rc@73: /*!
rc@73:  * errorhandler
rc@73:  * Copyright(c) 2010 Sencha Inc.
rc@73:  * Copyright(c) 2011 TJ Holowaychuk
rc@73:  * MIT Licensed
rc@73:  */
rc@73: 
rc@73: /**
rc@73:  * Module dependencies.
rc@73:  */
rc@73: 
rc@73: var accepts = require('accepts')
rc@73: var escapeHtml = require('escape-html');
rc@73: var fs = require('fs');
rc@73: 
rc@73: /**
rc@73:  * Error handler:
rc@73:  *
rc@73:  * Development error handler, providing stack traces
rc@73:  * and error message responses for requests accepting text, html,
rc@73:  * or json.
rc@73:  *
rc@73:  * Text:
rc@73:  *
rc@73:  *   By default, and when _text/plain_ is accepted a simple stack trace
rc@73:  *   or error message will be returned.
rc@73:  *
rc@73:  * JSON:
rc@73:  *
rc@73:  *   When _application/json_ is accepted, connect will respond with
rc@73:  *   an object in the form of `{ "error": error }`.
rc@73:  *
rc@73:  * HTML:
rc@73:  *
rc@73:  *   When accepted connect will output a nice html stack trace.
rc@73:  *
rc@73:  * @return {Function}
rc@73:  * @api public
rc@73:  */
rc@73: 
rc@73: exports = module.exports = function errorHandler(){
rc@73:   // get environment
rc@73:   var env = process.env.NODE_ENV || 'development'
rc@73: 
rc@73:   return function errorHandler(err, req, res, next){
rc@73:     // respect err.status
rc@73:     if (err.status) {
rc@73:       res.statusCode = err.status
rc@73:     }
rc@73: 
rc@73:     // default status code to 500
rc@73:     if (res.statusCode < 400) {
rc@73:       res.statusCode = 500
rc@73:     }
rc@73: 
rc@73:     // write error to console
rc@73:     if (env !== 'test') {
rc@73:       console.error(err.stack || String(err))
rc@73:     }
rc@73: 
rc@73:     // cannot actually respond
rc@73:     if (res._header) {
rc@73:       return req.socket.destroy()
rc@73:     }
rc@73: 
rc@73:     // negotiate
rc@73:     var accept = accepts(req)
rc@73:     var type = accept.types('html', 'json', 'text')
rc@73: 
rc@73:     // Security header for content sniffing
rc@73:     res.setHeader('X-Content-Type-Options', 'nosniff')
rc@73: 
rc@73:     // html
rc@73:     if (type === 'html') {
rc@73:       fs.readFile(__dirname + '/public/style.css', 'utf8', function(e, style){
rc@73:         if (e) return next(e);
rc@73:         fs.readFile(__dirname + '/public/error.html', 'utf8', function(e, html){
rc@73:           if (e) return next(e);
rc@73:           var stack = (err.stack || '')
rc@73:             .split('\n').slice(1)
rc@73:             .map(function(v){ return '<li>' + escapeHtml(v).replace(/  /g, ' &nbsp;') + '</li>'; }).join('');
rc@73:             html = html
rc@73:               .replace('{style}', style)
rc@73:               .replace('{stack}', stack)
rc@73:               .replace('{title}', escapeHtml(exports.title))
rc@73:               .replace('{statusCode}', res.statusCode)
rc@73:               .replace(/\{error\}/g, escapeHtml(String(err)).replace(/  /g, ' &nbsp;').replace(/\n/g, '<br>'));
rc@73:             res.setHeader('Content-Type', 'text/html; charset=utf-8');
rc@73:             res.end(html);
rc@73:         });
rc@73:       });
rc@73:     // json
rc@73:     } else if (type === 'json') {
rc@73:       var error = { message: err.message, stack: err.stack };
rc@73:       for (var prop in err) error[prop] = err[prop];
rc@73:       var json = JSON.stringify({ error: error });
rc@73:       res.setHeader('Content-Type', 'application/json');
rc@73:       res.end(json);
rc@73:     // plain text
rc@73:     } else {
rc@73:       res.setHeader('Content-Type', 'text/plain');
rc@73:       res.end(err.stack || String(err));
rc@73:     }
rc@73:   };
rc@73: };
rc@73: 
rc@73: /**
rc@73:  * Template title, framework authors may override this value.
rc@73:  */
rc@73: 
rc@73: exports.title = 'Connect';