Initial commit

hm_sunwell/node_modules/finalhandler/index.js

@@ -0,0 +1,189 @@
+/*!
+ * finalhandler
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict'
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var debug = require('debug')('finalhandler')
+var escapeHtml = require('escape-html')
+var onFinished = require('on-finished')
+var statuses = require('statuses')
+var unpipe = require('unpipe')
+
+/**
+ * Module variables.
+ * @private
+ */
+
+/* istanbul ignore next */
+var defer = typeof setImmediate === 'function'
+  ? setImmediate
+  : function (fn) { process.nextTick(fn.bind.apply(fn, arguments)) }
+var isFinished = onFinished.isFinished
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = finalhandler
+
+/**
+ * Create a function to handle the final response.
+ *
+ * @param {Request} req
+ * @param {Response} res
+ * @param {Object} [options]
+ * @return {Function}
+ * @public
+ */
+
+function finalhandler (req, res, options) {
+  var opts = options || {}
+
+  // get environment
+  var env = opts.env || process.env.NODE_ENV || 'development'
+
+  // get error callback
+  var onerror = opts.onerror
+
+  return function (err) {
+    var headers = Object.create(null)
+    var status
+
+    // ignore 404 on in-flight response
+    if (!err && res._header) {
+      debug('cannot 404 after headers sent')
+      return
+    }
+
+    // unhandled error
+    if (err) {
+      // respect status code from error
+      status = getErrorStatusCode(err) || res.statusCode
+
+      // default status code to 500 if outside valid range
+      if (typeof status !== 'number' || status < 400 || status > 599) {
+        status = 500
+      }
+
+      // respect err.headers
+      if (err.headers && (err.status === status || err.statusCode === status)) {
+        var keys = Object.keys(err.headers)
+        for (var i = 0; i < keys.length; i++) {
+          var key = keys[i]
+          headers[key] = err.headers[key]
+        }
+      }
+
+      // production gets a basic error message
+      var msg = env === 'production'
+        ? statuses[status]
+        : err.stack || err.toString()
+      msg = escapeHtml(msg)
+        .replace(/\n/g, '<br>')
+        .replace(/\x20{2}/g, ' &nbsp;') + '\n'
+    } else {
+      status = 404
+      msg = 'Cannot ' + escapeHtml(req.method) + ' ' + escapeHtml(req.originalUrl || req.url) + '\n'
+    }
+
+    debug('default %s', status)
+
+    // schedule onerror callback
+    if (err && onerror) {
+      defer(onerror, err, req, res)
+    }
+
+    // cannot actually respond
+    if (res._header) {
+      debug('cannot %d after headers sent', status)
+      req.socket.destroy()
+      return
+    }
+
+    // send response
+    send(req, res, status, headers, msg)
+  }
+}
+
+/**
+ * Get status code from Error object.
+ *
+ * @param {Error} err
+ * @return {number}
+ * @private
+ */
+
+function getErrorStatusCode (err) {
+  // check err.status
+  if (typeof err.status === 'number' && err.status >= 400 && err.status < 600) {
+    return err.status
+  }
+
+  // check err.statusCode
+  if (typeof err.statusCode === 'number' && err.statusCode >= 400 && err.statusCode < 600) {
+    return err.statusCode
+  }
+
+  return undefined
+}
+
+/**
+ * Send response.
+ *
+ * @param {IncomingMessage} req
+ * @param {OutgoingMessage} res
+ * @param {number} status
+ * @param {object} headers
+ * @param {string} body
+ * @private
+ */
+
+function send (req, res, status, headers, body) {
+  function write () {
+    // response status
+    res.statusCode = status
+    res.statusMessage = statuses[status]
+
+    // response headers
+    var keys = Object.keys(headers)
+    for (var i = 0; i < keys.length; i++) {
+      var key = keys[i]
+      res.setHeader(key, headers[key])
+    }
+
+    // security header for content sniffing
+    res.setHeader('X-Content-Type-Options', 'nosniff')
+
+    // standard headers
+    res.setHeader('Content-Type', 'text/html; charset=utf-8')
+    res.setHeader('Content-Length', Buffer.byteLength(body, 'utf8'))
+
+    if (req.method === 'HEAD') {
+      res.end()
+      return
+    }
+
+    res.end(body, 'utf8')
+  }
+
+  if (isFinished(req)) {
+    write()
+    return
+  }
+
+  // unpipe everything from the request
+  unpipe(req)
+
+  // flush the request
+  onFinished(req, write)
+  req.resume()
+}