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<?php /** * File: CdnEngine_Base.php * * @package W3TC / namespace W3TC; /* * W3 CDN Base class / define( 'W3TC_CDN_RESULT_HALT', -1 ); define( 'W3TC_CDN_RESULT_ERROR', 0 ); define( 'W3TC_CDN_RESULT_OK', 1 ); define( 'W3TC_CDN_HEADER_NONE', 'none' ); define( 'W3TC_CDN_HEADER_UPLOADABLE', 'uploadable' ); define( 'W3TC_CDN_HEADER_MIRRORING', 'mirroring' ); /* * Class CdnEngine_Base * * phpcs:disable PSR2.Classes.PropertyDeclaration.Underscore * phpcs:disable PSR2.Methods.MethodDeclaration.Underscore * phpcs:disable WordPress.PHP.NoSilencedErrors.Discouraged * phpcs:disable WordPress.WP.AlternativeFunctions * phpcs:disable Generic.CodeAnalysis.UnusedFunctionParameter / class CdnEngine_Base { /* * Engine configuration * * @var array / protected $_config = array(); /* * Gzip extension * * @var string / protected $_gzip_extension = '.gzip'; /* * Last error * * @var string / protected $_last_error = ''; /* * Constructor method for initializing the CdnEngine_Base object with configuration settings. * * @param array $config Optional. An array of configuration options to override default values. * Defaults include 'debug', 'ssl', 'compression', and 'headers'. / public function __construct( $config = array() ) { $this->_config = array_merge( array( 'debug' => false, 'ssl' => 'auto', 'compression' => false, 'headers' => array(), ), $config ); } /* * Upload files to the CDN. * * @param array $files An array of files to upload. * @param array $results A reference to an array where results will be stored. * @param bool $force_rewrite Optional. Whether to force a rewrite. Default is false. * @param int $timeout_time Optional. The timeout time in seconds. Default is null. * * @return bool False on failure. / public function upload( $files, &$results, $force_rewrite = false, $timeout_time = null ) { $results = $this->_get_results( $files, W3TC_CDN_RESULT_HALT, 'Not implemented.' ); return false; } /* * Delete files from the CDN. * * @param array $files An array of files to delete. * @param array $results A reference to an array where results will be stored. * * @return bool False on failure. / public function delete( $files, &$results ) { $results = $this->_get_results( $files, W3TC_CDN_RESULT_HALT, 'Not implemented.' ); return false; } /* * Purge files from the CDN. * * @param array $files An array of files to purge. * @param array $results A reference to an array where results will be stored. * * @return bool False on failure. / public function purge( $files, &$results ) { return $this->upload( $files, $results, true ); } /* * Purge all files from the CDN. * * @param array $results A reference to an array where results will be stored. * * @return bool False on failure. / public function purge_all( &$results ) { $results = $this->_get_results( array(), W3TC_CDN_RESULT_HALT, 'Not implemented.' ); return false; } /* * Test the connection to the CDN. * * @param string $error A reference to a variable where any error message will be stored. * * @return bool True if the test is successful, false otherwise. / public function test( &$error ) { if ( ! $this->_test_domains( $error ) ) { return false; } return true; } /* * Create a container on the CDN. * * @throws \Exception If the method is not implemented. / public function create_container() { throw new \Exception( \esc_html__( 'Not implemented.', 'w3-total-cache' ) ); } /* * Get the appropriate domain for a given path. * * @param string $path Optional. The path to check. Default is an empty string. * * @return string\|false The selected domain or false if no domain is found. / public function get_domain( $path = '' ) { $domains = $this->get_domains(); $count = count( $domains ); if ( $count ) { switch ( true ) { /* * Reserved CSS / case ( isset( $domains[0] ) && $this->_is_css( $path ) ): $domain = $domains[0]; break; /* * Reserved JS after body / case ( isset( $domains[2] ) && $this->_is_js_body( $path ) ): $domain = $domains[2]; break; /* * Reserved JS before /body / case ( isset( $domains[3] ) && $this->_is_js_footer( $path ) ): $domain = $domains[3]; break; /* * Reserved JS in head, moved here due to greedy regex / case ( isset( $domains[1] ) && $this->_is_js( $path ) ): $domain = $domains[1]; break; default: if ( ! isset( $domains[0] ) ) { $scheme = $this->_get_scheme(); if ( 'https' === $scheme && ! empty( $domains['https_default'] ) ) { return $domains['https_default']; } else { return isset( $domains['http_default'] ) ? $domains['http_default'] : $domains['https_default']; } } elseif ( $count > 4 ) { $domain = $this->_get_domain( array_slice( $domains, 4 ), $path ); } else { $domain = $this->_get_domain( $domains, $path ); } } /* * Custom host for SSL / list( $domain_http, $domain_https ) = array_map( 'trim', explode( ',', $domain . ',' ) ); $scheme = $this->_get_scheme(); switch ( $scheme ) { case 'http': $domain = $domain_http; break; case 'https': $domain = ( $domain_https ? $domain_https : $domain_http ); break; } return $domain; } return false; } /* * Get all available domains. * * @return array An array of domains. / public function get_domains() { return array(); } /* * Get the domain used for accessing the CDN. * * @return string The domain URL. / public function get_via() { $domain = $this->get_domain(); if ( $domain ) { return $domain; } return 'N/A'; } /* * Format a URL for the given path. * * @param string $path The path to format. * * @return string\|false The formatted URL or false on failure. / public function format_url( $path ) { $url = $this->_format_url( $path ); if ( $url && $this->_config['compression'] && ( isset( $_SERVER['HTTP_ACCEPT_ENCODING'] ) ? stristr( sanitize_text_field( wp_unslash( $_SERVER['HTTP_ACCEPT_ENCODING'] ) ), 'gzip' ) !