MRF: add describe() to all modules, add base MRF configuration to base describe()

lib/pleroma/web/activity_pub/mrf.ex

@@ -39,15 +39,31 @@ def subdomain_match?(domains, host) do
   @callback describe() :: {:ok | :error, Map.t()}
 
   def describe(policies) do
-    policies
-    |> Enum.reduce({:ok, %{}}, fn
-      policy, {:ok, data} ->
-        {:ok, policy_data} = policy.describe()
-        {:ok, Map.merge(data, policy_data)}
+    {:ok, policy_configs} =
+      policies
+      |> Enum.reduce({:ok, %{}}, fn
+        policy, {:ok, data} ->
+          {:ok, policy_data} = policy.describe()
+          {:ok, Map.merge(data, policy_data)}
 
-      _, error ->
-        error
-    end)
+        _, error ->
+          error
+      end)
+
+    mrf_policies =
+      get_policies()
+      |> Enum.map(fn policy -> to_string(policy) |> String.split(".") |> List.last() end)
+
+    exclusions = Pleroma.Config.get([:instance, :mrf_transparency_exclusions])
+
+    base =
+      %{
+        mrf_policies: mrf_policies,
+        exclusions: length(exclusions) > 0,
+      }
+      |> Map.merge(policy_configs)
+
+    {:ok, base}
   end
 
   def describe(), do: get_policies() |> describe()

lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex

@@ -62,4 +62,7 @@ def filter(%{"type" => "Follow", "actor" => actor_id} = message) do
 
   @impl true
   def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/anti_link_spam_policy.ex

@@ -5,6 +5,8 @@
 defmodule Pleroma.Web.ActivityPub.MRF.AntiLinkSpamPolicy do
   alias Pleroma.User
 
+  @behaviour Pleroma.Web.ActivityPub.MRF
+
   require Logger
 
   # has the user successfully posted before?
@@ -22,6 +24,7 @@ defp contains_links?(%{"content" => content} = _object) do
 
   defp contains_links?(_), do: false
 
+  @impl true
   def filter(%{"type" => "Create", "actor" => actor, "object" => object} = message) do
     with {:ok, %User{} = u} <- User.get_or_fetch_by_ap_id(actor),
          {:contains_links, true} <- {:contains_links, contains_links?(object)},
@@ -45,4 +48,7 @@ def filter(%{"type" => "Create", "actor" => actor, "object" => object} = message
 
   # in all other cases, pass through
   def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/drop_policy.ex

@@ -12,4 +12,7 @@ def filter(object) do
     Logger.info("REJECTING #{inspect(object)}")
     {:reject, object}
   end
+
+  @impl true
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex

@@ -39,4 +39,6 @@ def filter(%{"type" => "Create", "object" => child_object} = object) do
   end
 
   def filter(object), do: {:ok, object}
+
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/hellthread_policy.ex

@@ -90,4 +90,7 @@ def filter(%{"type" => "Create"} = message) do
 
   @impl true
   def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe(), do: {:ok, %{mrf_hellthread: Pleroma.Config.get([:mrf_hellthread])}}
 end

lib/pleroma/web/activity_pub/mrf/keyword_policy.ex

@@ -96,4 +96,36 @@ def filter(%{"type" => "Create", "object" => %{"content" => _content}} = message
 
   @impl true
   def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe() do
+    # This horror is needed to convert regex sigils to strings
+    mrf_keyword =
+      Pleroma.Config.get(:mrf_keyword, [])
+      |> Enum.map(fn {key, value} ->
+        {key,
+         Enum.map(value, fn
+           {pattern, replacement} ->
+             %{
+               "pattern" =>
+                 if not is_binary(pattern) do
+                   inspect(pattern)
+                 else
+                   pattern
+                 end,
+               "replacement" => replacement
+             }
+
+           pattern ->
+             if not is_binary(pattern) do
+               inspect(pattern)
+             else
+               pattern
+             end
+         end)}
+      end)
+      |> Enum.into(%{})
+
+    {:ok, %{mrf_keyword: mrf_keyword}}
+  end
 end

lib/pleroma/web/activity_pub/mrf/mediaproxy_warming_policy.ex

@@ -53,4 +53,7 @@ def filter(
 
   @impl true
   def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/mention_policy.ex

@@ -21,4 +21,7 @@ def filter(%{"type" => "Create"} = message) do
 
   @impl true
   def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex

@@ -19,4 +19,7 @@ def filter(
 
   @impl true
   def filter(object), do: {:ok, object}
+
+  @impl true
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/noop_policy.ex

@@ -10,4 +10,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.NoOpPolicy do
   def filter(object) do
     {:ok, object}
   end
+
+  @impl true
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/normalize_markup.ex

@@ -21,4 +21,6 @@ def filter(%{"type" => "Create", "object" => child_object} = object) do
   end
 
   def filter(object), do: {:ok, object}
+
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/reject_non_public.ex

@@ -44,4 +44,7 @@ def filter(%{"type" => "Create"} = object) do
 
   @impl true
   def filter(object), do: {:ok, object}
+
+  @impl true
+  def describe(), do: {:ok, %{mrf_rejectnonpublic: Pleroma.Config.get([:mrf_rejectnonpublic])}}
 end

lib/pleroma/web/activity_pub/mrf/simple_policy.ex

@@ -177,4 +177,16 @@ def filter(%{"id" => actor, "type" => obj_type} = object)
   end
 
   def filter(object), do: {:ok, object}
+
+  @impl true
+  def describe() do
+    exclusions = Pleroma.Config.get([:instance, :mrf_transparency_exclusions])
+
+    mrf_simple =
+      Pleroma.Config.get(:mrf_simple)
+      |> Enum.map(fn {k, v} -> {k, Enum.reject(v, fn v -> v in exclusions end)} end)
+      |> Enum.into(%{})
+
+    {:ok, %{mrf_simple: mrf_simple}}
+  end
 end

lib/pleroma/web/activity_pub/mrf/subchain_policy.ex

@@ -37,4 +37,7 @@ def filter(%{"actor" => actor} = message) do
 
   @impl true
   def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/tag_policy.ex

@@ -165,4 +165,7 @@ def filter(%{"actor" => actor, "type" => "Create"} = message),
 
   @impl true
   def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe(), do: {:ok, %{}}
 end

lib/pleroma/web/activity_pub/mrf/user_allowlist_policy.ex

@@ -32,4 +32,13 @@ def filter(%{"actor" => actor} = object) do
   end
 
   def filter(object), do: {:ok, object}
+
+  @impl true
+  def describe() do
+    mrf_user_allowlist =
+      Config.get([:mrf_user_allowlist], [])
+      |> Enum.into(%{}, fn {k, v} -> {k, length(v)} end)
+
+    {:ok, %{mrf_user_allowlist: mrf_user_allowlist}}
+  end
 end