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<?php

class Requests_Proxy_HTTP implements Requests_Proxy
{
    public $proxy;
    public $user;
    public $pass;
    public $use_authentication;
    public function __construct($args = null)
    {
        if (is_string($args)) {
            $this->proxy = $args;
        } elseif (is_array($args)) {
            if (count($args) == 1) {
                list($this->proxy) = $args;
            } elseif (count($args) == 3) {
                list($this->proxy, $this->user, $this->pass) = $args;
                $this->use_authentication = true;
            } else {
                throw new Requests_Exception('Invalid number of arguments', 'proxyhttpbadargs');
            }
        }
    }
    public function register(Requests_Hooks &$hooks)
    {
        $hooks->register('curl.before_send', array(&$this, 'curl_before_send'));
        $hooks->register('fsockopen.remote_socket', array(&$this, 'fsockopen_remote_socket'));
        $hooks->register('fsockopen.remote_host_path', array(&$this, 'fsockopen_remote_host_path'));
        if ($this->use_authentication) {
            $hooks->register('fsockopen.after_headers', array(&$this, 'fsockopen_header'));
        }
    }
    public function curl_before_send(&$handle)
    {
        curl_setopt($handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
        curl_setopt($handle, CURLOPT_PROXY, $this->proxy);
        if ($this->use_authentication) {
            curl_setopt($handle, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
            curl_setopt($handle, CURLOPT_PROXYUSERPWD, $this->get_auth_string());
        }
    }
    public function fsockopen_remote_socket(&$remote_socket)
    {
        $remote_socket = $this->proxy;
    }
    public function fsockopen_remote_host_path(&$path, $url)
    {
        $path = $url;
    }
    public function fsockopen_header(&$out)
    {
        $out .= sprintf("Proxy-Authorization: Basic %s\r\n", base64_encode($this->get_auth_string()));
    }
    public function get_auth_string()
    {
        return $this->user . ':' . $this->pass;
    }
}