Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 907 insertions, 0 deletions

diff --git a/wp-includes/class-wp-user.php b/wp-includes/class-wp-user.php
new file mode 100644
index 0000000..aa75980
--- /dev/null
+++ b/wp-includes/class-wp-user.php
@@ -0,0 +1,907 @@
+<?php
+/**
+ * User API: WP_User class
+ *
+ * @package WordPress
+ * @subpackage Users
+ * @since 4.4.0
+ */
+
+/**
+ * Core class used to implement the WP_User object.
+ *
+ * @since 2.0.0
+ *
+ * @property string $nickname
+ * @property string $description
+ * @property string $user_description
+ * @property string $first_name
+ * @property string $user_firstname
+ * @property string $last_name
+ * @property string $user_lastname
+ * @property string $user_login
+ * @property string $user_pass
+ * @property string $user_nicename
+ * @property string $user_email
+ * @property string $user_url
+ * @property string $user_registered
+ * @property string $user_activation_key
+ * @property string $user_status
+ * @property int    $user_level
+ * @property string $display_name
+ * @property string $spam
+ * @property string $deleted
+ * @property string $locale
+ * @property string $rich_editing
+ * @property string $syntax_highlighting
+ * @property string $use_ssl
+ */
+#[AllowDynamicProperties]
+class WP_User {
+	/**
+	 * User data container.
+	 *
+	 * @since 2.0.0
+	 * @var stdClass
+	 */
+	public $data;
+
+	/**
+	 * The user's ID.
+	 *
+	 * @since 2.1.0
+	 * @var int
+	 */
+	public $ID = 0;
+
+	/**
+	 * Capabilities that the individual user has been granted outside of those inherited from their role.
+	 *
+	 * @since 2.0.0
+	 * @var bool[] Array of key/value pairs where keys represent a capability name
+	 *             and boolean values represent whether the user has that capability.
+	 */
+	public $caps = array();
+
+	/**
+	 * User metadata option name.
+	 *
+	 * @since 2.0.0
+	 * @var string
+	 */
+	public $cap_key;
+
+	/**
+	 * The roles the user is part of.
+	 *
+	 * @since 2.0.0
+	 * @var string[]
+	 */
+	public $roles = array();
+
+	/**
+	 * All capabilities the user has, including individual and role based.
+	 *
+	 * @since 2.0.0
+	 * @var bool[] Array of key/value pairs where keys represent a capability name
+	 *             and boolean values represent whether the user has that capability.
+	 */
+	public $allcaps = array();
+
+	/**
+	 * The filter context applied to user data fields.
+	 *
+	 * @since 2.9.0
+	 * @var string
+	 */
+	public $filter = null;
+
+	/**
+	 * The site ID the capabilities of this user are initialized for.
+	 *
+	 * @since 4.9.0
+	 * @var int
+	 */
+	private $site_id = 0;
+
+	/**
+	 * @since 3.3.0
+	 * @var array
+	 */
+	private static $back_compat_keys;
+
+	/**
+	 * Constructor.
+	 *
+	 * Retrieves the userdata and passes it to WP_User::init().
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param int|string|stdClass|WP_User $id      User's ID, a WP_User object, or a user object from the DB.
+	 * @param string                      $name    Optional. User's username
+	 * @param int                         $site_id Optional Site ID, defaults to current site.
+	 */
+	public function __construct( $id = 0, $name = '', $site_id = '' ) {
+		if ( ! isset( self::$back_compat_keys ) ) {
+			$prefix                 = $GLOBALS['wpdb']->prefix;
+			self::$back_compat_keys = array(
+				'user_firstname'             => 'first_name',
+				'user_lastname'              => 'last_name',
+				'user_description'           => 'description',
+				'user_level'                 => $prefix . 'user_level',
+				$prefix . 'usersettings'     => $prefix . 'user-settings',
+				$prefix . 'usersettingstime' => $prefix . 'user-settings-time',
+			);
+		}
+
+		if ( $id instanceof WP_User ) {
+			$this->init( $id->data, $site_id );
+			return;
+		} elseif ( is_object( $id ) ) {
+			$this->init( $id, $site_id );
+			return;
+		}
+
+		if ( ! empty( $id ) && ! is_numeric( $id ) ) {
+			$name = $id;
+			$id   = 0;
+		}
+
+		if ( $id ) {
+			$data = self::get_data_by( 'id', $id );
+		} else {
+			$data = self::get_data_by( 'login', $name );
+		}
+
+		if ( $data ) {
+			$this->init( $data, $site_id );
+		} else {
+			$this->data = new stdClass();
+		}
+	}
+
+	/**
+	 * Sets up object properties, including capabilities.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param object $data    User DB row object.
