86 lines
3.0 KiB
C#
86 lines
3.0 KiB
C#
 
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using MongoDB.Entities;
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using PrivaPub.Domain.Social;
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using PrivaPub.Federation.Actors;
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using PrivaPub.Models.Federation;
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using PrivaPub.Models.Social;
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using PrivaPub.Models.User;
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using PrivaPub.StaticServices;
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using System.Text.Json.Nodes;
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using static PrivaPub.Federation.Objects.ActivityJson;
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namespace PrivaPub.Federation.Inbox.Handlers
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{
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// Lemmy 1.0's warning: a community's moderator tells one of our personas, about one of its posts there, why (Warn{to:
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// [persona], object: post, summary: reason, audience: community}), sent to the persona's inbox alone. It becomes the
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// persona's moderation_warning notification, once the sender is shown to moderate that community and the post is the
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// persona's own, in it.
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public class WarnHandler : IActivityHandler
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{
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const int MaxReason = 1000;
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readonly DbEntities _dbEntities;
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readonly ILocalActorService _localActors;
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readonly IRemoteActorService _remoteActors;
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public WarnHandler(DbEntities dbEntities, ILocalActorService localActors, IRemoteActorService remoteActors)
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{
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_dbEntities = dbEntities;
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_localActors = localActors;
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_remoteActors = remoteActors;
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}
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public string Type => "Warn";
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public async Task Handle(JsonNode activity, ForeignAvatar actor, CancellationToken token)
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{
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LocalActor persona = default;
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foreach (var uri in Recipients(activity["to"]))
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if (await _localActors.FindByUri(uri, token) is { Kind: LocalActorKind.Person } found)
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{
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persona = found;
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break;
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}
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if (persona == default)
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{
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Arrival.Drop("not-ours");
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return;
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}
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var communityUri = Id(activity["audience"]);
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var community = communityUri == default ? default : await _remoteActors.GetActor(communityUri, refresh: false, token);
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if (community is not { AvatarType: AvatarType.Group })
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{
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Arrival.Drop("unknown-community");
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return;
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}
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var objectUri = Id(activity["object"]);
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var post = objectUri == default
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? default
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: await _dbEntities.Posts.Match(p => p.ObjectURI == objectUri && p.GroupUserId == persona.Id && !p.IsFederatedCopy).ExecuteFirstAsync(token);
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if (post == default || await Communities.Of(post, _dbEntities, token) != community.ActorURI)
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{
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Arrival.Drop("unknown-object");
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return;
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}
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Arrival.About(visibility: post.Visibility, created: post.CreationDate, local: persona);
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if (!await Communities.Moderates(community, actor.ActorURI, _remoteActors, token))
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{
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Arrival.Drop("not-moderator");
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return;
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}
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var reason = Value(activity, "summary") ?? Value(activity, "content");
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await Notifications.Add(persona.Id, NotificationType.ModerationWarning, community.ID, community.ActorURI, post.ID, token,
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text: string.IsNullOrWhiteSpace(reason) ? default : reason.Trim().Length <= MaxReason ? reason.Trim() : reason.Trim()[..MaxReason]);
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Arrival.Accept("warned");
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}
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static IEnumerable<string> Recipients(JsonNode node) => node switch
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{
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JsonArray array => array.Select(Id).Where(id => id != default),
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JsonNode single when Id(single) is { } id => new[] { id },
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_ => Enumerable.Empty<string>()
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};
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}
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}
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