43 lines
2.3 KiB
C#
43 lines
2.3 KiB
C#
 
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using MongoDB.Entities;
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using PrivaPub.Federation.Actors;
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using PrivaPub.Federation.Outbox;
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using PrivaPub.Infrastructure.Statistics;
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using PrivaPub.Models.Federation;
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using PrivaPub.Models.Post;
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using PrivaPub.StaticServices;
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using System.Text.Json.Nodes;
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using PostEntity = PrivaPub.Models.Post.Post;
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namespace PrivaPub.Federation.Inbox
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{
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// ActivityPub's inbox forwarding of replies (owner decision 2026-10-05): a public or unlisted reply to one of our
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// personas' own posts reaches the persona's followers as its author sent it, and so do its edits and its deletion, as
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// Mastodon forwards the replies to its accounts' posts. The author's server sends a reply to its own followers and to
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// the persona, never to the persona's followers, who would otherwise see half of the thread. It goes as it came (an
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// LD signature in it stays good), signed by the persona; never to the replier's own server, never once more when it
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// reached us forwarded, and never for a followers-only reply or a DM, which were not for the persona's followers.
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public static class ReplyRelay
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{
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public static async Task Pass(PostEntity reply, DbEntities db, ILocalActorService localActors, IDeliveryService delivery, CancellationToken token)
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{
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var raw = Arrival.Current?.Raw;
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if (raw == default || delivery == default || localActors == default || reply is not { IsFederatedCopy: true }
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|| reply.Visibility is not (PostVisibility.Public or PostVisibility.Unlisted) || string.IsNullOrEmpty(reply.AnsweringToPostId))
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return;
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var parent = await db.Posts.MatchID(reply.AnsweringToPostId).ExecuteFirstAsync(token);
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if (parent is not { IsFederatedCopy: false, IsLocalOnly: false } || !string.IsNullOrEmpty(parent.GroupId)
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|| parent.Visibility is not (PostVisibility.Public or PostVisibility.Unlisted or PostVisibility.FollowersOnly))
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return;
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var owner = await localActors.FindById(LocalActorKind.Person, parent.GroupUserId, token);
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if (owner is not { IsFederated: true } || JsonNode.Parse(raw) is not JsonObject activity)
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return;
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var replier = Interactions.HostOf(reply.ActorURI);
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var inboxes = (await delivery.FollowerInboxes(owner, token)).Where(i => Interactions.HostOf(i) != replier).ToList();
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if (inboxes.Count > 0)
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await delivery.Enqueue(owner, inboxes, activity, token);
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}
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}
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}
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