woocommerce/includes/class-wc-session-handler.php

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<?php
if ( ! defined( 'ABSPATH' ) ) {
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exit;
}
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/**
* Handle data for the current customers session.
* Implements the WC_Session abstract class.
*
* From 2.5 this uses a custom table for session storage. Based on https://github.com/kloon/woocommerce-large-sessions.
*
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* @class WC_Session_Handler
* @version 2.5.0
* @package WooCommerce/Classes
* @category Class
* @author WooThemes
*/
class WC_Session_Handler extends WC_Session {
/** @var string cookie name */
private $_cookie;
/** @var string session due to expire timestamp */
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private $_session_expiring;
/** @var string session expiration timestamp */
private $_session_expiration;
/** $var bool Bool based on whether a cookie exists **/
private $_has_cookie = false;
/** @var string Custom session table name */
private $_table;
/**
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* Constructor for the session class
*/
public function __construct() {
global $wpdb;
$this->_cookie = 'wp_woocommerce_session_' . COOKIEHASH;
$this->_table = $wpdb->prefix . 'woocommerce_sessions';
if ( $cookie = $this->get_session_cookie() ) {
$this->_customer_id = $cookie[0];
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$this->_session_expiration = $cookie[1];
$this->_session_expiring = $cookie[2];
$this->_has_cookie = true;
// Update session if its close to expiring
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if ( time() > $this->_session_expiring ) {
$this->set_session_expiration();
$this->update_session_timestamp( $this->_customer_id, $this->_session_expiration );
}
} else {
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$this->set_session_expiration();
$this->_customer_id = $this->generate_customer_id();
}
$this->_data = $this->get_session_data();
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// Actions
add_action( 'woocommerce_set_cart_cookies', array( $this, 'set_customer_session_cookie' ), 10 );
add_action( 'woocommerce_cleanup_sessions', array( $this, 'cleanup_sessions' ), 10 );
add_action( 'shutdown', array( $this, 'save_data' ), 20 );
add_action( 'wp_logout', array( $this, 'destroy_session' ) );
if ( ! is_user_logged_in() ) {
add_action( 'woocommerce_thankyou', array( $this, 'destroy_session' ) );
add_filter( 'nonce_user_logged_out', array( $this, 'nonce_user_logged_out' ) );
}
}
/**
* Sets the session cookie on-demand (usually after adding an item to the cart)
*
* Since the cookie name (as of 2.1) is prepended with wp, cache systems like batcache will not cache pages when set
*
* Warning: Cookies will only be set if this is called before the headers are sent
*/
public function set_customer_session_cookie( $set ) {
if ( $set ) {
// Set/renew our cookie
$to_hash = $this->_customer_id . $this->_session_expiration;
$cookie_hash = hash_hmac( 'md5', $to_hash, wp_hash( $to_hash ) );
$cookie_value = $this->_customer_id . '||' . $this->_session_expiration . '||' . $this->_session_expiring . '||' . $cookie_hash;
$this->_has_cookie = true;
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// Set the cookie
wc_setcookie( $this->_cookie, $cookie_value, $this->_session_expiration, apply_filters( 'wc_session_use_secure_cookie', false ) );
}
}
/**
* Return true if the current user has an active session, i.e. a cookie to retrieve values
*
* @return bool
*/
public function has_session() {
return isset( $_COOKIE[ $this->_cookie ] ) || $this->_has_cookie || is_user_logged_in();
}
/**
* Set session expiration.
