comparison node_modules/express/lib/request.js @ 73:0c3a2942ddee

now using express to server static content

+/**
+ * Module dependencies.
+ */
+
+var accepts = require('accepts');
+var typeis = require('type-is');
+var http = require('http');
+var fresh = require('fresh');
+var parseRange = require('range-parser');
+var parse = require('parseurl');
+var proxyaddr = require('proxy-addr');
+
+/**
+ * Request prototype.
+ */
+
+var req = exports = module.exports = {
+  __proto__: http.IncomingMessage.prototype
+};
+
+/**
+ * Return request header.
+ *
+ * The `Referrer` header field is special-cased,
+ * both `Referrer` and `Referer` are interchangeable.
+ *
+ * Examples:
+ *
+ *     req.get('Content-Type');
+ *     // => "text/plain"
+ *
+ *     req.get('content-type');
+ *     // => "text/plain"
+ *
+ *     req.get('Something');
+ *     // => undefined
+ *
+ * Aliased as `req.header()`.
+ *
+ * @param {String} name
+ * @return {String}
+ * @api public
+ */
+
+req.get =
+req.header = function(name){
+  switch (name = name.toLowerCase()) {
+    case 'referer':
+    case 'referrer':
+      return this.headers.referrer
+        || this.headers.referer;
+    default:
+      return this.headers[name];
+  }
+};
+
+/**
+ * To do: update docs.
+ *
+ * Check if the given `type(s)` is acceptable, returning
+ * the best match when true, otherwise `undefined`, in which
+ * case you should respond with 406 "Not Acceptable".
+ *
+ * The `type` value may be a single mime type string
+ * such as "application/json", the extension name
+ * such as "json", a comma-delimted list such as "json, html, text/plain",
+ * an argument list such as `"json", "html", "text/plain"`,
+ * or an array `["json", "html", "text/plain"]`. When a list
+ * or array is given the _best_ match, if any is returned.
+ *
+ * Examples:
+ *
+ *     // Accept: text/html
+ *     req.accepts('html');
+ *     // => "html"
+ *
+ *     // Accept: text/*, application/json
+ *     req.accepts('html');
+ *     // => "html"
+ *     req.accepts('text/html');
+ *     // => "text/html"
+ *     req.accepts('json, text');
+ *     // => "json"
+ *     req.accepts('application/json');
+ *     // => "application/json"
+ *
+ *     // Accept: text/*, application/json
+ *     req.accepts('image/png');
+ *     req.accepts('png');
+ *     // => undefined
+ *
+ *     // Accept: text/*;q=.5, application/json
+ *     req.accepts(['html', 'json']);
+ *     req.accepts('html', 'json');
+ *     req.accepts('html, json');
+ *     // => "json"
+ *
+ * @param {String|Array} type(s)
+ * @return {String}
+ * @api public
+ */
+
+req.accepts = function(){
+  var accept = accepts(this);
+  return accept.types.apply(accept, arguments);
+};
+
+/**
+ * Check if the given `encoding` is accepted.
+ *
+ * @param {String} encoding
+ * @return {Boolean}
+ * @api public
+ */
+
+req.acceptsEncoding = // backwards compatibility
+req.acceptsEncodings = function(){
+  var accept = accepts(this);
+  return accept.encodings.apply(accept, arguments);
+};
+
+/**
+ * To do: update docs.
+ *
+ * Check if the given `charset` is acceptable,
+ * otherwise you should respond with 406 "Not Acceptable".
+ *
+ * @param {String} charset
+ * @return {Boolean}
+ * @api public
+ */
+
+req.acceptsCharset = // backwards compatibility
+req.acceptsCharsets = function(){
+  var accept = accepts(this);
+  return accept.charsets.apply(accept, arguments);
+};
+
+/**
+ * To do: update docs.
+ *
+ * Check if the given `lang` is acceptable,
+ * otherwise you should respond with 406 "Not Acceptable".
