From 423194520e3fd1d2b285e7cf34a8ad7476276f5d Mon Sep 17 00:00:00 2001
From: Roger Braun <roger@rogerbraun.net>
Date: Mon, 15 May 2017 18:25:21 +0200
Subject: [PATCH] Fix mention replacing.

---
 lib/pleroma/web/twitter_api/twitter_api.ex | 16 +++++++++++++++-
 test/web/twitter_api/twitter_api_test.exs  | 11 +++++++----
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/lib/pleroma/web/twitter_api/twitter_api.ex b/lib/pleroma/web/twitter_api/twitter_api.ex
index 6503d7222..3b575756d 100644
--- a/lib/pleroma/web/twitter_api/twitter_api.ex
+++ b/lib/pleroma/web/twitter_api/twitter_api.ex
@@ -243,7 +243,21 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
   end
 
   def add_user_links(text, mentions) do
-    Enum.reduce(mentions, text, fn ({match, %User{ap_id: ap_id}}, text) -> String.replace(text, match, "<a href='#{ap_id}'>#{match}</a>") end)
+    mentions = mentions
+    |> Enum.sort_by(fn ({name, _}) -> -String.length(name) end)
+    |> Enum.map(fn({name, user}) -> {name, user, Ecto.UUID.generate} end)
+
+    # This replaces the mention with a unique reference first so it doesn't
+    # contain parts of other replaced mentions. There probably is a better
+    # solution for this...
+    step_one = mentions
+    |> Enum.reduce(text, fn ({match, _user, uuid}, text) ->
+      String.replace(text, match, uuid)
+    end)
+
+    Enum.reduce(mentions, step_one, fn ({match, %User{ap_id: ap_id}, uuid}, text) ->
+      String.replace(text, uuid, "<a href='#{ap_id}'>#{match}</a>")
+    end)
   end
 
   def register_user(params) do
diff --git a/test/web/twitter_api/twitter_api_test.exs b/test/web/twitter_api/twitter_api_test.exs
index ebc9e362f..d70ef88f3 100644
--- a/test/web/twitter_api/twitter_api_test.exs
+++ b/test/web/twitter_api/twitter_api_test.exs
@@ -236,27 +236,30 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPITest do
   end
 
   test "it can parse mentions and return the relevant users" do
-    text = "@gsimg According to @archaeme , that is @daggsy."
+    text = "@gsimg According to @archaeme, that is @daggsy. Also hello @archaeme@archae.me"
 
     gsimg = insert(:user, %{nickname: "gsimg"})
     archaeme = insert(:user, %{nickname: "archaeme"})
+    archaeme_remote = insert(:user, %{nickname: "archaeme@archae.me"})
 
     expected_result = [
       {"@gsimg", gsimg},
-      {"@archaeme", archaeme}
+      {"@archaeme", archaeme},
+      {"@archaeme@archae.me", archaeme_remote},
     ]
 
     assert TwitterAPI.parse_mentions(text) == expected_result
   end
 
   test "it adds user links to an existing text" do
-    text = "@gsimg According to @archaeme , that is @daggsy."
+    text = "@gsimg According to @archaeme, that is @daggsy. Also hello @archaeme@archae.me"
 
     gsimg = insert(:user, %{nickname: "gsimg"})
     archaeme = insert(:user, %{nickname: "archaeme"})
+    archaeme_remote = insert(:user, %{nickname: "archaeme@archae.me"})
 
     mentions = TwitterAPI.parse_mentions(text)
-    expected_text = "<a href='#{gsimg.ap_id}'>@gsimg</a> According to <a href='#{archaeme.ap_id}'>@archaeme</a> , that is @daggsy."
+    expected_text = "<a href='#{gsimg.ap_id}'>@gsimg</a> According to <a href='#{archaeme.ap_id}'>@archaeme</a>, that is @daggsy. Also hello <a href='#{archaeme_remote.ap_id}'>@archaeme@archae.me</a>"
 
     assert TwitterAPI.add_user_links(text, mentions) == expected_text
   end