== false : false ) && $this->_may_gzip( $path ) ) { $qpos = strpos( $url, '?' ); if ( false !== $qpos ) { $url = substr_replace( $url, $this->_gzip_extension, $qpos, 0 ); } else { $url .= $this->_gzip_extension; } } return $url; } /* * Get the URL to prepend to a given path. * * @param string $path The path to prepend the URL to. * * @return string\|false The full URL or false if no domain is found. / public function get_prepend_path( $path ) { $domain = $this->get_domain( $path ); if ( $domain ) { $scheme = $this->_get_scheme(); $url = sprintf( '%s://%s', $scheme, $domain ); return $url; } return false; } /* * Format a URL for the given path, with the appropriate scheme and domain. * * @param string $path The path to format. * * @return string\|false The formatted URL or false if no domain is found. / public function _format_url( $path ) { $domain = $this->get_domain( $path ); if ( $domain ) { $scheme = $this->_get_scheme(); $url = sprintf( '%s://%s/%s', $scheme, $domain, $path ); return $url; } return false; } /* * Get results for a set of files. * * @param array $files The files for which results are generated. * @param string $result Optional. The result status. Default is W3TC_CDN_RESULT_OK. * @param string $error Optional. The error message. Default is 'OK'. * * @return array An array of results for each file. / public function _get_results( $files, $result = W3TC_CDN_RESULT_OK, $error = 'OK' ) { $results = array(); foreach ( $files as $key => $file ) { if ( is_array( $file ) ) { $local_path = $file['local_path']; $remote_path = $file['remote_path']; } else { $local_path = $key; $remote_path = $file; } $results[] = $this->_get_result( $local_path, $remote_path, $result, $error, $file ); } return $results; } /* * Retrieves the result data for a local and remote file path. * * @param string $local_path The local file path. * @param string $remote_path The remote file path. * @param int $result The result status (default is W3TC_CDN_RESULT_OK). * @param string $error The error message (default is 'OK'). * @param mixed\|null $descriptor Additional descriptor (default is null). * * @return array The result array containing local path, remote path, result, error, and descriptor. / public function _get_result( $local_path, $remote_path, $result = W3TC_CDN_RESULT_OK, $error = 'OK', $descriptor = null ) { if ( $this->_config['debug'] ) { $this->_log( $local_path, $remote_path, $error ); } return array( 'local_path' => $local_path, 'remote_path' => $remote_path, 'result' => $result, 'error' => $error, 'descriptor' => $descriptor, ); } /* * Checks if any of the results contain an error. * * @param array $results The results to check. * * @return bool True if any result is an error, otherwise false. / public function _is_error( $results ) { foreach ( $results as $result ) { if ( W3TC_CDN_RESULT_OK !== $result['result'] ) { return true; } } return false; } /* * Retrieves the HTTP headers for a given file. * * @param array $file The file data array containing local path and original URL. * @param array $whitelist Optional whitelist for specific headers (default is empty). * * @return array The HTTP headers for the file. / public function get_headers_for_file( $file, $whitelist = array() ) { $local_path = $file['local_path']; $mime_type = Util_Mime::get_mime_type( $local_path ); $link = $file['original_url']; $headers = array( 'Content-Type' => $mime_type, 'Last-Modified' => Util_Content::http_date( time() ), 'Access-Control-Allow-Origin' => '', 'Link' => '<' . $link . '>; rel="canonical"', ); $section = Util_Mime::mime_type_to_section( $mime_type ); if ( isset( $this->_config['headers'][ $section ] ) ) { $hc = $this->_config['headers'][ $section ]; if ( isset( $whitelist['ETag'] ) && $hc['etag'] ) { $headers['ETag'] = '"' . @md5_file( $local_path ) . '"'; } if ( $hc['expires'] ) { $headers['Expires'] = Util_Content::http_date( time() + $hc['lifetime'] ); $expires_set = true; } $headers = array_merge( $headers, $hc['static'] ); } return $headers; } /** * Determines whether a file may be compressed using Gzip. * * @param string $file The file path. * * @return bool True if the file may be gzipped, otherwise false. / public function _may_gzip( $file ) { /* * Remove query string / $file = preg_replace( '~\?.