[wp-trac] [WordPress Trac] #58311: Validate Username for not to be a email and strip everything after @

[WordPress Trac]

#58311: Validate Username for not to be a email and strip everything after @
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 Reporter:  oglekler                             |       Owner:  (none)
     Type:  enhancement                          |      Status:  new
 Priority:  normal                               |   Milestone:  Awaiting
                                                 |  Review
Component:  Login and Registration               |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing needs-unit-  |     Focuses:
  tests 2nd-opinion                              |
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Comment (by knutsp):

 My cents.

 Since WordPress started to allow login by email, using a shared form and
 input field, this is the situation:

 Both usernames and user emails are unique. But one user account may have
 the exact same username as an other account's email. So, which account are
 you trying to log into, which password is to be checked and what user id
 to be assigned when successful?

 When a shared input field is used, allowing user names (user_login) not
 always being distinguishable from an email, is a bug.

 User names are also not allowed to change, by default. Users email may
 change. Allowing email as user name invites users to create new accounts
 when they change email, breaking author archives and order history for
 ecommerce.

 Creating new usernames that looks like emails, i.e. contains "@", should
 not be allowed from next major. Existing user names should not be
 affected. No BC break, just fixing a bug that allowed something that
 should never have been allowed, at least not after login by email was
 introduced.

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Ticket URL: <https://core.trac.wordpress.org/ticket/58311#comment:8>
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