+	 * @param int    $site_id Optional. The site ID to initialize for.
+	 */
+	public function init( $data, $site_id = '' ) {
+		if ( ! isset( $data->ID ) ) {
+			$data->ID = 0;
+		}
+		$this->data = $data;
+		$this->ID   = (int) $data->ID;
+
+		$this->for_site( $site_id );
+	}
+
+	/**
+	 * Returns only the main user fields.
+	 *
+	 * @since 3.3.0
+	 * @since 4.4.0 Added 'ID' as an alias of 'id' for the `$field` parameter.
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 *
+	 * @param string     $field The field to query against: 'id', 'ID', 'slug', 'email' or 'login'.
+	 * @param string|int $value The field value.
+	 * @return object|false Raw user object.
+	 */
+	public static function get_data_by( $field, $value ) {
+		global $wpdb;
+
+		// 'ID' is an alias of 'id'.
+		if ( 'ID' === $field ) {
+			$field = 'id';
+		}
+
+		if ( 'id' === $field ) {
+			// Make sure the value is numeric to avoid casting objects, for example, to int 1.
+			if ( ! is_numeric( $value ) ) {
+				return false;
+			}
+			$value = (int) $value;
+			if ( $value < 1 ) {
+				return false;
+			}
+		} else {
+			$value = trim( $value );
+		}
+
+		if ( ! $value ) {
+			return false;
+		}
+
+		switch ( $field ) {
+			case 'id':
+				$user_id  = $value;
+				$db_field = 'ID';
+				break;
+			case 'slug':
+				$user_id  = wp_cache_get( $value, 'userslugs' );
+				$db_field = 'user_nicename';
+				break;
+			case 'email':
+				$user_id  = wp_cache_get( $value, 'useremail' );
+				$db_field = 'user_email';
+				break;
+			case 'login':
+				$value    = sanitize_user( $value );
+				$user_id  = wp_cache_get( $value, 'userlogins' );
+				$db_field = 'user_login';
+				break;
+			default:
+				return false;
+		}
+
+		if ( false !== $user_id ) {
+			$user = wp_cache_get( $user_id, 'users' );
+			if ( $user ) {
+				return $user;
+			}
+		}
+
+		$user = $wpdb->get_row(
+			$wpdb->prepare(
+				"SELECT * FROM $wpdb->users WHERE $db_field = %s LIMIT 1",
+				$value
+			)
+		);
+		if ( ! $user ) {
+			return false;
+		}
+
+		update_user_caches( $user );
+
+		return $user;
+	}
+
+	/**
+	 * Magic method for checking the existence of a certain custom field.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param string $key User meta key to check if set.
+	 * @return bool Whether the given user meta key is set.
+	 */
+	public function __isset( $key ) {
+		if ( 'id' === $key ) {
+			_deprecated_argument(
+				'WP_User->id',
+				'2.1.0',
+				sprintf(
+					/* translators: %s: WP_User->ID */
+					__( 'Use %s instead.' ),
+					'<code>WP_User->ID</code>'
+				)
+			);
+			$key = 'ID';
+		}
+
+		if ( isset( $this->data->$key ) ) {
+			return true;
+		}
+
+		if ( isset( self::$back_compat_keys[ $key ] ) ) {
+			$key = self::$back_compat_keys[ $key ];
+		}
+
+		return metadata_exists( 'user', $this->ID, $key );
+	}
+
+	/**
+	 * Magic method for accessing custom fields.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param string $key User meta key to retrieve.
+	 * @return mixed Value of the given user meta key (if set). If `$key` is 'id', the user ID.
