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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.

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
wp-admin/network/site-users.php
View File

@ -66,7 +66,11 @@ if ( $action ) {
if ( false === $user_id ) {
$update = 'err_new_dup';
} else {
add_user_to_blog( $id, $user_id, $_POST['new_role'] );
$result = add_user_to_blog( $id, $user_id, $_POST['new_role'] );
if ( is_wp_error( $result ) ) {
$update = 'err_add_fail';
} else {
$update = 'newuser';
/**
* Fires after a user has been created via the network site-users.php page.
@ -78,6 +82,7 @@ if ( $action ) {
do_action( 'network_site_users_created_user', $user_id );
}
}
}
break;
case 'adduser':
@ -87,10 +92,15 @@ if ( $action ) {
$newuser = $_POST['newuser'];
$user = get_user_by( 'login', $newuser );
if ( $user && $user->exists() ) {
if ( ! is_user_member_of_blog( $user->ID, $id ) )
add_user_to_blog( $id, $user->ID, $_POST['new_role'] );
else
if ( ! is_user_member_of_blog( $user->ID, $id ) ) {
$result = add_user_to_blog( $id, $user->ID, $_POST['new_role'] );
if ( is_wp_error( $result ) ) {
$update = 'err_add_fail';
}
} else {
$update = 'err_add_member';
}
} else {
$update = 'err_add_notfound';
}
@ -223,6 +233,9 @@ if ( isset($_GET['update']) ) :
case 'err_add_member':
echo '<div id="message" class="error notice is-dismissible"><p>' . __( 'User is already a member of this site.' ) . '</p></div>';
break;
case 'err_add_fail':
echo '<div id="message" class="error notice is-dismissible"><p>' . __( 'User could not be added to this site.' ) . '</p></div>';
break;
case 'err_add_notfound':
echo '<div id="message" class="error notice is-dismissible"><p>' . __( 'Enter the username of an existing user.' ) . '</p></div>';
break;

21
wp-admin/user-new.php
View File

@ -67,8 +67,13 @@ if ( isset($_REQUEST['action']) && 'adduser' == $_REQUEST['action'] ) {
$redirect = add_query_arg( array('update' => 'addexisting'), 'user-new.php' );
} else {
if ( isset( $_POST[ 'noconfirmation' ] ) && current_user_can( 'manage_network_users' ) ) {
add_existing_user_to_blog( array( 'user_id' => $user_id, 'role' => $_REQUEST[ 'role' ] ) );
$redirect = add_query_arg( array( 'update' => 'addnoconfirmation' , 'user_id' => $user_id ), 'user-new.php' );
$result = add_existing_user_to_blog( array( 'user_id' => $user_id, 'role' => $_REQUEST[ 'role' ] ) );
if ( ! is_wp_error( $result ) ) {
$redirect = add_query_arg( array( 'update' => 'addnoconfirmation', 'user_id' => $user_id ), 'user-new.php' );
} else {
$redirect = add_query_arg( array( 'update' => 'could_not_add' ), 'user-new.php' );
}
} else {
$newuser_key = substr( md5( $user_id ), 0, 5 );
add_option( 'new_user_' . $newuser_key, array( 'user_id' => $user_id, 'email' => $user_details->user_email, 'role' => $_REQUEST[ 'role' ] ) );
@ -157,6 +162,8 @@ Please click the following link to confirm the invite:
$new_user = wpmu_activate_signup( $key );
if ( is_wp_error( $new_user ) ) {
$redirect = add_query_arg( array( 'update' => 'addnoconfirmation' ), 'user-new.php' );
} elseif ( ! is_user_member_of_blog( $new_user['user_id'] ) ) {
$redirect = add_query_arg( array( 'update' => 'created_could_not_add' ), 'user-new.php' );
} else {
$redirect = add_query_arg( array( 'update' => 'addnoconfirmation', 'user_id' => $new_user['user_id'] ), 'user-new.php' );
}
@ -261,11 +268,17 @@ if ( isset($_GET['update']) ) {
case "addexisting":
$messages[] = __('That user is already a member of this site.');
break;
case "could_not_add":
$add_user_errors = new WP_Error( 'could_not_add', __( 'That user could not be added to this site.' ) );
break;
case "created_could_not_add":
$add_user_errors = new WP_Error( 'created_could_not_add', __( 'User has been created, but could not be added to this site.' ) );
break;
case "does_not_exist":
$messages[] = __('The requested user does not exist.');
$add_user_errors = new WP_Error( 'does_not_exist', __( 'The requested user does not exist.' ) );
break;
case "enter_email":
$messages[] = __('Please enter a valid email address.');
$add_user_errors = new WP_Error( 'enter_email', __( 'Please enter a valid email address.' ) );
break;
}
} else {

