48 lines
1.6 KiB
C#
48 lines
1.6 KiB
C#
 
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using PrivaPub.Federation.Actors;
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using PrivaPub.Federation.Rendering;
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.Json.Nodes;
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namespace PrivaPub.Federation.Outbox
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{
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public interface IGroupDistributor
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{
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Task Announce(LocalActor group, JsonObject activity, string objectUri, bool isNewPost, CancellationToken token);
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}
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public class GroupDistributor : IGroupDistributor
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{
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readonly IDeliveryService _delivery;
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public GroupDistributor(IDeliveryService delivery)
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{
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_delivery = delivery;
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}
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public async Task Announce(LocalActor group, JsonObject activity, string objectUri, bool isNewPost, CancellationToken token)
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{
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if (group is not { IsCircle: false, Kind: Models.Federation.LocalActorKind.Group })
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return;
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var embedded = (JsonObject)activity.DeepClone();
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embedded.Remove("@context");
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embedded["audience"] ??= group.Uri;
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var key = Convert.ToHexStringLower(SHA256.HashData(Encoding.UTF8.GetBytes(activity["id"]?.GetValue<string>() ?? embedded.ToJsonString())))[..24];
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var announce = new JsonObject
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{
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["@context"] = ActivityPubRenderer.Context(),
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["id"] = group.ActivityUri($"announce-{key}"),
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["type"] = "Announce",
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["actor"] = group.Uri,
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["to"] = new JsonArray(ActivityPubRenderer.Public),
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["cc"] = new JsonArray(group.Followers),
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["audience"] = group.Uri,
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["object"] = embedded
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};
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await _delivery.EnqueueToFollowers(group, announce, token);
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if (isNewPost && !string.IsNullOrEmpty(objectUri))
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await _delivery.EnqueueToFollowers(group, ActivityPubRenderer.Announce(group, objectUri, $"announce-object-{key}"), token);
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}
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}
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}
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