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<?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;
}
}
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