+	 */
+	public function __get( $key ) {
+		if ( 'id' === $key ) {
+			_deprecated_argument(
+				'WP_User->id',
+				'2.1.0',
+				sprintf(
+					/* translators: %s: WP_User->ID */
+					__( 'Use %s instead.' ),
+					'<code>WP_User->ID</code>'
+				)
+			);
+			return $this->ID;
+		}
+
+		if ( isset( $this->data->$key ) ) {
+			$value = $this->data->$key;
+		} else {
+			if ( isset( self::$back_compat_keys[ $key ] ) ) {
+				$key = self::$back_compat_keys[ $key ];
+			}
+			$value = get_user_meta( $this->ID, $key, true );
+		}
+
+		if ( $this->filter ) {
+			$value = sanitize_user_field( $key, $value, $this->ID, $this->filter );
+		}
+
+		return $value;
+	}
+
+	/**
+	 * Magic method for setting custom user fields.
+	 *
+	 * This method does not update custom fields in the database. It only stores
+	 * the value on the WP_User instance.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param string $key   User meta key.
+	 * @param mixed  $value User meta value.
+	 */
+	public function __set( $key, $value ) {
+		if ( 'id' === $key ) {
+			_deprecated_argument(
+				'WP_User->id',
+				'2.1.0',
+				sprintf(
+					/* translators: %s: WP_User->ID */
+					__( 'Use %s instead.' ),
+					'<code>WP_User->ID</code>'
+				)
+			);
+			$this->ID = $value;
+			return;
+		}
+
+		$this->data->$key = $value;
+	}
+
+	/**
+	 * Magic method for unsetting a certain custom field.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param string $key User meta key to unset.
+	 */
+	public function __unset( $key ) {
+		if ( 'id' === $key ) {
+			_deprecated_argument(
+				'WP_User->id',
+				'2.1.0',
+				sprintf(
+					/* translators: %s: WP_User->ID */
+					__( 'Use %s instead.' ),
+					'<code>WP_User->ID</code>'
+				)
+			);
+		}
+
+		if ( isset( $this->data->$key ) ) {
+			unset( $this->data->$key );
+		}
+
+		if ( isset( self::$back_compat_keys[ $key ] ) ) {
+			unset( self::$back_compat_keys[ $key ] );
+		}
+	}
+
+	/**
+	 * Determines whether the user exists in the database.
+	 *
+	 * @since 3.4.0
+	 *
+	 * @return bool True if user exists in the database, false if not.
+	 */
+	public function exists() {
+		return ! empty( $this->ID );
+	}
+
+	/**
+	 * Retrieves the value of a property or meta key.
+	 *
+	 * Retrieves from the users and usermeta table.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param string $key Property
+	 * @return mixed
+	 */
+	public function get( $key ) {
+		return $this->__get( $key );
+	}
+
+	/**
+	 * Determines whether a property or meta key is set.
+	 *
+	 * Consults the users and usermeta tables.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param string $key Property.
+	 * @return bool
+	 */
+	public function has_prop( $key ) {
+		return $this->__isset( $key );
+	}
+
+	/**
+	 * Returns an array representation.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @return array Array representation.
+	 */
+	public function to_array() {
+		return get_object_vars( $this->data );
+	}
+
+	/**
+	 * Makes private/protected methods readable for backward compatibility.
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param string $name      Method to call.
+	 * @param array  $arguments Arguments to pass when calling.
+	 * @return mixed|false Return value of the callback, false otherwise.
+	 */
+	public function __call( $name, $arguments ) {
+		if ( '_init_caps' === $name ) {
+			return $this->_init_caps( ...$arguments );
+		}
+		return false;
+	}
+
+	/**
+	 * Sets up capability object properties.
+	 *
+	 * Will set the value for the 'cap_key' property to current database table
+	 * prefix, followed by 'capabilities'. Will then check to see if the
+	 * property matching the 'cap_key' exists and is an array. If so, it will be
+	 * used.
+	 *
+	 * @since 2.1.0
+	 * @deprecated 4.9.0 Use WP_User::for_site()
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 *
+	 * @param string $cap_key Optional capability key
+	 */
+	protected function _init_caps( $cap_key = '' ) {
+		global $wpdb;
+
+		_deprecated_function( __METHOD__, '4.9.0', 'WP_User::for_site()' );
+
+		if ( empty( $cap_key ) ) {
+			$this->cap_key = $wpdb->get_blog_prefix( $this->site_id ) . 'capabilities';
+		} else {
+			$this->cap_key = $cap_key;
+		}
+
+		$this->caps = $this->get_caps_data();
+
+		$this->get_role_caps();
+	}
+
+	/**
+	 * Retrieves all of the capabilities of the user's roles, and merges them with
+	 * individual user capabilities.
