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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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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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($custom_cache_header && isset($_SERVER[$custom_cache_header])); |
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} |
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|
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public static function purge_varnish_cache($url) { |
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|
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// Parse the URL to extract the host for the Host header |
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$parse_url = parse_url($url); |
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$host = $parse_url['host']; |
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|
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$headers = [ |
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"Host: $host" |
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]; |
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|
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// Purge varnish cache for whole website |
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if (strpos($url, '.*') !== false) { |
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$headers['X-Ban-Url'] = '.*'; |
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$url = home_url(); |
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} |
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|
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$ch = curl_init(); |
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curl_setopt($ch, CURLOPT_URL, $url); |
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curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'BAN'); |
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); |
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curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); |
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|
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$response = curl_exec($ch); |
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$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE); |
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curl_close($ch); |
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|
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return $httpCode === 200; |
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} |
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|
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public static function purge_cache($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 = $parsed_url['host']; |
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|
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wp_remote_request($url, 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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} |
