CommonAPI: Support emoji reactions.

lib/pleroma/web/common_api/common_api.ex

@@ -123,6 +123,16 @@ def unfavorite(id_or_ap_id, user) do
     end
   end
 
+  def react_with_emoji(id, user, emoji) do
+    with %Activity{} = activity <- Activity.get_by_id(id),
+         object <- Object.normalize(activity) do
+      ActivityPub.react_with_emoji(user, object, emoji)
+    else
+      _ ->
+        {:error, dgettext("errors", "Could not add reaction emoji")}
+    end
+  end
+
   def vote(user, object, choices) do
     with "Question" <- object.data["type"],
          {:author, false} <- {:author, object.data["actor"] == user.ap_id},

test/web/common_api/common_api_test.exs

@@ -222,6 +222,20 @@ test "it can handle activities that expire" do
   end
 
   describe "reactions" do
+    test "reacting to a status with an emoji" do
+      user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, activity} = CommonAPI.post(other_user, %{"status" => "cofe"})
+
+      {:ok, reaction, _} = CommonAPI.react_with_emoji(activity.id, user, "👍")
+
+      assert reaction.data["actor"] == user.ap_id
+      assert reaction.data["content"] == "👍"
+
+      # TODO: test error case.
+    end
+
     test "repeating a status" do
       user = insert(:user)
       other_user = insert(:user)