+	 *
+	 * All of the capabilities of the user's roles are merged with the user's individual
+	 * capabilities. This means that the user can be denied specific capabilities that
+	 * their role might have, but the user is specifically denied.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @return bool[] Array of key/value pairs where keys represent a capability name
+	 *                and boolean values represent whether the user has that capability.
+	 */
+	public function get_role_caps() {
+		$switch_site = false;
+		if ( is_multisite() && get_current_blog_id() !== $this->site_id ) {
+			$switch_site = true;
+
+			switch_to_blog( $this->site_id );
+		}
+
+		$wp_roles = wp_roles();
+
+		// Filter out caps that are not role names and assign to $this->roles.
+		if ( is_array( $this->caps ) ) {
+			$this->roles = array_filter( array_keys( $this->caps ), array( $wp_roles, 'is_role' ) );
+		}
+
+		// Build $allcaps from role caps, overlay user's $caps.
+		$this->allcaps = array();
+		foreach ( (array) $this->roles as $role ) {
+			$the_role      = $wp_roles->get_role( $role );
+			$this->allcaps = array_merge( (array) $this->allcaps, (array) $the_role->capabilities );
+		}
+		$this->allcaps = array_merge( (array) $this->allcaps, (array) $this->caps );
+
+		if ( $switch_site ) {
+			restore_current_blog();
+		}
+
+		return $this->allcaps;
+	}
+
+	/**
+	 * Adds role to user.
+	 *
+	 * Updates the user's meta data option with capabilities and roles.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param string $role Role name.
+	 */
+	public function add_role( $role ) {
+		if ( empty( $role ) ) {
+			return;
+		}
+
+		if ( in_array( $role, $this->roles, true ) ) {
+			return;
+		}
+
+		$this->caps[ $role ] = true;
+		update_user_meta( $this->ID, $this->cap_key, $this->caps );
+		$this->get_role_caps();
+		$this->update_user_level_from_caps();
+
+		/**
+		 * Fires immediately after the user has been given a new role.
+		 *
+		 * @since 4.3.0
+		 *
+		 * @param int    $user_id The user ID.
+		 * @param string $role    The new role.
+		 */
+		do_action( 'add_user_role', $this->ID, $role );
+	}
+
+	/**
+	 * Removes role from user.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param string $role Role name.
+	 */
+	public function remove_role( $role ) {
+		if ( ! in_array( $role, $this->roles, true ) ) {
+			return;
+		}
+
+		unset( $this->caps[ $role ] );
+		update_user_meta( $this->ID, $this->cap_key, $this->caps );
+		$this->get_role_caps();
+		$this->update_user_level_from_caps();
+
+		/**
+		 * Fires immediately after a role as been removed from a user.
+		 *
+		 * @since 4.3.0
+		 *
+		 * @param int    $user_id The user ID.
+		 * @param string $role    The removed role.
+		 */
+		do_action( 'remove_user_role', $this->ID, $role );
+	}
+
+	/**
+	 * Sets the role of the user.
+	 *
+	 * This will remove the previous roles of the user and assign the user the
+	 * new one. You can set the role to an empty string and it will remove all
+	 * of the roles from the user.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param string $role Role name.
+	 */
+	public function set_role( $role ) {
+		if ( 1 === count( $this->roles ) && current( $this->roles ) === $role ) {
+			return;
+		}
+
+		foreach ( (array) $this->roles as $oldrole ) {
+			unset( $this->caps[ $oldrole ] );
+		}
+
+		$old_roles = $this->roles;
+
+		if ( ! empty( $role ) ) {
+			$this->caps[ $role ] = true;
+			$this->roles         = array( $role => true );
+		} else {
+			$this->roles = array();
+		}
+
+		update_user_meta( $this->ID, $this->cap_key, $this->caps );
+		$this->get_role_caps();
+		$this->update_user_level_from_caps();
+
+		foreach ( $old_roles as $old_role ) {
+			if ( ! $old_role || $old_role === $role ) {
+				continue;
+			}
+
+			/** This action is documented in wp-includes/class-wp-user.php */
+			do_action( 'remove_user_role', $this->ID, $old_role );
+		}
+
+		if ( $role && ! in_array( $role, $old_roles, true ) ) {
+			/** This action is documented in wp-includes/class-wp-user.php */
+			do_action( 'add_user_role', $this->ID, $role );
+		}
+
+		/**
+		 * Fires after the user's role has changed.