$~', '', $file ); /** * Check by file extension / if ( preg_match( '~\.(ico\|js\|css\|xml\|xsd\|xsl\|svg\|htm\|html\|txt)$~i', $file ) ) { return true; } return false; } /* * Tests the configured domains for valid hostnames. * * @param string $error A reference to store the error message if any domain is invalid. * * @return bool True if all domains are valid, otherwise false. / public function _test_domains( &$error ) { $domains = $this->get_domains(); if ( ! count( $domains ) ) { $error = 'Empty hostname / CNAME list.'; return false; } foreach ( $domains as $domain ) { $_domains = array_map( 'trim', explode( ',', $domain ) ); foreach ( $_domains as $_domain ) { $matches = null; if ( preg_match( '~^([a-z0-9\-\.])~i', $_domain, $matches ) ) { $hostname = $matches[1]; } else { $hostname = $_domain; } if ( empty( $hostname ) ) { continue; } if ( gethostbyname( $hostname ) === $hostname ) { $error = sprintf( 'Unable to resolve hostname: %s.', $hostname ); return false; } } } return true; } /** * Checks if a file is a CSS file. * * @param string $path The file path. * * @return bool True if the file is a CSS file, otherwise false. / public function _is_css( $path ) { return preg_match( '~[a-zA-Z0-9\-_](\.include\.[0-9]+)?\.css$~', $path ); } /** * Checks if a file is a JavaScript file. * * @param string $path The file path. * * @return bool True if the file is a JavaScript file, otherwise false. / public function _is_js( $path ) { return preg_match( '~([a-z0-9\-_]+(\.include\.[a-z0-9]+)\.js)$~', $path ) \|\| preg_match( '~[\w\d\-_]+\.js~', $path ); } /* * Checks if a file is a JavaScript file that should be included in the body. * * @param string $path The file path. * * @return bool True if the file is a JavaScript file for the body, otherwise false. / public function _is_js_body( $path ) { return preg_match( '~[a-z0-9\-_]+(\.include-body\.[a-z0-9]+)\.js$~', $path ); } /* * Checks if a file is a JavaScript file that should be included in the footer. * * @param string $path The file path. * * @return bool True if the file is a JavaScript file for the footer, otherwise false. / public function _is_js_footer( $path ) { return preg_match( '~[a-z0-9\-_]+(\.include-footer\.[a-z0-9]+)\.js$~', $path ); } /* * Retrieves the domain for a specific file path from a list of domains. * * @param array $domains The list of domains. * @param string $path The file path. * * @return string\|false The selected domain or false if no domain is found. / public function _get_domain( $domains, $path ) { $count = count( $domains ); if ( isset( $domains['http_default'] ) ) { --$count; } if ( isset( $domains['https_default'] ) ) { --$count; } if ( $count ) { /* * Use for equal URLs same host to allow caching by browser / $hash = $this->_get_hash( $path ); $domain = $domains[ $hash % $count ]; return $domain; } return false; } /* * Generates a hash from a given key. * * @param string $key The key to hash. * * @return int The generated hash value. / public function _get_hash( $key ) { $hash = abs( crc32( $key ) ); return $hash; } /* * Retrieves the scheme (HTTP or HTTPS) based on the configuration. * * @return string The scheme ('http' or 'https'). / public function _get_scheme() { switch ( $this->_config['ssl'] ) { default: case 'auto': $scheme = ( Util_Environment::is_https() ? 'https' : 'http' ); break; case 'enabled': $scheme = 'https'; break; case 'disabled': $scheme = 'http'; break; case 'rejected': $scheme = 'http'; break; } return $scheme; } /* * Logs a message with local and remote file paths and an error. * * @param string $local_path The local file path. * @param string $remote_path The remote file path. * @param string $error The error message. * * @return int\|false The number of bytes written to the log file, or false on failure. / public function _log( $local_path, $remote_path, $error ) { $data = sprintf( "[%s] [%s => %s] %s\n", gmdate( 'r' ), $local_path, $remote_path, $error ); $data = strtr( $data, '<>', '..' ); $filename = Util_Debug::log_filename( 'cdn' ); return @file_put_contents( $filename, $data, FILE_APPEND ); } /* * Handles errors by saving the error message. * * @param int $errno The error number. * @param string $errstr The error message. * * @return bool Always returns false. / public function _error_handler( $errno, $errstr ) { $this->_last_error = $errstr; return false; } /* * Retrieves the last error message. * * @return string The last error message. / public function _get_last_error() { return $this->_last_error; } /* * Sets a custom error handler. * * phpcs:disable WordPress.PHP.DevelopmentFunctions.error_log_set_error_handler * * @return void / public function _set_error_handler() { set_error_handler( array( $this, '_error_handler', ) ); } /* * Restores the default error handler. * * @return void / public function _restore_error_handler() { restore_error_handler(); } /* * Retrieves the header support status. * * @return string The header support status (W3TC_CDN_HEADER_NONE). */ public function headers_support() { return W3TC_CDN_HEADER_NONE; } }