lib/popcorn/examples/middlewares/example_html_error_handler.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2016 Alexandre Terrasa <alexandre@moz-code.org>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 import popcorn
  18 import template
  19
  20 class HtmlErrorTemplate
  21         super Template
  22
  23         var status: Int
  24         var message: nullable String
  25
  26         redef fun rendering do add """
  27                 <!DOCTYPE html>
  28                 <html>
  29                 <head>
  30                         <meta charset="utf-8">
  31                         <title>{{{message or else status}}}</title>
  32                 </head>
  33                 <body>
  34                 <h1>{{{status}}} {{{message or else ""}}}</h1>
  35                 </body>
  36                 </html>"""
  37 end
  38
  39 class HtmlErrorHandler
  40         super Handler
  41
  42         redef fun all(req, res) do
  43                 if res.status_code != 200 then
  44                         res.send(new HtmlErrorTemplate(res.status_code, "An error occurred!"))
  45                 end
  46         end
  47 end
  48
  49 var app = new App
  50 app.use("/*", new HtmlErrorHandler)
  51 app.listen("localhost", 3000)