From d2919f7e94a22971fb368f614ecccce2b055d231 Mon Sep 17 00:00:00 2001
From: puckipedia <puck@puckipedia.com>
Date: Thu, 24 Oct 2019 20:45:43 +0000
Subject: [PATCH] Allow Accept/Reject with a non-embedded object (#12199)

Some ActivityPub servers refuse to embed remote objects into their own
output. This is because they are not the authoritative source for these
objects, and as such embedding them is always a waste of space. The
follow request and follow models contain a URI, so this can be used to
match them.
---
 app/lib/activitypub/activity.rb        |  8 ++++++++
 app/lib/activitypub/activity/accept.rb |  9 +++++----
 app/lib/activitypub/activity/reject.rb | 10 ++++++----
 3 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/app/lib/activitypub/activity.rb b/app/lib/activitypub/activity.rb
index a4a9baaee..5cd48a6ae 100644
--- a/app/lib/activitypub/activity.rb
+++ b/app/lib/activitypub/activity.rb
@@ -153,6 +153,14 @@ class ActivityPub::Activity
     fetch_remote_original_status
   end
 
+  def follow_request_from_object
+    @follow_request ||= FollowRequest.find_by(target_account: @account, uri: object_uri) unless object_uri.nil?
+  end
+
+  def follow_from_object
+    @follow ||= Follow.find_by(target_account: @account, uri: object_uri) unless object_uri.nil?
+  end
+
   def fetch_remote_original_status
     if object_uri.start_with?('http')
       return if ActivityPub::TagManager.instance.local_uri?(object_uri)
diff --git a/app/lib/activitypub/activity/accept.rb b/app/lib/activitypub/activity/accept.rb
index 348ee0d1c..7010ff43e 100644
--- a/app/lib/activitypub/activity/accept.rb
+++ b/app/lib/activitypub/activity/accept.rb
@@ -2,17 +2,18 @@
 
 class ActivityPub::Activity::Accept < ActivityPub::Activity
   def perform
+    return accept_follow_for_relay if relay_follow?
+    return follow_request_from_object.authorize! unless follow_request_from_object.nil?
+
     case @object['type']
     when 'Follow'
-      accept_follow
+      accept_embedded_follow
     end
   end
 
   private
 
-  def accept_follow
-    return accept_follow_for_relay if relay_follow?
-
+  def accept_embedded_follow
     target_account = account_from_uri(target_uri)
 
     return if target_account.nil? || !target_account.local?
diff --git a/app/lib/activitypub/activity/reject.rb b/app/lib/activitypub/activity/reject.rb
index dba21fb9a..8d771ed81 100644
--- a/app/lib/activitypub/activity/reject.rb
+++ b/app/lib/activitypub/activity/reject.rb
@@ -2,17 +2,19 @@
 
 class ActivityPub::Activity::Reject < ActivityPub::Activity
   def perform
+    return reject_follow_for_relay if relay_follow?
+    return follow_request_from_object.reject! unless follow_request_from_object.nil?
+    return UnfollowService.new.call(follow_from_object.target_account, @account) unless follow_from_object.nil?
+
     case @object['type']
     when 'Follow'
-      reject_follow
+      reject_embedded_follow
     end
   end
 
   private
 
-  def reject_follow
-    return reject_follow_for_relay if relay_follow?
-
+  def reject_embedded_follow
     target_account = account_from_uri(target_uri)
 
     return if target_account.nil? || !target_account.local?