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<?php

/**

 * Copyright (c) 2007-2011, Servigistics, Inc.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *  - Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 *  - Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *  - Neither the name of Servigistics, Inc. nor the names of

 *    its contributors may be used to endorse or promote products derived from

 *    this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * @copyright Copyright 2007-2011 Servigistics, Inc. (http://servigistics.com)

 * @license http://solr-php-client.googlecode.com/svn/trunk/COPYING New BSD

 * @version $Id: $

 *

 * @package Apache

 * @subpackage Solr

 * @author Donovan Jimenez <djimenez@conduit-it.com>

 */

// Require Apache_Solr_HttpTransport_Abstract

require_once(dirname(__FILE__) . '/Abstract.php');

/**

 * HTTP Transport implemenation that uses the builtin http URL wrappers and file_get_contents

 */

class Apache_Solr_HttpTransport_FileGetContents extends Apache_Solr_HttpTransport_Abstract

{

	/**

	 * SVN Revision meta data for this class

	 */

	const SVN_REVISION = '$Revision:  $';

	/**

	 * SVN ID meta data for this class

	 */

	const SVN_ID = '$Id:  $';

	/**

	 * Reusable stream context resources for GET and POST operations

	 *

	 * @var resource

	 */

	private $_getContext, $_headContext, $_postContext;

	/**

	 * Initializes our reuseable get and post stream contexts

	 */

	public function __construct()

	{

		$this->_getContext = stream_context_create();

		$this->_headContext = stream_context_create();

		$this->_postContext = stream_context_create();

	}

	public function performGetRequest($url, $timeout = false)

	{

		// set the timeout if specified

		if ($timeout !== FALSE && $timeout > 0.0)

		{

			// timeouts with file_get_contents seem to need

			// to be halved to work as expected

			$timeout = (float) $timeout / 2;

			stream_context_set_option($this->_getContext, 'http', 'timeout', $timeout);

		}

		else

		{

			// use the default timeout pulled from default_socket_timeout otherwise

			stream_context_set_option($this->_getContext, 'http', 'timeout', $this->getDefaultTimeout());

		}

		// $http_response_headers will be updated by the call to file_get_contents later

		// see http://us.php.net/manual/en/wrappers.http.php for documentation

		// Unfortunately, it will still create a notice in analyzers if we don't set it here

		$http_response_header = null;

		$responseBody = @file_get_contents($url, false, $this->_getContext);

		return $this->_getResponseFromParts($responseBody, $http_response_header);

	}

	public function performHeadRequest($url, $timeout = false)

	{

		stream_context_set_option($this->_headContext, array(

				'http' => array(

					// set HTTP method

					'method' => 'HEAD',

					// default timeout

					'timeout' => $this->getDefaultTimeout()

				)

			)

		);

		// set the timeout if specified

		if ($timeout !== FALSE && $timeout > 0.0)

		{

			// timeouts with file_get_contents seem to need

			// to be halved to work as expected

			$timeout = (float) $timeout / 2;

			stream_context_set_option($this->_headContext, 'http', 'timeout', $timeout);

		}

		// $http_response_headers will be updated by the call to file_get_contents later

		// see http://us.php.net/manual/en/wrappers.http.php for documentation

		// Unfortunately, it will still create a notice in analyzers if we don't set it here

		$http_response_header = null;

		$responseBody = @file_get_contents($url, false, $this->_headContext);

		return $this->_getResponseFromParts($responseBody, $http_response_header);

	}

	public function performPostRequest($url, $rawPost, $contentType, $timeout = false)

	{

		stream_context_set_option($this->_postContext, array(

				'http' => array(

					// set HTTP method

					'method' => 'POST',

					// Add our posted content type

					'header' => "Content-Type: $contentType",

					// the posted content

					'content' => $rawPost,

					// default timeout

					'timeout' => $this->getDefaultTimeout()

				)

			)

		);

		// set the timeout if specified

		if ($timeout !== FALSE && $timeout > 0.0)

		{

			// timeouts with file_get_contents seem to need

			// to be halved to work as expected

			$timeout = (float) $timeout / 2;

			stream_context_set_option($this->_postContext, 'http', 'timeout', $timeout);

		}

		// $http_response_header will be updated by the call to file_get_contents later

		// see http://us.php.net/manual/en/wrappers.http.php for documentation

		// Unfortunately, it will still create a notice in analyzers if we don't set it here

		$http_response_header = null;

		$responseBody = @file_get_contents($url, false, $this->_postContext);

		// reset content of post context to reclaim memory

		stream_context_set_option($this->_postContext, 'http', 'content', '');

		return $this->_getResponseFromParts($responseBody, $http_response_header);

	}

	private function _getResponseFromParts($rawResponse, $httpHeaders)

	{

		//Assume 0, false as defaults

		$status = 0;

		$contentType = false;

		//iterate through headers for real status, type, and encoding

		if (is_array($httpHeaders) && count($httpHeaders) > 0)

		{

			//look at the first headers for the HTTP status code

			//and message (errors are usually returned this way)

			//

			//HTTP 100 Continue response can also be returned before

			//the REAL status header, so we need look until we find

			//the last header starting with HTTP

			//

			//the spec: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.1

			//

			//Thanks to Daniel Andersson for pointing out this oversight

			while (isset($httpHeaders[0]) && substr($httpHeaders[0], 0, 4) == 'HTTP')

			{

				// we can do a intval on status line without the "HTTP/1.X " to get the code

				$status = intval(substr($httpHeaders[0], 9));

				// remove this from the headers so we can check for more

				array_shift($httpHeaders);

			}

			//Look for the Content-Type response header and determine type

			//and encoding from it (if possible - such as 'Content-Type: text/plain; charset=UTF-8')

			foreach ($httpHeaders as $header)

			{

				// look for the header that starts appropriately

				if (strncasecmp($header, 'Content-Type:', 13) == 0)

				{

					$contentType = substr($header, 13);

					break;

				}

			}

		}

		return new Apache_Solr_HttpTransport_Response($status, $contentType, $rawResponse);

	}

}