url: do not truncate long hostnames

Currently, around line 417 lib/url.js is truncating hostname and put the
rest of hostname to the path if hostname length after `.`  is equal or
more than 63. This behavior is different from browser behavior. I
changed the code so that it doesn’t truncate.

I also added the test example which has more than 63 length in after
`.` in hostname in test url.

PR-URL: nodejs#9292
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>

lib/url.js

@@ -411,33 +411,22 @@ Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
 };
 
 function validateHostname(self, rest, hostname) {
-  for (var i = 0, lastPos; i <= hostname.length; ++i) {
-    var code;
-    if (i < hostname.length)
-      code = hostname.charCodeAt(i);
-    if (code === 46/*.*/ || i === hostname.length) {
-      if (i - lastPos > 0) {
-        if (i - lastPos > 63) {
-          self.hostname = hostname.slice(0, lastPos + 63);
-          return '/' + hostname.slice(lastPos + 63) + rest;
-        }
-      }
-      lastPos = i + 1;
-      continue;
-    } else if ((code >= 48/*0*/ && code <= 57/*9*/) ||
-               (code >= 97/*a*/ && code <= 122/*z*/) ||
-               code === 45/*-*/ ||
-               (code >= 65/*A*/ && code <= 90/*Z*/) ||
-               code === 43/*+*/ ||
-               code === 95/*_*/ ||
-               code > 127) {
-      continue;
-    }
+  for (var i = 0; i < hostname.length; ++i) {
+    const code = hostname.charCodeAt(i);
+    const isValid = (code >= 97/*a*/ && code <= 122/*z*/) ||
+                    code === 46/*.*/ ||
+                    (code >= 65/*A*/ && code <= 90/*Z*/) ||
+                    (code >= 48/*0*/ && code <= 57/*9*/) ||
+                    code === 45/*-*/ ||
+                    code === 43/*+*/ ||
+                    code === 95/*_*/ ||
+                    code > 127;
+
     // Invalid host character
-    self.hostname = hostname.slice(0, i);
-    if (i < hostname.length)
+    if (!isValid) {
+      self.hostname = hostname.slice(0, i);
       return '/' + hostname.slice(i) + rest;
-    break;
+    }
   }
 }
 

test/parallel/test-url.js

@@ -1225,6 +1225,17 @@ var formatTests = {
     path: '/node'
   },
 
+   // greater than or equal to 63 characters after `.` in hostname
+  [`http://www.${'z'.repeat(63)}example.com/node`]: {
+    href: `http://www.${'z'.repeat(63)}example.com/node`,
+    protocol: 'http:',
+    slashes: true,
+    host: `www.${'z'.repeat(63)}example.com`,
+    hostname: `www.${'z'.repeat(63)}example.com`,
+    pathname: '/node',
+    path: '/node'
+  },
+
   // https://github.com/nodejs/node/issues/3361
   'file:///home/user': {
     href: 'file:///home/user',