MRF Policies: Return a {:reject, reason} instead of {:reject, nil}

test/web/activity_pub/mrf/anti_followbot_policy_test.exs

@@ -21,7 +21,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.AntiFollowbotPolicyTest do
         "id" => "https://example.com/activities/1234"
       }
 
-      {:reject, nil} = AntiFollowbotPolicy.filter(message)
+      assert {:reject, "[AntiFollowbotPolicy]" <> _} = AntiFollowbotPolicy.filter(message)
     end
 
     test "matches followbots by display name" do
@@ -36,7 +36,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.AntiFollowbotPolicyTest do
         "id" => "https://example.com/activities/1234"
       }
 
-      {:reject, nil} = AntiFollowbotPolicy.filter(message)
+      assert {:reject, "[AntiFollowbotPolicy]" <> _} = AntiFollowbotPolicy.filter(message)
     end
   end
 

test/web/activity_pub/mrf/hellthread_policy_test.exs

@@ -50,7 +50,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.HellthreadPolicyTest do
     } do
       Pleroma.Config.put([:mrf_hellthread], %{delist_threshold: 0, reject_threshold: 2})
 
-      {:reject, nil} = filter(message)
+      assert {:reject, "[HellthreadPolicy] 3 recipients is over the limit of 2"} ==
+               filter(message)
     end
 
     test "does not reject the message if the recipient count is below reject_threshold", %{

test/web/activity_pub/mrf/keyword_policy_test.exs

@@ -25,7 +25,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicyTest do
         }
       }
 
-      assert {:reject, nil} == KeywordPolicy.filter(message)
+      assert {:reject, "[KeywordPolicy] Matches with rejected keyword"} =
+               KeywordPolicy.filter(message)
     end
 
     test "rejects if string matches in summary" do
@@ -39,7 +40,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicyTest do
         }
       }
 
-      assert {:reject, nil} == KeywordPolicy.filter(message)
+      assert {:reject, "[KeywordPolicy] Matches with rejected keyword"} =
+               KeywordPolicy.filter(message)
     end
 
     test "rejects if regex matches in content" do
@@ -55,7 +57,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicyTest do
                    }
                  }
 
-                 {:reject, nil} == KeywordPolicy.filter(message)
+                 {:reject, "[KeywordPolicy] Matches with rejected keyword"} ==
+                   KeywordPolicy.filter(message)
                end)
     end
 
@@ -72,7 +75,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicyTest do
                    }
                  }
 
-                 {:reject, nil} == KeywordPolicy.filter(message)
+                 {:reject, "[KeywordPolicy] Matches with rejected keyword"} ==
+                   KeywordPolicy.filter(message)
                end)
     end
   end

test/web/activity_pub/mrf/mention_policy_test.exs

@@ -76,7 +76,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.MentionPolicyTest do
         "to" => ["https://example.com/blocked"]
       }
 
-      assert MentionPolicy.filter(message) == {:reject, nil}
+      assert MentionPolicy.filter(message) ==
+               {:reject, "[MentionPolicy] Rejected for mention of https://example.com/blocked"}
     end
 
     test "cc" do
@@ -88,7 +89,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.MentionPolicyTest do
         "cc" => ["https://example.com/blocked"]
       }
 
-      assert MentionPolicy.filter(message) == {:reject, nil}
+      assert MentionPolicy.filter(message) ==
+               {:reject, "[MentionPolicy] Rejected for mention of https://example.com/blocked"}
     end
   end
 end

test/web/activity_pub/mrf/reject_non_public_test.exs

@@ -64,7 +64,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.RejectNonPublicTest do
       }
 
       Pleroma.Config.put([:mrf_rejectnonpublic, :allow_followersonly], false)
-      assert {:reject, nil} = RejectNonPublic.filter(message)
+      assert {:reject, _} = RejectNonPublic.filter(message)
     end
   end
 
@@ -94,7 +94,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.RejectNonPublicTest do
       }
 
       Pleroma.Config.put([:mrf_rejectnonpublic, :allow_direct], false)
-      assert {:reject, nil} = RejectNonPublic.filter(message)
+      assert {:reject, _} = RejectNonPublic.filter(message)
     end
   end
 end

test/web/activity_pub/mrf/simple_policy_test.exs

@@ -124,7 +124,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
       report_message = build_report_message()
       local_message = build_local_message()
 
-      assert SimplePolicy.filter(report_message) == {:reject, nil}
+      assert {:reject, _} = SimplePolicy.filter(report_message)
       assert SimplePolicy.filter(local_message) == {:ok, local_message}
     end
 
@@ -133,7 +133,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
       report_message = build_report_message()
       local_message = build_local_message()
 