+		 *
+		 * @since 2.9.0
+		 * @since 3.6.0 Added $old_roles to include an array of the user's previous roles.
+		 *
+		 * @param int      $user_id   The user ID.
+		 * @param string   $role      The new role.
+		 * @param string[] $old_roles An array of the user's previous roles.
+		 */
+		do_action( 'set_user_role', $this->ID, $role, $old_roles );
+	}
+
+	/**
+	 * Chooses the maximum level the user has.
+	 *
+	 * Will compare the level from the $item parameter against the $max
+	 * parameter. If the item is incorrect, then just the $max parameter value
+	 * will be returned.
+	 *
+	 * Used to get the max level based on the capabilities the user has. This
+	 * is also based on roles, so if the user is assigned the Administrator role
+	 * then the capability 'level_10' will exist and the user will get that
+	 * value.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param int    $max  Max level of user.
+	 * @param string $item Level capability name.
+	 * @return int Max Level.
+	 */
+	public function level_reduction( $max, $item ) {
+		if ( preg_match( '/^level_(10|[0-9])$/i', $item, $matches ) ) {
+			$level = (int) $matches[1];
+			return max( $max, $level );
+		} else {
+			return $max;
+		}
+	}
+
+	/**
+	 * Updates the maximum user level for the user.
+	 *
+	 * Updates the 'user_level' user metadata (includes prefix that is the
+	 * database table prefix) with the maximum user level. Gets the value from
+	 * the all of the capabilities that the user has.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 */
+	public function update_user_level_from_caps() {
+		global $wpdb;
+		$this->user_level = array_reduce( array_keys( $this->allcaps ), array( $this, 'level_reduction' ), 0 );
+		update_user_meta( $this->ID, $wpdb->get_blog_prefix() . 'user_level', $this->user_level );
+	}
+
+	/**
+	 * Adds capability and grant or deny access to capability.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param string $cap   Capability name.
+	 * @param bool   $grant Whether to grant capability to user.
+	 */
+	public function add_cap( $cap, $grant = true ) {
+		$this->caps[ $cap ] = $grant;
+		update_user_meta( $this->ID, $this->cap_key, $this->caps );
+		$this->get_role_caps();
+		$this->update_user_level_from_caps();
+	}
+
+	/**
+	 * Removes capability from user.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param string $cap Capability name.
+	 */
+	public function remove_cap( $cap ) {
+		if ( ! isset( $this->caps[ $cap ] ) ) {
+			return;
+		}
+		unset( $this->caps[ $cap ] );
+		update_user_meta( $this->ID, $this->cap_key, $this->caps );
+		$this->get_role_caps();
+		$this->update_user_level_from_caps();
+	}
+
+	/**
+	 * Removes all of the capabilities of the user.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 */
+	public function remove_all_caps() {
+		global $wpdb;
+		$this->caps = array();
+		delete_user_meta( $this->ID, $this->cap_key );
+		delete_user_meta( $this->ID, $wpdb->get_blog_prefix() . 'user_level' );
+		$this->get_role_caps();
+	}
+
+	/**
+	 * Returns whether the user has the specified capability.
+	 *
+	 * This function also accepts an ID of an object to check against if the capability is a meta capability. Meta
+	 * capabilities such as `edit_post` and `edit_user` are capabilities used by the `map_meta_cap()` function to
+	 * map to primitive capabilities that a user or role has, such as `edit_posts` and `edit_others_posts`.
+	 *
+	 * Example usage:
+	 *
+	 *     $user->has_cap( 'edit_posts' );
+	 *     $user->has_cap( 'edit_post', $post->ID );
+	 *     $user->has_cap( 'edit_post_meta', $post->ID, $meta_key );
+	 *
+	 * While checking against a role in place of a capability is supported in part, this practice is discouraged as it
+	 * may produce unreliable results.
+	 *
+	 * @since 2.0.0
+	 * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
+	 *              by adding it to the function signature.
+	 *
+	 * @see map_meta_cap()
+	 *
+	 * @param string $cap     Capability name.
+	 * @param mixed  ...$args Optional further parameters, typically starting with an object ID.
