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node_modules/connect/lib/middleware/errorHandler.js

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+/*!
+ * Connect - errorHandler
+ * Copyright(c) 2010 Sencha Inc.
+ * Copyright(c) 2011 TJ Holowaychuk
+ * MIT Licensed
+ */
+
+/**
+ * Module dependencies.
+ */
+
+var utils = require('../utils')
+  , fs = require('fs');
+
+// environment
+
+var env = process.env.NODE_ENV || 'development';
+
+/**
+ * Error handler:
+ *
+ * Development error handler, providing stack traces
+ * and error message responses for requests accepting text, html,
+ * or json.
+ *
+ * Text:
+ *
+ *   By default, and when _text/plain_ is accepted a simple stack trace
+ *   or error message will be returned.
+ *
+ * JSON:
+ *
+ *   When _application/json_ is accepted, connect will respond with
+ *   an object in the form of `{ "error": error }`.
+ *
+ * HTML:
+ *
+ *   When accepted connect will output a nice html stack trace.
+ *
+ * @return {Function}
+ * @api public
+ */
+
+exports = module.exports = function errorHandler(){
+  return function errorHandler(err, req, res, next){
+    if (err.status) res.statusCode = err.status;
+    if (res.statusCode < 400) res.statusCode = 500;
+    if ('test' != env) console.error(err.stack);
+    var accept = req.headers.accept || '';
+    // html
+    if (~accept.indexOf('html')) {
+      fs.readFile(__dirname + '/../public/style.css', 'utf8', function(e, style){
+        fs.readFile(__dirname + '/../public/error.html', 'utf8', function(e, html){
+          var stack = (err.stack || '')
+            .split('\n').slice(1)
+            .map(function(v){ return '<li>' + v + '</li>'; }).join('');
+            html = html
+              .replace('{style}', style)
+              .replace('{stack}', stack)
+              .replace('{title}', exports.title)
+              .replace('{statusCode}', res.statusCode)
+              .replace(/\{error\}/g, utils.escape(err.toString()));
+            res.setHeader('Content-Type', 'text/html; charset=utf-8');
+            res.end(html);
+        });
+      });
+    // json
+    } else if (~accept.indexOf('json')) {
+      var error = { message: err.message, stack: err.stack };
+      for (var prop in err) error[prop] = err[prop];
+      var json = JSON.stringify({ error: error });
+      res.setHeader('Content-Type', 'application/json');
+      res.end(json);
+    // plain text
+    } else {
+      res.writeHead(res.statusCode, { 'Content-Type': 'text/plain' });
+      res.end(err.stack);
+    }
+  };
+};
+
+/**
+ * Template title, framework authors may override this value.
+ */
+
+exports.title = 'Connect';