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<?php |
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|
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class berqReverseProxyCache |
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{ |
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public static function bypass() |
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{ |
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add_action('send_headers', [self::class, 'handle_bypass']); |
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} |
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|
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public static function handle_bypass() |
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{ |
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if (headers_sent()) { |
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return; |
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} |
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|
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header('Cache-Control: no-cache, no-store, must-revalidate'); |
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header('Pragma: no-cache'); |
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header('Expires: 0'); |
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header('X-Bypass-Cache: ' . time()); |
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header('Vary: X-Bypass-Cache'); |
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} |
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|
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public static function is_reverse_proxy_cache_enabled() |
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{ |
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$custom_cache_header = get_option('berqwp_custom_cache_header'); |
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return isset($_SERVER['HTTP_X_CACHE']) || |
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isset($_SERVER['HTTP_X_VARNISH']) || |
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isset($_SERVER['HTTP_CF_CACHE_STATUS']) || |
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isset($_SERVER['HTTP_X_CACHE_STATUS']) || |
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isset($_SERVER['HTTP_X_FASTCGI_CACHE']) || |
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isset($_SERVER['HTTP_X_HCDN_CACHE_STATUS']) || |
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isset($_SERVER['HTTP_X_CDN_CACHE_STATUS']) || |
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isset($_SERVER['HTTP_X_PROXY_CACHE']) || |
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($custom_cache_header && isset($_SERVER[$custom_cache_header])); |
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} |
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|
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public static function purge_varnish_cache($urls, $server_list = [], $purge_method = 'PURGE', $headers = []) |
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{ |
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|
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if (!is_array($urls)) { |
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$urls = [$urls]; |
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} |
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|
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foreach ((array) $urls as $url) { |
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$parsed = parse_url($url); |
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if (!$parsed) |
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continue; |
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|
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// Build base URL components |
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$scheme = $parsed['scheme'] ?? 'http'; |
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$host = $parsed['host'] ?? ''; |
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$path = $parsed['path'] ?? '/'; |
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$query = $parsed['query'] ?? ''; |
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|
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$targets = empty($server_list) ? [['host' => $host, 'url' => $url]] : []; |
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|
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// Create server targets if server list exists |
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if (!empty($server_list)) { |
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foreach ($server_list as $server) { |
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$targets[] = [ |
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'host' => $host, |
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'url' => "$scheme://$server$path" . ($query ? "?$query" : "") |
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]; |
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} |
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} |
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|
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// Send purge requests |
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foreach ($targets as $target) { |
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$res = wp_remote_request($target['url'], [ |
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'method' => $purge_method, |
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'headers' => array_merge( |
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['Host' => $target['host']], |
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$headers |
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), |
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// 'blocking' => false // Non-blocking for performance |
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]); |
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// var_dump($res); |
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} |
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} |
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} |
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|
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public static function flush_all() |
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{ |
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if (!self::is_reverse_proxy_cache_enabled()) { |
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return false; |
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} |
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|
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$results = []; |
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|
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// Attempt full site purge using home URL with wildcard |
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$home_url = home_url('/*'); |
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|
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$results['ban'] = self::purge_varnish_cache(home_url('/.*')); |
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|
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// Second method: Generic PURGE with regex |
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$results['purge'] = wp_remote_request($home_url, [ |
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'method' => 'PURGE', |
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'headers' => [ |
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'Host' => parse_url(home_url(), PHP_URL_HOST), |
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'X-Purge-Regex' => '.*' |
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] |
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]); |
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|
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// Third method: CacheFlush-style header |
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$results['invalidate'] = wp_remote_request($home_url, [ |
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'method' => 'INVALIDATE', |
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'headers' => [ |
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'Host' => parse_url(home_url(), PHP_URL_HOST) |
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] |
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]); |
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|
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// Return true if any method succeeded |
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return in_array(true, $results, true); |
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} |
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|
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public static function purge_cache($url) |
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{ |
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if (!self::is_reverse_proxy_cache_enabled()) { |
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return false; |
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} |
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|
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$parsed_url = parse_url($url); |
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$host = $parsed_url['host']; |
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|
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wp_remote_request( |
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$url, |
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array( |
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'method' => 'PURGE', |
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'headers' => array( |
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'Host' => $host |
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) |
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) |
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); |
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|
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self::purge_varnish_cache($url); |
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|
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if (strpos($url, '/.*') !== false) { |
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$url = str_replace('/.*', '/', $url); |
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} |
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|
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// $response = wp_remote_get($url, array( |
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// 'headers' => array( |
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// 'Cookie' => 'wordpress_logged_in_', |
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// 'Cache-Control' => 'no-cache, must-revalidate, max-age=0', |
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// 'Pragma' => 'no-cache' |
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// ) |
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// )); |
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} |
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} |
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|
