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 module example_html_error_handler is example
  18
  19 import popcorn
  20 import template
  21
  22 class HtmlErrorTemplate
  23         super Template
  24
  25         var status: Int
  26         var message: nullable String
  27
  28         redef fun rendering do add """
  29                 <!DOCTYPE html>
  30                 <html>
  31                 <head>
  32                         <meta charset="utf-8">
  33                         <title>{{{message or else status}}}</title>
  34                 </head>
  35                 <body>
  36                 <h1>{{{status}}} {{{message or else ""}}}</h1>
  37                 </body>
  38                 </html>"""
  39 end
  40
  41 class HtmlErrorHandler
  42         super Handler
  43
  44         redef fun all(req, res) do
  45                 if res.status_code != 200 then
  46                         res.send(new HtmlErrorTemplate(res.status_code, "An error occurred!"))
  47                 end
  48         end
  49 end
  50
  51 var app = new App
  52 app.use("/*", new HtmlErrorHandler)
  53 app.listen("localhost", 3000)