forked from danielduan/HerokuGlypeProxy
/
browse.php
executable file
·1674 lines (1173 loc) · 48.9 KB
/
browse.php
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<?php
/*******************************************************************
* Glype is copyright and trademark 2007-2016 UpsideOut, Inc. d/b/a Glype
* and/or its licensors, successors and assigners. All rights reserved.
*
* Use of Glype is subject to the terms of the Software License Agreement.
* http://www.glype.com/license.php
*******************************************************************
* This file is the main component of the glype proxy application.
* It decodes values contained within the current URI to determine a
* resource to download and pass onto the user.
******************************************************************/
/*****************************************************************
* Initialise
******************************************************************/
require 'includes/init.php';
if (count($adminDetails)===0) {
header("HTTP/1.1 302 Found"); header("Location: admin.php"); exit;
}
# Debug mode - stores extra information in the cURL wrapper object and prints it
# out. It produces an ugly mess but still a quick tool for debugging.
define('DEBUG_MODE', 0);
define('CURL_LOG', 0);
# Log cURLs activity to file
# Change filename below if desired. Ensure file exists and is writable.
if ( CURL_LOG && ( $fh = @fopen('curl.txt', 'w')) ) {
$toSet[CURLOPT_STDERR] = $fh;
$toSet[CURLOPT_VERBOSE] = true;
}
/*****************************************************************
* PHP sends some headers by default. Stop them.
******************************************************************/
# Clear the default mime-type
header('Content-Type:');
# And remove the caching headers
header('Cache-Control:');
header('Last-Modified:');
/*****************************************************************
* Find URI of resource to load
* Flag and bitfield already extracted in /includes/init.php
******************************************************************/
switch ( true ) {
# Try query string for URL
case ! empty($_GET['u']) && ( $toLoad = deproxyURL($_GET['u'], true) ):
break;
# Try path info
case ! empty($_SERVER['PATH_INFO']) && ( $toLoad = deproxyURL($_SERVER['PATH_INFO'], true) ):
break;
# Found no valid URL, return to index
default:
redirect();
}
# Validate the URL
if ( ! preg_match('#^((https?)://(?:([a-z0-9-.]+:[a-z0-9-.]+)@)?([a-z0-9-.]+)(?::([0-9]+))?)(?:/|$)((?:[^?/]*/)*)([^?]*)(?:\?([^\#]*))?(?:\#.*)?$#i', $toLoad, $tmp) ) {
# Invalid, show error
error('invalid_url', htmlentities($toLoad));
}
# Rename parts to more useful names
$URL = array(
'scheme_host' => $tmp[1],
'scheme' => $tmp[2],
'auth' => $tmp[3],
'host' => strtolower($tmp[4]),
'domain' => strtolower(preg_match('#(?:^|\.)([a-z0-9-]+\.(?:[a-z.]{5,6}|[a-z]{2,}))$#', $tmp[4], $domain) ? $domain[1] : $tmp[4]), # Attempt to split off the subdomain (if any)
'port' => $tmp[5],
'path' => '/' . $tmp[6],
'filename' => $tmp[7],
'extension' => pathinfo($tmp[7], PATHINFO_EXTENSION),
'query' => isset($tmp[8]) ? $tmp[8] : ''
);
