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Roles/Caps: Return same result from current_user_can and user_can().

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Ensure `current_user_can()` and `user_can()` return the same results for logged out users. For core capabilities this changes `user_can( 0, 'exist' )` to return `true` rather than `false` in line with `current_user_can( 'exist' )` for logged out users.

Convert `current_user_can()` and `current_user_can_for_blog()` to wrapper functions ultimately calling `user_can()`.

Add anonymous user to primitive capability checks as appropriate. Convert `Tests_User_Capabilities::test_other_caps_for_all_roles()` to use a data provider and add tests to check whether user exists in the database (`WP_User::exists()`) as that intentionally differs from the `exist` capability.

Props jjj, johnbillion, peterwilsoncc, SergeyBiryukov, TimothyBlynJacobs.
Fixes #52076.



git-svn-id: https://develop.svn.wordpress.org/trunk@50490 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Peter Wilson
2021-03-04 00:12:55 +00:00
parent 58fff52e45
commit f2779be7f0
3 changed files with 96 additions and 44 deletions
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src/wp-includes/capabilities.php
+8 -19
View File
@@ -679,6 +679,7 @@ function map_meta_cap( $cap, $user_id, ...$args ) {
* @since 2.0.0
* @since 5.3.0 Formalized the existing and already documented `...$args` parameter
* by adding it to the function signature.
* @since 5.8.0 Converted to wrapper for the user_can() function.
*
* @see WP_User::has_cap()
* @see map_meta_cap()
@@ -689,13 +690,7 @@ function map_meta_cap( $cap, $user_id, ...$args ) {
* passed, whether the current user has the given meta capability for the given object.
*/
function current_user_can( $capability, ...$args ) {
$current_user = wp_get_current_user();
if ( empty( $current_user ) ) {
return false;
}
return $current_user->has_cap( $capability, ...$args );
return user_can( wp_get_current_user(), $capability, ...$args );
}
/**
@@ -714,6 +709,7 @@ function current_user_can( $capability, ...$args ) {
* @since 3.0.0
* @since 5.3.0 Formalized the existing and already documented `...$args` parameter
* by adding it to the function signature.
* @since 5.8.0 Wraps current_user_can() after switching to blog.
*
* @param int $blog_id Site ID.
* @param string $capability Capability name.
@@ -723,16 +719,7 @@ function current_user_can( $capability, ...$args ) {
function current_user_can_for_blog( $blog_id, $capability, ...$args ) {
$switched = is_multisite() ? switch_to_blog( $blog_id ) : false;
$current_user = wp_get_current_user();
if ( empty( $current_user ) ) {
if ( $switched ) {
restore_current_blog();
}
return false;
}
$can = $current_user->has_cap( $capability, ...$args );
$can = current_user_can( $capability, ...$args );
if ( $switched ) {
restore_current_blog();
@@ -805,8 +792,10 @@ function user_can( $user, $capability, ...$args ) {
$user = get_userdata( $user );
}
if ( ! $user || ! $user->exists() ) {
return false;
if ( empty( $user ) ) {
// User is logged out, create anonymous user object.
$user = new WP_User( 0 );
$user->init( new stdClass );
}
return $user->has_cap( $capability, ...$args );