431 lines
9.8 KiB
PHP
431 lines
9.8 KiB
PHP
<?php
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/**
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* Abstract class for managing user session tokens.
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*
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* @since 4.0.0
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*/
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abstract class WP_Session_Tokens {
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/**
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* User ID.
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*
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* @since 4.0.0
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* @access protected
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* @var int User ID.
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*/
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protected $user_id;
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/**
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* Protected constructor.
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*
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* @since 4.0.0
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*
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* @param int $user_id User whose session to manage.
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*/
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protected function __construct( $user_id ) {
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$this->user_id = $user_id;
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}
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/**
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* Get a session token manager instance for a user.
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*
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* This method contains a filter that allows a plugin to swap out
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* the session manager for a subclass of WP_Session_Tokens.
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*
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* @since 4.0.0
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* @access public
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* @static
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*
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* @param int $user_id User whose session to manage.
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*/
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final public static function get_instance( $user_id ) {
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/**
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* Filter the session token manager used.
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*
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* @since 4.0.0
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*
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* @param string $session Name of class to use as the manager.
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* Default 'WP_User_Meta_Session_Tokens'.
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*/
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$manager = apply_filters( 'session_token_manager', 'WP_User_Meta_Session_Tokens' );
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return new $manager( $user_id );
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}
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/**
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* Hashes a session token for storage.
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*
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* @since 4.0.0
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* @access private
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*
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* @param string $token Session token to hash.
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* @return string A hash of the session token (a verifier).
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*/
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final private function hash_token( $token ) {
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// If ext/hash is not present, use sha1() instead.
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if ( function_exists( 'hash' ) ) {
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return hash( 'sha256', $token );
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} else {
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return sha1( $token );
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}
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}
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/**
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* Get a user's session.
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*
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* @since 4.0.0
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* @access public
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*
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* @param string $token Session token
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* @return array User session
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*/
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final public function get( $token ) {
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$verifier = $this->hash_token( $token );
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return $this->get_session( $verifier );
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}
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/**
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* Validate a user's session token as authentic.
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*
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* Checks that the given token is present and hasn't expired.
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*
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* @since 4.0.0
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* @access public
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*
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* @param string $token Token to verify.
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* @return bool Whether the token is valid for the user.
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*/
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final public function verify( $token ) {
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$verifier = $this->hash_token( $token );
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return (bool) $this->get_session( $verifier );
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}
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/**
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* Generate a session token and attach session information to it.
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*
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* A session token is a long, random string. It is used in a cookie
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* link that cookie to an expiration time and to ensure the cookie
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* becomes invalidated upon logout.
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*
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* This function generates a token and stores it with the associated
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* expiration time (and potentially other session information via the
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* `attach_session_information` filter).
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*
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* @since 4.0.0
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* @access public
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*
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* @param int $expiration Session expiration timestamp.
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* @return string Session token.
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*/
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final public function create( $expiration ) {
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/**
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* Filter the information attached to the newly created session.
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*
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* Could be used in the future to attach information such as
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* IP address or user agent to a session.
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*
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* @since 4.0.0
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*
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* @param array $session Array of extra data.
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* @param int $user_id User ID.
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*/
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$session = apply_filters( 'attach_session_information', array(), $this->user_id );
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$session['expiration'] = $expiration;
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$token = wp_generate_password( 43, false, false );
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$this->update( $token, $session );
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return $token;
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}
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/**
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* Update a session token.
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*
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* @since 4.0.0
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* @access public
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*
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* @param string $token Session token to update.
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* @param array $session Session information.
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*/
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final public function update( $token, $session ) {
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$verifier = $this->hash_token( $token );
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$this->update_session( $verifier, $session );
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}
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/**
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* Destroy a session token.
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*
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* @since 4.0.0
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* @access public
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*
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* @param string $token Session token to destroy.
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*/
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final public function destroy( $token ) {
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$verifier = $this->hash_token( $token );
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$this->update_session( $verifier, null );
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}
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/**
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* Destroy all session tokens for this user,
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* except a single token, presumably the one in use.
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*
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* @since 4.0.0
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* @access public
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*
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* @param string $token_to_keep Session token to keep.
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*/
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final public function destroy_others( $token_to_keep ) {
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$verifier = $this->hash_token( $token_to_keep );
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$session = $this->get_session( $verifier );
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if ( $session ) {
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$this->destroy_other_sessions( $verifier );
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} else {
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$this->destroy_all_sessions();
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}
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}
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/**
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* Determine whether a session token is still valid,
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* based on expiration.
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*
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* @since 4.0.0
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* @access protected
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*
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* @param array $session Session to check.
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* @return bool Whether session is valid.
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*/
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final protected function is_still_valid( $session ) {
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return $session['expiration'] >= time();
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}
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/**
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* Destroy all session tokens for a user.
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*
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* @since 4.0.0
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* @access public
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*/
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final public function destroy_all() {
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$this->destroy_all_sessions();
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}
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/**
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* Destroy all session tokens for all users.