# Apply encoding on full URL. In theory all parts of the URL need various special
# characters encoding but this needs to be done by the author of the webpage.
# We can make a guess at what needs encoding but some servers will complain when
# receiving the encoded character instead of unencoded and vice versa. We want
# to edit the URL as little as possible so we're only encoding spaces, as this
# seems to 'fix' the majority of cases.
$URL['href'] = str_replace(' ', '%20', $toLoad);
# Add any supplied authentication information to our auth array
if ($URL['auth']) {
$_SESSION['authenticate'][$URL['scheme_host']] = $URL['auth'];
}
/*****************************************************************
* Protect LAN from access through proxy
* This does not stop all hostnames that resolve to LAN IPs
* unless the line containing "gethostbyname" is uncommented below
******************************************************************/
if (preg_match('#^localhost#i', $URL['host'])) {
error('banned_site', $URL['host']);
}
$host = $URL['host'];
#$host = gethostbyname($host); # uncomment for more complete protection
if (preg_match('#^\d+$#', $host)) { # decimal IPs
$host = implode('.', array($host>>24&255, $host>>16&255, $host>>8&255, $host&255));
}
if (preg_match('#^(0|10|127|169\.254|192\.168|172\.(?:1[6-9]|2[0-9]|3[01])|2[2-5][0-9])\.#', $host)) { # special use netblocks
error('banned_site', $host);
}
/*****************************************************************
* Protect us from hotlinking
******************************************************************/
# Protect only if option is enabled and we don't have a verified session
if ( $CONFIG['stop_hotlinking'] && empty($_SESSION['no_hotlink']) ) {
# Assume hotlinking to start with, then check against allowed domains
$tmp = true;
# Ensure we have valid referrer information to check
if ( ! empty($_SERVER['HTTP_REFERER']) && strpos($_SERVER['HTTP_REFERER'], 'http') === 0 ) {
# Examine all the allowed domains (including our current domain)
foreach ( array_merge( (array) GLYPE_URL, $CONFIG['hotlink_domains'] ) as $domain ) {
# Do a case-insensitive comparison
if ( stripos($_SERVER['HTTP_REFERER'], $domain) !== false ) {
# This referrer is OK
$tmp = false;
break;
}
}
}
# Redirect to index if this is still identified as hotlinking
if ( $tmp ) {
error('no_hotlink');
}
}
# If we're still here, the referrer must be OK so set the session for next time
$_SESSION['no_hotlink'] = true;
/*****************************************************************
* Are we allowed to visit this site? Check whitelist/blacklist
******************************************************************/
# Whitelist - deny IF NOT on list
if ( ! empty($CONFIG['whitelist']) ) {
$tmp = false;
# Loop through
foreach ( $CONFIG['whitelist'] as $domain ) {
# Check for match
if ( strpos($URL['host'], $domain) !== false ) {
# Must be a permitted site
$tmp = true;
}
}
# Unless $tmp is flagged true, this is an illegal site
if ( ! $tmp ) {
error('banned_site', $URL['host']);
}
}
# Blacklist
if ( ! empty($CONFIG['blacklist']) ) {
# Loop through
foreach ( $CONFIG['blacklist'] as $domain ) {
# Check for match
if ( strpos($URL['host'], $domain) !== false ) {
# If matched, site is banned
error('banned_site', $URL['host']);
}
}
}
/*****************************************************************
* Show SSL warning
* This warns users if they access a secure site when the proxy is NOT
* on a secure connection and the $CONFIG['ssl_warning'] option is on.
******************************************************************/
if ( $URL['scheme'] == 'https' && $CONFIG['ssl_warning'] && empty($_SESSION['ssl_warned']) && ! HTTPS ) {
# Remember this page so we can return after agreeing to the warning
$_SESSION['return'] = currentURL();
# Don't cache the warning page
sendNoCache();
# Show the page
echo loadTemplate('sslwarning.page');
# All done!
exit;
}
/*****************************************************************
* Plugins
* Load any site-specific plugin.
******************************************************************/
global $foundPlugin;
$plugins = explode(',', $CONFIG['plugins']);
if ($foundPlugin = in_array($URL['domain'], $plugins)) {
include(GLYPE_ROOT.'/plugins/'.$URL['domain'].'.php');
}
/*****************************************************************
* Close session to allow simultaneous transfers
* PHP automatically prevents multiple instances of the script running
* simultaneously to avoid concurrency issues with the session.
* This may be beneficial on high traffic servers but we have the option
* to close the session and thus allow simultaneous transfers.
******************************************************************/
if ( ! $CONFIG['queue_transfers'] ) {
session_write_close();
}
/*****************************************************************
* Check load limit. This is done now rather than earlier so we
* don't stop serving the (relatively) cheap cached files.
******************************************************************/
if (
# Option enabled
$CONFIG['load_limit']
# Ignore inline elements - when borderline on the server load, if the HTML
# page downloads fine but the inline images, css and js are blocked, the user
# may get very frustrated very quickly without knowing about the load issues.
&& ! in_array($URL['extension'], array('jpg','jpeg','png','gif','css','js','ico'))
) {
# Do we need to find the load and regenerate the temp cache file?
# Try to fetch the load from the temp file (~30 times faster than
# shell_exec()) and ensure the value is accurate and not outdated,
if( ! file_exists($file = $CONFIG['tmp_dir'] . 'load.php') || ! (include $file) || ! isset($load, $lastChecked) || $lastChecked < $_SERVER['REQUEST_TIME']-60 ) {
$load = (float) 0;
# Attempt to fetch the load
if ( ($uptime = @shell_exec('uptime')) && preg_match('#load average: ([0-9.]+),#', $uptime, $tmp) ) {
$load = (float) $tmp[1];
# And regenerate the file
file_put_contents($file, '<?php $load = ' . $load . '; $lastChecked = ' . $_SERVER['REQUEST_TIME'] . ';');
}
}
# Load found, (or at least, should be), check against max permitted
if ( $load > $CONFIG['load_limit'] ) {
error('server_busy'); # Show error
}
}
/*****************************************************************
* * * * * * * * * * Prepare the REQUEST * * * * * * * * * * * *
******************************************************************/
/*****************************************************************
* Set cURL transfer options
* These options are merely passed to cURL and our script has no further
* impact or dependence of them. See the libcurl documentation and
* http://php.net/curl_setopt for more details.
*
* The following options are required for the proxy to function or
* inherit values from our config. In short: they shouldn't need changing.
