Files
SocialPub/PrivaPub/Federation/Inbox/Handlers/UndoHandler.cs
T
thepraandClaude Opus 5.5 e9529310fe One Post model for every visibility, read from notes the way peers write them
Post gains what federation and the Mastodon API need: Visibility (Public,
Unlisted, FollowersOnly, Direct, Circle, LocalGeo), the author's account
id, to/cc, the Create's id, url, context, quote, InReplyToURI and the
parent's author, a separate SpoilerText next to the title, language,
mentions, hashtags, remote attachments (alt text, blurhash, focus, size),
reply/favourite/reblog counters, revisions, EditedAt and DeletedAt.

Direct messages are Posts with Visibility Direct and a ConversationId;
migration _005 copies DmPost rows across with their ids and fills the new
fields of existing posts. DmPost is left in place so a rollback still sees
the old messages.

Inbound:
- NoteParser reads Note, Article, Page, Question and media types: content,
  then contentMap, then _misskey_content; summary as the spoiler and name
  as the title; Mention and Hashtag tags; attachments; a PeerTube-style
  list attribution prefers the person over the channel; quote URIs.
- Addressing classifies like Mastodon, finding followers-only by the
  author's own followers URL (now stored on ForeignAvatar), not by a
  "/followers" suffix.
- Create keeps a post when a local persona is addressed or mentioned, when
  it replies to a local post (the parent's reply count goes up) or when a
  community it follows is addressed; an unsolicited public post is not
  stored. Update keeps the previous version as a revision.

The outbox and object endpoints serve only Public and Unlisted posts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB
2026-10-01 11:17:14 +02:00

70 lines
2.2 KiB
C#

using MongoDB.Entities;
using PrivaPub.Federation.Actors;
using PrivaPub.Federation.Objects;
using PrivaPub.Federation.Outbox;
using PrivaPub.Federation.Rendering;
using PrivaPub.Models.Federation;
using PrivaPub.Models.Group;
using PrivaPub.Models.Post;
using PrivaPub.Models.User;
using PrivaPub.StaticServices;
using System.Text.Json.Nodes;
using static PrivaPub.Federation.Inbox.ForeignMembers;
using static PrivaPub.Federation.Objects.ActivityJson;
using PostEntity = PrivaPub.Models.Post.Post;
namespace PrivaPub.Federation.Inbox.Handlers
{
public class UndoHandler : IActivityHandler
{
readonly DbEntities _dbEntities;
readonly ILocalActorService _localActors;
readonly IRemoteActorService _remoteActors;
readonly IDeliveryService _delivery;
public UndoHandler(DbEntities dbEntities, ILocalActorService localActors, IRemoteActorService remoteActors, IDeliveryService delivery)
{
_dbEntities = dbEntities;
_localActors = localActors;
_remoteActors = remoteActors;
_delivery = delivery;
}
public string Type => "Undo";
public async Task Handle(JsonNode activity, ForeignAvatar actor, CancellationToken token)
{
var undo = activity;
var inner = undo["object"];
var innerType = inner is JsonObject ? Value(inner, "type") : default;
var innerId = Id(inner);
if (inner is JsonObject && Id(inner["actor"]) != actor.ActorURI)
return;
if (innerType is not (null or "Follow"))
return;
var followers = await _dbEntities.Followers.Match(f => f.ActorURI == actor.ActorURI).ExecuteAsync(token);
var targetUri = inner is JsonObject ? Id(inner["object"]) : default;
foreach (var follower in followers)
{
var matchesActivity = innerId != default && follower.FollowActivityURI == innerId;
var target = targetUri == default ? default : await _localActors.FindByUri(targetUri, token);
var matchesTarget = target != default && target.Id == follower.LocalActorId && target.Kind == follower.LocalActorKind;
if (!matchesActivity && !matchesTarget)
continue;
await DB.Default.DeleteAsync<Follower>(follower.ID);
if (follower.LocalActorKind == LocalActorKind.Group)
await RemoveForeignMember(follower.LocalActorId, actor.ActorURI, token);
}
return;
}
}
}