40
wp-includes/ms-functions.php
View File

@ -59,10 +59,13 @@ function get_active_blog_for_user( $user_id ) {
}
} else {
//TODO Review this call to add_user_to_blog too - to get here the user must have a role on this blog?
add_user_to_blog( $first_blog->userblog_id, $user_id, 'subscriber' );
$result = add_user_to_blog( $first_blog->userblog_id, $user_id, 'subscriber' );
if ( ! is_wp_error( $result ) ) {
update_user_meta( $user_id, 'primary_blog', $first_blog->userblog_id );
$primary = $first_blog;
}
}
if ( ( ! is_object( $primary ) ) || ( $primary->archived == 1 || $primary->spam == 1 || $primary->deleted == 1 ) ) {
$blogs = get_blogs_of_user( $user_id, true ); // if a user's primary blog is shut down, check their other blogs.
@ -160,6 +163,29 @@ function add_user_to_blog( $blog_id, $user_id, $role ) {
return new WP_Error( 'user_does_not_exist', __( 'The requested user does not exist.' ) );
}
/**
* Filters whether a user should be added to a site.
*
* @since 4.9.0
*
* @param bool|WP_Error $retval True if the user should be added to the site, false
* or error object otherwise.
* @param int $user_id User ID.
* @param string $role User role.
* @param int $blog_id Site ID.
*/
$can_add_user = apply_filters( 'can_add_user_to_blog', true, $user_id, $role, $blog_id );
if ( true !== $can_add_user ) {
restore_current_blog();
if ( is_wp_error( $can_add_user ) ) {
return $can_add_user;
}
return new WP_Error( 'user_cannot_be_added', __( 'User cannot be added to this site.' ) );
}
if ( !get_user_meta($user_id, 'primary_blog', true) ) {
update_user_meta($user_id, 'primary_blog', $blog_id);
$site = get_site( $blog_id );
@ -2081,6 +2107,8 @@ function add_existing_user_to_blog( $details = false ) {
if ( is_array( $details ) ) {
$blog_id = get_current_blog_id();
$result = add_user_to_blog( $blog_id, $details[ 'user_id' ], $details[ 'role' ] );
if ( ! is_wp_error( $result ) ) {
/**
* Fires immediately after an existing user is added to a site.
*
@ -2090,6 +2118,8 @@ function add_existing_user_to_blog( $details = false ) {
* @param mixed $result True on success or a WP_Error object if the user doesn't exist.
*/
do_action( 'added_existing_user', $details['user_id'], $result );
}
return $result;
}
}
@ -2111,10 +2141,14 @@ function add_new_user_to_blog( $user_id, $password, $meta ) {
if ( !empty( $meta[ 'add_to_blog' ] ) ) {
$blog_id = $meta[ 'add_to_blog' ];
$role = $meta[ 'new_role' ];
remove_user_from_blog($user_id, get_network()->site_id); // remove user from main blog.
add_user_to_blog( $blog_id, $user_id, $role );
remove_user_from_blog( $user_id, get_network()->site_id ); // remove user from main blog.
$result = add_user_to_blog( $blog_id, $user_id, $role );
if ( ! is_wp_error( $result ) ) {
update_user_meta( $user_id, 'primary_blog', $blog_id );
}
}
}
/**

5
wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
View File

@ -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 ) );

2
wp-includes/version.php
View File

@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
$wp_version = '4.9-alpha-41224';
$wp_version = '4.9-alpha-41225';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.