650 lines
12 KiB
PHP
650 lines
12 KiB
PHP
<?php
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namespace W3TC;
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/**
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* W3 CDN Base class
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*/
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define( 'W3TC_CDN_RESULT_HALT', -1 );
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define( 'W3TC_CDN_RESULT_ERROR', 0 );
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define( 'W3TC_CDN_RESULT_OK', 1 );
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define( 'W3TC_CDN_HEADER_NONE', 'none' );
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define( 'W3TC_CDN_HEADER_UPLOADABLE', 'uploadable' );
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define( 'W3TC_CDN_HEADER_MIRRORING', 'mirroring' );
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/**
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* class CdnEngine_Base
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*/
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class CdnEngine_Base {
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/**
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* Engine configuration
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*
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* @var array
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*/
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var $_config = array();
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/**
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* gzip extension
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*
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* @var string
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*/
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var $_gzip_extension = '.gzip';
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/**
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* Last error
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*
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* @var string
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*/
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var $_last_error = '';
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/**
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* PHP5 Constructor
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*
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* @param array $config
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*/
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function __construct( $config = array() ) {
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$this->_config = array_merge( array(
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'debug' => false,
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'ssl' => 'auto',
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'compression' => false,
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'headers' => array()
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), $config );
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}
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/**
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* Upload files to CDN
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*
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* @param array $files takes array consisting of array(array('local_path'=>'', 'remote_path'=>''))
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* @param array $results
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* @param boolean $force_rewrite
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* @return boolean
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*/
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function upload( $files, &$results, $force_rewrite = false,
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$timeout_time = NULL ) {
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$results = $this->_get_results( $files, W3TC_CDN_RESULT_HALT,
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'Not implemented.' );
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return false;
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}
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/**
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* Delete files from CDN
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*
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* @param array $files
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* @param array $results
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* @return boolean
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*/
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function delete( $files, &$results ) {
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$results = $this->_get_results( $files, W3TC_CDN_RESULT_HALT,
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'Not implemented.' );
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return false;
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}
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/**
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* Purge files from CDN
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*
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* @param array $files
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* @param array $results
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* @return boolean
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*/
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function purge( $files, &$results ) {
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return $this->upload( $files, $results, true );
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}
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/**
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* Purge CDN completely
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*
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* @param unknown $results
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* @return bool
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*/
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function purge_all( &$results ) {
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$results = $this->_get_results( array(), W3TC_CDN_RESULT_HALT,
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'Not implemented.' );
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return false;
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}
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/**
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* Test CDN server
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*
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* @param string $error
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* @return boolean
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*/
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function test( &$error ) {
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if ( !$this->_test_domains( $error ) ) {
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return false;
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}
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return true;
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}
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/**
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* Create bucket / container for some CDN engines
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*/
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function create_container() {
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throw new \Exception( 'Not implemented.' );
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}
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/**
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* Returns first domain
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*
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* @param string $path
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* @return string
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*/
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function get_domain( $path = '' ) {
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$domains = $this->get_domains();
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$count = count( $domains );
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if ( $count ) {
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switch ( true ) {
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/**
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* Reserved CSS
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*/
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case ( isset( $domains[0] ) && $this->_is_css( $path ) ):
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$domain = $domains[0];
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break;
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/**
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* Reserved JS after body
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*/
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case ( isset( $domains[2] ) && $this->_is_js_body( $path ) ):
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$domain = $domains[2];
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break;
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/**
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* Reserved JS before /body
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*/
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case ( isset( $domains[3] ) && $this->_is_js_footer( $path ) ):
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$domain = $domains[3];
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break;
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/**
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* Reserved JS in head, moved here due to greedy regex
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*/
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case ( isset( $domains[1] ) && $this->_is_js( $path ) ):
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$domain = $domains[1];
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break;
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default:
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if ( !isset( $domains[0] ) ) {
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$scheme = $this->_get_scheme();
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if ( 'https' == $scheme && !empty( $domains['https_default'] ) ) {
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return $domains['https_default'];
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} else {
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return isset( $domains['http_default'] ) ? $domains['http_default'] :
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$domains['https_default'];
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}
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} elseif ( $count > 4 ) {
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$domain = $this->_get_domain( array_slice( $domains, 4 ),
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$path );
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} else {
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$domain = $this->_get_domain( $domains, $path );
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}
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}
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/**
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* Custom host for SSL
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*/
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list( $domain_http, $domain_https ) = array_map( 'trim',
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explode( ',', $domain . ',' ) );
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$scheme = $this->_get_scheme();
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switch ( $scheme ) {
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case 'http':
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$domain = $domain_http;
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break;
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case 'https':
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$domain = ( $domain_https ? $domain_https : $domain_http );
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break;
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}
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return $domain;
