Add RemoteReportPolicy to reject reports without enough information

test/pleroma/web/activity_pub/mrf/remote_report_policy_test.exs

@@ -0,0 +1,85 @@
+defmodule Pleroma.Web.ActivityPub.MRF.RemoteReportPolicyTest do
+  use Pleroma.DataCase, async: true
+
+  alias Pleroma.Web.ActivityPub.MRF.RemoteReportPolicy
+
+  test "doesn't impact local report" do
+    clear_config([:mrf_remote_report, :reject_anonymous], true)
+    clear_config([:mrf_remote_report, :reject_empty_message], true)
+
+    activity = %{
+      "type" => "Flag",
+      "actor" => "http://localhost:4001/actor"
+    }
+
+    assert {:ok, _} = RemoteReportPolicy.filter(activity)
+  end
+
+  test "rejects anonymous report if `reject_anonymous: true`" do
+    clear_config([:mrf_remote_report, :reject_anonymous], true)
+
+    activity = %{
+      "type" => "Flag",
+      "actor" => "https://mastodon.social/actor"
+    }
+
+    assert {:reject, _} = RemoteReportPolicy.filter(activity)
+  end
+
+  test "preserves anonymous report if `reject_anonymous: false`" do
+    clear_config([:mrf_remote_report, :reject_anonymous], false)
+
+    activity = %{
+      "type" => "Flag",
+      "actor" => "https://mastodon.social/actor"
+    }
+
+    assert {:ok, _} = RemoteReportPolicy.filter(activity)
+  end
+
+  test "rejects empty message report if `reject_empty_message: true`" do
+    clear_config([:mrf_remote_report, :reject_empty_message], true)
+
+    activity = %{
+      "type" => "Flag",
+      "actor" => "https://mastodon.social/users/Gargron"
+    }
+
+    assert {:reject, _} = RemoteReportPolicy.filter(activity)
+  end
+
+  test "rejects empty message report (\"\") if `reject_empty_message: true`" do
+    clear_config([:mrf_remote_report, :reject_empty_message], true)
+
+    activity = %{
+      "type" => "Flag",
+      "actor" => "https://mastodon.social/users/Gargron",
+      "content" => ""
+    }
+
+    assert {:reject, _} = RemoteReportPolicy.filter(activity)
+  end
+
+  test "preserves empty message report if `reject_empty_message: false`" do
+    clear_config([:mrf_remote_report, :reject_empty_message], false)
+
+    activity = %{
+      "type" => "Flag",
+      "actor" => "https://mastodon.social/users/Gargron"
+    }
+
+    assert {:ok, _} = RemoteReportPolicy.filter(activity)
+  end
+
+  test "preserves anonymous, empty message report with all settings disabled" do
+    clear_config([:mrf_remote_report, :reject_empty_message], false)
+    clear_config([:mrf_remote_report, :reject_empty_message], false)
+
+    activity = %{
+      "type" => "Flag",
+      "actor" => "https://mastodon.social/actor"
+    }
+
+    assert {:ok, _} = RemoteReportPolicy.filter(activity)
+  end
+end