verify current_user through username and password

app/api/mobile/api.rb

@@ -54,6 +54,17 @@ module Mobile
           return User.find(token.user_id)
         end
 
+        # 通过另外一种方式验证当前用户 username, password
+        username = params[:username]
+        password = params[:password]
+        if username && password
+          us = UsersService.new
+          user = us.verify_user username, password
+          if user != nil
+            return user
+          end
+        end
+
         nil
       end
     end