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Multisite: Introduce a can_add_user_to_blog filter to prevent adding a user to a site.

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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.

Built from https://develop.svn.wordpress.org/trunk@41225


git-svn-id: http://core.svn.wordpress.org/trunk@41065 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Felix Arntz
2017-08-03 21:41:45 +00:00
parent 19aab9d3d6
commit 7e2ca92e69
5 changed files with 97 additions and 34 deletions
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5
wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
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@@ -492,7 +492,10 @@ class WP_REST_Users_Controller extends WP_REST_Controller {
return $user_id;
}
add_user_to_blog( get_site()->id, $user_id, '' );
$result= add_user_to_blog( get_site()->id, $user_id, '' );
if ( is_wp_error( $result ) ) {
return $result;
}
} else {
$user_id = wp_insert_user( wp_slash( (array) $user ) );