Use default ports when no explicit port provided in URL

Author: mrhwick

url.js

@@ -727,6 +727,8 @@ Url.prototype.parseHost = function() {
       this.port = port.substr(1);
     }
     host = host.substr(0, host.length - port.length);
+  } else {
+    this.port = getPortFromProtocol(this.protocol);
   }
   if (host) this.hostname = host;
 };

util.js

@@ -1,5 +1,52 @@
 'use strict';
 
+var defaultProtocolPorts = {
+  "acap": 674,
+  "afp": 548,
+  "dict": 2628,
+  "dns": 53,
+  "file": null,
+  "ftp": 21,
+  "git": 9418,
+  "gopher": 70,
+  "http": 80,
+  "https": 443,
+  "imap": 143,
+  "ipp": 631,
+  "ipps": 631,
+  "irc": 194,
+  "ircs": 6697,
+  "ldap": 389,
+  "ldaps": 636,
+  "mms": 1755,
+  "msrp": 2855,
+  "msrps": null,
+  "mtqp": 1038,
+  "nfs": 111,
+  "nntp": 119,
+  "nntps": 563,
+  "pop": 110,
+  "prospero": 1525,
+  "redis": 6379,
+  "rsync": 873,
+  "rtsp": 554,
+  "rtsps": 322,
+  "rtspu": 5005,
+  "sftp": 22,
+  "smb": 445,
+  "snmp": 161,
+  "ssh": 22,
+  "steam": null,
+  "svn": 3690,
+  "telnet": 23,
+  "ventrilo": 3784,
+  "vnc": 5900,
+  "wais": 210,
+  "ws": 80,
+  "wss": 443,
+  "xmpp": null,
+}
+
 module.exports = {
   isString: function(arg) {
     return typeof(arg) === 'string';
@@ -12,5 +59,8 @@ module.exports = {
   },
   isNullOrUndefined: function(arg) {
     return arg == null;
-  }
+  },
+  getPortFromProtocol: function(protocol) {
+    return defaultProtocolPorts[protocol.slice(0, -1)];
+  },
 };