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<?php
/**
* The avatar cache class.
*
* Caches remote (e.g., Gravatar) avatars locally and rewrites URLs
* to serve cached copies with a TTL. Supports on-demand generation
* during page render and batch generation via cron.
*
* @since 3.0
* @package LiteSpeed
*/
namespace LiteSpeed;
defined( 'WPINC' ) || exit();
/**
* Class Avatar
*/
class Avatar extends Base {
const TYPE_GENERATE = 'generate';
/**
* Avatar cache TTL (seconds).
*
* @var int
*/
private $_conf_cache_ttl;
/**
* Avatar DB table name.
*
* @var string
*/
private $_tb;
/**
* In-request map from original URL => rewritten URL to avoid duplicates.
*
* @var array<string,string>
*/
private $_avatar_realtime_gen_dict = array();
/**
* Summary/status data for last requests.
*
* @var array<string,mixed>
*/
protected $_summary;
/**
* Init.
*
* @since 1.4
*/
public function __construct() {
if ( ! $this->conf( self::O_DISCUSS_AVATAR_CACHE ) ) {
return;
}
self::debug2( '[Avatar] init' );
$this->_tb = $this->cls( 'Data' )->tb( 'avatar' );
$this->_conf_cache_ttl = $this->conf( self::O_DISCUSS_AVATAR_CACHE_TTL );
add_filter( 'get_avatar_url', array( $this, 'crawl_avatar' ) );
$this->_summary = self::get_summary();
}
/**
* Check whether DB table is needed.
*
* @since 3.0
* @access public
* @return bool
*/
public function need_db() {
return (bool) $this->conf( self::O_DISCUSS_AVATAR_CACHE );
}
/**
* Serve static avatar by md5 (used by local static route).
*
* @since 3.0
* @access public
* @param string $md5 MD5 hash of original avatar URL.
* @return void
*/
public function serve_static( $md5 ) {
global $wpdb;
self::debug( '[Avatar] is avatar request' );
if ( strlen( $md5 ) !== 32 ) {
self::debug( '[Avatar] wrong md5 ' . $md5 );
return;
}
$url = $wpdb->get_var( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
$wpdb->prepare(
'SELECT url FROM `' . $this->_tb . '` WHERE md5 = %s', // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$md5
)
);
if ( ! $url ) {
self::debug( '[Avatar] no matched url for md5 ' . $md5 );
return;
}
$url = $this->_generate( $url );
wp_safe_redirect( $url );
exit;
}
/**
* Localize/replace avatar URL with cached one (filter callback).
*
* @since 3.0
* @access public
* @param string $url Original avatar URL.
* @return string Rewritten/cached avatar URL (or original).
*/
public function crawl_avatar( $url ) {
if ( ! $url ) {
return $url;
}
// Check if already generated in this request.
if ( ! empty( $this->_avatar_realtime_gen_dict[ $url ] ) ) {
self::debug2( '[Avatar] already in dict [url] ' . $url );
return $this->_avatar_realtime_gen_dict[ $url ];
}
$realpath = $this->_realpath( $url );
$mtime = file_exists( $realpath ) ? filemtime( $realpath ) : false;
if ( $mtime && time() - $mtime <= $this->_conf_cache_ttl ) {
self::debug2( '[Avatar] cache file exists [url] ' . $url );
return $this->_rewrite( $url, $mtime );
}
// Only handle gravatar or known remote avatar providers; keep generic check for "gravatar.com".
if ( strpos( $url, 'gravatar.com' ) === false ) {
return $url;
}
// Throttle generation.
if ( ! empty( $this->_summary['curr_request'] ) && time() - $this->_summary['curr_request'] < 300 ) {
self::debug2( '[Avatar] Bypass generating due to interval limit [url] ' . $url );
return $url;
}
// Generate immediately and track for this request.
$this->_avatar_realtime_gen_dict[ $url ] = $this->_generate( $url );
return $this->_avatar_realtime_gen_dict[ $url ];
}
/**
* Count queued avatars (expired ones) for cron.
*
* @since 3.0
* @access public
* @return int|false
*/
public function queue_count() {
global $wpdb;
// If var not exists, means table not exists // todo: not true.
if ( ! $this->_tb ) {
return false;
}
$cnt = $wpdb->get_var( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
$wpdb->prepare(
'SELECT COUNT(*) FROM `' . $this->_tb . '` WHERE dateline < %d', // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
time() - $this->_conf_cache_ttl
)
);
return (int) $cnt;
}
/**
* Build final local URL for cached avatar.