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}
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return false;
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}
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/**
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* Returns array of CDN domains
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*
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* @return array
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*/
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function get_domains() {
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return array();
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}
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/**
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* Returns via string
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*
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* @return string
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*/
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function get_via() {
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$domain = $this->get_domain();
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if ( $domain ) {
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return $domain;
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}
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return 'N/A';
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}
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/**
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* Formats URL
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*
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* @param string $path
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* @return string
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*/
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function format_url( $path ) {
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$url = $this->_format_url( $path );
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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 ) ) {
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if ( ( $qpos = strpos( $url, '?' ) ) !== false ) {
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$url = substr_replace( $url, $this->_gzip_extension, $qpos, 0 );
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} else {
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$url .= $this->_gzip_extension;
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}
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}
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return $url;
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}
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/**
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* Returns prepend path
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*
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* @param string $path
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* @return string
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*/
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function get_prepend_path( $path ) {
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$domain = $this->get_domain( $path );
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if ( $domain ) {
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$scheme = $this->_get_scheme();
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$url = sprintf( '%s://%s', $scheme, $domain );
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return $url;
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}
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return false;
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}
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/**
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* Formats URL
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*
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* @param string $path
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* @return string
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*/
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function _format_url( $path ) {
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$domain = $this->get_domain( $path );
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if ( $domain ) {
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$scheme = $this->_get_scheme();
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$url = sprintf( '%s://%s/%s', $scheme, $domain, $path );
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return $url;
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}
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return false;
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}
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/**
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* Returns results
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*
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* @param array $files
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* @param integer $result
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* @param string $error
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* @return array
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*/
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function _get_results( $files, $result = W3TC_CDN_RESULT_OK,
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$error = 'OK' ) {
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$results = array();
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foreach ( $files as $key => $file ) {
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if ( is_array( $file ) ) {
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$local_path = $file['local_path'];
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$remote_path = $file['remote_path'];
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} else {
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$local_path = $key;
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$remote_path = $file;
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}
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$results[] = $this->_get_result( $local_path, $remote_path, $result,
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$error, $file );
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}
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return $results;
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}
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/**
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* Returns file process result
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*
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* @param string $local_path
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* @param string $remote_path
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* @param integer $result
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* @param string $error
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* @return array
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*/
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function _get_result( $local_path, $remote_path,
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$result = W3TC_CDN_RESULT_OK, $error = 'OK', $descriptor = null ) {
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if ( $this->_config['debug'] ) {
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$this->_log( $local_path, $remote_path, $error );
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}
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return array(
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'local_path' => $local_path,
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'remote_path' => $remote_path,
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'result' => $result,
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'error' => $error,
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'descriptor' => $descriptor
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);
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}
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/**
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* Check for errors
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*
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* @param array $results
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* @return bool
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*/
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function _is_error( $results ) {
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foreach ( $results as $result ) {
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if ( $result['result'] != W3TC_CDN_RESULT_OK ) {
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return true;
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}
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}
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return false;
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}
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/**
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* Returns headers for file
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*
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* @param array $file CDN file array
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* @param array $whitelist which expensive headers to calculate
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* @return array
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*/
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function get_headers_for_file( $file, $whitelist = array() ) {
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$local_path = $file['local_path'];
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$mime_type = Util_Mime::get_mime_type( $local_path );
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$link = $file['original_url'];
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$headers = array(
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'Content-Type' => $mime_type,
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'Last-Modified' => Util_Content::http_date( time() ),
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'Access-Control-Allow-Origin' => '*',
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'Link' => '<' . $link .'>; rel="canonical"'
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);
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$section = Util_Mime::mime_type_to_section( $mime_type );
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if ( isset( $this->_config['headers'][$section] ) ) {
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$hc = $this->_config['headers'][$section];
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if ( isset( $whitelist['ETag'] ) && $hc['etag'] ) {
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$headers['ETag'] = '"' . @md5_file( $local_path ) . '"';
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}
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if ( $hc['expires'] ) {
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$headers['Expires'] = Util_Content::http_date( time() +
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$hc['lifetime'] );
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$expires_set = true;
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}
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$headers = array_merge( $headers, $hc['static'] );
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}
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return $headers;
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}
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/**
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* Use gzip compression only for text-based files
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*
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* @param string $file
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* @return boolean
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*/
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function _may_gzip( $file ) {
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/**
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* Remove query string
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*/
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$file = preg_replace( '~\?.*$~', '', $file );
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/**
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* Check by file extension
