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File: credentials.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 /** * The <CFCredentials> class enables developers to easily switch between multiple sets of credentials. * * @version 2012.07.13 * @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 CFCredentials { /** * The key used to specify the default credential set */ const DEFAULT_KEY = '@default'; /** * The key used to identify inherited credentials */ const INHERIT_KEY = '@inherit'; /** * Stores the credentials */ protected static $credentials = array(); /** * Prevents this class from being constructed */ final private function __construct() {} /** * Stores the credentials for re-use. * * @param array $credential_sets (Required) The named credential sets that should be made available to the application. * @return void */ public static function set(array $credential_sets) { // Make sure a default credential set is specified or can be inferred if (count($credential_sets) === 1) { $credential_sets[self::DEFAULT_KEY] = reset($credential_sets); } // Resolve any @inherit tags foreach ($credential_sets as $credential_name => &$credential_set) { if (is_array($credential_set)) { foreach ($credential_set as $credential_key => &$credential_value) { if ($credential_key === self::INHERIT_KEY) { if (!isset($credential_sets[$credential_value])) { throw new CFCredentials_Exception('The credential set, "' . $credential_value . '", does not exist and cannot be inherited.'); } $credential_set = array_merge($credential_sets[$credential_value], $credential_set); unset($credential_set[self::INHERIT_KEY]); } } } } // Normalize the value of the @default credential set if (isset($credential_sets[self::DEFAULT_KEY])) { $default = $credential_sets[self::DEFAULT_KEY]; if (is_string($default)) { if (!isset($credential_sets[$default])) { throw new CFCredentials_Exception('The credential set, "' . $default . '", does not exist and cannot be used as the default credential set.'); } $credential_sets[self::DEFAULT_KEY] = $credential_sets[$default]; } } // Store the credentials self::$credentials = $credential_sets; } /** * Retrieves the requested credentials from the internal credential store. * * @param string $credential_set (Optional) The name of the credential set to retrieve. The default value is set in DEFAULT_KEY. * @return stdClass A stdClass object where the properties represent the keys that were provided. */ public static function get($credential_name = self::DEFAULT_KEY) { // Make sure the credential set exists if (!isset(self::$credentials[$credential_name])) { throw new CFCredentials_Exception('The credential set, "' . $credential_name . '", does not exist and cannot be retrieved.'); } // Return the credential set as an object return new CFCredential(self::$credentials[$credential_name]); } /** * Retrieves a list of all available credential set names. * * @return CFArray A list of all available credential set names. */ public static function list_sets() { return new CFArray(array_keys(self::$credentials)); } } class CFCredentials_Exception extends Exception {}