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 (JSON).
 *
 * @version 2011.12.08
 * @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 AuthV3JSON extends Signer implements Signable
{
        /**
         * Constructs a new instance of the <AuthV3JSON> 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();
                $return_curl_handle = false;
                $x_amz_target = null;
                $query = array('body' => $this->payload);

                // Do we have an authentication token?
                if ($this->auth_token)
                {
                        $headers['X-Amz-Security-Token'] = $this->auth_token;
                        $query['SecurityToken'] = $this->auth_token;
                }

                // Manage the key-value pairs that are used in the query.
                if (stripos($this->operation, 'x-amz-target') !== false)
                {
                        $x_amz_target = trim(str_ireplace('x-amz-target:', '', $this->operation));
                }
                else
                {
                        $query['Action'] = $this->operation;
                }

                // Only add it if it exists.
                if ($this->api_version)
                {
                        $query['Version'] = $this->api_version;
                }

                $curlopts = array();

                // 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');

                // Normalize JSON input
                if (isset($query['body']) && $query['body'] === '[]')
                {
                        $query['body'] = '{}';
                }

                // Create the string that needs to be hashed.
                $canonical_query_string = $this->util->encode_signature2($query['body']);

                // 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';

                // Signing using X-Amz-Target is handled differently.
                $headers['X-Amz-Target'] = $x_amz_target;
                $headers['Content-Type'] = 'application/x-amz-json-1.0';
                $request->set_body($query['body']);
                $this->querystring = $query['body'];

                // 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 (HTTP)
                $this->string_to_sign = "POST\n$request_uri\n\n";

                // 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-'
                        )
                        {
                                $this->string_to_sign .= strtolower($header_key) . ':' . $header_value . "\n";
                                $signed_headers[] = $header_key;
                        }
                }

                $this->string_to_sign .= "\n";

                if (isset($query['body']) && $query['body'] !== '')
                {
                        $this->string_to_sign .= $query['body'];
                }

                // Convert from string-to-sign to bytes-to-sign
                $bytes_to_sign = hash('sha256', $this->string_to_sign, true);

                // Hash the AWS secret key and generate a signature for the request.
                $signature = base64_encode(hash_hmac('sha256', $bytes_to_sign, $this->secret_key, true));

                $headers['X-Amzn-Authorization'] = 'AWS3'
                        . ' 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;
        }
}