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*
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* @since 4.0.0
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* @access public
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* @static
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*/
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final public static function destroy_all_for_all_users() {
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$manager = apply_filters( 'session_token_manager', 'WP_User_Meta_Session_Tokens' );
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call_user_func( array( $manager, 'drop_sessions' ) );
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}
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/**
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* Retrieve all sessions of a user.
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*
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* @since 4.0.0
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* @access public
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*
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* @return array Sessions of a user.
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*/
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final public function get_all() {
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return array_values( $this->get_sessions() );
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}
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/**
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* This method should retrieve all sessions of a user, keyed by verifier.
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*
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* @since 4.0.0
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* @access protected
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*
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* @return array Sessions of a user, keyed by verifier.
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*/
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abstract protected function get_sessions();
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/**
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* This method should look up a session by its verifier (token hash).
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*
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* @since 4.0.0
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* @access protected
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*
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* @param string $verifier Verifier of the session to retrieve.
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* @return array|null The session, or null if it does not exist.
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*/
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abstract protected function get_session( $verifier );
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/**
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* This method should update a session by its verifier.
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*
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* Omitting the second argument should destroy the session.
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*
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* @since 4.0.0
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* @access protected
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*
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* @param string $verifier Verifier of the session to update.
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*/
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abstract protected function update_session( $verifier, $session = null );
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/**
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* This method should destroy all session tokens for this user,
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* except a single session passed.
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*
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* @since 4.0.0
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* @access protected
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*
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* @param string $verifier Verifier of the session to keep.
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*/
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abstract protected function destroy_other_sessions( $verifier );
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/**
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* This method should destroy all sessions for a user.
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*
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* @since 4.0.0
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* @access protected
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*/
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abstract protected function destroy_all_sessions();
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/**
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* This static method should destroy all session tokens for all users.
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*
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* @since 4.0.0
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* @access public
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* @static
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*/
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public static function drop_sessions() {}
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}
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/**
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* Meta-based user sessions token manager.
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*
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* @since 4.0.0
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*/
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class WP_User_Meta_Session_Tokens extends WP_Session_Tokens {
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/**
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* Get all sessions of a user.
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*
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* @since 4.0.0
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* @access protected
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*
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* @return array Sessions of a user.
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*/
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protected function get_sessions() {
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$sessions = get_user_meta( $this->user_id, 'session_tokens', true );
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if ( ! is_array( $sessions ) ) {
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return array();
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}
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$sessions = array_map( array( $this, 'prepare_session' ), $sessions );
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return array_filter( $sessions, array( $this, 'is_still_valid' ) );
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}
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/**
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* Converts an expiration to an array of session information.
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*
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* @param mixed $session Session or expiration.
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* @return array Session.
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*/
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protected function prepare_session( $session ) {
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if ( is_int( $session ) ) {
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return array( 'expiration' => $session );
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}
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return $session;
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}
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/**
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* Retrieve a session by its verifier (token hash).
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*
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* @since 4.0.0
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* @access protected
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*
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* @param string $verifier Verifier of the session to retrieve.
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* @return array|null The session, or null if it does not exist
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*/
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protected function get_session( $verifier ) {
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$sessions = $this->get_sessions();
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if ( isset( $sessions[ $verifier ] ) ) {
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return $sessions[ $verifier ];
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}
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return null;
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}
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/**
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* Update a session by its verifier.
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*
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* @since 4.0.0
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* @access protected
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*
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* @param string $verifier Verifier of the session to update.
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* @param array $session Optional. Session. Omitting this argument destroys the session.
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*/
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protected function update_session( $verifier, $session = null ) {
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$sessions = $this->get_sessions();
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if ( $session ) {
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$sessions[ $verifier ] = $session;
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} else {
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unset( $sessions[ $verifier ] );
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}
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$this->update_sessions( $sessions );
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}
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/**
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* Update a user's sessions in the usermeta table.
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*
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* @since 4.0.0
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* @access protected
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*
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* @param array $sessions Sessions.
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*/
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protected function update_sessions( $sessions ) {
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if ( ! has_filter( 'attach_session_information' ) ) {
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$sessions = wp_list_pluck( $sessions, 'expiration' );
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}
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if ( $sessions ) {
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update_user_meta( $this->user_id, 'session_tokens', $sessions );
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} else {
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delete_user_meta( $this->user_id, 'session_tokens' );
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}
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}
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/**
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* Destroy all session tokens for a user, except a single session passed.
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*
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* @since 4.0.0
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* @access protected
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*
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* @param string $verifier Verifier of the session to keep.
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*/
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protected function destroy_other_sessions( $verifier ) {
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$session = $this->get_session( $verifier );
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$this->update_sessions( array( $verifier => $session ) );
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}
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/**
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* Destroy all session tokens for a user.
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*
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* @since 4.0.0
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* @access protected
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*/
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protected function destroy_all_sessions() {
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$this->update_sessions( array() );
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}
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/**
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* Destroy all session tokens for all users.
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*
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* @since 4.0.0
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* @access public
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* @static
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*/
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public static function drop_sessions() {
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delete_metadata( 'user', false, 'session_tokens', false, true );
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}
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}
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