-      assert SimplePolicy.filter(report_message) == {:reject, nil}
+      assert {:reject, _} = SimplePolicy.filter(report_message)
       assert SimplePolicy.filter(local_message) == {:ok, local_message}
     end
   end
@@ -241,7 +241,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
 
       remote_message = build_remote_message()
 
-      assert SimplePolicy.filter(remote_message) == {:reject, nil}
+      assert {:reject, _} = SimplePolicy.filter(remote_message)
     end
 
     test "activity matches with wildcard domain" do
@@ -249,7 +249,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
 
       remote_message = build_remote_message()
 
-      assert SimplePolicy.filter(remote_message) == {:reject, nil}
+      assert {:reject, _} = SimplePolicy.filter(remote_message)
     end
 
     test "actor has a matching host" do
@@ -257,7 +257,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
 
       remote_user = build_remote_user()
 
-      assert SimplePolicy.filter(remote_user) == {:reject, nil}
+      assert {:reject, _} = SimplePolicy.filter(remote_user)
     end
   end
 
@@ -279,7 +279,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
       remote_message = build_remote_message()
 
       assert SimplePolicy.filter(local_message) == {:ok, local_message}
-      assert SimplePolicy.filter(remote_message) == {:reject, nil}
+      assert {:reject, _} = SimplePolicy.filter(remote_message)
     end
 
     test "activity has a matching host" do
@@ -429,7 +429,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
     test "it rejects the deletion" do
       deletion_message = build_remote_deletion_message()
 
-      assert SimplePolicy.filter(deletion_message) == {:reject, nil}
+      assert {:reject, _} = SimplePolicy.filter(deletion_message)
     end
   end
 
@@ -439,7 +439,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
     test "it rejects the deletion" do
       deletion_message = build_remote_deletion_message()
 
-      assert SimplePolicy.filter(deletion_message) == {:reject, nil}
+      assert {:reject, _} = SimplePolicy.filter(deletion_message)
     end
   end
 

test/web/activity_pub/mrf/tag_policy_test.exs

@@ -12,8 +12,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicyTest do
   describe "mrf_tag:disable-any-subscription" do
     test "rejects message" do
       actor = insert(:user, tags: ["mrf_tag:disable-any-subscription"])
-      message = %{"object" => actor.ap_id, "type" => "Follow"}
-      assert {:reject, nil} = TagPolicy.filter(message)
+      message = %{"object" => actor.ap_id, "type" => "Follow", "actor" => actor.ap_id}
+      assert {:reject, _} = TagPolicy.filter(message)
     end
   end
 
@@ -22,7 +22,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.TagPolicyTest do
       actor = insert(:user, tags: ["mrf_tag:disable-remote-subscription"])
       follower = insert(:user, tags: ["mrf_tag:disable-remote-subscription"], local: false)
       message = %{"object" => actor.ap_id, "type" => "Follow", "actor" => follower.ap_id}
-      assert {:reject, nil} = TagPolicy.filter(message)
+      assert {:reject, _} = TagPolicy.filter(message)
     end
 
     test "allows non-local follow requests" do

test/web/activity_pub/mrf/user_allowlist_policy_test.exs

@@ -26,6 +26,6 @@ defmodule Pleroma.Web.ActivityPub.MRF.UserAllowListPolicyTest do
     actor = insert(:user)
     Pleroma.Config.put([:mrf_user_allowlist], %{"localhost" => ["test-ap-id"]})
     message = %{"actor" => actor.ap_id}
-    assert UserAllowListPolicy.filter(message) == {:reject, nil}
+    assert {:reject, _} = UserAllowListPolicy.filter(message)
   end
 end

test/web/activity_pub/mrf/vocabulary_policy_test.exs

@@ -46,7 +46,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.VocabularyPolicyTest do
         }
       }
 
-      {:reject, nil} = VocabularyPolicy.filter(message)
+      {:reject, _} = VocabularyPolicy.filter(message)
     end
 
     test "it does not accept disallowed parent types" do
@@ -60,7 +60,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.VocabularyPolicyTest do
         }
       }
 
-      {:reject, nil} = VocabularyPolicy.filter(message)
+      {:reject, _} = VocabularyPolicy.filter(message)
     end
   end
 
@@ -75,7 +75,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.VocabularyPolicyTest do
         "object" => "whatever"
       }
 
-      {:reject, nil} = VocabularyPolicy.filter(message)
+      {:reject, _} = VocabularyPolicy.filter(message)
     end
 
     test "it rejects based on child object type" do
@@ -89,7 +89,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.VocabularyPolicyTest do
         }
       }
 
-      {:reject, nil} = VocabularyPolicy.filter(message)
+      {:reject, _} = VocabularyPolicy.filter(message)
     end
 
     test "it passes through objects that aren't disallowed" do