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Prior to about 2013, many class methods lacked even access modifiers which made the `@access` notations that much more useful. Now that we've gotten to a point where the codebase is more mature from a maintenance perspective and we can finally remove these notations. Notable exceptions to this change include standalone functions notated as private as well as some classes still considered to represent "private" APIs. See #41452. Built from https://develop.svn.wordpress.org/trunk@41162 git-svn-id: http://core.svn.wordpress.org/trunk@41002 1a063a9b-81f0-0310-95a4-ce76da25c4cd
301 lines
7.2 KiB
PHP
301 lines
7.2 KiB
PHP
<?php
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/**
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* Session API: WP_Session_Tokens class
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*
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* @package WordPress
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* @subpackage Session
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* @since 4.7.0
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*/
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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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* @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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* Retrieves a session token manager instance for a user.
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*
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* This method contains a {@see 'session_token_manager'} filter, allowing 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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* @static
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*
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* @param int $user_id User whose session to manage.
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* @return WP_User_Meta_Session_Tokens WP_User_Meta_Session_Tokens class instance by default.
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*/
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final public static function get_instance( $user_id ) {
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/**
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* Filters 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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*
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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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*
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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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*
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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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* {@see 'attach_session_information'} filter).
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*
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* @since 4.0.0
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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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* Filters 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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// IP address.
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if ( !empty( $_SERVER['REMOTE_ADDR'] ) ) {
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$session['ip'] = $_SERVER['REMOTE_ADDR'];
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}
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// User-agent.
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if ( ! empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
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$session['ua'] = wp_unslash( $_SERVER['HTTP_USER_AGENT'] );
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}
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// Timestamp
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$session['login'] = time();
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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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*
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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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*
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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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*
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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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*
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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 $session['expiration'] >= time();
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}
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/**
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* Destroy all session tokens for a user.
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*
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* @since 4.0.0
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*/
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final public function destroy_all() {
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$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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* @static
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*/
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final public static function destroy_all_for_all_users() {
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/** This filter is documented in wp-includes/class-wp-session-tokens.php */
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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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*
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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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*
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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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*
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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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*
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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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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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*
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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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*/
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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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* @static
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*/
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public static function drop_sessions() {}
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}
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