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<?php
/**
* class-groups-wordpress.php
*
* Copyright (c) "kento" Karim Rahimpur www.itthinx.com
*
* This code is released under the GNU General Public License.
* See COPYRIGHT.txt and LICENSE.txt.
*
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This header and all notices must be kept intact.
*
* @author Karim Rahimpur
* @package groups
* @since groups 1.0.0
*/
if ( !defined( 'ABSPATH' ) ) {
exit;
}
/**
* WordPress capabilities integration.
*/
class Groups_WordPress {
/**
* Cache group
*
* @var string
*/
const CACHE_GROUP = 'groups';
/**
* Cache key prefix
*
* @var string
*/
const HAS_CAP = 'has_cap';
/**
* Filter priority: groups_user_can
*
* @var integer
*
* @since 2.11.0
*/
const GROUPS_USER_CAN_FILTER_PRIORITY = 10;
/**
* Filter priority: user_has_cap
*
* @var int
*
* @since 2.11.0
*/
const USER_HAS_CAP_FILTER_PRIORITY = PHP_INT_MAX;
/**
* Hook into actions to extend user capabilities.
*
* @todo We might want to keep up with new capabilities when added, so
* that others don't have to add these explicitly to Groups when they
* add them to WordPress. Currently there's no hook for when a capability
* is added and checking this in any other way is too costly.
*/
public static function init() {
// args: boolean $result, Groups_User $groups_user, string $capability
add_filter( 'groups_user_can', array( __CLASS__, 'groups_user_can' ), self::GROUPS_USER_CAN_FILTER_PRIORITY, 5 );
add_filter( 'user_has_cap', array( __CLASS__, 'user_has_cap' ), self::USER_HAS_CAP_FILTER_PRIORITY, 4 );
}
/**
* Whether the given user has the capability.
*
* Calls Groups_User::user_can() with user_has_cap and groups_user_can filters temporarily removed.
*
* @since 3.1.0
*
* @param int|WP_User $user user ID or object
* @param string $capability capability name
* @param mixed ...$args optional parameters, typically an object ID
*
* @return boolean
*/
private static function unfiltered_user_can( $user, $capability, ...$args ) {
// We want to check without the capabilities granted to the user via groups.
// Groups_User::user_can() relies on user_can() or WP_User->has_cap() in the absense of the former,
// which will cause our user_has_cap filter to act so we have to remove it temporarily.
// To avoid potential internal conflicts or cicular dependencies, we also remove the groups_user_can filter which
// relies on this method.
$result = false;
$filter_user_has_cap = remove_filter( 'user_has_cap', array( __CLASS__, 'user_has_cap' ), self::USER_HAS_CAP_FILTER_PRIORITY ); // @since 3.1.0
$filter_groups_user_can = remove_filter( 'groups_user_can', array( __CLASS__, 'groups_user_can' ), self::GROUPS_USER_CAN_FILTER_PRIORITY ); // @since 3.1.0
$result = Groups_User::user_can( $user, $capability, ...$args );
if ( $filter_user_has_cap ) {
add_filter( 'user_has_cap', array( __CLASS__, 'user_has_cap' ), self::USER_HAS_CAP_FILTER_PRIORITY, 4 );
}
if ( $filter_groups_user_can ) {
add_filter( 'groups_user_can', array( __CLASS__, 'groups_user_can' ), self::GROUPS_USER_CAN_FILTER_PRIORITY, 5 );
}
return $result;
}
/**
* Extends Groups user capability with its WP_User capability.
*
* @param boolean $result
* @param Groups_User $groups_user
* @param string $capability
* @param mixed $object
* @param mixed $args
*
* @return boolean
*/
public static function groups_user_can( $result, $groups_user, $capability, $object, $args ) {
// The intention here is to complement capabilities from groups with those from the user.
// Our user_has_cap filter extends user capabilities with those from groups, i.e. the reverse complementary.
// Thus, our user_has_cap filter should not be involved here. Also, we want to avoid any potential circular
// dependency which could arise from having our groups_user_can fired again while we attend to that action here.
// To avoid any potential hickups, we also remove the filter while we handle it.
