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300 lines
7.2 KiB
300 lines
7.2 KiB
<?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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