Handle ActivityPub follows correctly (#4571)

* Handle ActivityPub follows correctly

ActivityPub follows are follow-requests. Always require an Accept.
If account is not locked, auto-accept.

* Handle ActivityPub Accept/Reject-Follow

* Fix wrong method

* Fix wrong class

3 files changed, 58 insertions, 2 deletions

diff --git a/app/lib/activitypub/activity/accept.rb b/app/lib/activitypub/activity/accept.rb
new file mode 100644
index 000000000..f5880937a
--- /dev/null
+++ b/app/lib/activitypub/activity/accept.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class ActivityPub::Activity::Accept < ActivityPub::Activity
+  def perform
+    case @object['type']
+    when 'Follow'
+      accept_follow
+    end
+  end
+
+  private
+
+  def accept_follow
+    target_account = account_from_uri(target_uri)
+
+    return if target_account.nil? || !target_account.local?
+
+    follow_request = FollowRequest.find_by(account: target_account, target_account: @account)
+    follow_request&.authorize!
+  end
+
+  def target_uri
+    @target_uri ||= @object['object'].is_a?(String) ? @object['object'] : @object['object']['id']
+  end
+end
diff --git a/app/lib/activitypub/activity/follow.rb b/app/lib/activitypub/activity/follow.rb
index 7918b5108..3fb698d1d 100644
--- a/app/lib/activitypub/activity/follow.rb
+++ b/app/lib/activitypub/activity/follow.rb
@@ -6,7 +6,13 @@ class ActivityPub::Activity::Follow < ActivityPub::Activity
 
     return if target_account.nil? || !target_account.local? || delete_arrived_first?(@json['id'])
 
-    follow = @account.follow!(target_account)
-    NotifyService.new.call(target_account, follow)
+    follow_request = FollowRequest.create!(account: @account, target_account: target_account)
+
+    if target_account.locked?
+      NotifyService.new.call(target_account, follow_request)
+    else
+      AuthorizeFollowService.new.call(@account, target_account)
+      NotifyService.new.call(target_account, ::Follow.find_by(account: @account, target_account: target_account))
+    end
   end
 end
diff --git a/app/lib/activitypub/activity/reject.rb b/app/lib/activitypub/activity/reject.rb
new file mode 100644
index 000000000..78dbfd1e5
--- /dev/null
+++ b/app/lib/activitypub/activity/reject.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class ActivityPub::Activity::Reject < ActivityPub::Activity
+  def perform
+    case @object['type']
+    when 'Follow'
+      reject_follow
+    end
+  end
+
+  private
+
+  def reject_follow
+    target_account = account_from_uri(target_uri)
+
+    return if target_account.nil? || !target_account.local?
+
+    follow_request = FollowRequest.find_by(account: target_account, target_account: @account)
+    follow_request&.reject!
+  end
+
+  def target_uri
+    @target_uri ||= @object['object'].is_a?(String) ? @object['object'] : @object['object']['id']
+  end
+end