From 179293e51c2e381fdc15c0a291b735750f9cd656 Mon Sep 17 00:00:00 2001
From: William Pitcock <nenolod@dereferenced.org>
Date: Sun, 12 May 2019 04:27:01 +0000
Subject: [PATCH] salmon: refactor to work as a federator publishing module

---
 config/config.exs                      |  3 ++-
 lib/pleroma/web/federator/federator.ex | 12 ---------
 lib/pleroma/web/salmon/salmon.ex       | 34 +++++++++++++++++---------
 3 files changed, 24 insertions(+), 25 deletions(-)

diff --git a/config/config.exs b/config/config.exs
index 37803383a..3dcff3c46 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -213,7 +213,8 @@
   federating: true,
   federation_reachability_timeout_days: 7,
   federation_publisher_modules: [
-    Pleroma.Web.ActivityPub.Publisher
+    Pleroma.Web.ActivityPub.Publisher,
+    Pleroma.Web.Salmon
   ],
   allow_relay: true,
   rewrite_policy: Pleroma.Web.ActivityPub.MRF.NoOpPolicy,
diff --git a/lib/pleroma/web/federator/federator.ex b/lib/pleroma/web/federator/federator.ex
index 252d3b009..c9b245933 100644
--- a/lib/pleroma/web/federator/federator.ex
+++ b/lib/pleroma/web/federator/federator.ex
@@ -13,7 +13,6 @@ defmodule Pleroma.Web.Federator do
   alias Pleroma.Web.Federator.Publisher
   alias Pleroma.Web.Federator.RetryQueue
   alias Pleroma.Web.OStatus
-  alias Pleroma.Web.Salmon
   alias Pleroma.Web.WebFinger
   alias Pleroma.Web.Websub
 
@@ -58,10 +57,6 @@ def refresh_subscriptions do
     PleromaJobQueue.enqueue(:federator_outgoing, __MODULE__, [:refresh_subscriptions])
   end
 
-  def publish_single_salmon(params) do
-    PleromaJobQueue.enqueue(:federator_outgoing, __MODULE__, [:publish_single_salmon, params])
-  end
-
   # Job Worker Callbacks
 
   def perform(:refresh_subscriptions) do
@@ -95,9 +90,6 @@ def perform(:publish, activity) do
         if OStatus.is_representable?(activity) do
           Logger.info(fn -> "Sending #{activity.data["id"]} out via WebSub" end)
           Websub.publish(Pleroma.Web.OStatus.feed_path(actor), actor, activity)
-
-          Logger.info(fn -> "Sending #{activity.data["id"]} out via Salmon" end)
-          Pleroma.Web.Salmon.publish(actor, activity)
         end
       end
 
@@ -143,10 +135,6 @@ def perform(:incoming_ap_doc, params) do
     end
   end
 
-  def perform(:publish_single_salmon, params) do
-    Salmon.send_to_user(params)
-  end
-
   def perform(
         :publish_single_websub,
         %{xml: _xml, topic: _topic, callback: _callback, secret: _secret} = params
diff --git a/lib/pleroma/web/salmon/salmon.ex b/lib/pleroma/web/salmon/salmon.ex
index 0a9e51656..7b59609c0 100644
--- a/lib/pleroma/web/salmon/salmon.ex
+++ b/lib/pleroma/web/salmon/salmon.ex
@@ -3,12 +3,17 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.Salmon do
+  @behaviour Pleroma.Web.Federator.Publisher
+
   @httpoison Application.get_env(:pleroma, :httpoison)
 
   use Bitwise
 
+  alias Pleroma.Activity
   alias Pleroma.Instances
   alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.Visibility
+  alias Pleroma.Web.Federator.Publisher
   alias Pleroma.Web.OStatus.ActivityRepresenter
   alias Pleroma.Web.XML
 
@@ -165,12 +170,12 @@ def remote_users(%{data: %{"to" => to} = data}) do
   end
 
   @doc "Pushes an activity to remote account."
-  def send_to_user(%{recipient: %{info: %{salmon: salmon}}} = params),
-    do: send_to_user(Map.put(params, :recipient, salmon))
+  def publish_one(%{recipient: %{info: %{salmon: salmon}}} = params),
+    do: publish_one(Map.put(params, :recipient, salmon))
 
-  def send_to_user(%{recipient: url, feed: feed, poster: poster} = params) when is_binary(url) do
+  def publish_one(%{recipient: url, feed: feed} = params) when is_binary(url) do
     with {:ok, %{status: code}} when code in 200..299 <-
-           poster.(
+           @httpoison.post(
              url,
              feed,
              [{"Content-Type", "application/magic-envelope+xml"}]
@@ -184,11 +189,11 @@ def send_to_user(%{recipient: url, feed: feed, poster: poster} = params) when is
       e ->
         unless params[:unreachable_since], do: Instances.set_reachable(url)
         Logger.debug(fn -> "Pushing Salmon to #{url} failed, #{inspect(e)}" end)
-        :error
+        {:error, "Unreachable instance"}
     end
   end
 
-  def send_to_user(_), do: :noop
+  def publish_one(_), do: :noop
 
   @supported_activities [
     "Create",
@@ -199,13 +204,19 @@ def send_to_user(_), do: :noop
     "Delete"
   ]
 
+  def is_representable?(%Activity{data: %{"type" => type}} = activity)
+      when type in @supported_activities,
+      do: Visibility.is_public?(activity)
+
+  def is_representable?(_), do: false
+
   @doc """
   Publishes an activity to remote accounts
   """
-  @spec publish(User.t(), Pleroma.Activity.t(), Pleroma.HTTP.t()) :: none
-  def publish(user, activity, poster \\ &@httpoison.post/3)
+  @spec publish(User.t(), Pleroma.Activity.t()) :: none
+  def publish(user, activity)
 
-  def publish(%{info: %{keys: keys}} = user, %{data: %{"type" => type}} = activity, poster)
+  def publish(%{info: %{keys: keys}} = user, %{data: %{"type" => type}} = activity)
       when type in @supported_activities do
     feed = ActivityRepresenter.to_simple_form(activity, user, true)
 
@@ -229,15 +240,14 @@ def publish(%{info: %{keys: keys}} = user, %{data: %{"type" => type}} = activity
       |> Enum.each(fn remote_user ->
         Logger.debug(fn -> "Sending Salmon to #{remote_user.ap_id}" end)
 
-        Pleroma.Web.Federator.publish_single_salmon(%{
+        Publisher.enqueue_one(__MODULE__, %{
           recipient: remote_user,
           feed: feed,
-          poster: poster,
           unreachable_since: reachable_urls_metadata[remote_user.info.salmon]
         })
       end)
     end
   end
 
-  def publish(%{id: id}, _, _), do: Logger.debug(fn -> "Keys missing for user #{id}" end)
+  def publish(%{id: id}, _), do: Logger.debug(fn -> "Keys missing for user #{id}" end)
 end