SocialPub/PrivaPub.Tests/Federation/RendererTests.cs

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, 345, 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("2026-09-30T17:45:12.345Z", 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>());
		}
	}
}