+	 * @return bool Whether the user has the given capability, or, if an object ID is passed, whether the user has
+	 *              the given capability for that object.
+	 */
+	public function has_cap( $cap, ...$args ) {
+		if ( is_numeric( $cap ) ) {
+			_deprecated_argument( __FUNCTION__, '2.0.0', __( 'Usage of user levels is deprecated. Use capabilities instead.' ) );
+			$cap = $this->translate_level_to_cap( $cap );
+		}
+
+		$caps = map_meta_cap( $cap, $this->ID, ...$args );
+
+		// Multisite super admin has all caps by definition, Unless specifically denied.
+		if ( is_multisite() && is_super_admin( $this->ID ) ) {
+			if ( in_array( 'do_not_allow', $caps, true ) ) {
+				return false;
+			}
+			return true;
+		}
+
+		// Maintain BC for the argument passed to the "user_has_cap" filter.
+		$args = array_merge( array( $cap, $this->ID ), $args );
+
+		/**
+		 * Dynamically filter a user's capabilities.
+		 *
+		 * @since 2.0.0
+		 * @since 3.7.0 Added the `$user` parameter.
+		 *
+		 * @param bool[]   $allcaps Array of key/value pairs where keys represent a capability name
+		 *                          and boolean values represent whether the user has that capability.
+		 * @param string[] $caps    Required primitive capabilities for the requested capability.
+		 * @param array    $args {
+		 *     Arguments that accompany the requested capability check.
+		 *
+		 *     @type string    $0 Requested capability.
+		 *     @type int       $1 Concerned user ID.
+		 *     @type mixed  ...$2 Optional second and further parameters, typically object ID.
+		 * }
+		 * @param WP_User  $user    The user object.
+		 */
+		$capabilities = apply_filters( 'user_has_cap', $this->allcaps, $caps, $args, $this );
+
+		// Everyone is allowed to exist.
+		$capabilities['exist'] = true;
+
+		// Nobody is allowed to do things they are not allowed to do.
+		unset( $capabilities['do_not_allow'] );
+
+		// Must have ALL requested caps.
+		foreach ( (array) $caps as $cap ) {
+			if ( empty( $capabilities[ $cap ] ) ) {
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	/**
+	 * Converts numeric level to level capability name.
+	 *
+	 * Prepends 'level_' to level number.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param int $level Level number, 1 to 10.
+	 * @return string
+	 */
+	public function translate_level_to_cap( $level ) {
+		return 'level_' . $level;
+	}
+
+	/**
+	 * Sets the site to operate on. Defaults to the current site.
+	 *
+	 * @since 3.0.0
+	 * @deprecated 4.9.0 Use WP_User::for_site()
+	 *
+	 * @param int $blog_id Optional. Site ID, defaults to current site.
+	 */
+	public function for_blog( $blog_id = '' ) {
+		_deprecated_function( __METHOD__, '4.9.0', 'WP_User::for_site()' );
+
+		$this->for_site( $blog_id );
+	}
+
+	/**
+	 * Sets the site to operate on. Defaults to the current site.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 *
+	 * @param int $site_id Site ID to initialize user capabilities for. Default is the current site.
+	 */
+	public function for_site( $site_id = '' ) {
+		global $wpdb;
+
+		if ( ! empty( $site_id ) ) {
+			$this->site_id = absint( $site_id );
+		} else {
+			$this->site_id = get_current_blog_id();
+		}
+
+		$this->cap_key = $wpdb->get_blog_prefix( $this->site_id ) . 'capabilities';
+
+		$this->caps = $this->get_caps_data();
+
+		$this->get_role_caps();
+	}
+
+	/**
+	 * Gets the ID of the site for which the user's capabilities are currently initialized.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @return int Site ID.
+	 */
+	public function get_site_id() {
+		return $this->site_id;
+	}
+
+	/**
+	 * Gets the available user capabilities data.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @return bool[] List of capabilities keyed by the capability name,
+	 *                e.g. `array( 'edit_posts' => true, 'delete_posts' => false )`.
+	 */
+	private function get_caps_data() {
+		$caps = get_user_meta( $this->ID, $this->cap_key, true );
+
+		if ( ! is_array( $caps ) ) {
+			return array();
+		}
+
+		return $caps;
+	}
+}