320 lines
9.0 KiB
PHP
320 lines
9.0 KiB
PHP
<?php
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/**
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* WPSEO plugin file.
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*
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* @package WPSEO\XML_Sitemaps
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*/
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/**
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* Handles storage keys for sitemaps caching and invalidation.
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*
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* @since 3.2
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*/
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class WPSEO_Sitemaps_Cache_Validator {
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/**
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* Prefix of the transient key for sitemap caches.
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*
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* @var string
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*/
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const STORAGE_KEY_PREFIX = 'yst_sm_';
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/**
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* Name of the option that holds the global validation value.
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*
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* @var string
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*/
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const VALIDATION_GLOBAL_KEY = 'wpseo_sitemap_cache_validator_global';
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/**
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* The format which creates the key of the option that holds the type validation value.
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*
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* @var string
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*/
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const VALIDATION_TYPE_KEY_FORMAT = 'wpseo_sitemap_%s_cache_validator';
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/**
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* Get the cache key for a certain type and page.
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*
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* A type of cache would be something like 'page', 'post' or 'video'.
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*
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* Example key format for sitemap type "post", page 1: wpseo_sitemap_post_1:akfw3e_23azBa .
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*
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* @since 3.2
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*
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* @param string|null $type The type to get the key for. Null or self::SITEMAP_INDEX_TYPE for index cache.
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* @param int $page The page of cache to get the key for.
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*
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* @return bool|string The key where the cache is stored on. False if the key could not be generated.
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*/
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public static function get_storage_key( $type = null, $page = 1 ) {
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// Using SITEMAP_INDEX_TYPE for sitemap index cache.
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$type = is_null( $type ) ? WPSEO_Sitemaps::SITEMAP_INDEX_TYPE : $type;
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$global_cache_validator = self::get_validator();
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$type_cache_validator = self::get_validator( $type );
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$prefix = self::STORAGE_KEY_PREFIX;
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$postfix = sprintf( '_%d:%s_%s', $page, $global_cache_validator, $type_cache_validator );
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try {
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$type = self::truncate_type( $type, $prefix, $postfix );
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} catch ( OutOfBoundsException $exception ) {
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// Maybe do something with the exception, for now just mark as invalid.
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return false;
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}
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// Build key.
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$full_key = $prefix . $type . $postfix;
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return $full_key;
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}
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/**
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* If the type is over length make sure we compact it so we don't have any database problems.
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*
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* When there are more 'extremely long' post types, changes are they have variations in either the start or ending.
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* Because of this, we cut out the excess in the middle which should result in less chance of collision.
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*
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* @since 3.2
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*
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* @param string $type The type of sitemap to be used.
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* @param string $prefix The part before the type in the cache key. Only the length is used.
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* @param string $postfix The part after the type in the cache key. Only the length is used.
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*
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* @return string The type with a safe length to use
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*
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* @throws OutOfRangeException When there is less than 15 characters of space for a key that is originally longer.
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*/
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public static function truncate_type( $type, $prefix = '', $postfix = '' ) {
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/*
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* This length has been restricted by the database column length of 64 in the past.
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* The prefix added by WordPress is '_transient_' because we are saving to a transient.
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* We need to use a timeout on the transient, otherwise the values get autoloaded, this adds
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* another restriction to the length.
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*/
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$max_length = 45; // 64 - 19 ('_transient_timeout_')
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$max_length -= strlen( $prefix );
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$max_length -= strlen( $postfix );
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if ( strlen( $type ) > $max_length ) {
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if ( $max_length < 15 ) {
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/*
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* If this happens the most likely cause is a page number that is too high.
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*
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* So this would not happen unintentionally.
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* Either by trying to cause a high server load, finding backdoors or misconfiguration.
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*/
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throw new OutOfRangeException(
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__(
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'Trying to build the sitemap cache key, but the postfix and prefix combination leaves too little room to do this. You are probably requesting a page that is way out of the expected range.',
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'wordpress-seo'
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)
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);
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}
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$half = ( $max_length / 2 );
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$first_part = substr( $type, 0, ( ceil( $half ) - 1 ) );
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$last_part = substr( $type, ( 1 - floor( $half ) ) );
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$type = $first_part . '..' . $last_part;
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}
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return $type;
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}
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/**
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* Invalidate sitemap cache.
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*
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* @since 3.2
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*
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* @param string|null $type The type to get the key for. Null for all caches.
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*
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* @return void
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*/
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public static function invalidate_storage( $type = null ) {
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// Global validator gets cleared when no type is provided.
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$old_validator = null;
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// Get the current type validator.
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if ( ! is_null( $type ) ) {
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$old_validator = self::get_validator( $type );
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}
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// Refresh validator.
