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1<?php
2/**
3*
4* This file is part of the phpBB Forum Software package.
5*
6* @copyright (c) phpBB Limited <https://www.phpbb.com>
7* @license GNU General Public License, version 2 (GPL-2.0)
8*
9* For full copyright and license information, please see
10* the docs/CREDITS.txt file.
11*
12*/
13
14namespace phpbb;
15
16class file_downloader
17{
18    /** @var string Error string */
19    protected $error_string = '';
20
21    /** @var int Error number */
22    protected $error_number = 0;
23
24    /**
25     * Retrieve contents from remotely stored file
26     *
27     * @param string    $host            File host
28     * @param string    $directory        Directory file is in
29     * @param string    $filename        Filename of file to retrieve
30     * @param int        $port            Port to connect to; default: 80
31     * @param int        $timeout        Connection timeout in seconds; default: 6
32     *
33     * @return false|string File data as string if file can be read and there is no
34     *            timeout, false if there were errors or the connection timed out
35     *
36     * @throws \phpbb\exception\runtime_exception If data can't be retrieved and no error
37     *        message is returned
38     */
39    public function get($host, $directory, $filename, $port = 80, $timeout = 6)
40    {
41        // Set default values for error variables
42        $this->error_number = 0;
43        $this->error_string = '';
44
45        if (function_exists('fsockopen') &&
46            $socket = @fsockopen(($port == 443 ? 'ssl://' : '') . $host, $port, $this->error_number, $this->error_string, $timeout)
47        )
48        {
49            @fputs($socket, "GET $directory/$filename HTTP/1.0\r\n");
50            @fputs($socket, "HOST: $host\r\n");
51            @fputs($socket, "Connection: close\r\n\r\n");
52
53            $timer_stop = time() + $timeout;
54            stream_set_timeout($socket, $timeout);
55
56            $file_info = '';
57            $get_info = false;
58
59            while (!@feof($socket))
60            {
61                if ($get_info)
62                {
63                    $file_info .= @fread($socket, 1024);
64                }
65                else
66                {
67                    $line = @fgets($socket, 1024);
68                    if ($line == "\r\n")
69                    {
70                        $get_info = true;
71                    }
72                    else if (stripos($line, '404 not found') !== false)
73                    {
74                        throw new \phpbb\exception\runtime_exception('FILE_NOT_FOUND', array($filename));
75                    }
76                }
77
78                $stream_meta_data = stream_get_meta_data($socket);
79
80                if ($stream_meta_data['timed_out'] || time() >= $timer_stop)
81                {
82                    throw new \phpbb\exception\runtime_exception('FSOCK_TIMEOUT');
83                }
84            }
85            @fclose($socket);
86        }
87        else
88        {
89            if ($this->error_string)
90            {
91                $this->error_string = utf8_convert_message($this->error_string);
92                return false;
93            }
94            else
95            {
96                throw new \phpbb\exception\runtime_exception('FSOCK_DISABLED');
97            }
98        }
99
100        return $file_info;
101    }
102
103    /**
104     * Get error string
105     *
106     * @return string Error string
107     */
108    public function get_error_string()
109    {
110        return $this->error_string;
111    }
112
113    /**
114     * Get error number
115     *
116     * @return int Error number
117     */
118    public function get_error_number()
119    {
120        return $this->error_number;
121    }
122}