<?php

class CAS_Request_CurlRequest extends CAS_Request_AbstractRequest implements CAS_Request_RequestInterface
{
	private $_curlOptions = array();


	/**
	 * Set additional curl options
	 *
	 * @param array $options option to set
	 *
	 * @return void
	 */
	public function setCurlOptions(array $options)
	{
		$this->_curlOptions = $options;
	}


	/**
	 * Send the request and store the results.
	 *
	 * @return bool true on success, false on failure.
	 */
	protected function sendRequest()
	{
		phpCAS::traceBegin();

		/*********************************************************
		 * initialize the CURL session
		*********************************************************/
		$ch = $this->initAndConfigure();

		/*********************************************************
		 * Perform the query
		*********************************************************/
		$buf = curl_exec($ch);
		if ( $buf === false ) {
		    phpCAS::trace('curl_exec() failed');
		    $this->storeErrorMessage(
		        'CURL error #'.curl_errno($ch).': '.curl_error($ch)
		    );
		    $res = false;
		} else {
		    $this->storeResponseBody($buf);
		    phpCAS::trace("Response Body: \n".$buf."\n");
		    $res = true;

		}
		// close the CURL session
		curl_close($ch);

		phpCAS::traceEnd($res);
		return $res;
	}


	/**
	 * Internal method to initialize our cURL handle and configure the request.
	 * This method should NOT be used outside of the CurlRequest or the
	 * CurlMultiRequest.
	 *
	 * @return resource|false The cURL handle on success, false on failure
	 */
	public function initAndConfigure()
	{
		$ch = curl_init($this->url);

		curl_setopt_array($ch, $this->_curlOptions);

		/*********************************************************
		 * Set SSL configuration
		*********************************************************/
		if ($this->caCertPath) {
		    if ($this->validateCN) {
		        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
		    } else {
		        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
		    }
		    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
		    curl_setopt($ch, CURLOPT_CAINFO, $this->caCertPath);
		    phpCAS::trace('CURL: Set CURLOPT_CAINFO ' . $this->caCertPath);
		} else {
		    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
		    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
		}

		/*********************************************************
		 * Configure curl to capture our output.
		*********************************************************/
		// return the CURL output into a variable
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

		// get the HTTP header with a callback
		curl_setopt($ch, CURLOPT_HEADERFUNCTION, array($this, '_curlReadHeaders'));

		/*********************************************************
		 * Add cookie headers to our request.
		*********************************************************/
		if (count($this->cookies)) {
		    $cookieStrings = array();
		    foreach ($this->cookies as $name => $val) {
		        $cookieStrings[] = $name.'='.$val;
		    }
		    curl_setopt($ch, CURLOPT_COOKIE, implode(';', $cookieStrings));
		}

		/*********************************************************
		 * Add any additional headers
		*********************************************************/
		if (count($this->headers)) {
		    curl_setopt($ch, CURLOPT_HTTPHEADER, $this->headers);
		}

		/*********************************************************
		 * Flag and Body for POST requests
		*********************************************************/
		if ($this->isPost) {
		    curl_setopt($ch, CURLOPT_POST, 1);
		    curl_setopt($ch, CURLOPT_POSTFIELDS, $this->postBody);
		}

		/*********************************************************
		 * Set User Agent
		 *********************************************************/
		curl_setopt($ch, CURLOPT_USERAGENT, 'phpCAS/' . phpCAS::getVersion());

		return $ch;
	}


	/**
	 * Store the response body.
	 * This method should NOT be used outside of the CurlRequest or the
	 * CurlMultiRequest.
	 *
	 * @param string $body body to stor
	 *
	 * @return void
	 */
	public function _storeResponseBody($body)
	{
		$this->storeResponseBody($body);
	}


	/**
	 * Internal method for capturing the headers from a curl request.
	 *
	 * @param resource $ch     handle of curl
	 * @param string $header header
	 *
	 * @return int
	 */
	public function _curlReadHeaders($ch, $header)
	{
		$this->storeResponseHeader($header);
		return strlen($header);
	}
}
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