Curl.php

<?php


/*
 * This file is part of the JsonSchema package.
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace JsonSchema\Uri\Retrievers;

use JsonSchema\Exception\RuntimeException;
use JsonSchema\Validator;

/**
 * Tries to retrieve JSON schemas from a URI using cURL library
 *
 * @author Sander Coolen <sander@jibber.nl>
 */
class Curl extends AbstractRetriever {
    protected $messageBody;
    public function __construct() {
        if (!function_exists('curl_init')) {
            // Cannot test this, because curl_init is present on all test platforms plus mock
            throw new RuntimeException('cURL not installed');
            // @codeCoverageIgnore
        }
    }
    
    /**
     * {@inheritdoc}
     *
     * @see \JsonSchema\Uri\Retrievers\UriRetrieverInterface::retrieve()
     */
    public function retrieve($uri) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $uri);
        curl_setopt($ch, CURLOPT_HEADER, true);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            'Accept: ' . Validator::SCHEMA_MEDIA_TYPE,
        ));
        $response = curl_exec($ch);
        if (false === $response) {
            throw new \JsonSchema\Exception\ResourceNotFoundException('JSON schema not found');
        }
        $this->fetchMessageBody($response);
        $this->fetchContentType($response);
        curl_close($ch);
        return $this->messageBody;
    }
    
    /**
     * @param string $response cURL HTTP response
     */
    private function fetchMessageBody($response) {
        preg_match("/(?:\r\n){2}(.*)\$/ms", $response, $match);
        $this->messageBody = $match[1];
    }
    
    /**
     * @param string $response cURL HTTP response
     *
     * @return bool Whether the Content-Type header was found or not
     */
    protected function fetchContentType($response) {
        if (0 < preg_match("/Content-Type:(\\V*)/ims", $response, $match)) {
            $this->contentType = trim($match[1]);
            return true;
        }
        return false;
    }

}