Support TLD wildcards in MRF matches

Fixes #431

lib/pleroma/web/activity_pub/mrf.ex

@@ -161,11 +161,18 @@ defp get_policies(_), do: []
   # - https://extra.baddomain.net/
   # Does NOT match the following:
   # - https://maybebaddomain.net/
+
+  # *.baddomain.net
   def subdomain_regex("*." <> domain), do: subdomain_regex(domain)
 
+  # baddomain.net
   def subdomain_regex(domain) do
+    if String.ends_with?(domain, ".*") do
+      ~r/^(.+\.)?#{Regex.escape(String.replace_suffix(domain, ".*", ""))}\.(.+)$/i
+    else
       ~r/^(.+\.)?#{Regex.escape(domain)}$/i
     end
+  end
 
   @spec subdomains_regex([String.t()]) :: [Regex.t()]
   def subdomains_regex(domains) when is_list(domains) do

test/pleroma/web/activity_pub/mrf_test.exs

@@ -48,6 +48,31 @@ test "wildcard domains with two subdomains" do
       refute MRF.subdomain_match?(regexes, "sub.unsafe.tldanother")
     end
 
+    test "wildcard on the tld" do
+      regexes = MRF.subdomains_regex(["somewhere.*"])
+
+      assert regexes == [~r/^(.+\.)?somewhere\.(.+)$/i]
+
+      assert MRF.subdomain_match?(regexes, "somewhere.net")
+      assert MRF.subdomain_match?(regexes, "somewhere.com")
+      assert MRF.subdomain_match?(regexes, "somewhere.somewherelese.net")
+      refute MRF.subdomain_match?(regexes, "somewhere")
+    end
+
+    test "wildcards on subdomain _and_ tld" do
+      regexes = MRF.subdomains_regex(["*.somewhere.*"])
+
+      assert regexes == [~r/^(.+\.)?somewhere\.(.+)$/i]
+
+      assert MRF.subdomain_match?(regexes, "somewhere.net")
+      assert MRF.subdomain_match?(regexes, "somewhere.com")
+      assert MRF.subdomain_match?(regexes, "sub.somewhere.net")
+      assert MRF.subdomain_match?(regexes, "sub.somewhere.com")
+      assert MRF.subdomain_match?(regexes, "sub.sub.somewhere.net")
+      assert MRF.subdomain_match?(regexes, "sub.sub.somewhere.com")
+      refute MRF.subdomain_match?(regexes, "somewhere")
+    end
+
     test "matches are case-insensitive" do
       regexes = MRF.subdomains_regex(["UnSafe.TLD", "UnSAFE2.Tld"])
 

test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs

@@ -40,7 +40,7 @@ test "a basic note validates", %{note: note} do
     end
 
     test "a note with a language validates" do
-      user = insert(:user, %{ap_id: "https://mastodon.social/users/akkoma_ap_integration_tester"})
+      insert(:user, %{ap_id: "https://mastodon.social/users/akkoma_ap_integration_tester"})
       note = File.read!("test/fixtures/mastodon/note_with_language.json") |> Jason.decode!()
 
       %{