an ability to clone project with oauth2 token

db/migrate/20150116234545_add_gitlab_access_token_to_user.rb

+class AddGitlabAccessTokenToUser < ActiveRecord::Migration
+  def change
+    add_column :users, :gitlab_access_token, :string
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150116234544) do
+ActiveRecord::Schema.define(version: 20150116234545) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -434,6 +434,7 @@ ActiveRecord::Schema.define(version: 20150116234544) do
     t.string   "website_url",              default: "",    null: false
     t.datetime "last_credential_check_at"
     t.string   "github_access_token"
+    t.string   "gitlab_access_token"
   end
 
   add_index "users", ["admin"], name: "index_users_on_admin", using: :btree

lib/gitlab/backend/grack_auth.rb

@@ -71,8 +71,20 @@ module Grack
       false
     end
 
+    def oauth_access_token_check(login, password)
+      if login == "oauth2" && git_cmd == 'git-upload-pack' && password.present?
+        token = Doorkeeper::AccessToken.by_token(password)
+        token && token.accessible? && User.find_by(id: token.resource_owner_id)
+      end
+    end
+
     def authenticate_user(login, password)
       user = Gitlab::Auth.new.find(login, password)
+      
+      unless user
+        user = oauth_access_token_check(login, password)
+      end
+      
       return user if user.present?
 
       # At this point, we know the credentials were wrong. We let Rack::Attack