class enables developers to easily switch between multiple sets of credentials. * * @version 2011.11.15 * @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); } elseif (!isset($credential_sets[self::DEFAULT_KEY])) { throw new CFCredentials_Exception('If more than one credential set is provided, a default credential set (identified by the key "' . self::DEFAULT_KEY . '") must be specified.'); } // Resolve any @inherit tags foreach ($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 $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]); } } class CFCredentials_Exception extends Exception {}