balmet.com

class-wp-session-tokens.php (7425B)

---

 <?php
 /**
  * Session API: WP_Session_Tokens class
  *
  * @package WordPress
  * @subpackage Session
  * @since 4.7.0
  */
 
 /**
  * Abstract class for managing user session tokens.
  *
  * @since 4.0.0
  */
 abstract class WP_Session_Tokens {
 
 	/**
 	 * User ID.
 	 *
 	 * @since 4.0.0
 	 * @var int User ID.
 	 */
 	protected $user_id;
 
 	/**
 	 * Protected constructor. Use the `get_instance()` method to get the instance.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param int $user_id User whose session to manage.
 	 */
 	protected function __construct( $user_id ) {
 		$this->user_id = $user_id;
 	}
 
 	/**
 	 * Retrieves a session manager instance for a user.
 	 *
 	 * This method contains a {@see 'session_token_manager'} filter, allowing a plugin to swap out
 	 * the session manager for a subclass of `WP_Session_Tokens`.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param int $user_id User whose session to manage.
 	 * @return WP_Session_Tokens The session object, which is by default an instance of
 	 *                           the `WP_User_Meta_Session_Tokens` class.
 	 */
 	final public static function get_instance( $user_id ) {
 		/**
 		 * Filters the class name for the session token manager.
 		 *
 		 * @since 4.0.0
 		 *
 		 * @param string $session Name of class to use as the manager.
 		 *                        Default 'WP_User_Meta_Session_Tokens'.
 		 */
 		$manager = apply_filters( 'session_token_manager', 'WP_User_Meta_Session_Tokens' );
 		return new $manager( $user_id );
 	}
 
 	/**
 	 * Hashes the given session token for storage.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param string $token Session token to hash.
 	 * @return string A hash of the session token (a verifier).
 	 */
 	private function hash_token( $token ) {
 		// If ext/hash is not present, use sha1() instead.
 		if ( function_exists( 'hash' ) ) {
 			return hash( 'sha256', $token );
 		} else {
 			return sha1( $token );
 		}
 	}
 
 	/**
 	 * Retrieves a user's session for the given token.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param string $token Session token.
 	 * @return array|null The session, or null if it does not exist.
 	 */
 	final public function get( $token ) {
 		$verifier = $this->hash_token( $token );
 		return $this->get_session( $verifier );
 	}
 
 	/**
 	 * Validates the given session token for authenticity and validity.
 	 *
 	 * Checks that the given token is present and hasn't expired.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param string $token Token to verify.
 	 * @return bool Whether the token is valid for the user.
 	 */
 	final public function verify( $token ) {
 		$verifier = $this->hash_token( $token );
 		return (bool) $this->get_session( $verifier );
 	}
 
 	/**
 	 * Generates a session token and attaches session information to it.
 	 *
 	 * A session token is a long, random string. It is used in a cookie
 	 * to link that cookie to an expiration time and to ensure the cookie
 	 * becomes invalidated when the user logs out.
 	 *
 	 * This function generates a token and stores it with the associated
 	 * expiration time (and potentially other session information via the
 	 * {@see 'attach_session_information'} filter).
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param int $expiration Session expiration timestamp.
 	 * @return string Session token.
 	 */
 	final public function create( $expiration ) {
 		/**
 		 * Filters the information attached to the newly created session.
 		 *
 		 * Can be used to attach further information to a session.
 		 *
 		 * @since 4.0.0
 		 *
 		 * @param array $session Array of extra data.
 		 * @param int   $user_id User ID.
 		 */
 		$session               = apply_filters( 'attach_session_information', array(), $this->user_id );
 		$session['expiration'] = $expiration;
 
 		// IP address.
 		if ( ! empty( $_SERVER['REMOTE_ADDR'] ) ) {
 			$session['ip'] = $_SERVER['REMOTE_ADDR'];
 		}
 
 		// User-agent.
 		if ( ! empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
 			$session['ua'] = wp_unslash( $_SERVER['HTTP_USER_AGENT'] );
 		}
 
 		// Timestamp.
 		$session['login'] = time();
 
 		$token = wp_generate_password( 43, false, false );
 
 		$this->update( $token, $session );
 
 		return $token;
 	}
 
 	/**
 	 * Updates the data for the session with the given token.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param string $token Session token to update.
 	 * @param array  $session Session information.
 	 */
 	final public function update( $token, $session ) {
 		$verifier = $this->hash_token( $token );
 		$this->update_session( $verifier, $session );
 	}
 
 	/**
 	 * Destroys the session with the given token.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param string $token Session token to destroy.
 	 */
 	final public function destroy( $token ) {
 		$verifier = $this->hash_token( $token );
 		$this->update_session( $verifier, null );
 	}
 
 	/**
 	 * Destroys all sessions for this user except the one with the given token (presumably the one in use).
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param string $token_to_keep Session token to keep.
 	 */
 	final public function destroy_others( $token_to_keep ) {
 		$verifier = $this->hash_token( $token_to_keep );
 		$session  = $this->get_session( $verifier );
 		if ( $session ) {
 			$this->destroy_other_sessions( $verifier );
 		} else {
 			$this->destroy_all_sessions();
 		}
 	}
 
 	/**
 	 * Determines whether a session is still valid, based on its expiration timestamp.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param array $session Session to check.
 	 * @return bool Whether session is valid.
 	 */
 	final protected function is_still_valid( $session ) {
 		return $session['expiration'] >= time();
 	}
 
 	/**
 	 * Destroys all sessions for a user.
 	 *
 	 * @since 4.0.0
 	 */
 	final public function destroy_all() {
 		$this->destroy_all_sessions();
 	}
 
 	/**
 	 * Destroys all sessions for all users.
 	 *
 	 * @since 4.0.0
 	 */
 	final public static function destroy_all_for_all_users() {
 		/** This filter is documented in wp-includes/class-wp-session-tokens.php */
 		$manager = apply_filters( 'session_token_manager', 'WP_User_Meta_Session_Tokens' );
 		call_user_func( array( $manager, 'drop_sessions' ) );
 	}
 
 	/**
 	 * Retrieves all sessions for a user.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @return array Sessions for a user.
 	 */
 	final public function get_all() {
 		return array_values( $this->get_sessions() );
 	}
 
 	/**
 	 * Retrieves all sessions of the user.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @return array Sessions of the user.
 	 */
 	abstract protected function get_sessions();
 
 	/**
 	 * Retrieves a session based on its verifier (token hash).
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param string $verifier Verifier for the session to retrieve.
 	 * @return array|null The session, or null if it does not exist.
 	 */
 	abstract protected function get_session( $verifier );
 
 	/**
 	 * Updates a session based on its verifier (token hash).
 	 *
 	 * Omitting the second argument destroys the session.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param string $verifier Verifier for the session to update.
 	 * @param array  $session  Optional. Session. Omitting this argument destroys the session.
 	 */
 	abstract protected function update_session( $verifier, $session = null );
 
 	/**
 	 * Destroys all sessions for this user, except the single session with the given verifier.
 	 *
 	 * @since 4.0.0
 	 *
 	 * @param string $verifier Verifier of the session to keep.
 	 */
 	abstract protected function destroy_other_sessions( $verifier );
 
 	/**
 	 * Destroys all sessions for the user.
 	 *
 	 * @since 4.0.0
 	 */
 	abstract protected function destroy_all_sessions();
 
 	/**
 	 * Destroys all sessions for all users.
 	 *
 	 * @since 4.0.0
 	 */
 	public static function drop_sessions() {}
 }