3 files changed, 77 insertions, 6 deletions

diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 70db419ca..2470b4a71 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -370,20 +370,38 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
           content: content
         } = params
       ) do
-    additional = params[:additional] || %{}
-
     # only accept false as false value
     local = !(params[:local] == false)
+    forward = !(params[:forward] == false)
 
-    %{
+    additional = params[:additional] || %{}
+
+    params = %{
       actor: actor,
       context: context,
       account: account,
       statuses: statuses,
       content: content
     }
-    |> make_flag_data(additional)
-    |> insert(local)
+
+    additional =
+      if forward do
+        Map.merge(additional, %{"to" => [], "cc" => [account.ap_id]})
+      else
+        Map.merge(additional, %{"to" => [], "cc" => []})
+      end
+
+    with flag_data <- make_flag_data(params, additional),
+         {:ok, activity} <- insert(flag_data, local),
+         :ok <- maybe_federate(activity) do
+      Enum.each(User.all_superusers(), fn superuser ->
+        superuser
+        |> Pleroma.AdminEmail.report(actor, account, statuses, content)
+        |> Pleroma.Mailer.deliver_async()
+      end)
+
+      {:ok, activity}
+    end
   end
 
   def fetch_activities_for_context(context, opts \\ %{}) do
@@ -679,6 +697,18 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
 
   defp restrict_pinned(query, _), do: query
 
+  defp restrict_muted_reblogs(query, %{"muting_user" => %User{info: info}}) do
+    muted_reblogs = info.muted_reblogs || []
+
+    from(
+      activity in query,
+      where: fragment("not ?->>'type' = 'Announce'", activity.data),
+      where: fragment("not ? = ANY(?)", activity.actor, ^muted_reblogs)
+    )
+  end
+
+  defp restrict_muted_reblogs(query, _), do: query
+
   def fetch_activities_query(recipients, opts \\ %{}) do
     base_query =
       from(
@@ -706,6 +736,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
     |> restrict_replies(opts)
     |> restrict_reblogs(opts)
     |> restrict_pinned(opts)
+    |> restrict_muted_reblogs(opts)
   end
 
   def fetch_activities(recipients, opts \\ %{}) do
diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 1247e4b61..8e4bf7b47 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -355,6 +355,40 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
     end
   end
 
+  # Flag objects are placed ahead of the ID check because Mastodon 2.8 and earlier send them
+  # with nil ID.
+  def handle_incoming(%{"type" => "Flag", "object" => objects, "actor" => actor} = data) do
+    with context <- data["context"] || Utils.generate_context_id(),
+         content <- data["content"] || "",
+         %User{} = actor <- User.get_cached_by_ap_id(actor),
+
+         # Reduce the object list to find the reported user.
+         %User{} = account <-
+           Enum.reduce_while(objects, nil, fn ap_id, _ ->
+             with %User{} = user <- User.get_cached_by_ap_id(ap_id) do
+               {:halt, user}
+             else
+               _ -> {:cont, nil}
+             end
+           end),
+
+         # Remove the reported user from the object list.
+         statuses <- Enum.filter(objects, fn ap_id -> ap_id != account.ap_id end) do
+      params = %{
+        actor: actor,
+        context: context,
+        account: account,
+        statuses: statuses,
+        content: content,
+        additional: %{
+          "cc" => [account.ap_id]
+        }
+      }
+
+      ActivityPub.flag(params)
+    end
+  end
+
   # disallow objects with bogus IDs
   def handle_incoming(%{"id" => nil}), do: :error
   def handle_incoming(%{"id" => ""}), do: :error
diff --git a/lib/pleroma/web/activity_pub/utils.ex b/lib/pleroma/web/activity_pub/utils.ex
index 182f9cacb..af317245f 100644
--- a/lib/pleroma/web/activity_pub/utils.ex
+++ b/lib/pleroma/web/activity_pub/utils.ex
@@ -621,7 +621,13 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   #### Flag-related helpers
 
   def make_flag_data(params, additional) do
-    status_ap_ids = Enum.map(params.statuses || [], & &1.data["id"])
+    status_ap_ids =
+      Enum.map(params.statuses || [], fn
+        %Activity{} = act -> act.data["id"]
+        act when is_map(act) -> act["id"]
+        act when is_binary(act) -> act
+      end)
+
     object = [params.account.ap_id] ++ status_ap_ids
 
     %{