* Facebook support

1 files changed, 210 insertions, 0 deletions

diff --git a/lib/facebook-graph-sdk/src/Facebook/HttpClients/FacebookCurlHttpClient.php b/lib/facebook-graph-sdk/src/Facebook/HttpClients/FacebookCurlHttpClient.php
new file mode 100644
index 0000000..955ac06
--- /dev/null
+++ b/lib/facebook-graph-sdk/src/Facebook/HttpClients/FacebookCurlHttpClient.php
@@ -0,0 +1,210 @@
+<?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;
+    }
+}