*
* @since 3.0
* @param string $url Original URL.
* @param int|null $time Optional filemtime for cache busting.
* @return string Local URL.
*/
private function _rewrite( $url, $time = null ) {
$qs = $time ? '?ver=' . $time : '';
return LITESPEED_STATIC_URL . '/avatar/' . $this->_filepath( $url ) . $qs;
}
/**
* Generate filesystem realpath for cache file.
*
* @since 3.0
* @access private
* @param string $url Original URL.
* @return string Absolute filesystem path.
*/
private function _realpath( $url ) {
return LITESPEED_STATIC_DIR . '/avatar/' . $this->_filepath( $url );
}
/**
* Get relative filepath for cached avatar.
*
* @since 4.0
* @param string $url Original URL.
* @return string Relative path under avatar/ (may include blog id).
*/
private function _filepath( $url ) {
$filename = md5( $url ) . '.jpg';
if ( is_multisite() ) {
$filename = get_current_blog_id() . '/' . $filename;
}
return $filename;
}
/**
* Cron generation for expired avatars.
*
* @since 3.0
* @access public
* @param bool $force Bypass throttle.
* @return void
*/
public static function cron( $force = false ) {
global $wpdb;
$_instance = self::cls();
if ( ! $_instance->queue_count() ) {
self::debug( '[Avatar] no queue' );
return;
}
// For cron, need to check request interval too.
if ( ! $force ) {
if ( ! empty( $_instance->_summary['curr_request'] ) && time() - $_instance->_summary['curr_request'] < 300 ) {
self::debug( '[Avatar] curr_request too close' );
return;
}
}
$list = $wpdb->get_results( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
$wpdb->prepare(
'SELECT url FROM `' . $_instance->_tb . '` WHERE dateline < %d ORDER BY id DESC LIMIT %d', // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
time() - $_instance->_conf_cache_ttl,
(int) apply_filters( 'litespeed_avatar_limit', 30 )
)
);
self::debug( '[Avatar] cron job [count] ' . ( $list ? count( $list ) : 0 ) );
if ( $list ) {
foreach ( $list as $v ) {
self::debug( '[Avatar] cron job [url] ' . $v->url );
$_instance->_generate( $v->url );
}
}
}
/**
* Download and store the avatar locally, then update DB row.
*
* @since 3.0
* @access private
* @param string $url Original avatar URL.
* @return string Rewritten local URL (fallback to original on failure).
*/
private function _generate( $url ) {
global $wpdb;
$file = $this->_realpath( $url );
// Mark request start
self::save_summary(
array(
'curr_request' => time(),
)
);
// Ensure cache directory exists
$this->_maybe_mk_cache_folder( 'avatar' );
$response = wp_safe_remote_get(
$url,
array(
'timeout' => 180,
'stream' => true,
'filename' => $file,
)
);
self::debug( '[Avatar] _generate [url] ' . $url );
// Parse response data
if ( is_wp_error( $response ) ) {
$error_message = $response->get_error_message();
if ( file_exists( $file ) ) {
wp_delete_file( $file );
}
self::debug( '[Avatar] failed to get: ' . $error_message );
return $url;
}
// Save summary data
self::save_summary(
array(
'last_spent' => time() - $this->_summary['curr_request'],
'last_request' => $this->_summary['curr_request'],
'curr_request' => 0,
)
);
// Update/insert DB record
$md5 = md5( $url );
$existed = $wpdb->query( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
$wpdb->prepare(
'UPDATE `' . $this->_tb . '` SET dateline = %d WHERE md5 = %s', // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
time(),
$md5
)
);
if ( ! $existed ) {
$wpdb->query( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
$wpdb->prepare(
'INSERT INTO `' . $this->_tb . '` (url, md5, dateline) VALUES (%s, %s, %d)', // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$url,
$md5,
time()
)
);
}
self::debug( '[Avatar] saved avatar ' . $file );
return $this->_rewrite( $url );
}
/**
* Handle all request actions from main cls.
*
* @since 3.0
* @access public
* @return void
*/
public function handler() {
$type = Router::verify_type();
switch ( $type ) {
case self::TYPE_GENERATE:
self::cron( true );
break;
default:
break;
}
Admin::redirect();
}
}