[wp-trac] [WordPress Trac] #31992: Unicode Email Addresses

[WordPress Trac]

#31992: Unicode Email Addresses
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 Reporter:  ysalame       |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:
Component:  Formatting    |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  is-email      |     Focuses:
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Comment (by prfidneai):

 Hi!

 I opened #51732 ticket to propose a patch to change email validation rules
 to work with EAI, but it was recognized a duplicate of this one.

 As I can se nothing was changed with EAI for 6 years from the time this
 ticket was open and Unicode EAI cannot be used in WP.  I would like to
 propose some things to fix it:

 1)      Let's modify sanitize_email() and is_email() to use special
 constants for regex check username and domain name WP_IDN_LOCAL_MAIL_REGEX
 and  WP_IDN_DOMAIN_REGEX in default-constants.php which every admin can
 change to validate IDN domains rules for language he uses. For example I
 added Russian IDN rules to these regexes.

 2)      Let's also add decode_punycode() to sanitize_email() function
 which check if e-mail domain part in Punycode from and convert it to
 Unicode as required by uasg.tech

 3)      In addition to all these things  we can modify sanitize_user() in
 the same manner to allow Unicode usernames to WP Universal Acceptance
 ready.

 I attached the patch for all of these.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31992#comment:8>
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