Made match_routing a class method, so that it can be called from outs…

…ide (useful for building authorization around Grack).

lib/grack.rb

@@ -44,7 +44,7 @@ def call(env)
       @env = env
       @req = Rack::Request.new(env)
 
-      cmd, path, @reqfile, @rpc = match_routing(@req)
+      cmd, path, @reqfile, @rpc = self.class.match_routing(@req)
 
       return render_method_not_allowed if cmd == 'not_allowed'
       return render_not_found if !cmd
@@ -186,7 +186,7 @@ def get_service_type
       service_type.gsub('git-', '')
     end
 
-    def match_routing(req)
+    def self.match_routing(req)
       cmd = nil
       path = nil
       SERVICES.each do |method, handler, match, rpc|