+ *
+ * @param {String} lang
+ * @return {Boolean}
+ * @api public
+ */
+
+req.acceptsLanguage = // backwards compatibility
+req.acceptsLanguages = function(){
+  var accept = accepts(this);
+  return accept.languages.apply(accept, arguments);
+};
+
+/**
+ * Parse Range header field,
+ * capping to the given `size`.
+ *
+ * Unspecified ranges such as "0-" require
+ * knowledge of your resource length. In
+ * the case of a byte range this is of course
+ * the total number of bytes. If the Range
+ * header field is not given `null` is returned,
+ * `-1` when unsatisfiable, `-2` when syntactically invalid.
+ *
+ * NOTE: remember that ranges are inclusive, so
+ * for example "Range: users=0-3" should respond
+ * with 4 users when available, not 3.
+ *
+ * @param {Number} size
+ * @return {Array}
+ * @api public
+ */
+
+req.range = function(size){
+  var range = this.get('Range');
+  if (!range) return;
+  return parseRange(size, range);
+};
+
+/**
+ * Return the value of param `name` when present or `defaultValue`.
+ *
+ *  - Checks route placeholders, ex: _/user/:id_
+ *  - Checks body params, ex: id=12, {"id":12}
+ *  - Checks query string params, ex: ?id=12
+ *
+ * To utilize request bodies, `req.body`
+ * should be an object. This can be done by using
+ * the `bodyParser()` middleware.
+ *
+ * @param {String} name
+ * @param {Mixed} [defaultValue]
+ * @return {String}
+ * @api public
+ */
+
+req.param = function(name, defaultValue){
+  var params = this.params || {};
+  var body = this.body || {};
+  var query = this.query || {};
+  if (null != params[name] && params.hasOwnProperty(name)) return params[name];
+  if (null != body[name]) return body[name];
+  if (null != query[name]) return query[name];
+  return defaultValue;
+};
+
+/**
+ * Check if the incoming request contains the "Content-Type"
+ * header field, and it contains the give mime `type`.
+ *
+ * Examples:
+ *
+ *      // With Content-Type: text/html; charset=utf-8
+ *      req.is('html');
+ *      req.is('text/html');
+ *      req.is('text/*');
+ *      // => true
+ *
+ *      // When Content-Type is application/json
+ *      req.is('json');
+ *      req.is('application/json');
+ *      req.is('application/*');
+ *      // => true
+ *
+ *      req.is('html');
+ *      // => false
+ *
+ * @param {String} type
+ * @return {Boolean}
+ * @api public
+ */
+
+req.is = function(types){
+  if (!Array.isArray(types)) types = [].slice.call(arguments);
+  return typeis(this, types);
+};
+
+/**
+ * Return the protocol string "http" or "https"
+ * when requested with TLS. When the "trust proxy"
+ * setting trusts the socket address, the
+ * "X-Forwarded-Proto" header field will be trusted.
+ * If you're running behind a reverse proxy that
+ * supplies https for you this may be enabled.
+ *
+ * @return {String}
+ * @api public
+ */
+
+req.__defineGetter__('protocol', function(){
+  var trust = this.app.get('trust proxy fn');
+
+  if (!trust(this.connection.remoteAddress)) {
+    return this.connection.encrypted
+      ? 'https'
+      : 'http';
+  }
+
+  // Note: X-Forwarded-Proto is normally only ever a
+  //       single value, but this is to be safe.
+  var proto = this.get('X-Forwarded-Proto') || 'http';
+  return proto.split(/\s*,\s*/)[0];
+});
+
+/**
+ * Short-hand for:
+ *
+ *    req.protocol == 'https'
+ *
+ * @return {Boolean}
+ * @api public
+ */
+
+req.__defineGetter__('secure', function(){
+  return 'https' == this.protocol;
+});
+
+/**
+ * Return the remote address from the trusted proxy.
+ *
+ * The is the remote address on the socket unless
+ * "trust proxy" is set.
