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