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File: policy.class.php
<?php /* * Copyright 2010-2013 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 /** * Simplifies the process of signing JSON policy documents. * * @version 2011.04.25 * @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 CFPolicy { /** * Stores the object that contains the authentication credentials. */ public $auth; /** * Stores the policy object that we're working with. */ public $json_policy; /** * Constructs a new instance of this class. * * @param CFRuntime $auth (Required) An instance of any authenticated AWS object that is an instance of <CFRuntime> (e.g. <AmazonEC2>, <AmazonS3>). * @param string|array $policy (Required) The associative array representing the S3 policy to use, or a string of JSON content. * @return $this A reference to the current instance. * @link http://docs.amazonwebservices.com/AmazonS3/2006-03-01/dev/index.html?HTTPPOSTForms.html S3 Policies * @link http://docs.amazonwebservices.com/AmazonS3/latest/dev/index.html?AccessPolicyLanguage.html Access Policy Language */ public function __construct($auth, $policy) { $this->auth = $auth; if (is_array($policy)) // We received an associative array... { $this->json_policy = json_encode($policy); } else // We received a valid, parseable JSON string... { $this->json_policy = json_encode(json_decode($policy, true)); } return $this; } /** * Alternate approach to constructing a new instance. Supports chaining. * * @param CFRuntime $auth (Required) An instance of any authenticated AWS object that is an instance of <CFRuntime> (e.g. <AmazonEC2>, <AmazonS3>). * @param string|array $policy (Required) The associative array representing the S3 policy to use, or a string of JSON content. * @return $this A reference to the current instance. */ public static function init($auth, $policy) { if (version_compare(PHP_VERSION, '5.3.0', '<')) { throw new Exception('PHP 5.3 or newer is required to instantiate a new class with CLASS::init().'); } $self = get_called_class(); return new $self($auth, $policy); } /** * Get the key from the authenticated instance. * * @return string The key from the authenticated instance. */ public function get_key() { return $this->auth->key; } /** * Base64-encodes the JSON string. * * @return string The Base64-encoded version of the JSON string. */ public function get_policy() { return base64_encode($this->json_policy); } /** * Gets the JSON string with the whitespace removed. * * @return string The JSON string without extraneous whitespace. */ public function get_json() { return $this->json_policy; } /** * Gets the JSON string with the whitespace removed. * * @return string The Base64-encoded, signed JSON string. */ public function get_policy_signature() { return base64_encode(hash_hmac('sha1', $this->get_policy(), $this->auth->secret_key)); } /** * Decode a policy that was returned from the service. * * @param string $response (Required) The policy returned by AWS that you want to decode into an object. * @return string The Base64-encoded, signed JSON string. */ public static function decode_policy($response) { return json_decode(urldecode($response), true); } }