credentials.class.php
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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
/**
* The <CFCredentials> 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 {}