<?php 
namespace 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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