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<?php
/**
 * Class Cookies
 *
 * @package wpengine/common-mu-plugin
 */

namespace wpe\plugin;

/**
 * Class Cookies
 */
class Cookies {

	/**
	 * Register our class method(s) with the appropriate WordPress hooks.
	 */
	public static function register_hooks() {
		add_action( 'auth_cookie_malformed', array( __CLASS__, 'purge_browser_cookie' ) );
		add_action( 'auth_cookie_expired', array( __CLASS__, 'purge_browser_cookie' ) );
		add_action( 'auth_cookie_bad_username', array( __CLASS__, 'purge_browser_cookie' ) );
		add_action( 'auth_cookie_bad_hash', array( __CLASS__, 'purge_browser_cookie' ) );
	}

	/**
	 * Clear the authentication cookies.
	 *
	 * @param array|string $cookie The current authentication cookie.
	 */
	public static function purge_browser_cookie( $cookie ) {
		// Remove the action to prevent recursion with some plugins (notably s2member).
		remove_action( current_action(), array( __CLASS__, __FUNCTION__ ) );

		/*
		 * Sometimes the cookie is empty because WordPress uses multiple types of auth cookies.
		 * When one of the cookies is empty, we don't want to purge the cookies because other
		 * cookies may have us legitimately logged in *and* empty cookies (e.g., unset) aren't
		 * doing the cache-busting that prompts us to want to purge.
		 */
		if ( empty( $cookie ) ) {
			return;
		}

		wp_clear_auth_cookie();
	}
}