Files
SocialPub/PrivaPub/Federation/Inbox/Handlers/LikeHandler.cs
T
thepraandClaude Opus 5.5 bbeeda7268 A vote turned the other way replaces the first
Lemmy turns an upvote into a downvote with a Dislike alone (and back with a
Like), so the like stayed counted next to the downvote. Now an account has
one vote on a post: a Dislike takes its like away, a Like its downvote.

The Lemmy scenario's relayed votes were never failing for that reason only:
Lemmy 1.0 sends what it queued every 30 seconds, and the check gave up after
30. It waits a minute now, and both votes are plain checks: 22 pass, the
moderator's removal stays an expected failure (P7).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw
2026-10-05 04:35:23 +02:00

71 lines
2.5 KiB
C#

using MongoDB.Driver;
using MongoDB.Entities;
using PrivaPub.Domain.Privacy;
using PrivaPub.Domain.Social;
using PrivaPub.Models.Post;
using PrivaPub.Models.Social;
using PrivaPub.Models.User;
using PrivaPub.StaticServices;
using System.Text.Json.Nodes;
using static PrivaPub.Federation.Objects.ActivityJson;
using PostEntity = PrivaPub.Models.Post.Post;
namespace PrivaPub.Federation.Inbox.Handlers
{
public class LikeHandler : IActivityHandler
{
readonly DbEntities _dbEntities;
readonly IReactions _reactions;
public LikeHandler(DbEntities dbEntities, IReactions reactions)
{
_dbEntities = dbEntities;
_reactions = reactions;
}
public string Type => "Like";
public async Task Handle(JsonNode activity, ForeignAvatar actor, CancellationToken token)
{
var objectUri = Id(activity["object"]);
var post = objectUri == default
? default
: await _dbEntities.Posts.Match(p => p.ObjectURI == objectUri && !p.DeletedAt.HasValue && p.ReblogOfPostId == null).ExecuteFirstAsync(token);
if (post == default || !await VisibilityPolicy.RemoteCanSee(post, actor, token))
{
Arrival.Drop(post == default ? "unknown-object" : "not-visible");
return;
}
Arrival.About(post.ObjectType ?? "Note", post.Visibility, post.CreationDate);
var content = Value(activity, "_misskey_reaction") ?? Value(activity, "content");
if (!Reactions.IsHeart(content))
{
await _reactions.Receive(post, actor, content, activity["tag"], Id(activity), token);
return;
}
try
{
await DB.Default.SaveAsync(new Favourite { AccountId = actor.ID, ActorURI = actor.ActorURI, PostId = post.ID, ActivityURI = Id(activity) }, token);
}
catch (MongoWriteException ex) when (ex.WriteError?.Category == ServerErrorCategory.DuplicateKey)
{
Arrival.Drop("duplicate");
return;
}
Arrival.Accept("stored");
await DB.Default.Update<PostEntity>().MatchID(post.ID).Modify(b => b.Inc(p => p.FavouritesCount, 1)).ExecuteAsync(token);
// a vote replaces the other one: Lemmy turns a downvote into an upvote with this Like alone
if (await DB.Default.Find<Downvote>().Match(d => d.PostId == post.ID && d.ActorURI == actor.ActorURI).ExecuteFirstAsync(token) is { } downvoted
&& (await DB.Default.DeleteAsync<Downvote>(downvoted.ID)).DeletedCount > 0)
await DB.Default.Update<PostEntity>().MatchID(post.ID).Modify(b => b.Inc(p => p.DownvotesCount, -1)).ExecuteAsync(token);
if (!post.IsFederatedCopy)
await Notifications.Add(post.GroupUserId, NotificationType.Favourite, actor.ID, actor.ActorURI, post.ID, token);
}
}
}