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Filename : Auth.inc
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<?php
namespace B2\Http;

use B2\Entities\B2Api;

/**
 * Author:		Shlomi
 * Date:		Sep 3, 2017 5:55:22 PM
 * Founder:		Shlomi Bazak (SBZsoft) (c)
 * File: 		auth.inc
 *  
 * Description:
 *		
 */
 
// No direct access.
defined("__NSS__") or die("Restrected Access.");

class Auth {
	private $_orgAccountId;
	private $_accountId;
	private $_applicationKey;
	private $_client;
	
	private $_authToken;
	private $_apiUrl;
	private $_downloadUrl;
	private $_authTime;
	
	const AUTH_EXPIRES_AFTER = 85000; // 86400 is the max valid token - we use less than that.
	
	public function __construct($accountId, $applicationKey, B2Client $client){
		$this->_orgAccountId = $accountId;
		$this->_applicationKey = $applicationKey;
		$this->_client = $client;
		$this->authenticate();
	}
	
	public function authenticate(){
		$this->_authToken = null;
		$response = $this->_client->_requestJson(
				B2Client::METHOD_GET, 
				"https://api.backblazeb2.com/b2api/v1/" . B2Api::AUTHORIZE_ACCOUNT, 
				['headers' => ['Authorization' => "Basic " . base64_encode("{$this->_orgAccountId}:{$this->_applicationKey}")]]
			);
		$this->_accountId = $response['accountId'];
		$this->_authToken = $response['authorizationToken'];
		$this->_apiUrl = $response['apiUrl'].'/b2api/v1/';
		$this->_downloadUrl = $response['downloadUrl'];
		$this->_authTime = time();
	}
	/**
	 * 
	 * @return string accountId
	 */
	public function getAccountId(){ return $this->_accountId; }
	
	/**
	 * 
	 * @return string applicationKey
	 */
	public function getApplicationKey(){ return $this->_applicationKey; }
	
	/**
	 * 
	 * @return string authToken Null if authentication is unsuccessful
	 */
	public function getAuthToken(){ 
		if($this->hasTokenExpired()) $this->authenticate();
		return $this->_authToken; 
	}
	
	/**
	 *
	 * @return string apiUrl Null if authentication is unsuccessful
	 */
	public function getApiUrl(){ return $this->_apiUrl; }
	
	/**
	 *
	 * @return string downloadUrl Null if authentication is unsuccessful
	 */
	public function getDownloadUrl(){ return $this->_downloadUrl; }
	
	/**
	 * Get last successfull authentication timestamp 
	 * @return int timestamp of the last authentication
	 */
	public function getAuthTime(){ return $this->_authTime; }
	
	/**
	 * Check if token is expired
	 * @return bool true iff the token has expired.
	 */
	public function hasTokenExpired(){ return (self::AUTH_EXPIRES_AFTER-(time()-$this->getAuthTime()))<=0; }

}