Subversion-Projekte lars-tiefland.php_share

<?php

/*

 * Copyright 2010-2012 Amazon.com, Inc. or its affiliates. All Rights Reserved.

 *

 * Licensed under the Apache License, Version 2.0 (the "License").

 * You may not use this file except in compliance with the License.

 * A copy of the License is located at

 *

 *  http://aws.amazon.com/apache2.0

 *

 * or in the "license" file accompanying this file. This file is distributed

 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either

 * express or implied. See the License for the specific language governing

 * permissions and limitations under the License.

 */

/*%******************************************************************************************%*/

// CLASS

/**

 * Implements support for Signature v3 (AWS Query).

 *

 * @version 2011.11.22

 * @license See the included NOTICE.md file for more information.

 * @copyright See the included NOTICE.md file for more information.

 * @link http://aws.amazon.com/php/ PHP Developer Center

 */

class AuthV3Query extends Signer implements Signable

{

	/**

	 * Constructs a new instance of the <AuthV3Query> class.

	 *

	 * @param string $endpoint (Required) The endpoint to direct the request to.

	 * @param string $operation (Required) The operation to execute as a result of this request.

	 * @param array $payload (Required) The options to use as part of the payload in the request.

	 * @param CFCredential $credentials (Required) The credentials to use for signing and making requests.

	 * @return void

	 */

	public function __construct($endpoint, $operation, $payload, CFCredential $credentials)

	{

		parent::__construct($endpoint, $operation, $payload, $credentials);

	}

	/**

	 * Generates a cURL handle with all of the required authentication bits set.

	 *

	 * @return resource A cURL handle ready for executing.

	 */

	public function authenticate()

	{

		// Determine signing values

		$current_time = time();

		$date = gmdate(CFUtilities::DATE_FORMAT_RFC2616, $current_time);

		$timestamp = gmdate(CFUtilities::DATE_FORMAT_ISO8601, $current_time);

		$nonce = $this->util->generate_guid();

		$curlopts = array();

		$signed_headers = array();

		// Do we have an authentication token?

		if ($this->auth_token)

		{

			$headers['X-Amz-Security-Token'] = $this->auth_token;

			$query['SecurityToken'] = $this->auth_token;

		}

		$query['Action'] = $this->operation;

		$query['Version'] = $this->api_version;

		// Set custom CURLOPT settings

		if (is_array($this->payload) && isset($this->payload['curlopts']))

		{

			$curlopts = $this->payload['curlopts'];

			unset($this->payload['curlopts']);

		}

		// Merge in any options that were passed in

		if (is_array($this->payload))

		{

			$query = array_merge($query, $this->payload);

		}

		$return_curl_handle = isset($query['returnCurlHandle']) ? $query['returnCurlHandle'] : false;

		unset($query['returnCurlHandle']);

		// Do a case-sensitive, natural order sort on the array keys.

		uksort($query, 'strcmp');

		$canonical_query_string = $this->util->to_signable_string($query);

		// Remove the default scheme from the domain.

		$domain = str_replace(array('http://', 'https://'), '', $this->endpoint);

		// Parse our request.

		$parsed_url = parse_url('http://' . $domain);

		// Set the proper host header.

		if (isset($parsed_url['port']) && (integer) $parsed_url['port'] !== 80 && (integer) $parsed_url['port'] !== 443)

		{

			$host_header = strtolower($parsed_url['host']) . ':' . $parsed_url['port'];

		}

		else

		{

			$host_header = strtolower($parsed_url['host']);

		}

		// Set the proper request URI.

		$request_uri = isset($parsed_url['path']) ? $parsed_url['path'] : '/';

		// Generate the querystring from $query

		$this->querystring = $this->util->to_query_string($query);

		// Gather information to pass along to other classes.

		$helpers = array(

			'utilities' => $this->utilities_class,

			'request' => $this->request_class,

			'response' => $this->response_class,

		);

		// Compose the request.

		$request_url = ($this->use_ssl ? 'https://' : 'http://') . $domain;

		$request_url .= !isset($parsed_url['path']) ? '/' : '';

		// Instantiate the request class

		$request = new $this->request_class($request_url, $this->proxy, $helpers, $this->credentials);

		$request->set_method('POST');

		$request->set_body($this->querystring);

		$headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=utf-8';

		// Pass along registered stream callbacks

		if ($this->registered_streaming_read_callback)

		{

			$request->register_streaming_read_callback($this->registered_streaming_read_callback);

		}

		if ($this->registered_streaming_write_callback)

		{

			$request->register_streaming_write_callback($this->registered_streaming_write_callback);

		}

		// Add authentication headers

		$headers['X-Amz-Nonce'] = $nonce;

		$headers['Date'] = $date;

		$headers['Content-Length'] = strlen($this->querystring);

		$headers['Content-MD5'] = $this->util->hex_to_base64(md5($this->querystring));

		$headers['Host'] = $host_header;

		// Sort headers

		uksort($headers, 'strnatcasecmp');

		// Prepare the string to sign (HTTPS)

		$this->string_to_sign = $date . $nonce;

		// Add headers to request and compute the string to sign

		foreach ($headers as $header_key => $header_value)

		{

			// Strip linebreaks from header values as they're illegal and can allow for security issues

			$header_value = str_replace(array("\r", "\n"), '', $header_value);

			// Add the header if it has a value

			if ($header_value !== '')

			{

				$request->add_header($header_key, $header_value);

			}

			// Generate the string to sign

			if (

				substr(strtolower($header_key), 0, 8) === 'content-' ||

				strtolower($header_key) === 'date' ||

				strtolower($header_key) === 'expires' ||

				strtolower($header_key) === 'host' ||

				substr(strtolower($header_key), 0, 6) === 'x-amz-'

			)

			{

				$signed_headers[] = $header_key;

			}

		}

		// Hash the AWS secret key and generate a signature for the request.

		$signature = base64_encode(hash_hmac('sha256', $this->string_to_sign, $this->secret_key, true));

		$headers['X-Amzn-Authorization'] = 'AWS3-HTTPS'

			. ' AWSAccessKeyId=' . $this->key

			. ',Algorithm=HmacSHA256'

			. ',SignedHeaders=' . implode(';', $signed_headers)

			. ',Signature=' . $signature;

		$request->add_header('X-Amzn-Authorization', $headers['X-Amzn-Authorization']);

		$request->request_headers = $headers;

		return $request;

	}

}