+ *
+ * @return {String}
+ * @api public
+ */
+
+req.__defineGetter__('ip', function(){
+  var trust = this.app.get('trust proxy fn');
+  return proxyaddr(this, trust);
+});
+
+/**
+ * When "trust proxy" is set, trusted proxy addresses + client.
+ *
+ * For example if the value were "client, proxy1, proxy2"
+ * you would receive the array `["client", "proxy1", "proxy2"]`
+ * where "proxy2" is the furthest down-stream and "proxy1" and
+ * "proxy2" were trusted.
+ *
+ * @return {Array}
+ * @api public
+ */
+
+req.__defineGetter__('ips', function(){
+  var trust = this.app.get('trust proxy fn');
+  var addrs = proxyaddr.all(this, trust);
+  return addrs.slice(1).reverse();
+});
+
+/**
+ * Return subdomains as an array.
+ *
+ * Subdomains are the dot-separated parts of the host before the main domain of
+ * the app. By default, the domain of the app is assumed to be the last two
+ * parts of the host. This can be changed by setting "subdomain offset".
+ *
+ * For example, if the domain is "tobi.ferrets.example.com":
+ * If "subdomain offset" is not set, req.subdomains is `["ferrets", "tobi"]`.
+ * If "subdomain offset" is 3, req.subdomains is `["tobi"]`.
+ *
+ * @return {Array}
+ * @api public
+ */
+
+req.__defineGetter__('subdomains', function(){
+  var offset = this.app.get('subdomain offset');
+  return (this.host || '')
+    .split('.')
+    .reverse()
+    .slice(offset);
+});
+
+/**
+ * Short-hand for `url.parse(req.url).pathname`.
+ *
+ * @return {String}
+ * @api public
+ */
+
+req.__defineGetter__('path', function(){
+  return parse(this).pathname;
+});
+
+/**
+ * Parse the "Host" header field hostname.
+ *
+ * When the "trust proxy" setting trusts the socket
+ * address, the "X-Forwarded-Host" header field will
+ * be trusted.
+ *
+ * @return {String}
+ * @api public
+ */
+
+req.__defineGetter__('host', function(){
+  var trust = this.app.get('trust proxy fn');
+  var host = this.get('X-Forwarded-Host');
+
+  if (!host || !trust(this.connection.remoteAddress)) {
+    host = this.get('Host');
+  }
+
+  if (!host) return;
+
+  // IPv6 literal support
+  var offset = host[0] === '['
+    ? host.indexOf(']') + 1
+    : 0;
+  var index = host.indexOf(':', offset);
+
+  return ~index
+    ? host.substring(0, index)
+    : host;
+});
+
+/**
+ * Check if the request is fresh, aka
+ * Last-Modified and/or the ETag
+ * still match.
+ *
+ * @return {Boolean}
+ * @api public
+ */
+
+req.__defineGetter__('fresh', function(){
+  var method = this.method;
+  var s = this.res.statusCode;
+
+  // GET or HEAD for weak freshness validation only
+  if ('GET' != method && 'HEAD' != method) return false;
+
+  // 2xx or 304 as per rfc2616 14.26
+  if ((s >= 200 && s < 300) || 304 == s) {
+    return fresh(this.headers, this.res._headers);
+  }
+
+  return false;
+});
+
+/**
+ * Check if the request is stale, aka
+ * "Last-Modified" and / or the "ETag" for the
+ * resource has changed.
+ *
+ * @return {Boolean}
+ * @api public
+ */
+
+req.__defineGetter__('stale', function(){
+  return !this.fresh;
+});
+
+/**
+ * Check if the request was an _XMLHttpRequest_.
+ *
+ * @return {Boolean}
+ * @api public
+ */
+
+req.__defineGetter__('xhr', function(){
+  var val = this.get('X-Requested-With') || '';
+  return 'xmlhttprequest' == val.toLowerCase();
+});