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<?php
/**
* class-groups-cache.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 1.9.0
*/
if ( !defined( 'ABSPATH' ) ) {
exit;
}
/**
* Cache service.
*
* Uses cache objects to encapsulate cached data.
*
* This makes us completely independent from the problems related to
* incomplete cache implementations that ignore the $found parameter used
* to disambiguate cache misses with wp_cache_get() when false is retrieved.
*/
class Groups_Cache {
/**
* Default cache group.
*
* @var string
*/
const CACHE_GROUP = 'groups';
/**
* Cache group specializer, use the user's groups.
*
* @since 2.20.0
*
* @var int
*/
const GROUPS_CACHE_GROUP = 0x01;
/**
* Cache group specializer, use the user's roles.
*
* @since 2.20.0
*
* @var int
*/
const ROLES_CACHE_GROUP = 0x02;
/**
* Cache group specializer, use the user's ID.
*
* @since 2.20.0
*
* @var int
*/
const USER_CACHE_GROUP = 0x04;
/**
* Retrieve an entry from cache.
*
* @param string $key
* @param string $group
*
* @return Groups_Cache_Object|null returns a cache object on hit, null on cache miss
*/
public static function get( $key, $group = self::CACHE_GROUP ) {
$found = null;
$value = wp_cache_get( $key, $group, false, $found );
if ( !( $value instanceof Groups_Cache_Object ) ) {
$value = null;
}
return $value;
}
/**
* Store an entry in cache.
*
* @param string $key
* @param string $value
* @param string $group
*
* @return boolean true if successful, otherwise false
*/
public static function set( $key, $value, $group = self::CACHE_GROUP ) {
$object = new Groups_Cache_Object( $key, $value );
return wp_cache_set( $key, $object, $group );
}
/**
* Delete a cache entry.
*
* @param string $key
* @param string $group
*
* @return boolean true if successful, otherwise false
*/
public static function delete( $key, $group = self::CACHE_GROUP ) {
return wp_cache_delete( $key, $group );
}
/**
* Provide a specialized (groups-roles-user-based) version of the $group key.
*
* The $flags parameter is self::GROUPS_CACHE_GROUP | self::ROLES_CACHE_GROUP by default,
* meaning a user's groups and roles are used to specialize the $group key.
*
* @since 2.20.0
*
* @param string $group group key
* @param int $flags determines what to take into account, null uses groups and roles by default
*
* @return string
*/
public static function get_group( $group, $flags = null ) {
if ( $flags === null ) {
$flags = self::GROUPS_CACHE_GROUP | self::ROLES_CACHE_GROUP;
}
$group_ids = array();
$roles = array();
$user_id = null;
if ( function_exists( 'wp_get_current_user' ) ) {
$user = wp_get_current_user();
if ( $user->exists() ) {
if ( $flags & self::GROUPS_CACHE_GROUP ) {
if ( is_array( $user->roles ) ) {
$roles = $user->roles;
sort( $roles );
}
}
if ( $flags & self::ROLES_CACHE_GROUP ) {
if ( class_exists( '\Groups_User' ) ) {
$groups_user = new \Groups_User( $user->ID );
$group_ids = $groups_user->get_group_ids_deep();
$group_ids = array_map( 'intval', $group_ids );
sort( $group_ids, SORT_NUMERIC );
}
}
if ( $flags & self::USER_CACHE_GROUP ) {
$user_id = $user->ID;
}
}
}
if ( count( $roles ) > 0 ) {
$group .= '_';
$group .= implode( '_', $roles );
}
if ( count( $group_ids ) > 0 ) {
$group .= '_';
$group .= implode( '_', $group_ids );
}
if ( $user_id !== null ) {
$group .= '_';
$group .= $user_id;
}
/**
* Additional specialization if needed by third-party extensions.
*
* @param string $suffix
* @param string $group
* @param int $flags
*
* @var string $group_suffix
*/
$group_suffix = apply_filters( 'groups_cache_group_suffix', '', $group, $flags );
if ( !is_string( $group_suffix ) ) {
$group_suffix = '';
} else {
$group_suffix = trim( $group_suffix );
}
if ( strlen( $group_suffix ) > 0 ) {
$group = $group . '_' . $group_suffix;
}
return $group;
}
}