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self::create_validator( $type );
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if ( ! wp_using_ext_object_cache() ) {
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// Clean up current cache from the database.
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self::cleanup_database( $type, $old_validator );
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}
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// External object cache pushes old and unretrieved items out by itself so we don't have to do anything for that.
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}
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/**
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* Cleanup invalidated database cache.
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*
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* @since 3.2
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*
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* @param string|null $type The type of sitemap to clear cache for.
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* @param string|null $validator The validator to clear cache of.
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*
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* @return void
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*/
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public static function cleanup_database( $type = null, $validator = null ) {
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global $wpdb;
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if ( is_null( $type ) ) {
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// Clear all cache if no type is provided.
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$like = sprintf( '%s%%', self::STORAGE_KEY_PREFIX );
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}
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else {
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// Clear type cache for all type keys.
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$like = sprintf( '%1$s%2$s_%%', self::STORAGE_KEY_PREFIX, $type );
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}
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/*
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* Add slashes to the LIKE "_" single character wildcard.
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*
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* We can't use `esc_like` here because we need the % in the query.
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*/
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$where = [];
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$where[] = sprintf( "option_name LIKE '%s'", addcslashes( '_transient_' . $like, '_' ) );
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$where[] = sprintf( "option_name LIKE '%s'", addcslashes( '_transient_timeout_' . $like, '_' ) );
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// Delete transients.
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$query = sprintf( 'DELETE FROM %1$s WHERE %2$s', $wpdb->options, implode( ' OR ', $where ) );
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$wpdb->query( $query );
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wp_cache_delete( 'alloptions', 'options' );
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}
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/**
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* Get the current cache validator.
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*
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* Without the type the global validator is returned.
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* This can invalidate -all- keys in cache at once.
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*
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* With the type parameter the validator for that specific type can be invalidated.
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*
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* @since 3.2
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*
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* @param string $type Provide a type for a specific type validator, empty for global validator.
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*
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* @return string|null The validator for the supplied type.
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*/
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public static function get_validator( $type = '' ) {
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$key = self::get_validator_key( $type );
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$current = get_option( $key, null );
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if ( ! is_null( $current ) ) {
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return $current;
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}
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if ( self::create_validator( $type ) ) {
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return self::get_validator( $type );
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}
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return null;
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}
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/**
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* Get the cache validator option key for the specified type.
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*
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* @since 3.2
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*
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* @param string $type Provide a type for a specific type validator, empty for global validator.
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*
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* @return string Validator to be used to generate the cache key.
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*/
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public static function get_validator_key( $type = '' ) {
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if ( empty( $type ) ) {
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return self::VALIDATION_GLOBAL_KEY;
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}
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return sprintf( self::VALIDATION_TYPE_KEY_FORMAT, $type );
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}
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/**
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* Refresh the cache validator value.
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*
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* @since 3.2
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*
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* @param string $type Provide a type for a specific type validator, empty for global validator.
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*
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* @return bool True if validator key has been saved as option.
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*/
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public static function create_validator( $type = '' ) {
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$key = self::get_validator_key( $type );
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// Generate new validator.
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$microtime = microtime();
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// Remove space.
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list( $milliseconds, $seconds ) = explode( ' ', $microtime );
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// Transients are purged every 24h.
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$seconds = ( $seconds % DAY_IN_SECONDS );
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$milliseconds = intval( substr( $milliseconds, 2, 3 ), 10 );
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// Combine seconds and milliseconds and convert to integer.
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$validator = intval( $seconds . '' . $milliseconds, 10 );
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// Apply base 61 encoding.
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$compressed = self::convert_base10_to_base61( $validator );
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return update_option( $key, $compressed, false );
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}
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/**
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* Encode to base61 format.
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*
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* This is base64 (numeric + alpha + alpha upper case) without the 0.
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*
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* @since 3.2
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*
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* @param int $base10 The number that has to be converted to base 61.
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*
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* @return string Base 61 converted string.
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*
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* @throws InvalidArgumentException When the input is not an integer.
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*/
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public static function convert_base10_to_base61( $base10 ) {
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if ( ! is_int( $base10 ) ) {
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throw new InvalidArgumentException( __( 'Expected an integer as input.', 'wordpress-seo' ) );
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}
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// Characters that will be used in the conversion.
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$characters = '123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$length = strlen( $characters );
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$remainder = $base10;
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$output = '';
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do {
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// Building from right to left in the result.
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$index = ( $remainder % $length );
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// Prepend the character to the output.
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$output = $characters[ $index ] . $output;
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// Determine the remainder after removing the applied number.
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$remainder = floor( $remainder / $length );
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// Keep doing it until we have no remainder left.
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} while ( $remainder );
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return $output;
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}
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}
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