CurlHttpRequest.php

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<?php
class CurlHttpRequest extends MWHttpRequest {
    public const SUPPORTS_FILE_POSTS = true;
 
    protected $curlOptions = [];
    protected $headerText = "";
 
    public function __construct() {
        if ( !function_exists( 'curl_init' ) ) {
            throw new RuntimeException(
                __METHOD__ . ': curl (https://www.php.net/curl) is not installed' );
        }
 
        parent::__construct( ...func_get_args() );
    }
 
    protected function readHeader( $fh, $content ) {
        $this->headerText .= $content;
        return strlen( $content );
    }
 
    public function execute() {
        $this->prepare();
 
        if ( !$this->status->isOK() ) {
            return Status::wrap( $this->status ); // TODO B/C; move this to callers
        }
 
        $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
        $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
        $this->curlOptions[CURLOPT_CONNECTTIMEOUT_MS] = $this->connectTimeout * 1000;
        $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
        $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
        $this->curlOptions[CURLOPT_HEADERFUNCTION] = [ $this, "readHeader" ];
        $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
        $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 
        $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 
        $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost ? 2 : 0;
        $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 
        if ( $this->caInfo ) {
            $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
        }
 
        if ( $this->headersOnly ) {
            $this->curlOptions[CURLOPT_NOBODY] = true;
            $this->curlOptions[CURLOPT_HEADER] = true;
        } elseif ( $this->method == 'POST' ) {
            $this->curlOptions[CURLOPT_POST] = true;
            $postData = $this->postData;
            // Don't interpret POST parameters starting with '@' as file uploads, because this
            // makes it impossible to POST plain values starting with '@' (and causes security
            // issues potentially exposing the contents of local files).
            $this->curlOptions[CURLOPT_SAFE_UPLOAD] = true;
            $this->curlOptions[CURLOPT_POSTFIELDS] = $postData;
 
            // Suppress 'Expect: 100-continue' header, as some servers
            // will reject it with a 417 and Curl won't auto retry
            // with HTTP 1.0 fallback
            $this->reqHeaders['Expect'] = '';
        } else {
            $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
        }
 
        $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 
        $curlHandle = curl_init( $this->url );
 
        if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
            $this->status->fatal( 'http-internal-error' );
            throw new InvalidArgumentException( "Error setting curl options." );
        }
 
        if ( $this->followRedirects && $this->canFollowRedirects() ) {
            Wikimedia\suppressWarnings();
            if ( !curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
                $this->logger->debug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
                    "Probably open_basedir is set." );
                // Continue the processing. If it were in curl_setopt_array,
                // processing would have halted on its entry
            }
            Wikimedia\restoreWarnings();
        }
 
        if ( $this->profiler ) {
            $profileSection = $this->profiler->scopedProfileIn(
                __METHOD__ . '-' . $this->profileName
            );
        }
 
        $curlRes = curl_exec( $curlHandle );
        if ( curl_errno( $curlHandle ) == CURLE_OPERATION_TIMEOUTED ) {
            $this->status->fatal( 'http-timed-out', $this->url );
        } elseif ( $curlRes === false ) {
            $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
        } else {
            $this->headerList = explode( "\r\n", $this->headerText );
        }
 
        curl_close( $curlHandle );
 
        if ( $this->profiler ) {
            $this->profiler->scopedProfileOut( $profileSection );
        }
 
        $this->parseHeader();
        $this->setStatus();
 
        return Status::wrap( $this->status ); // TODO B/C; move this to callers
    }
 
    public function canFollowRedirects() {
        $curlVersionInfo = curl_version();
        if ( $curlVersionInfo['version_number'] < 0x071304 ) {
            $this->logger->debug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037" );
            return false;
        }
 
        return true;
    }
}