JezK

Edit File: avatar.cls.php

<?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 = [];

/**
	 * Init.
	 *
	 * @since 1.4
	 */
	public function __construct() {
		$this->_tb = Data::cls()->tb( 'avatar' );

if ( ! $this->conf( self::O_DISCUSS_AVATAR_CACHE ) ) {
			return;
		}

self::debug2( '[Avatar] init' );

$this->_conf_cache_ttl = $this->conf( self::O_DISCUSS_AVATAR_CACHE_TTL );

add_filter( 'get_avatar_url', [ $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' );

// No generation for any request when avatar cache is off — fall through to the regular WP 404, same as the no-matched-record path below.
		if ( ! $this->conf( self::O_DISCUSS_AVATAR_CACHE ) ) {
			self::debug( '[Avatar] bypassed serving as avatar cache is off' );
			return;
		}

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;
		}

$generated_url = $this->_generate( $url );
		if ( $generated_url === $url ) {
			self::debug( '[Avatar] generation failed; bypassing redirect' );
			return;
		}

wp_safe_redirect( $generated_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() - (int) $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() - (int) $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;

// Avatar cache option is the module-level switch: no queue and no table creation side effect when off.
		if ( ! $this->conf( self::O_DISCUSS_AVATAR_CACHE ) ) {
			return 0;
		}

if ( ! Data::cls()->tb_exist( 'avatar' ) ) {
			Data::cls()->tb_create( 'avatar' );
		}

$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->conf( self::O_DISCUSS_AVATAR_CACHE ) ) {
			self::debug( '[Avatar] bypassed cron as avatar cache is off' );
			return;
		}

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() - (int) $_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(
			[
				'curr_request' => time(),
			]
		);

$temp = File::download( $url, $file, 180 );
		self::debug( '[Avatar] _generate [url] ' . $url );
		if ( is_wp_error( $temp ) ) {
			self::debug( '[Avatar] failed to get: ' . $temp->get_error_code() );
			return $url;
		}
		// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
		if ( false === @getimagesize( $temp ) || ! File::publish_temp_file( $temp, $file ) ) {
			wp_delete_file( $temp );
			self::debug( '[Avatar] failed to validate or save the image.' );
			return $url;
		}

// Save summary data
		self::save_summary(
			[
				'last_spent'   => time() - (int) $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();
	}
}

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