Add tests and fix a typo in docs

docs/config.md

@@ -174,7 +174,7 @@ This section is used to configure Pleroma-FE, unless ``:managed_config`` in ``:i
 ## :mrf_keyword
 * `reject`: A list of patterns which result in message being rejected, each pattern can be a string or a [regular expression](https://hexdocs.pm/elixir/Regex.html)
 * `federated_timeline_removal`: A list of patterns which result in message being removed from federated timelines (a.k.a unlisted), each pattern can be a string or a [regular expression](https://hexdocs.pm/elixir/Regex.html)
-* `replace`: A list of tuples containing `{pattern, replacement`, `pattern` can be a string or a [regular expression](https://hexdocs.pm/elixir/Regex.html)
+* `replace`: A list of tuples containing `{pattern, replacement}`, `pattern` can be a string or a [regular expression](https://hexdocs.pm/elixir/Regex.html)
 
 ## :media_proxy
 * `enabled`: Enables proxying of remote media to the instance’s proxy

test/web/activity_pub/mrf/keyword_policy_test.exs

+# Pleroma: A lightweight social networking server
+# Copyright © 2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicyTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Web.ActivityPub.MRF.KeywordPolicy
+
+  setup do
+    Pleroma.Config.put([:mrf_keyword], %{reject: [], federated_timeline_removal: [], replace: []})
+  end
+
+  describe "rejecting based on keywords" do
+    test "rejects if string matches" do
+      Pleroma.Config.put([:mrf_keyword, :reject], ["pun"])
+
+      message = %{
+        "type" => "Create",
+        "object" => %{"content" => "just a daily reminder that compLAINer is a good pun"}
+      }
+
+      assert {:reject, nil} == KeywordPolicy.filter(message)
+    end
+
+    test "rejects if regex matches" do
+      Pleroma.Config.put([:mrf_keyword, :reject], [~r/comp[lL][aA][iI][nN]er/])
+
+      assert true ==
+               Enum.all?(["complainer", "compLainer", "compLAiNer", "compLAINer"], fn content ->
+                 message = %{
+                   "type" => "Create",
+                   "object" => %{
+                     "content" => "just a daily reminder that #{content} is a good pun"
+                   }
+                 }
+
+                 {:reject, nil} == KeywordPolicy.filter(message)
+               end)
+    end
+  end
+
+  describe "delisting from ftl based on keywords" do
+    test "delists if string matches" do
+      Pleroma.Config.put([:mrf_keyword, :federated_timeline_removal], ["pun"])
+
+      message = %{
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "type" => "Create",
+        "object" => %{"content" => "just a daily reminder that compLAINer is a good pun"}
+      }
+
+      {:ok, result} = KeywordPolicy.filter(message)
+      assert ["https://www.w3.org/ns/activitystreams#Public"] == result["cc"]
+      refute ["https://www.w3.org/ns/activitystreams#Public"] == result["to"]
+    end
+
+    test "delists if regex matches" do
+      Pleroma.Config.put([:mrf_keyword, :federated_timeline_removal], [~r/comp[lL][aA][iI][nN]er/])
+
+      assert true ==
+               Enum.all?(["complainer", "compLainer", "compLAiNer", "compLAINer"], fn content ->
+                 message = %{
+                   "type" => "Create",
+                   "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+                   "object" => %{
+                     "content" => "just a daily reminder that #{content} is a good pun"
+                   }
+                 }
+
+                 {:ok, result} = KeywordPolicy.filter(message)
+
+                 ["https://www.w3.org/ns/activitystreams#Public"] == result["cc"] and
+                   not (["https://www.w3.org/ns/activitystreams#Public"] == result["to"])
+               end)
+    end
+  end
+
+  describe "replacing keywords" do
+    test "replaces keyword if string matches" do
+      Pleroma.Config.put([:mrf_keyword, :replace], [{"opensource", "free software"}])
+
+      message = %{
+        "type" => "Create",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "object" => %{"content" => "ZFS is opensource"}
+      }
+
+      {:ok, %{"object" => %{"content" => result}}} = KeywordPolicy.filter(message)
+      assert result == "ZFS is free software"
+    end
+
+    test "replaces keyword if regex matches" do
+      Pleroma.Config.put([:mrf_keyword, :replace], [
+        {~r/open(-|\s)?source\s?(software)?/, "free software"}
+      ])
+
+      assert true ==
+               Enum.all?(["opensource", "open-source", "open source"], fn content ->
+                 message = %{
+                   "type" => "Create",
+                   "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+                   "object" => %{"content" => "ZFS is #{content}"}
+                 }
+
+                 {:ok, %{"object" => %{"content" => result}}} = KeywordPolicy.filter(message)
+                 IO.inspect(content)
+                 IO.inspect(result)
+                 result == "ZFS is free software"
+               end)
+    end
+  end
+end