fixed #347 - added _ to the list of valid hostname chartacters

src/URI.js

@@ -207,7 +207,7 @@
   URI.escapeQuerySpace = true;
   // static properties
   URI.protocol_expression = /^[a-z][a-z0-9.+-]*$/i;
-  URI.idn_expression = /[^a-z0-9\.-]/i;
+  URI.idn_expression = /[^a-z0-9\._-]/i;
   URI.punycode_expression = /(xn--)/i;
   // well, 333.444.555.666 matches, but it sure ain't no IPv4 - do we care?
   URI.ip4_expression = /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/;
@@ -248,8 +248,8 @@
 
   // allowed hostname characters according to RFC 3986
   // ALPHA DIGIT "-" "." "_" "~" "!" "$" "&" "'" "(" ")" "*" "+" "," ";" "=" %encoded
-  // I've never seen a (non-IDN) hostname other than: ALPHA DIGIT . -
-  URI.invalid_hostname_characters = /[^a-zA-Z0-9\.\-:]/;
+  // I've never seen a (non-IDN) hostname other than: ALPHA DIGIT . - _
+  URI.invalid_hostname_characters = /[^a-zA-Z0-9\.\-:_]/;
   // map DOM Elements to their URI attribute
   URI.domAttributes = {
     'a': 'href',
@@ -1044,10 +1044,10 @@
     } else if (v && v.match(URI.invalid_hostname_characters)) {
       // test punycode
       if (!punycode) {
-        throw new TypeError('Hostname "' + v + '" contains characters other than [A-Z0-9.-] and Punycode.js is not available');
+        throw new TypeError('Hostname "' + v + '" contains characters other than [A-Z0-9.-:_] and Punycode.js is not available');
       }
       if (punycode.toASCII(v).match(URI.invalid_hostname_characters)) {
-        throw new TypeError('Hostname "' + v + '" contains characters other than [A-Z0-9.:-]');
+        throw new TypeError('Hostname "' + v + '" contains characters other than [A-Z0-9.-:_]');
       }
     }
   };

test/test.js

@@ -243,6 +243,10 @@
     equal(u.hostname(), 'abc.foobar.lala', 'hostname changed');
     equal(u+'', 'http://abc.foobar.lala/foo.html', 'hostname changed url');
 
+    u.hostname('some_where.exa_mple.org');
+    equal(u.hostname(), 'some_where.exa_mple.org', 'hostname changed');
+    equal(u+'', 'http://some_where.exa_mple.org/foo.html', 'hostname changed url');
+
     raises(function() {
       u.hostname('foo\\bar.com');
     }, TypeError, 'Failing backslash detection in hostname');
@@ -395,6 +399,11 @@
     equal(u.port(), '', 'host removed port');
     equal(u+'', 'http://some-domain.com/foo.html', 'host modified url');
 
+    u.host('some_where.exa_mple.org:44');
+    equal(u.hostname(), 'some_where.exa_mple.org', 'host modified hostname #2');
+    equal(u.port(), '44', 'port restored');
+    equal(u+'', 'http://some_where.exa_mple.org:44/foo.html', 'host modified url #2');
+
     raises(function() {
       u.host('foo\\bar.com');
     }, TypeError, 'Failing backslash detection in host');
@@ -524,6 +533,9 @@
     equal(u.hostname(), 'foo.example.org', 'changed subdomain foo.');
     equal(u+'', 'http://foo.example.org/foo.html', 'changed url foo.');
 
+    u.subdomain('foo_bar');
+    equal(u.hostname(), 'foo_bar.example.org', 'changed subdomain foo_bar');
+    equal(u+'', 'http://foo_bar.example.org/foo.html', 'changed url foo_bar');
   });
   test('domain', function() {
     var u = new URI('http://www.example.org/foo.html');
@@ -554,6 +566,13 @@
 
     u.subdomain('foo');
     equal(u.href(), 'http://foo.test/', 'subdomain set on (dot-less)');
+
+    u.subdomain('bar');
+    equal(u.href(), 'http://bar.foo.test/', 'subdomain set on foo.test');
+
+    u.domain('exam_ple.org');
+    equal(u.domain(), 'exam_ple.org', 'domain after changed domain exam_ple.org');
+    equal(u+'', 'http://bar.exam_ple.org/', 'url after changed domain exam_ple.org');
   });
   test('tld', function() {
     var u = new URI('http://www.example.org/foo.html');

test/urls.js

@@ -1112,6 +1112,55 @@ var urls = [{
       idn: false,
       punycode: false
     }
+  }, {
+    // https://github.com/medialize/URI.js/issues/347
+    name: 'Underscore in domain',
+    url: 'http://user:pass@some_where.exa_mple.org:123/some/directory/file.html?query=string#fragment',
+    parts: {
+      protocol: 'http',
+      username: 'user',
+      password: 'pass',
+      hostname: 'some_where.exa_mple.org',
+      port: '123',
+      path: '/some/directory/file.html',
+      query: 'query=string',
+      fragment: 'fragment'
+    },
+    accessors: {
+      protocol: 'http',
+      username: 'user',
+      password: 'pass',
+      port: '123',
+      path: '/some/directory/file.html',
+      query: 'query=string',
+      fragment: 'fragment',
+      resource: '/some/directory/file.html?query=string#fragment',
+      authority: 'user:pass@some_where.exa_mple.org:123',
+      origin: 'http://user:pass@some_where.exa_mple.org:123',
+      userinfo: 'user:pass',
+      subdomain: 'some_where',
+      domain: 'exa_mple.org',
+      tld: 'org',
+      directory: '/some/directory',
+      filename: 'file.html',
+      suffix: 'html',
+      hash: '#fragment',
+      search: '?query=string',
+      host: 'some_where.exa_mple.org:123',
+      hostname: 'some_where.exa_mple.org'
+    },
+    is: {
+      urn: false,
+      url: true,
+      relative: false,
+      name: true,
+      sld: false,
+      ip: false,
+      ip4: false,
+      ip6: false,
+      idn: false,
+      punycode: false
+    }
   }, {
     name: 'IDN (punycode)',
     url: 'http://user:pass@xn--exmple-cua.org:123/some/directory/file.html?query=string#fragment',