Improve grack auth

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

lib/gitlab/backend/grack_auth.rb

 require_relative 'shell_env'
-require_relative 'grack_helpers'
 
 module Grack
   class Auth < Rack::Auth::Basic
-    include Helpers
 
     attr_accessor :user, :project, :env
 
@@ -79,12 +77,14 @@ module Grack
 
     def authorize_request(service)
       case service
-      when 'git-upload-pack'
+      when *Gitlab::GitAccess::DOWNLOAD_COMMANDS
         # Serve only upload request.
         # Authorization on push will be serverd by update hook in repository
         Gitlab::GitAccess.new.download_allowed?(user, project)
-      else
+      when *Gitlab::GitAccess::PUSH_COMMANDS
         true
+      else
+        false
       end
     end
 
@@ -101,5 +101,18 @@ module Grack
     def project
       @project ||= project_by_path(@request.path_info)
     end
+
+    def project_by_path(path)
+      if m = /^([\w\.\/-]+)\.git/.match(path).to_a
+        path_with_namespace = m.last
+        path_with_namespace.gsub!(/\.wiki$/, '')
+
+        Project.find_with_namespace(path_with_namespace)
+      end
+    end
+
+    def render_not_found
+      [404, {"Content-Type" => "text/plain"}, ["Not Found"]]
+    end
   end
 end

lib/gitlab/backend/grack_helpers.rb

-module Grack
-  module Helpers
-    def project_by_path(path)
-      if m = /^([\w\.\/-]+)\.git/.match(path).to_a
-        path_with_namespace = m.last
-        path_with_namespace.gsub!(/\.wiki$/, '')
-
-        Project.find_with_namespace(path_with_namespace)
-      end
-    end
-
-    def render_not_found
-      [404, {"Content-Type" => "text/plain"}, ["Not Found"]]
-    end
-
-    def can?(object, action, subject)
-      abilities.allowed?(object, action, subject)
-    end
-
-    def abilities
-      @abilities ||= begin
-                       abilities = Six.new
-                       abilities << Ability
-                       abilities
-                     end
-    end
-  end
-end