<?php

/**
 * HTTP Proxy connection interface
 *
 * @package Requests\Proxy
 * @since   1.6
 */
namespace VendorDuplicator\WpOrg\Requests\Proxy;

use VendorDuplicator\WpOrg\Requests\Exception\ArgumentCount;
use VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument;
use VendorDuplicator\WpOrg\Requests\Hooks;
use VendorDuplicator\WpOrg\Requests\Proxy;
/**
 * HTTP Proxy connection interface
 *
 * Provides a handler for connection via an HTTP proxy
 *
 * @package Requests\Proxy
 * @since   1.6
 */
final class Http implements Proxy
{
    /**
     * Proxy host and port
     *
     * Notation: "host:port" (eg 127.0.0.1:8080 or someproxy.com:3128)
     *
     * @var string
     */
    public $proxy;
    /**
     * Username
     *
     * @var string
     */
    public $user;
    /**
     * Password
     *
     * @var string
     */
    public $pass;
    /**
     * Do we need to authenticate? (ie username & password have been provided)
     *
     * @var boolean
     */
    public $use_authentication;
    /**
     * Constructor
     *
     * @since 1.6
     *
     * @param array|string|null $args Proxy as a string or an array of proxy, user and password.
     *                                When passed as an array, must have exactly one (proxy)
     *                                or three elements (proxy, user, password).
     *
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\InvalidArgument When the passed argument is not an array, a string or null.
     * @throws \VendorDuplicator\WpOrg\Requests\Exception\ArgumentCount On incorrect number of arguments (`proxyhttpbadargs`)
     */
    public function __construct($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;
                $this->use_authentication = \true;
            } else {
                throw ArgumentCount::create('an array with exactly one element or exactly three elements', \count($args), 'proxyhttpbadargs');
            }
        } elseif ($args !== null) {
            throw InvalidArgument::create(1, '$args', 'array|string|null', \gettype($args));
        }
    }
    /**
     * Register the necessary callbacks
     *
     * @since 1.6
     * @see \VendorDuplicator\WpOrg\Requests\Proxy\Http::curl_before_send()
     * @see \VendorDuplicator\WpOrg\Requests\Proxy\Http::fsockopen_remote_socket()
     * @see \VendorDuplicator\WpOrg\Requests\Proxy\Http::fsockopen_remote_host_path()
     * @see \VendorDuplicator\WpOrg\Requests\Proxy\Http::fsockopen_header()
     * @param \VendorDuplicator\WpOrg\Requests\Hooks $hooks Hook system
     */
    public function register(Hooks $hooks)
    {
        $hooks->register('curl.before_send', [$this, 'curl_before_send']);
        $hooks->register('fsockopen.remote_socket', [$this, 'fsockopen_remote_socket']);
        $hooks->register('fsockopen.remote_host_path', [$this, 'fsockopen_remote_host_path']);
        if ($this->use_authentication) {
            $hooks->register('fsockopen.after_headers', [$this, 'fsockopen_header']);
        }
    }
    /**
     * Set cURL parameters before the data is sent
     *
     * @since 1.6
     * @param resource|\CurlHandle $handle cURL handle
     */
    public function curl_before_send(&$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());
        }
    }
    /**
     * Alter remote socket information before opening socket connection
     *
     * @since 1.6
     * @param string $remote_socket Socket connection string
     */
    public function fsockopen_remote_socket(&$remote_socket)
    {
        $remote_socket = $this->proxy;
    }
    /**
     * Alter remote path before getting stream data
     *
     * @since 1.6
     * @param string $path Path to send in HTTP request string ("GET ...")
     * @param string $url Full URL we're requesting
     */
    public function fsockopen_remote_host_path(&$path, $url)
    {
        $path = $url;
    }
    /**
     * Add extra headers to the request before sending
     *
     * @since 1.6
     * @param string $out HTTP header string
     */
    public function fsockopen_header(&$out)
    {
        $out .= \sprintf("Proxy-Authorization: Basic %s\r\n", \base64_encode($this->get_auth_string()));
    }
    /**
     * Get the authentication string (user:pass)
     *
     * @since 1.6
     * @return string
     */
    public function get_auth_string()
    {
        return $this->user . ':' . $this->pass;
    }
}
