Lemmy 1.0's multi-communities and PieFed's feeds (`type: Feed`) resolve as accounts: the feed's `following` is kept
once a day with its counts, each community in it is read in turn, and `/api/v1/accounts/:id/following` lists them.
Lemmy's feed carries the instance's key and its text in `description`; both are taken as they are. Following a feed
answers 422 until the owner decides how a feed is followed.
A post moved to another community (PieFed's Move{object: post, origin, target}), relayed by the community it leaves,
goes there with its thread; a move into a community we host is not taken.
Checked in the pasture: a Lemmy 1.0 feed and a PieFed feed list their communities (ours among them); a PieFed post moved
from its web code arrives moved, with its comment.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB
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@@ -412,6 +412,48 @@ namespace PrivaPub.Tests.Federation
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Assert.Equal(0, (await DB.Default.Find<Post>().OneAsync(reply.ID, token)).FavouritesCount);
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}
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// PieFed moves a post to another community, and the community it leaves relays the Move: the post's thread goes with it
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[Fact]
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public async Task A_post_moved_to_another_community_takes_its_thread_along()
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{
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var token = TestContext.Current.CancellationToken;
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var (root, alice) = await _harness.Persona("alice");
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var community = new RemoteActor(_harness.Peer, "cats", type: "Group");
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var other = new RemoteActor(_harness.Peer, "dogs", type: "Group");
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var poster = new RemoteActor(_harness.Peer, "poster");
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await _harness.Follows.Follow(root, new FollowForm { AvatarId = alice.Id, Target = community.Id }, token);
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await DB.Default.Update<Following>().Match(f => f.AvatarId == alice.Id).Modify(f => f.State, FollowState.Accepted).ExecuteAsync(token);
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async Task<Post> Announced(JsonObject note)
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{
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note["audience"] = community.Id;
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_harness.Peer.Serve(new Uri(IdOf(note)).AbsolutePath, note.ToJsonString());
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await _harness.Deliver(community, "/human-centipede", Activity(community, "Announce", Create(poster, note)));
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return await DB.Default.Find<Post>().Match(p => p.ObjectURI == IdOf(note)).ExecuteSingleAsync(token);
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}
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var page = PublicNote(poster, "<p>misplaced</p>", community.Id);
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page["type"] = "Page";
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page["name"] = "misplaced";
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var post = await Announced(page);
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var comment = PublicNote(poster, "<p>a comment</p>", community.Id);
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comment["inReplyTo"] = IdOf(page);
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var answer = await Announced(comment);
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var move = new JsonObject
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{
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["id"] = NewId(poster, "moves"), ["type"] = "Move", ["actor"] = poster.Id, ["object"] = post.ObjectURI, ["origin"] = community.Id, ["target"] = other.Id
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};
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// only the community it leaves speaks for it
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await _harness.Deliver(community, "/human-centipede", Activity(community, "Announce", new JsonObject
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{
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["id"] = NewId(poster, "moves"), ["type"] = "Move", ["actor"] = poster.Id, ["object"] = post.ObjectURI, ["origin"] = other.Id, ["target"] = community.Id
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}));
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Assert.Equal(("dropped", "unsupported"), (Processed("Announce").Outcome, Processed("Announce").Reason));
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await _harness.Deliver(community, "/human-centipede", Activity(community, "Announce", move));
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Assert.Equal(("accepted", "moved"), (Processed("Announce").Outcome, Processed("Announce").Reason));
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Assert.Equal(other.Id, (await DB.Default.Find<Post>().OneAsync(post.ID, token)).AudienceURI);
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Assert.Equal(other.Id, (await DB.Default.Find<Post>().OneAsync(answer.ID, token)).AudienceURI);
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}
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// Lemmy's moderators lock a community's post and ban members, and the community relays both inside its Announce
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// (G-0006): a locked post takes no reply, a banned persona posts nothing there, until the Undo
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[Fact]
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@@ -0,0 +1,67 @@
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using PrivaPub.Federation.Actors;
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using PrivaPub.Models.Jobs;
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using PrivaPub.Tests.Support;
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using PrivaPub.Tests.Support.Host;
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using System.Net;
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using System.Text.Json.Nodes;
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namespace PrivaPub.Tests.Http
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{
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// Lemmy 1.0's multi-communities and PieFed's feeds are `Feed` actors whose `following` is their communities
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[Trait("Category", "Integration")]
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public sealed class MastodonFeedTests : IAsyncLifetime
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{
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PrivaPubHost _host;
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Peer _peer;
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public async ValueTask InitializeAsync()
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{
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Assert.SkipUnless(MongoFixture.Enabled, MongoFixture.Skip);
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_host = await PrivaPubHost.Shared();
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_peer = await Peer.Start();
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}
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public async ValueTask DisposeAsync()
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{
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if (_peer != default)
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await _peer.DisposeAsync();
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}
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[Fact]
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public async Task A_feed_shows_as_an_account_whose_following_is_its_communities()
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{
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var token = TestContext.Current.CancellationToken;
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var reader = await _host.Mastodon("feeder");
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var cats = new RemoteActor(_peer, "cats", type: "Group");
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var dogs = new RemoteActor(_peer, "dogs", type: "Group");
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var name = $"feed{Guid.NewGuid():N}"[..12];
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var feed = $"{_peer.A}/m/{name}";
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// as Lemmy serves one: the instance's inbox and key, its text in `description`
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_peer.Serve($"/m/{name}", new JsonObject
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{
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["@context"] = new JsonArray("https://join-lemmy.org/context.json", "https://www.w3.org/ns/activitystreams"),
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["type"] = "Feed", ["id"] = feed, ["inbox"] = $"{_peer.A}/inbox",
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["publicKey"] = new JsonObject { ["id"] = $"{_peer.A}/#main-key", ["owner"] = $"{_peer.A}/", ["publicKeyPem"] = "-----BEGIN PUBLIC KEY-----\n-----END PUBLIC KEY-----\n" },
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["following"] = $"{feed}/following", ["preferredUsername"] = name, ["name"] = "Pets", ["description"] = "every pet",
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["attributedTo"] = $"{_peer.A}/users/owner"
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}.ToJsonString());
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_peer.Serve($"/m/{name}/following", new JsonObject
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{
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["type"] = "Collection", ["id"] = $"{feed}/following", ["totalItems"] = 2, ["items"] = new JsonArray(cats.Id, dogs.Id)
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}.ToJsonString());
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var account = await _host.Get<IRemoteActorService>().GetActor(feed, refresh: true, token);
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Assert.NotNull(account);
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await _host.Run(j => j.Kind == JobKind.CountAccount && j.Payload == feed, token);
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var shown = (await reader.Client.Get($"/api/v1/accounts/{account.ID}")).Ok().Body;
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Assert.Equal(("Pets", 2), (shown.Text("display_name"), shown.Number("following_count")));
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Assert.Contains("every pet", shown.Text("note"));
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var communities = (await reader.Client.Get($"/api/v1/accounts/{account.ID}/following")).Ok().Array;
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Assert.Equal(new[] { cats.Id, dogs.Id }, communities.Select(c => c.Text("uri")));
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Assert.All(communities, c => Assert.True(c!["group"]!.GetValue<bool>()));
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Assert.Equal(HttpStatusCode.UnprocessableEntity, (await reader.Client.Post($"/api/v1/accounts/{account.ID}/follow")).Status);
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}
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}
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}
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