[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:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Users        |    Version:  trunk
 Severity:  normal       |   Keywords:
  Focuses:  multisite    |
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 In some multisite instances, we may want to establish a policy that only
 certain users may be added to a given blog.

 The current option available for preventing the addition of a user to a
 given blog is hooking into the `add_user_to_blog` action and undoing the
 user addition after it has already taken place. This is problematic
 because the user has already been added to the blog and any related
 actions may have already fired, depending on their priority.

 This introduces a filter to allow a plugin to override the addition of a
 user to a given blog. There is already precedent in `add_user_to_blog()`
 for returning a WP_Error if the user does not exist.

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