From 80c46d6d8b84d77d86efc32c1d2af225c1eada33 Mon Sep 17 00:00:00 2001
From: Ariadne Conill <ariadne@dereferenced.org>
Date: Sat, 13 Jul 2019 18:30:45 +0000
Subject: [PATCH] nodeinfo: implement MRF transparency exclusions

---
 CHANGELOG.md                                  |  1 +
 config/config.exs                             |  1 +
 docs/config.md                                |  1 +
 .../web/nodeinfo/nodeinfo_controller.ex       |  6 ++-
 test/web/node_info_test.exs                   | 43 +++++++++++++++++++
 5 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index add8a0348..bebb438b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Added
 - MRF: Support for priming the mediaproxy cache (`Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy`)
+- MRF: Support for excluding specific domains from Transparency.
 - Configuration: `federation_incoming_replies_max_depth` option
 - Mastodon API: Support for the [`tagged` filter](https://github.com/tootsuite/mastodon/pull/9755) in [`GET /api/v1/accounts/:id/statuses`](https://docs.joinmastodon.org/api/rest/accounts/#get-api-v1-accounts-id-statuses)
 - Mastodon API, streaming: Add support for passing the token in the `Sec-WebSocket-Protocol` header
diff --git a/config/config.exs b/config/config.exs
index 889238f0f..2ffa8c621 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -240,6 +240,7 @@
     "text/bbcode"
   ],
   mrf_transparency: true,
+  mrf_transparency_exclusions: [],
   autofollowed_nicknames: [],
   max_pinned_statuses: 1,
   no_attachment_links: false,
diff --git a/docs/config.md b/docs/config.md
index 3ec13cff2..639c5689c 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -106,6 +106,7 @@ config :pleroma, Pleroma.Emails.Mailer,
 * `managed_config`: Whenether the config for pleroma-fe is configured in this config or in ``static/config.json``
 * `allowed_post_formats`: MIME-type list of formats allowed to be posted (transformed into HTML)
 * `mrf_transparency`: Make the content of your Message Rewrite Facility settings public (via nodeinfo).
+* `mrf_transparency_exclusions`: Exclude specific instance names from MRF transparency.
 * `scope_copy`: Copy the scope (private/unlisted/public) in replies to posts by default.
 * `subject_line_behavior`: Allows changing the default behaviour of subject lines in replies. Valid values:
   * "email": Copy and preprend re:, as in email.
diff --git a/lib/pleroma/web/nodeinfo/nodeinfo_controller.ex b/lib/pleroma/web/nodeinfo/nodeinfo_controller.ex
index cd9a4f4a8..a1d7fcc7d 100644
--- a/lib/pleroma/web/nodeinfo/nodeinfo_controller.ex
+++ b/lib/pleroma/web/nodeinfo/nodeinfo_controller.ex
@@ -34,8 +34,11 @@ def schemas(conn, _params) do
   def raw_nodeinfo do
     stats = Stats.get_stats()
 
+    exclusions = Config.get([:instance, :mrf_transparency_exclusions])
+
     mrf_simple =
       Config.get(:mrf_simple)
+      |> Enum.map(fn {k, v} -> {k, Enum.reject(v, fn v -> v in exclusions end)} end)
       |> Enum.into(%{})
 
     # This horror is needed to convert regex sigils to strings
@@ -86,7 +89,8 @@ def raw_nodeinfo do
           mrf_simple: mrf_simple,
           mrf_keyword: mrf_keyword,
           mrf_user_allowlist: mrf_user_allowlist,
-          quarantined_instances: quarantined
+          quarantined_instances: quarantined,
+          exclusions: length(exclusions) > 0
         }
       else
         %{}
diff --git a/test/web/node_info_test.exs b/test/web/node_info_test.exs
index be1173513..d7f848bfa 100644
--- a/test/web/node_info_test.exs
+++ b/test/web/node_info_test.exs
@@ -83,4 +83,47 @@ test "it returns the safe_dm_mentions feature if enabled", %{conn: conn} do
 
     Pleroma.Config.put([:instance, :safe_dm_mentions], option)
   end
+
+  test "it shows MRF transparency data if enabled", %{conn: conn} do
+    option = Pleroma.Config.get([:instance, :mrf_transparency])
+    Pleroma.Config.put([:instance, :mrf_transparency], true)
+
+    simple_config = %{"reject" => ["example.com"]}
+    Pleroma.Config.put(:mrf_simple, simple_config)
+
+    response =
+      conn
+      |> get("/nodeinfo/2.1.json")
+      |> json_response(:ok)
+
+    assert response["metadata"]["federation"]["mrf_simple"] == simple_config
+
+    Pleroma.Config.put([:instance, :mrf_transparency], option)
+    Pleroma.Config.put(:mrf_simple, %{})
+  end
+
+  test "it performs exclusions from MRF transparency data if configured", %{conn: conn} do
+    option = Pleroma.Config.get([:instance, :mrf_transparency])
+    Pleroma.Config.put([:instance, :mrf_transparency], true)
+
+    exclusions = Pleroma.Config.get([:instance, :mrf_transparency_exclusions])
+    Pleroma.Config.put([:instance, :mrf_transparency_exclusions], ["other.site"])
+
+    simple_config = %{"reject" => ["example.com", "other.site"]}
+    expected_config = %{"reject" => ["example.com"]}
+
+    Pleroma.Config.put(:mrf_simple, simple_config)
+
+    response =
+      conn
+      |> get("/nodeinfo/2.1.json")
+      |> json_response(:ok)
+
+    assert response["metadata"]["federation"]["mrf_simple"] == expected_config
+    assert response["metadata"]["federation"]["exclusions"] == true
+
+    Pleroma.Config.put([:instance, :mrf_transparency], option)
+    Pleroma.Config.put([:instance, :mrf_transparency_exclusions], exclusions)
+    Pleroma.Config.put(:mrf_simple, %{})
+  end
 end