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<?php
/**
* Copyright 2014 Facebook, Inc.
*
* You are hereby granted a non-exclusive, worldwide, royalty-free license to
* use, copy, modify, and distribute this software in source code or binary
* form for use in connection with the web services and APIs provided by
* Facebook.
*
* As with any software that integrates with the Facebook platform, your use
* of this software is subject to the Facebook Developer Principles and
* Policies [http://developers.facebook.com/policy/]. This copyright notice
* shall be included in all copies or substantial portions of the software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
namespace Facebook\HttpClients;
use Facebook\Http\GraphRawResponse;
use Facebook\Exceptions\FacebookSDKException;
/**
* Class FacebookCurlHttpClient
*
* @package Facebook
*/
class FacebookCurlHttpClient implements FacebookHttpClientInterface
{
/**
* @var string The client error message
*/
protected $curlErrorMessage = '';
/**
* @var int The curl client error code
*/
protected $curlErrorCode = 0;
/**
* @var string|boolean The raw response from the server
*/
protected $rawResponse;
/**
* @var FacebookCurl Procedural curl as object
*/
protected $facebookCurl;
/**
* @const Curl Version which is unaffected by the proxy header length error.
*/
const CURL_PROXY_QUIRK_VER = 0x071E00;
/**
* @const "Connection Established" header text
*/
const CONNECTION_ESTABLISHED = "HTTP/1.0 200 Connection established\r\n\r\n";
/**
* @param FacebookCurl|null Procedural curl as object
*/
public function __construct(FacebookCurl $facebookCurl = null)
{
$this->facebookCurl = $facebookCurl ?: new FacebookCurl();
}
/**
* @inheritdoc
*/
public function send($url, $method, $body, array $headers, $timeOut)
{
$this->openConnection($url, $method, $body, $headers, $timeOut);
$this->sendRequest();
if ($curlErrorCode = $this->facebookCurl->errno()) {
throw new FacebookSDKException($this->facebookCurl->error(), $curlErrorCode);
}
// Separate the raw headers from the raw body
list($rawHeaders, $rawBody) = $this->extractResponseHeadersAndBody();
$this->closeConnection();
return new GraphRawResponse($rawHeaders, $rawBody);
}
/**
* Opens a new curl connection.
*
* @param string $url The endpoint to send the request to.
* @param string $method The request method.
* @param string $body The body of the request.
* @param array $headers The request headers.
* @param int $timeOut The timeout in seconds for the request.
*/
public function openConnection($url, $method, $body, array $headers, $timeOut)
{
$options = [
CURLOPT_CUSTOMREQUEST => $method,
CURLOPT_HTTPHEADER => $this->compileRequestHeaders($headers),
CURLOPT_URL => $url,
CURLOPT_CONNECTTIMEOUT => 10,
CURLOPT_TIMEOUT => $timeOut,
CURLOPT_RETURNTRANSFER => true, // Follow 301 redirects
CURLOPT_HEADER => true, // Enable header processing
CURLOPT_SSL_VERIFYHOST => 2,
CURLOPT_SSL_VERIFYPEER => true,
CURLOPT_CAINFO => __DIR__ . '/certs/DigiCertHighAssuranceEVRootCA.pem',
];
if ($method !== "GET") {
$options[CURLOPT_POSTFIELDS] = $body;
}
$this->facebookCurl->init();
$this->facebookCurl->setoptArray($options);
}
/**
* Closes an existing curl connection
*/
public function closeConnection()
{
$this->facebookCurl->close();
}
/**
* Send the request and get the raw response from curl
*/
public function sendRequest()
{
$this->rawResponse = $this->facebookCurl->exec();
}
/**
* Compiles the request headers into a curl-friendly format.
*
* @param array $headers The request headers.
*
* @return array
*/
public function compileRequestHeaders(array $headers)
{
$return = [];
foreach ($headers as $key => $value) {
$return[] = $key . ': ' . $value;
}
return $return;
}
/**
* Extracts the headers and the body into a two-part array
*
* @return array
*/
public function extractResponseHeadersAndBody()
{
$headerSize = $this->getHeaderSize();
$rawHeaders = mb_substr($this->rawResponse, 0, $headerSize);
$rawBody = mb_substr($this->rawResponse, $headerSize);
return [trim($rawHeaders), trim($rawBody)];
}
/**
* Return proper header size
*
* @return integer
*/
private function getHeaderSize()
{
$headerSize = $this->facebookCurl->getinfo(CURLINFO_HEADER_SIZE);
// This corrects a Curl bug where header size does not account
// for additional Proxy headers.
if ($this->needsCurlProxyFix()) {
// Additional way to calculate the request body size.
if (preg_match('/Content-Length: (\d+)/', $this->rawResponse, $m)) {
$headerSize = mb_strlen($this->rawResponse) - $m[1];
} elseif (stripos($this->rawResponse, self::CONNECTION_ESTABLISHED) !== false) {
$headerSize += mb_strlen(self::CONNECTION_ESTABLISHED);
}
}
return $headerSize;
}
/**
* Detect versions of Curl which report incorrect header lengths when
* using Proxies.
*
* @return boolean
*/
private function needsCurlProxyFix()
{
$ver = $this->facebookCurl->version();
$version = $ver['version_number'];
return $version < self::CURL_PROXY_QUIRK_VER;
}
}
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