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*/
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if ( preg_match( '~\.(ico|js|css|xml|xsd|xsl|svg|htm|html|txt)$~i',
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$file ) ) {
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return true;
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}
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return false;
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}
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/**
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* Test domains
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*
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* @param string $error
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* @return boolean
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*/
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function _test_domains( &$error ) {
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$domains = $this->get_domains();
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if ( !count( $domains ) ) {
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$error = 'Empty hostname / CNAME list.';
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return false;
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}
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foreach ( $domains as $domain ) {
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$_domains = array_map( 'trim', explode( ',', $domain ) );
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foreach ( $_domains as $_domain ) {
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$matches = null;
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if ( preg_match( '~^([a-z0-9\-\.]*)~i', $_domain, $matches ) ) {
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$hostname = $matches[1];
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} else {
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$hostname = $_domain;
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}
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if ( empty( $hostname ) ) {
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continue;
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}
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if ( gethostbyname( $hostname ) === $hostname ) {
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$error = sprintf( 'Unable to resolve hostname: %s.',
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$hostname );
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return false;
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}
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}
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}
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return true;
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}
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/**
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* Check if css file
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*
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* @param string $path
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* @return boolean
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*/
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function _is_css( $path ) {
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return preg_match( '~[a-zA-Z0-9\-_]*(\.include\.[0-9]+)?\.css$~',
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$path );
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}
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/**
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* Check if JS file in heeader
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*
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* @param string $path
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* @return boolean
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*/
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function _is_js( $path ) {
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return preg_match( '~([a-z0-9\-_]+(\.include\.[a-z0-9]+)\.js)$~',
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$path ) ||
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preg_match( '~[\w\d\-_]+\.js~', $path );
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}
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/**
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* Check if JS file after body
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*
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* @param string $path
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* @return boolean
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*/
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function _is_js_body( $path ) {
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return preg_match( '~[a-z0-9\-_]+(\.include-body\.[a-z0-9]+)\.js$~',
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$path );
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}
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/**
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* Check if JS file before /body
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*
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* @param string $path
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* @return boolean
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*/
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function _is_js_footer( $path ) {
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return preg_match( '~[a-z0-9\-_]+(\.include-footer\.[a-z0-9]+)\.js$~',
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$path );
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}
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/**
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* Returns domain for path
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*
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* @param array $domains
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* @param string $path
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* @return string
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*/
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function _get_domain( $domains, $path ) {
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$count = count( $domains );
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if ( isset( $domains['http_default'] ) )
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$count--;
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if ( isset( $domains['https_default'] ) )
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$count--;
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if ( $count ) {
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/**
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* Use for equal URLs same host to allow caching by browser
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*/
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$hash = $this->_get_hash( $path );
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$domain = $domains[$hash % $count];
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return $domain;
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}
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return false;
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}
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/**
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* Returns integer hash for key
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*
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* @param string $key
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* @return integer
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*/
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function _get_hash( $key ) {
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$hash = abs( crc32( $key ) );
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return $hash;
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}
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/**
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* Returns scheme
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*
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* @return string
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*/
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function _get_scheme() {
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switch ( $this->_config['ssl'] ) {
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default:
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case 'auto':
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$scheme = ( Util_Environment::is_https() ? 'https' : 'http' );
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break;
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case 'enabled':
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$scheme = 'https';
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break;
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case 'disabled':
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$scheme = 'http';
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break;
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case 'rejected':
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$scheme = 'http';
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break;
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}
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return $scheme;
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}
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/**
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* Write log entry
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*
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* @param string $local_path
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* @param string $remote_path
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* @param string $error
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* @return bool|int
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*/
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function _log( $local_path, $remote_path, $error ) {
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$data = sprintf( "[%s] [%s => %s] %s\n", date( 'r' ), $local_path,
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$remote_path, $error );
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$data = strtr( $data, '<>', '..' );
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$filename = Util_Debug::log_filename( 'cdn' );
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return @file_put_contents( $filename, $data, FILE_APPEND );
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}
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/**
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* Our error handler
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*
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* @param integer $errno
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* @param string $errstr
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* @return boolean
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*/
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function _error_handler( $errno, $errstr ) {
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$this->_last_error = $errstr;
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return false;
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}
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/**
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* Returns last error
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*
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* @return string
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*/
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function _get_last_error() {
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return $this->_last_error;
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}
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|
/**
|
|
* Set our error handler
|
|
*
|
|
* @return void
|
|
*/
|
|
function _set_error_handler() {
|
|
set_error_handler( array(
|
|
$this,
|
|
'_error_handler'
|
|
) );
|
|
}
|
|
|
|
/**
|
|
* Restore prev error handler
|
|
*
|
|
* @return void
|
|
*/
|
|
function _restore_error_handler() {
|
|
restore_error_handler();
|
|
}
|
|
|
|
/**
|
|
* How and if headers should be set
|
|
*
|
|
* @return string W3TC_CDN_HEADER_NONE, W3TC_CDN_HEADER_UPLOADABLE,
|
|
* W3TC_CDN_HEADER_MIRRORING
|
|
*/
|
|
function headers_support() {
|
|
return W3TC_CDN_HEADER_NONE;
|
|
}
|
|
}
|