<?php

/**

 * Basic Authentication provider

 *

 * @package Requests

 * @subpackage Authentication

 */

/**

 * Basic Authentication provider

 *

 * Provides a handler for Basic HTTP authentication via the Authorization

 * header.

 *

 * @package Requests

 * @subpackage Authentication

 */

class Requests_Auth_Basic implements Requests_Auth {

	/**

	 * Username

	 *

	 * @var string

	 */

	public $user;

	/**

	 * Password

	 *

	 * @var string

	 */

	public $pass;

	/**

	 * Constructor

	 *

	 * @throws Requests_Exception On incorrect number of arguments (`authbasicbadargs`)

	 * @param array|null $args Array of user and password. Must have exactly two elements

	 */

	public function __construct($args = null) {

		if (is_array($args)) {

			if (count($args) !== 2) {

				throw new Requests_Exception('Invalid number of arguments', 'authbasicbadargs');

			}

			list($this->user, $this->pass) = $args;

		}

	}

	/**

	 * Register the necessary callbacks

	 *

	 * @see curl_before_send

	 * @see fsockopen_header

	 * @param Requests_Hooks $hooks Hook system

	 */

	public function register(Requests_Hooks &$hooks) {

		$hooks->register('curl.before_send', array(&$this, 'curl_before_send'));

		$hooks->register('fsockopen.after_headers', array(&$this, 'fsockopen_header'));

	}

	/**

	 * Set cURL parameters before the data is sent

	 *

	 * @param resource $handle cURL resource

	 */

	public function curl_before_send(&$handle) {

		curl_setopt($handle, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);

		curl_setopt($handle, CURLOPT_USERPWD, $this->getAuthString());

	}

	/**

	 * Add extra headers to the request before sending

	 *

	 * @param string $out HTTP header string

	 */

	public function fsockopen_header(&$out) {

		$out .= sprintf("Authorization: Basic %s\r\n", base64_encode($this->getAuthString()));

	}

	/**

	 * Get the authentication string (user:pass)

	 *

	 * @return string

	 */

	public function getAuthString() {

		return $this->user . ':' . $this->pass;

	}

}