1/*!
 2 * Connect - errorHandler
 3 * Copyright(c) 2010 Sencha Inc.
 4 * Copyright(c) 2011 TJ Holowaychuk
 5 * MIT Licensed
 6 */
 7
 8/**
 9 * Module dependencies.
10 */
11
12var utils = require('../utils')
13  , fs = require('fs');
14
15// environment
16
17var env = process.env.NODE_ENV || 'development';
18
19/**
20 * Error handler:
21 *
22 * Development error handler, providing stack traces
23 * and error message responses for requests accepting text, html,
24 * or json.
25 *
26 * Text:
27 *
28 *   By default, and when _text/plain_ is accepted a simple stack trace
29 *   or error message will be returned.
30 *
31 * JSON:
32 *
33 *   When _application/json_ is accepted, connect will respond with
34 *   an object in the form of `{ "error": error }`.
35 *
36 * HTML:
37 *
38 *   When accepted connect will output a nice html stack trace.
39 *
40 * @return {Function}
41 * @api public
42 */
43
44exports = module.exports = function errorHandler(){
45  return function errorHandler(err, req, res, next){
46    if (err.status) res.statusCode = err.status;
47    if (res.statusCode < 400) res.statusCode = 500;
48    if ('test' != env) console.error(err.stack);
49    var accept = req.headers.accept || '';
50    // html
51    if (~accept.indexOf('html')) {
52      fs.readFile(__dirname + '/../public/style.css', 'utf8', function(e, style){
53        fs.readFile(__dirname + '/../public/error.html', 'utf8', function(e, html){
54          var stack = (err.stack || '')
55            .split('\n').slice(1)
56            .map(function(v){ return '<li>' + v + '</li>'; }).join('');
57            html = html
58              .replace('{style}', style)
59              .replace('{stack}', stack)
60              .replace('{title}', exports.title)
61              .replace('{statusCode}', res.statusCode)
62              .replace(/\{error\}/g, utils.escape(err.toString()));
63            res.setHeader('Content-Type', 'text/html; charset=utf-8');
64            res.end(html);
65        });
66      });
67    // json
68    } else if (~accept.indexOf('json')) {
69      var error = { message: err.message, stack: err.stack };
70      for (var prop in err) error[prop] = err[prop];
71      var json = JSON.stringify({ error: error });
72      res.setHeader('Content-Type', 'application/json');
73      res.end(json);
74    // plain text
75    } else {
76      res.writeHead(res.statusCode, { 'Content-Type': 'text/plain' });
77      res.end(err.stack);
78    }
79  };
80};
81
82/**
83 * Template title, framework authors may override this value.
84 */
85
86exports.title = 'Connect';