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php-phpbb/phpBB/includes/functions_download.php

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[ticket/9792] Move function definitions out of download/file.php Move functions defined in download/file.php out to includes/functions_download.php so they can be properly reused and unit tested. PHPBB3-9792
2010-08-26 22:31:08 +02:00
<?php
/**
*
* @package phpBB3
* @copyright (c) 2005 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
/**
* A simplified function to deliver avatars
* The argument needs to be checked before calling this function.
*/
function send_avatar_to_browser($file, $browser)
{
global $config, $phpbb_root_path;
$prefix = $config['avatar_salt'] . '_';
$image_dir = $config['avatar_path'];
// Adjust image_dir path (no trailing slash)
if (substr($image_dir, -1, 1) == '/' || substr($image_dir, -1, 1) == '\\')
{
$image_dir = substr($image_dir, 0, -1) . '/';
}
$image_dir = str_replace(array('../', '..\\', './', '.\\'), '', $image_dir);
if ($image_dir && ($image_dir[0] == '/' || $image_dir[0] == '\\'))
{
$image_dir = '';
}
$file_path = $phpbb_root_path . $image_dir . '/' . $prefix . $file;
if ((@file_exists($file_path) && @is_readable($file_path)) && !headers_sent())
{
header('Pragma: public');
$image_data = @getimagesize($file_path);
header('Content-Type: ' . image_type_to_mime_type($image_data[2]));
if (strpos(strtolower($browser), 'msie') !== false && strpos(strtolower($browser), 'msie 8.0') === false)
{
header('Content-Disposition: attachment; ' . header_filename($file));
if (strpos(strtolower($browser), 'msie 6.0') !== false)
{
header('Expires: -1');
}
else
{
header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
}
}
else
{
header('Content-Disposition: inline; ' . header_filename($file));
header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
}
$size = @filesize($file_path);
if ($size)
{
header("Content-Length: $size");
}
if (@readfile($file_path) == false)
{
$fp = @fopen($file_path, 'rb');
if ($fp !== false)
{
while (!feof($fp))
{
echo fread($fp, 8192);
}
fclose($fp);
}
}
flush();
}
else
{
header('HTTP/1.0 404 Not Found');
}
}
/**
* Wraps an url into a simple html page. Used to display attachments in IE.
* this is a workaround for now; might be moved to template system later
* direct any complaints to 1 Microsoft Way, Redmond
*/
function wrap_img_in_html($src, $title)
{
echo '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-Strict.dtd">';
echo '<html>';
echo '<head>';
echo '<meta http-equiv="content-type" content="text/html; charset=UTF-8" />';
echo '<title>' . $title . '</title>';
echo '</head>';
echo '<body>';
echo '<div>';
echo '<img src="' . $src . '" alt="' . $title . '" />';
echo '</div>';
echo '</body>';
echo '</html>';
}
/**
* Send file to browser
*/
function send_file_to_browser($attachment, $upload_dir, $category)
{
global $user, $db, $config, $phpbb_root_path;
$filename = $phpbb_root_path . $upload_dir . '/' . $attachment['physical_filename'];
if (!@file_exists($filename))
{
trigger_error($user->lang['ERROR_NO_ATTACHMENT'] . '<br /><br />' . sprintf($user->lang['FILE_NOT_FOUND_404'], $filename));
}
// Correct the mime type - we force application/octetstream for all files, except images
// Please do not change this, it is a security precaution
if ($category != ATTACHMENT_CATEGORY_IMAGE || strpos($attachment['mimetype'], 'image') !== 0)
{
$attachment['mimetype'] = (strpos(strtolower($user->browser), 'msie') !== false || strpos(strtolower($user->browser), 'opera') !== false) ? 'application/octetstream' : 'application/octet-stream';
}
if (@ob_get_length())
{
@ob_end_clean();
}
// Now send the File Contents to the Browser
$size = @filesize($filename);
// To correctly display further errors we need to make sure we are using the correct headers for both (unsetting content-length may not work)
// Check if headers already sent or not able to get the file contents.
if (headers_sent() || !@file_exists($filename) || !@is_readable($filename))
{
// PHP track_errors setting On?
if (!empty($php_errormsg))
{
trigger_error($user->lang['UNABLE_TO_DELIVER_FILE'] . '<br />' . sprintf($user->lang['TRACKED_PHP_ERROR'], $php_errormsg));
}
trigger_error('UNABLE_TO_DELIVER_FILE');
}
[ticket/9627] Make sure the database record for the filesize is correct. PHPBB3-9627
2010-06-23 15:38:24 +02:00
// Make sure the database record for the filesize is correct
if ($size > 0 && $size != $attachment['filesize'])
{
// Update database record
$sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
SET filesize = ' . (int) $size . '
WHERE attach_id = ' . (int) $attachment['attach_id'];
$db->sql_query($sql);
}
[ticket/9792] Move function definitions out of download/file.php Move functions defined in download/file.php out to includes/functions_download.php so they can be properly reused and unit tested. PHPBB3-9792
2010-08-26 22:31:08 +02:00
// Now the tricky part... let's dance
header('Pragma: public');
/**
* Commented out X-Sendfile support. To not expose the physical filename within the header if xsendfile is absent we need to look into methods of checking it's status.