*/
public function set_session_expiration() {
$this->_session_expiring = time() + intval( apply_filters( 'wc_session_expiring', 60 * 60 * 47 ) ); // 47 Hours
$this->_session_expiration = time() + intval( apply_filters( 'wc_session_expiration', 60 * 60 * 48 ) ); // 48 Hours
}
/**
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* Generate a unique customer ID for guests, or return user ID if logged in
*
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* Uses Portable PHP password hashing framework to generate a unique cryptographically strong ID
*
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* @return int|string
*/
public function generate_customer_id() {
if ( is_user_logged_in() ) {
return get_current_user_id();
} else {
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require_once( ABSPATH . 'wp-includes/class-phpass.php');
$hasher = new PasswordHash( 8, false );
return md5( $hasher->get_random_bytes( 32 ) );
}
}
/**
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* Get session cookie
*
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* @return bool|array
*/
public function get_session_cookie() {
if ( empty( $_COOKIE[ $this->_cookie ] ) ) {
return false;
}
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list( $customer_id, $session_expiration, $session_expiring, $cookie_hash ) = explode( '||', $_COOKIE[ $this->_cookie ] );
// Validate hash
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$to_hash = $customer_id . $session_expiration;
$hash = hash_hmac( 'md5', $to_hash, wp_hash( $to_hash ) );
if ( $hash != $cookie_hash ) {
return false;
}
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return array( $customer_id, $session_expiration, $session_expiring, $cookie_hash );
}
/**
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* Get session data
*
* @return array
*/
public function get_session_data() {
return $this->has_session() ? (array) $this->get_session( $this->_customer_id, array() ) : array();
}
/**
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* Gets a cache prefix. This is used in session names so the entire cache can be invalidated with 1 function call
*
* @return string
*/
private function get_cache_prefix() {
$prefix_num = wp_cache_get( 'wc_session_prefix', WC_SESSION_CACHE_GROUP );
if ( $prefix_num === false ) {
wp_cache_set( 'wc_session_prefix', 1, WC_SESSION_CACHE_GROUP );
}
return 'wc_session_' . $prefix_num . '_';
}
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/**
* Save data
*/
public function save_data() {
// Dirty if something changed - prevents saving nothing new
if ( $this->_dirty && $this->has_session() ) {
global $wpdb;
$session_id = $wpdb->get_var( $wpdb->prepare( "SELECT session_id FROM $this->_table WHERE session_key = %s;", $this->_customer_id ) );
if ( $session_id ) {
$wpdb->update(
$this->_table,
array(
'session_key' => $this->_customer_id,
'session_value' => maybe_serialize( $this->_data ),
'session_expiry' => $this->_session_expiration
),
array( 'session_id' => $session_id ),
array(
'%s',
'%s',
'%d'
),
array( '%d' )
);
} else {
$wpdb->insert(
$this->_table,
array(
'session_key' => $this->_customer_id,
'session_value' => maybe_serialize( $this->_data ),
'session_expiry' => $this->_session_expiration
),
array(
'%s',
'%s',
'%d'
)
);
}
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// Set cache
wp_cache_set( $this->get_cache_prefix() . $this->_customer_id, $this->_data, WC_SESSION_CACHE_GROUP, $this->_session_expiration - time() );
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// Mark session clean after saving
$this->_dirty = false;
}
}
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/**
* Destroy all session data
*/
public function destroy_session() {
// Clear cookie
wc_setcookie( $this->_cookie, '', time() - YEAR_IN_SECONDS, apply_filters( 'wc_session_use_secure_cookie', false ) );
$this->delete_session( $this->_customer_id );
// Clear cart
wc_empty_cart();
// Clear data
$this->_data = array();
$this->_dirty = false;
$this->_customer_id = $this->generate_customer_id();
}
/**
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* When a user is logged out, ensure they have a unique nonce by using the customer/session ID
*
* @return string
*/
public function nonce_user_logged_out( $uid ) {
return $this->has_session() && $this->_customer_id ? $this->_customer_id : $uid;
}
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/**
* Cleanup sessions
*/
public function cleanup_sessions() {
global $wpdb;
if ( ! defined( 'WP_SETUP_CONFIG' ) && ! defined( 'WP_INSTALLING' ) ) {
// Delete expired sessions
$wpdb->query( $wpdb->prepare( "DELETE FROM $this->_table WHERE session_expiry < %d", time() ) );
// Invalidate cache
wp_cache_incr( 'wc_session_prefix', 1, WC_SESSION_CACHE_GROUP );
}
}
/**
* Returns the session
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*
* @param string $customer_id
* @param mixed $default
* @return string|array
*/
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public function get_session( $customer_id, $default = false ) {
global $wpdb;
if ( defined( 'WP_SETUP_CONFIG' ) ) {
return false;
}
// Try get it from the cache, it will return false if not present or if object cache not in use
$value = wp_cache_get( $this->get_cache_prefix() . $customer_id, WC_SESSION_CACHE_GROUP );
if ( false === $value ) {
$value = $wpdb->get_var( $wpdb->prepare( "SELECT session_value FROM $this->_table WHERE session_key = %s", $customer_id ) );
if ( is_null( $value ) ) {
$value = $default;
}
wp_cache_add( $this->get_cache_prefix() . $customer_id, $value, WC_SESSION_CACHE_GROUP, $this->_session_expiration - time() );
}
return maybe_unserialize( $value );
}
/**
* Delete the session from the cache and database
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*
* @param int $customer_id
*/
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public function delete_session( $customer_id ) {
global $wpdb;
wp_cache_delete( $this->get_cache_prefix() . $customer_id, WC_SESSION_CACHE_GROUP );
$wpdb->delete(
$this->_table,
array(
'session_key' => $customer_id
)
);
}
/**
* Update the session expiry timestamp
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*
* @param string $customer_id
* @param int $timestamp
*/
public function update_session_timestamp( $customer_id, $timestamp ) {
global $wpdb;
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$wpdb->update(
$this->_table,
array(
'session_expiry' => $timestamp
),
array(
'session_key' => $customer_id
),
array(
'%d'
)
);
}
}