Sites with IDN domains can't be created

[SergeyBiryukov]

When I try to create a new site with any valid IDN domain in Multisite, I get “Missing or invalid site address” error.

I found the line in ms-edit.php from r13630 which causes the problem:

if ( ! preg_match( '/(--)/', $blog['domain'] ) && preg_match( '|^([a-zA-Z0-9-])+$|', $blog['domain'] ) )
	$domain = strtolower( $blog['domain'] );

What is the purpose of the first check? When I remove it and leave only the second one, the site is added correctly.

Also, is it possible convert a domain name to Punycode automatically from UTF-8?

[SergeyBiryukov]

Related: #11777

[mdawaffe]

The -- check may be to prevent IDNs, since there's probably some bugs elsewhere. If that's the case, I agree it's not a good long term solution :) Maybe wpmuguru can chime in and provide more info.

Yes, punycode conversion is possible in PHP.

Natively: ​http://us.php.net/manual/en/ref.intl.idn.php (PHP 5.3+ or PECL)

PEAR: ​http://pear.php.net/package/Net_IDNA2

[wpmuguru]

Prior to writing that patch, I did some research on domain name rules. The resource I found indicated that two - were not allowed together. That might have been out of date & I didn't catch it.

There should be no harm from a WP perspective to remove that -- check. We should also test the blog lookup and verify that it works ok with two or more - together. I'll do a sanity check on that and update the ticket.

[wpmuguru]

I didn't do an exhaustive amount of testing, but I didn't have any issues with either a subdomain or subfolder install and a blogname with -- in the middle of it.

rewrites worked
permalinks worked
admin area was fine

Early 3.2?

[wpmuguru]

We'd make a few people happy if this one was rolled into 3.2.

[wpmuguru]

The patch is still good.

[ryan]

In [18473]:

Allow creating sites with IDN domains. Props SergeyBiryukov, wpmuguru. fixes #15554

[qdinar]

​http://codex.wordpress.org/Version_3.3#Install_Process "Allow creating sites with IDN domains"

this is not true. i cannot register a site (from fresh firefox profile). probably ms-edit.php is not used in user registration by themself.

should be new bug opened or this reopened? (somebody open/reopen yourself or say to me to open/reopen)

[qdinar]

i will attach differences that i made to make my блогы.рф working , when it was 3.0.4 . i have reinstalled os and wordpress, and idn in the site do not work now.

i reopen this bug (or try, selecting it), because heading and first post and all thread are good for that.

[qdinar]

make idn working

[ocean90]

Since this ticket was marked as fixed for a shipped milestone, please open a new ticket and reference this one.

[qdinar]

new ticket: #19724