*
* Try X-Sendfile since it is much more server friendly - only works if the path is *not* outside of the root path...
* lighttpd has core support for it. An apache2 module is available at http://celebnamer.celebworld.ws/stuff/mod_xsendfile/
*
* Not really ideal, but should work fine...
* <code>
* if (strpos($upload_dir, '/') !== 0 && strpos($upload_dir, '../') === false)
* {
* header('X-Sendfile: ' . $filename);
* }
* </code>
*/
// Send out the Headers. Do not set Content-Disposition to inline please, it is a security measure for users using the Internet Explorer.
$is_ie8 = (strpos(strtolower($user->browser), 'msie 8.0') !== false);
header('Content-Type: ' . $attachment['mimetype']);
if ($is_ie8)
{
header('X-Content-Type-Options: nosniff');
}
if ($category == ATTACHMENT_CATEGORY_FLASH && request_var('view', 0) === 1)
{
// We use content-disposition: inline for flash files and view=1 to let it correctly play with flash player 10 - any other disposition will fail to play inline
header('Content-Disposition: inline');
}
else
{
if (empty($user->browser) || (!$is_ie8 && (strpos(strtolower($user->browser), 'msie') !== false)))
{
header('Content-Disposition: attachment; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie 6.0') !== false))
{
header('expires: -1');
}
}
else
{
header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
if ($is_ie8 && (strpos($attachment['mimetype'], 'image') !== 0))
{
header('X-Download-Options: noopen');
}
}
}
if ($size)
{
header("Content-Length: $size");
}
// Close the db connection before sending the file
$db->sql_close();
if (!set_modified_headers($attachment['filetime'], $user->browser))
{
// Try to deliver in chunks
@set_time_limit(0);
$fp = @fopen($filename, 'rb');
if ($fp !== false)
{
[ticket/9627] Support for HTTP range requests in download/file.php Initial draft of "resume support" for attachments. This should allow users to resume partially downloaded attachments. PHPBB3-9627
2010-05-31 13:20:15 +02:00
// Deliver file partially if requested
if ($range = http_byte_range($size))
{
fseek($fp, $range['byte_pos_start']);
send_status_line(206, 'Partial Content');
header('Content-Range: bytes ' . $range['byte_pos_start'] . '-' . $range['byte_pos_end'] . '/' . $range['bytes_total']);
header('Content-Length: ' . $range['bytes_requested']);
}
[ticket/9792] Move function definitions out of download/file.php Move functions defined in download/file.php out to includes/functions_download.php so they can be properly reused and unit tested. PHPBB3-9792
2010-08-26 22:31:08 +02:00
while (!feof($fp))
{
echo fread($fp, 8192);
}
fclose($fp);
}
else
{
@readfile($filename);
}
flush();
}
file_gc();
}
/**
* Get a browser friendly UTF-8 encoded filename
*/
function header_filename($file)
{
$user_agent = (!empty($_SERVER['HTTP_USER_AGENT'])) ? htmlspecialchars((string) $_SERVER['HTTP_USER_AGENT']) : '';
// There be dragons here.
// Not many follows the RFC...
if (strpos($user_agent, 'MSIE') !== false || strpos($user_agent, 'Safari') !== false || strpos($user_agent, 'Konqueror') !== false)
{
return "filename=" . rawurlencode($file);
}
// follow the RFC for extended filename for the rest
return "filename*=UTF-8''" . rawurlencode($file);
}
/**
* Check if downloading item is allowed
*/
function download_allowed()
{
global $config, $user, $db;
if (!$config['secure_downloads'])
{
return true;
}
$url = (!empty($_SERVER['HTTP_REFERER'])) ? trim($_SERVER['HTTP_REFERER']) : trim(getenv('HTTP_REFERER'));
if (!$url)
{
return ($config['secure_allow_empty_referer']) ? true : false;
}
// Split URL into domain and script part
$url = @parse_url($url);
if ($url === false)
{
return ($config['secure_allow_empty_referer']) ? true : false;
}
$hostname = $url['host'];
unset($url);
$allowed = ($config['secure_allow_deny']) ? false : true;
$iplist = array();
if (($ip_ary = @gethostbynamel($hostname)) !== false)
{
foreach ($ip_ary as $ip)
{
if ($ip)
{
$iplist[] = $ip;
}
}
}
// Check for own server...
