125 lines
2.9 KiB
PHP
125 lines
2.9 KiB
PHP
<?php
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/**
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* The class maps settings and options from imageproxy.
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*
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* @package \Optml\Inc
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* @author Optimole <friends@optimole.com>
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*/
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abstract class Optml_Resource {
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use Optml_Validator;
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use Optml_Normalizer;
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/**
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* Signature size.
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*/
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const SIGNATURE_SIZE = 8;
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/**
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* Source image url.
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*
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* @var string Source image.
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*/
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protected $source_url = '';
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/**
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* Cache Buster passed from Optimole Service.
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*
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* @var string Active Cache Buster
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*/
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protected $cache_buster = '';
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/**
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* Optml_Resource constructor.
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*
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* @param string $url Source image url.
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* @param string $cache_buster The cache buster.
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*
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* @throws \InvalidArgumentException In case that the url is not provided.
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*/
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public function __construct( $url = '', $cache_buster = '' ) {
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if ( empty( $url ) ) {
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throw new \InvalidArgumentException( 'Optimole resource builder requires the source url to optimize.' ); // @codeCoverageIgnore
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}
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$this->set_defaults();
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$this->source_url = apply_filters( 'optml_processed_url', $url );
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$this->cache_buster = $cache_buster;
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}
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/**
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* Set defaults for resource transformations.
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*/
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abstract protected function set_defaults();
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/**
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* Return transformed url.
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*
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* @param array $params Either will be signed or not.
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*
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* @return string Transformed image url.
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*/
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abstract public function get_url( $params = [] );
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/**
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* Method to generate tokens and cache them for further requests.
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*
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* @param string $source The source string to tokenize.
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* @param int $size The size of bites for the generated token.
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*
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* @return string
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*/
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private function get_token_from_cache( $source, $size = 8 ) {
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$key = crc32( $source );
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$cache_token = wp_cache_get( $key, 'optml_cache_tokens' );
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if ( $cache_token === false ) {
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$cache_token = $this->get_signature( $source, $size );
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wp_cache_add( $key, $cache_token, 'optml_cache_tokens', DAY_IN_SECONDS );
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}
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return $cache_token;
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}
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/**
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* Get the token for the domain.
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*
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* @return string
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*/
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public function get_domain_token() {
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$parts = parse_url( $this->source_url );
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$domain = isset( $parts['host'] ) ? str_replace( 'www.', '', $parts['host'] ) : '';
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return $this->get_token_from_cache( $domain, 5 );
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}
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/**
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* Return a the cache buster, defaults to the url token used previously.
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*
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* @return string|bool
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*/
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public function get_cache_buster() {
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if ( $this->cache_buster !== '' ) {
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return $this->cache_buster;
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}
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return false;
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}
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/**
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* Return the url signature.
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*
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* @param string $string The path from url.
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*
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* @return bool|string
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*/
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public function get_signature( $string = '', $size = self::SIGNATURE_SIZE ) {
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$binary = hash_hmac( 'sha256', Optml_Config::$secret . $string, Optml_Config::$key, true );
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$binary = pack( 'A' . $size, $binary );
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$signature = rtrim( strtr( base64_encode( $binary ), '+/', '-_' ), '=' );
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return $signature;
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}
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}
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