$filter_groups_user_can = remove_filter( 'groups_user_can', array( __CLASS__, 'groups_user_can' ), self::GROUPS_USER_CAN_FILTER_PRIORITY ); // @since 3.1.0
if ( !$result ) {
// Check if the capability exists, otherwise this will
// produce a deprecation warning "Usage of user levels by plugins
// and themes is deprecated", not because we actually use a
// deprecated user level, but because it doesn't exist.
if ( Groups_Capability::read_by_capability( $capability ) ) {
if ( $groups_user instanceof Groups_User ) {
$user_id = $groups_user->get_user_id();
if ( $user_id !== null ) {
if ( $object === null ) {
$result = self::unfiltered_user_can( $user_id, $capability );
} else {
// @since 3.0.0
$object_id = null;
if ( is_numeric( $object ) ) {
$object_id = Groups_Utility::id( $object_id );
} else if ( is_object( $object ) && method_exists( $object, 'get_id' ) ) {
$object_id = $object->get_id();
}
// PHP >= 8.1.0 named arguments can be used after unpacking ...$args
// With prior PHP versions, the order in which values appear in an $args array
// determines the order of the parameters passed.
if ( $object_id !== null ) {
$result = self::unfiltered_user_can( $user_id, $capability, $object_id, ...$args );
} else {
$result = self::unfiltered_user_can( $user_id, $capability, $object, ...$args );
}
}
}
}
}
}
if ( $filter_groups_user_can ) {
add_filter( 'groups_user_can', array( __CLASS__, 'groups_user_can' ), self::GROUPS_USER_CAN_FILTER_PRIORITY, 5 ); // @since 3.1.0
}
return $result;
}
/**
* Extend user capabilities with Groups user capabilities.
*
* @param array $allcaps the capabilities the user has
* @param array $caps the requested capabilities
* @param array $args capability context which can provide the requested capability as $args[0], the user ID as $args[1] and the related object's ID as $args[2]
* @param WP_User $user the user object
*
* @return array
*/
public static function user_has_cap( $allcaps, $caps, $args, $user ) {
if ( is_array( $caps ) ) {
$user_id = 0;
if ( isset( $user->ID ) ) {
$user_id = intval( $user->ID );
} else if ( isset( $args[1] ) ) {
$user_id = intval( $args[1] );
}
$hash = md5( json_encode( $caps ) . json_encode( $args ) ); // phpcs:ignore WordPress.WP.AlternativeFunctions.json_encode_json_encode
$cached = Groups_Cache::get( self::HAS_CAP . '_' . $user_id . '_' . $hash, self::CACHE_GROUP );
if ( $cached !== null ) {
$_allcaps = $cached->value;
unset( $cached );
// Capabilities that were added after our value was cached must be added and
// those entries that provide different values must be adopted. This is necessary
// because other filters which hook into user_has_cap might have added or modified
// things after we had already cached the values.
foreach ( $allcaps as $cap => $value ) {
if (
!key_exists( $cap, $_allcaps ) ||
$_allcaps[$cap] !== $value
) {
$_allcaps[$cap] = $value;
}
}
$allcaps = $_allcaps;
} else {
$groups_user = new Groups_User( $user_id );
// we need to deactivate this because invoking $groups_user->can()
// would trigger this same function and we would end up
// in an infinite loop
remove_filter( 'user_has_cap', array( __CLASS__, 'user_has_cap' ), self::USER_HAS_CAP_FILTER_PRIORITY );
foreach( $caps as $cap ) {
if ( $groups_user->can( $cap ) ) {
$allcaps[$cap] = true;
}
}
add_filter( 'user_has_cap', array( __CLASS__, 'user_has_cap' ), self::USER_HAS_CAP_FILTER_PRIORITY, 4 );
Groups_Cache::set( self::HAS_CAP . '_' . $user_id . '_' . $hash, $allcaps, self::CACHE_GROUP );
}
}
$allcaps = apply_filters( 'groups_user_has_cap', $allcaps, $caps, $args, $user );
return $allcaps;
}
/**
* Adds WordPress capabilities to Groups capabilities.
* Must be called explicitly.
*
* @see Groups_Controller::activate()
*/
public static function activate() {
self::refresh_capabilities();
}
/**
* Refreshes Groups capabilities based on WordPress capabilities.
*
* @return int number of capabilities added
*/
public static function refresh_capabilities() {
global $wp_roles;
$capabilities = array();
$count = 0;
if ( !isset( $wp_roles ) ) {
// just trigger initialization
get_role( 'administrator' );
}
$roles = $wp_roles->roles;
if ( is_array( $roles ) ) {
foreach ( $roles as $rolename => $atts ) {
if ( isset( $atts['capabilities'] ) && is_array( $atts['capabilities'] ) ) {
foreach ( $atts['capabilities'] as $capability => $value ) {
if ( !in_array( $capability, $capabilities ) ) {
$capabilities[] = $capability;
}
}
}
}
}
foreach ( $capabilities as $capability ) {
if ( !Groups_Capability::read_by_capability( $capability ) ) {
Groups_Capability::create( array( 'capability' => $capability ) );
$count++;
}
}
return $count;
}
}
Groups_WordPress::init();