$server_name = $user->host;
// Forcing server vars is the only way to specify/override the protocol
if ($config['force_server_vars'] || !$server_name)
{
$server_name = $config['server_name'];
}
if (preg_match('#^.*?' . preg_quote($server_name, '#') . '.*?$#i', $hostname))
{
$allowed = true;
}
// Get IP's and Hostnames
if (!$allowed)
{
$sql = 'SELECT site_ip, site_hostname, ip_exclude
FROM ' . SITELIST_TABLE;
$result = $db->sql_query($sql);
while ($row = $db->sql_fetchrow($result))
{
$site_ip = trim($row['site_ip']);
$site_hostname = trim($row['site_hostname']);
if ($site_ip)
{
foreach ($iplist as $ip)
{
if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_ip, '#')) . '$#i', $ip))
{
if ($row['ip_exclude'])
{
$allowed = ($config['secure_allow_deny']) ? false : true;
break 2;
}
else
{
$allowed = ($config['secure_allow_deny']) ? true : false;
}
}
}
}
if ($site_hostname)
{
if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_hostname, '#')) . '$#i', $hostname))
{
if ($row['ip_exclude'])
{
$allowed = ($config['secure_allow_deny']) ? false : true;
break;
}
else
{
$allowed = ($config['secure_allow_deny']) ? true : false;
}
}
}
}
$db->sql_freeresult($result);
}
return $allowed;
}
/**
* Check if the browser has the file already and set the appropriate headers-
* @returns false if a resend is in order.
*/
function set_modified_headers($stamp, $browser)
{
// let's see if we have to send the file at all
$last_load = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? strtotime(trim($_SERVER['HTTP_IF_MODIFIED_SINCE'])) : false;
if ((strpos(strtolower($browser), 'msie 6.0') === false) && (strpos(strtolower($browser), 'msie 8.0') === false))
{
if ($last_load !== false && $last_load >= $stamp)
{
send_status_line(304, 'Not Modified');
// seems that we need those too ... browsers
header('Pragma: public');
header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
return true;
}
else
{
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $stamp) . ' GMT');
}
}
return false;
}
function file_gc()
{
global $cache, $db;
if (!empty($cache))
{
$cache->unload();
}
$db->sql_close();
exit;
}
[ticket/9627] Support for HTTP range requests in download/file.php Initial draft of "resume support" for attachments. This should allow users to resume partially downloaded attachments. PHPBB3-9627
2010-05-31 13:20:15 +02:00
/**
* HTTP range support (RFC 2616 Section 14.35)
*
* Allows browsers to request partial file content
* in case a download has been interrupted.
*
* A range request can contain multiple ranges,
* we however only handle the first request and
* only support requests from a given byte to the end of the file.
*
* @param int $filesize the size of the file in bytes we are about to deliver
*
* @return mixed false if the whole file has to be delivered
* associative array on success
*
* @author bantu
*/
function http_byte_range($filesize)
{
if (!$filesize)
{
return false;
}
foreach (array($_SERVER, $_ENV) as $global)
{
if (isset($global['HTTP_RANGE']))
{
$http_range = $global['HTTP_RANGE'];
break;
}
}
// Return if no range requested
// Make sure range request starts with "bytes="
if (empty($http_range) || strpos($http_range, 'bytes=') !== 0)
{
return false;
}
// Strip leading 'bytes='
// Multiple ranges can be separated by a comma
foreach (explode(',', substr($http_range, 6)) as $range_string)
{
$range = explode('-', trim($range_string));
// "-" is invalid, "0-0" however is valid and means the very first byte.
if (sizeof($range) != 2 || $range[0] === '' && $range[1] === '')
{
continue;
}
if ($range[0] === '')
{
// Return last $range[1] bytes.
if (!$range[1])
{
continue;
}
if ($range[1] >= $filesize)
{
return false;
}
$first_byte_pos = $filesize - (int) $range[1];
$last_byte_pos = $filesize - 1;
}
else
{
// Return bytes from $range[0] to $range[1]
$first_byte_pos = (int) $range[0];
$last_byte_pos = (int) $range[1];
if ($last_byte_pos && $last_byte_pos < $first_byte_pos)
{
// The requested range contains 0 bytes.
continue;
}
if ($first_byte_pos >= $filesize)
{
// Requested range not satisfiable
return false;
}
// Adjust last-byte-pos if it is absent or greater than the content.
if ($range[1] === '' || $last_byte_pos >= $filesize)
{
$last_byte_pos = $filesize - 1;
}
}
return array(
'byte_pos_start' => $first_byte_pos,
'byte_pos_end' => $last_byte_pos,
'bytes_requested' => $last_byte_pos - $first_byte_pos + 1,
'bytes_total' => $filesize,
);
}
}
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