalActorKind.Person,
+			UserName = "alice",
+			Name = "Alice",
+			Summary = "I **like** <b>cats</b>",
+			PublicKeyPem = Keys.NewKeyPair().PublicKeyPem,
+			Published = new DateTime(2026, 9, 30, 17, 45, 12, DateTimeKind.Utc),
+			Fields = new Dictionary<string, string> { ["site"] = "https://alice.example", ["mood"] = "<i>ok</i>" },
+			BaseAddress = "https://privapub.test"
+		};
+
+		[Fact]
+		public void An_actor_looks_like_a_mastodon_actor_with_our_route_names()
+		{
+			var actor = ActivityPubRenderer.Actor(Alice);
+
+			Assert.Equal("https://privapub.test/peasants/alice", actor["id"]!.GetValue<string>());
+			Assert.Equal("https://privapub.test/@alice", actor["url"]!.GetValue<string>());
+			Assert.Equal("https://privapub.test/peasants/alice/mouth", actor["inbox"]!.GetValue<string>());
+			Assert.Equal("https://privapub.test/peasants/alice/anus", actor["outbox"]!.GetValue<string>());
+			Assert.Equal("https://privapub.test/peasants/alice/groupies", actor["followers"]!.GetValue<string>());
+			Assert.Equal("https://privapub.test/peasants/alice/stalking", actor["following"]!.GetValue<string>());
+			Assert.Equal("https://privapub.test/human-centipede", actor["endpoints"]!["sharedInbox"]!.GetValue<string>());
+			Assert.Equal("2026-09-30T00:00:00Z", actor["published"]!.GetValue<string>());
+			Assert.Equal("alice@privapub.test", actor["webfinger"]!.GetValue<string>());
+			Assert.False(actor["indexable"]!.GetValue<bool>());
+			Assert.Equal("<p>I <strong>like</strong> &lt;b&gt;cats&lt;/b&gt;</p>", actor["summary"]!.GetValue<string>());
+			var fields = actor["attachment"]!.AsArray();
+			Assert.Contains("rel=\"nofollow noopener noreferrer me\"", fields[0]!["value"]!.GetValue<string>());
+			Assert.Equal("&lt;i&gt;ok&lt;/i&gt;", fields[1]!["value"]!.GetValue<string>());
+			Assert.Equal("https://privapub.test/peasants/alice#main-key", actor["publicKey"]!["id"]!.GetValue<string>());
+			Assert.Equal(actor["id"]!.GetValue<string>(), actor["publicKey"]!["owner"]!.GetValue<string>());
+		}
+
+		[Fact]
+		public void A_titled_post_with_a_warning_keeps_the_title_visible_on_mastodon()
+		{
+			var post = new Post
+			{
+				ID = "p1",
+				Title = "On <cats>",
+				ContentHtml = "<p>body</p>",
+				HasContentWarning = true,
+				Language = "en",
+				Mentions = new() { new PostMention { ActorURI = "https://m.example/users/bob", Handle = "@bob@m.example" } },
+				Tags = new() { "cats" },
+				CreationDate = new DateTime(2026, 9, 30, 17, 45, 12, DateTimeKind.Utc)
+			};
+
+			var note = ActivityPubRenderer.Note(post, Alice, default, "https://m.example/users/bob/statuses/1");
+
+			Assert.Equal("https://privapub.test/peasants/alice/scribbles/p1", note["id"]!.GetValue<string>());
+			Assert.Equal("https://privapub.test/@alice/p1", note["url"]!.GetValue<string>());
+			Assert.Equal("<p><strong>On &lt;cats&gt;</strong></p><p>body</p>", note["content"]!.GetValue<string>());
+			Assert.Equal("On <cats>", note["summary"]!.GetValue<string>());
+			Assert.True(note["sensitive"]!.GetValue<bool>());
+			Assert.Equal("2026-09-30T17:45:12Z", note["published"]!.GetValue<string>());
+			Assert.Equal(new[] { ActivityPubRenderer.Public }, note["to"]!.AsArray().Select(n => n!.GetValue<string>()));
+			Assert.Equal(new[] { Alice.Followers, "https://m.example/users/bob" }, note["cc"]!.AsArray().Select(n => n!.GetValue<string>()));
+			var tags = note["tag"]!.AsArray();
+			Assert.Equal("@bob@m.example", tags[0]!["name"]!.GetValue<string>());
+			Assert.Equal("https://privapub.test/tags/cats", tags[1]!["href"]!.GetValue<string>());
+			Assert.Equal("https://m.example/users/bob/statuses/1", note["inReplyTo"]!.GetValue<string>());
+			Assert.NotNull(note["contentMap"]!["en"]);
+		}
+
+		[Fact]
+		public void A_warning_without_a_title_or_spoiler_gets_a_generic_summary()
+		{
+			var note = ActivityPubRenderer.Note(new Post { ID = "p2", ContentHtml = "<p>x</p>", HasContentWarning = true }, Alice, default, default);
+
+			Assert.Equal(ActivityPubRenderer.ContentWarning, note["summary"]!.GetValue<string>());
+		}
+
+		[Fact]
+		public void A_direct_note_is_addressed_to_its_recipients_only()
+		{
+			var post = new Post { ID = "p3", ContentHtml = "<p>psst</p>", Visibility = PostVisibility.Direct };
+
+			var note = ActivityPubRenderer.DirectNote(post, Alice, new[] { ("https://m.example/users/bob", "bob@m.example") },
+				Alice.ConversationUri("c1"));
+
+			Assert.Equal(new[] { "https://m.example/users/bob" }, note["to"]!.AsArray().Select(n => n!.GetValue<string>()));
+			Assert.Empty(note["cc"]!.AsArray());
+			Assert.Equal("https://privapub.test/peasants/alice/whispers/c1", note["context"]!.GetValue<string>());
+			Assert.StartsWith("<p><span class=\"h-card\"", note["content"]!.GetValue<string>());
+			Assert.Equal("Mention", note["tag"]![0]!["type"]!.GetValue<string>());
+		}
+	}
+}