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<?phpnamespace Aws\Credentials;
 
 /**
 * Provides access to the AWS credentials used for accessing AWS services: AWS
 * access key ID, secret access key, and security token. These credentials are
 * used to securely sign requests to AWS services.
 */
 interface CredentialsInterface
 {
 /**
 * Returns the AWS access key ID for this credentials object.
 *
 * @return string
 */
 public function getAccessKeyId();
 
 /**
 * Returns the AWS secret access key for this credentials object.
 *
 * @return string
 */
 public function getSecretKey();
 
 /**
 * Get the associated security token if available
 *
 * @return string|null
 */
 public function getSecurityToken();
 
 /**
 * Get the UNIX timestamp in which the credentials will expire
 *
 * @return int|null
 */
 public function getExpiration();
 
 /**
 * Check if the credentials are expired
 *
 * @return bool
 */
 public function isExpired();
 
 /**
 * Converts the credentials to an associative array.
 *
 * @return array
 */
 public function toArray();
 }
 
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