lib/popcorn: introduce middleware examples

[nit.git] / lib / popcorn / examples / middlewares / example_html_error_handler.nit
diff --git a/lib/popcorn/examples/middlewares/example_html_error_handler.nit b/lib/popcorn/examples/middlewares/example_html_error_handler.nit

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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2016 Alexandre Terrasa <alexandre@moz-code.org>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import popcorn
+import template
+
+class HtmlErrorTemplate
+       super Template
+
+       var status: Int
+       var message: nullable String
+
+       redef fun rendering do add """
+               <!DOCTYPE html>
+               <html>
+               <head>
+                       <meta charset="utf-8">
+                       <title>{{{message or else status}}}</title>
+               </head>
+               <body>
+               <h1>{{{status}}} {{{message or else ""}}}</h1>
+               </body>
+               </html>"""
+end
+
+class HtmlErrorHandler
+       super Handler
+
+       redef fun all(req, res) do
+               if res.status_code != 200 then
+                       res.send(new HtmlErrorTemplate(res.status_code, "An error occurred!"))
+               end
+       end
+end
+
+var app = new App
+app.use("/*", new HtmlErrorHandler)
+app.listen("localhost", 3000)