retrieving oauth token with LDAP credentials

CHANGELOG

@@ -22,6 +22,7 @@ v 8.0.0 (unreleased)
   - Fix 500 error when submit project snippet without body
   - Improve search page usability
   - Bring more UI consistency in way how projects, snippets and groups lists are rendered
+  - Retrieving oauth token with LDAP credentials
 
 v 7.14.1
   - Improve abuse reports management from admin area

config/initializers/doorkeeper.rb

@@ -12,8 +12,7 @@
   end
 
   resource_owner_from_credentials do |routes|
-    u = User.find_by(email: params[:username]) || User.find_by(username: params[:username])
-    u if u && u.valid_password?(params[:password])
+    Gitlab::Auth.new.find(params[:username], params[:password])
   end
 
   # If you want to restrict access to the web interface for adding oauth authorized applications, you need to declare the block below.