[wp-trac] [WordPress Trac] #41101: Add filter to prevent the addition of a user to a blog

[WordPress Trac]

#41101: Add filter to prevent the addition of a user to a blog
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 Reporter:  jmdodd                           |       Owner:  flixos90
     Type:  enhancement                      |      Status:  closed
 Priority:  normal                           |   Milestone:  4.9
Component:  Users                            |     Version:  trunk
 Severity:  normal                           |  Resolution:  fixed
 Keywords:  has-patch has-unit-tests commit  |     Focuses:  multisite
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Changes (by flixos90):

 * status:  reviewing => closed
 * resolution:   => fixed


Comment:

 In [changeset:"41225"]:
 {{{
 #!CommitTicketReference repository="" revision="41225"
 Multisite: Introduce a `can_add_user_to_blog` filter to prevent adding a
 user to a site.

 Under certain circumstances, it can be necessary that a user should not be
 added to a site, beyond the restrictions that WordPress core applies. With
 the new `can_add_user_to_blog` filter, plugin developers can run custom
 checks and return an error in case of a failure, that will prevent the
 user from being added.

 The user-facing parts and the REST API route that interact with
 `add_user_to_blog()` have been adjusted accordingly to provide appropriate
 error feedback when a user could not be added to a site. Furthermore, two
 existing error feedback messages in the site admin's "New User" screen
 have been adjusted to properly show inside an error notice instead of a
 success notice.

 Props jmdodd.
 Fixes #41101.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/41101#comment:12>
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