Gab Social. All are welcome.

app/services/unfollow_service.rb

@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+class UnfollowService < BaseService
+  # Unfollow and notify the remote user
+  # @param [Account] source_account Where to unfollow from
+  # @param [Account] target_account Which to unfollow
+  def call(source_account, target_account)
+    @source_account = source_account
+    @target_account = target_account
+
+    unfollow! || undo_follow_request!
+  end
+
+  private
+
+  def unfollow!
+    follow = Follow.find_by(account: @source_account, target_account: @target_account)
+
+    return unless follow
+
+    follow.destroy!
+    create_notification(follow) unless @target_account.local?
+    create_reject_notification(follow) if @target_account.local? && !@source_account.local?
+    UnmergeWorker.perform_async(@target_account.id, @source_account.id)
+    follow
+  end
+
+  def undo_follow_request!
+    follow_request = FollowRequest.find_by(account: @source_account, target_account: @target_account)
+
+    return unless follow_request
+
+    follow_request.destroy!
+    create_notification(follow_request) unless @target_account.local?
+    follow_request
+  end
+
+  def create_notification(follow)
+    if follow.target_account.ostatus?
+      NotificationWorker.perform_async(build_xml(follow), follow.account_id, follow.target_account_id)
+    elsif follow.target_account.activitypub?
+      ActivityPub::DeliveryWorker.perform_async(build_json(follow), follow.account_id, follow.target_account.inbox_url)
+    end
+  end
+
+  def create_reject_notification(follow)
+    # Rejecting an already-existing follow request
+    return unless follow.account.activitypub?
+    ActivityPub::DeliveryWorker.perform_async(build_reject_json(follow), follow.target_account_id, follow.account.inbox_url)
+  end
+
+  def build_json(follow)
+    ActiveModelSerializers::SerializableResource.new(
+      follow,
+      serializer: ActivityPub::UndoFollowSerializer,
+      adapter: ActivityPub::Adapter
+    ).to_json
+  end
+
+  def build_reject_json(follow)
+    ActiveModelSerializers::SerializableResource.new(
+      follow,
+      serializer: ActivityPub::RejectFollowSerializer,
+      adapter: ActivityPub::Adapter
+    ).to_json
+  end
+
+  def build_xml(follow)
+    OStatus::AtomSerializer.render(OStatus::AtomSerializer.new.unfollow_salmon(follow))
+  end
+end