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Forwarded activities are believed as far as their origin vouches

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A thread's server passes on what happens in it, signed with its own key: Mastodon forwards the replies to its
accounts' posts and their deletions, Friendica every activity in its threads. PrivaPub answered them 401, which also
tells a sender its signature failed. Now they get 202 and nothing in them is believed: a forwarded Create or Update is
taken as its object reads at the actor's origin, a Delete of a public or unlisted copy once that origin answers 404 or
410 (RemoteActorService.IsGone; FederationHttp remembers the status of a refusal), anything else is let go, and our own
activities coming back are ignored. A forwarded copy has its own dedupe key, so one that failed never hides the
author's own delivery.

A reply in the thread of someone followed here is kept, as Mastodon keeps them. Mastodon delivers a reply to the
followers of the account it answers; PrivaPub dropped those as unaddressed, which the pasture showed: the outsider's
reply its Mastodon scenario said was never delivered had been, and was thrown away.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw
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thepraandClaude Opus 5.5 committed 2026-10-05 09:34:08 +02:00
1 parent 01808fa644
commit 7eb7c017a5
12 files changed
+334 -21
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PrivaPub/Federation/Inbox/Handlers/CreateHandler.cs
+4 -1
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@@ -145,7 +145,10 @@ namespace PrivaPub.Federation.Inbox.Handlers
var followed = visibility != PostVisibility.Direct && await _dbEntities.Followings
.Match(f => f.TargetActorURI == author.ActorURI && f.State == FollowState.Accepted)
.ExecuteAnyAsync(token);
if (visibility == PostVisibility.Direct ? persons.Count == 0 : group == default && persons.Count == 0 && !repliesToLocal && !followed)
// a reply in the thread of someone followed here, as Mastodon keeps them: what the thread's server forwards
var repliesToFollowed = !followed && parent is { IsFederatedCopy: true } && visibility is PostVisibility.Public or PostVisibility.Unlisted
&& await _dbEntities.Followings.Match(f => f.TargetActorURI == parent.ActorURI && f.State == FollowState.Accepted).ExecuteAnyAsync(token);
if (visibility == PostVisibility.Direct ? persons.Count == 0 : group == default && persons.Count == 0 && !repliesToLocal && !followed && !repliesToFollowed)
{
Arrival.Drop("not-addressed");
return;