Handle incoming favorites, fetch potentially missing messages.

[akkoma] / lib / pleroma / web / ostatus / ostatus.ex

diff --git a/lib/pleroma/web/ostatus/ostatus.ex b/lib/pleroma/web/ostatus/ostatus.ex
index 2fab676631df3f16b7562bb7ac6db905a6d68671..0a4361393b3bacc601a10b670c60f0e882ea263a 100644 (file)
--- a/lib/pleroma/web/ostatus/ostatus.ex
+++ b/lib/pleroma/web/ostatus/ostatus.ex
@@ -1,4 +1,6 @@
 defmodule Pleroma.Web.OStatus do
+  @httpoison Application.get_env(:pleroma, :httpoison)
+
   import Ecto.Query
   import Pleroma.Web.XML
   require Logger
@@ -24,12 +26,14 @@ defmodule Pleroma.Web.OStatus do
     entries = :xmerl_xpath.string('//entry', doc)
 
     activities = Enum.map(entries, fn (entry) ->
-      {:xmlObj, :string, object_type } = :xmerl_xpath.string('string(/entry/activity:object-type[1])', entry)
-      {:xmlObj, :string, verb } = :xmerl_xpath.string('string(/entry/activity:verb[1])', entry)
+      {:xmlObj, :string, object_type} = :xmerl_xpath.string('string(/entry/activity:object-type[1])', entry)
+      {:xmlObj, :string, verb} = :xmerl_xpath.string('string(/entry/activity:verb[1])', entry)
 
       case verb do
         'http://activitystrea.ms/schema/1.0/share' ->
           with {:ok, activity, retweeted_activity} <- handle_share(entry, doc), do: [activity, retweeted_activity]
+        'http://activitystrea.ms/schema/1.0/favorite' ->
+          with {:ok, activity, favorited_activity} <- handle_favorite(entry, doc), do: [activity, favorited_activity]
         _ ->
           case object_type do
             'http://activitystrea.ms/schema/1.0/note' ->
@@ -45,10 +49,10 @@ defmodule Pleroma.Web.OStatus do
     {:ok, activities}
   end
 
-  def make_share(entry, doc, retweeted_activity) do
+  def make_share(_entry, doc, retweeted_activity) do
     with {:ok, actor} <- find_make_or_update_user(doc),
          %Object{} = object <- Object.get_cached_by_ap_id(retweeted_activity.data["object"]["id"]),
-         {:ok, activity, object} = ActivityPub.announce(actor, object, false) do
+         {:ok, activity, _object} = ActivityPub.announce(actor, object, false) do
       {:ok, activity}
     end
   end
@@ -63,6 +67,24 @@ defmodule Pleroma.Web.OStatus do
     end
   end
 
+  def make_favorite(_entry, doc, favorited_activity) do
+    with {:ok, actor} <- find_make_or_update_user(doc),
+         %Object{} = object <- Object.get_cached_by_ap_id(favorited_activity.data["object"]["id"]),
+         {:ok, activity, _object} = ActivityPub.like(actor, object, false) do
+      {:ok, activity}
+    end
+  end
+
+  def handle_favorite(entry, doc) do
+    with href when not is_nil(href) <- string_from_xpath("//activity:object[1]/link[@type=\"text/html\"]/@href", entry),
+         {:ok, [favorited_activity]} <- fetch_activity_from_html_url(href),
+         {:ok, activity} <- make_favorite(entry, doc, favorited_activity) do
+      {:ok, activity, favorited_activity}
+    else
+      e -> {:error, e}
+    end
+  end
+
   def get_attachments(entry) do
     :xmerl_xpath.string('/entry/link[@rel="enclosure"]', entry)
     |> Enum.map(fn (enclosure) ->
@@ -206,8 +228,34 @@ defmodule Pleroma.Web.OStatus do
          {:ok, feed_data} <- Websub.gather_feed_data(webfinger_data["topic"]) do
       {:ok, Map.merge(webfinger_data, feed_data) |> Map.put("fqn", username)}
     else e ->
-      Logger.debug("Couldn't gather info for #{username}")
+      Logger.debug(fn -> "Couldn't gather info for #{username}" end)
       {:error, e}
     end
   end
+
+  # Regex-based 'parsing' so we don't have to pull in a full html parser
+  # It's a hack anyway. Maybe revisit this in the future
+  @mastodon_regex ~r/<link href='(.*)' rel='alternate' type='application\/atom\+xml'>/
+  @gs_regex ~r/<link title=.* href="(.*)" type="application\/atom\+xml" rel="alternate">/
+  def get_atom_url(body) do
+    cond do
+      Regex.match?(@mastodon_regex, body) ->
+        [[_, match]] = Regex.scan(@mastodon_regex, body)
+        {:ok, match}
+      Regex.match?(@gs_regex, body) ->
+        [[_, match]] = Regex.scan(@gs_regex, body)
+        {:ok, match}
+      true ->
+        Logger.debug(fn -> "Couldn't find atom link in #{inspect(body)}" end)
+        {:error, "Couldn't find the atom link"}
+    end
+  end
+
+  def fetch_activity_from_html_url(url) do
+    with {:ok, %{body: body}} <- @httpoison.get(url),
+         {:ok, atom_url} <- get_atom_url(body),
+         {:ok, %{status_code: code, body: body}} when code in 200..299 <- @httpoison.get(atom_url) do
+      handle_incoming(body)
+    end
+  end
 end