Merge branch 'feature/1631-redesign-mrf-configuration' into 'develop'

Moving mrf settings from instance to separate mrf group

Closes #1631

See merge request pleroma/pleroma!2320

priv/repo/migrations/20200323122421_mrf_config_move_from_instance_namespace.exs

@@ -0,0 +1,39 @@
+defmodule Pleroma.Repo.Migrations.MrfConfigMoveFromInstanceNamespace do
+  use Ecto.Migration
+
+  alias Pleroma.ConfigDB
+
+  @old_keys [:rewrite_policy, :mrf_transparency, :mrf_transparency_exclusions]
+  def change do
+    config = ConfigDB.get_by_params(%{group: ":pleroma", key: ":instance"})
+
+    if config do
+      old_instance = ConfigDB.from_binary(config.value)
+
+      mrf =
+        old_instance
+        |> Keyword.take(@old_keys)
+        |> Keyword.new(fn
+          {:rewrite_policy, policies} -> {:policies, policies}
+          {:mrf_transparency, transparency} -> {:transparency, transparency}
+          {:mrf_transparency_exclusions, exclusions} -> {:transparency_exclusions, exclusions}
+        end)
+
+      if mrf != [] do
+        {:ok, _} =
+          ConfigDB.create(
+            %{group: ":pleroma", key: ":mrf", value: ConfigDB.to_binary(mrf)},
+            false
+          )
+
+        new_instance = Keyword.drop(old_instance, @old_keys)
+
+        if new_instance != [] do
+          {:ok, _} = ConfigDB.update(config, %{value: ConfigDB.to_binary(new_instance)}, false)
+        else
+          {:ok, _} = ConfigDB.delete(config)
+        end
+      end
+    end
+  end
+end