From e72f2cfcb23c80f3bf634cc339ed2a468d4e9fce Mon Sep 17 00:00:00 2001
From: Stan Hu <stanhu@gmail.com>
Date: Sat, 8 Oct 2016 09:25:06 -0700
Subject: [PATCH] Fix missing constraints causing route failures when usernames
 with periods are used

Closes #23131
---
 config/routes/user.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/config/routes/user.rb b/config/routes/user.rb
index c287039ba26..54bbcb18f6a 100644
--- a/config/routes/user.rb
+++ b/config/routes/user.rb
@@ -15,7 +15,10 @@ devise_scope :user do
 end
 
 constraints(UserUrlConstrainer.new) do
-  scope(path: ':username', as: :user, controller: :users) do
+  scope(path: ':username',
+        as: :user,
+        constraints: { username: /[a-zA-Z.0-9_\-]+(?<!\.atom)/ },
+        controller: :users) do
     get '/', action: :show
   end
 end