******************************************************************/
# Time to wait for connection
$toSet[CURLOPT_CONNECTTIMEOUT] = $CONFIG['connection_timeout'];
# Time to allow for entire transfer
$toSet[CURLOPT_TIMEOUT] = $CONFIG['transfer_timeout'];
# Show SSL without verifying - we almost definitely don't have an up to date CA cert
# bundle so we can't verify the certificate. See http://curl.haxx.se/docs/sslcerts.html
$toSet[CURLOPT_SSL_VERIFYPEER] = false;
$toSet[CURLOPT_SSL_VERIFYHOST] = false;
# Send an empty Expect header (avoids 100 responses)
$toSet[CURLOPT_HTTPHEADER][] = 'Expect:';
# Use IPv4 for DNS resolution
if (defined('CURLOPT_IPRESOLVE') && defined('CURL_IPRESOLVE_V4')) {
$toSet[CURLOPT_IPRESOLVE][] = 'CURL_IPRESOLVE_V4';
}
# Can we use "If-Modified-Since" to save a transfer? Server can return 304 Not Modified
if ( isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ) {
# How to treat the time condition : if un/modified since
$toSet[CURLOPT_TIMECONDITION] = CURL_TIMECOND_IFMODSINCE;
# The time value. Requires a timestamp so we can't just forward it raw
$toSet[CURLOPT_TIMEVALUE] = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
}
# Resume a transfer?
if ( $CONFIG['resume_transfers'] && isset($_SERVER['HTTP_RANGE']) ) {
# And give cURL the right part
$toSet[CURLOPT_RANGE] = substr($_SERVER['HTTP_RANGE'], 6);
}
# cURL has a max filesize option but it's not listed in the PHP manual so check it's available
if ( $CONFIG['max_filesize'] && defined('CURLOPT_MAXFILESIZE') ) {
# Use the cURL option - should be faster than our implementation
$toSet[CURLOPT_MAXFILESIZE] = $CONFIG['max_filesize'];
}
/*****************************************************************
* Performance options
* The values below are NOT the result of benchmarking tests. For
* optimum performance, you may want to try adjusting these values.
******************************************************************/
# DNS cache expiry time (seconds)
$toSet[CURLOPT_DNS_CACHE_TIMEOUT] = 600;
# Speed limits - aborts transfer if we're going too slowly
#$toSet[CURLOPT_LOW_SPEED_LIMIT] = 5; # speed limit in bytes per second
#$toSet[CURLOPT_LOW_SPEED_TIME] = 20; # seconds spent under the speed limit before aborting
# Number of max connections (no idea what this should be)
# $toSet[CURLOPT_MAXCONNECTS] = 100;
# Accept encoding in any format (allows compressed pages to be downloaded)
# Any bandwidth savings are likely to be minimal so better to save on load by
# downloading pages uncompressed. Use blank string for any compression or
# 'identity' to explicitly ask for uncompressed.
# $toSet[CURLOPT_ENCODING] = '';
# Undocumented in PHP manual (added 5.2.1) but allows uploads to some sites
# (e.g. imageshack) when without this option, an error occurs. Less efficient
# so probably best not to set this unless you need it.
# $toSet[CURLOPT_TCP_NODELAY] = true;
/*****************************************************************
* "Accept" headers
* No point sending back a file that the browser won't understand.
* Forward all the "Accept" headers. For each, check if it exists
* and if yes, add to the custom headers array.
* These may cause problems if the target server provides different
* content for the same URI based on these headers and we cache the response.
******************************************************************/
# Language (geotargeting will find the location of the server -
# forwarding this header can help avoid incorrect localisation)
if ( isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) ) {
$toSet[CURLOPT_HTTPHEADER][] = 'Accept-Language: ' . $_SERVER['HTTP_ACCEPT_LANGUAGE'];
}
# Accepted filetypes
if ( isset($_SERVER['HTTP_ACCEPT']) ) {
$toSet[CURLOPT_HTTPHEADER][] = 'Accept: ' . $_SERVER['HTTP_ACCEPT'];
}
# Accepted charsets
if ( isset($_SERVER['HTTP_ACCEPT_CHARSET']) ) {
$toSet[CURLOPT_HTTPHEADER][] = 'Accept-Charset: ' . $_SERVER['HTTP_ACCEPT_CHARSET'];
}
/*****************************************************************
* Browser options
* Allows customization of a "virtual" browser via /extras/edit-browser.php
******************************************************************/
# Send user agent
if ( $_SESSION['custom_browser']['user_agent'] ) {
$toSet[CURLOPT_USERAGENT] = $_SESSION['custom_browser']['user_agent'];
}
# Set referrer
if ( $_SESSION['custom_browser']['referrer'] == 'real' ) {
# Automatically determine referrer
if ( isset($_SERVER['HTTP_REFERER']) && $flag != 'norefer' && strpos($tmp = deproxyURL($_SERVER['HTTP_REFERER']), GLYPE_URL) === false ) {
$toSet[CURLOPT_REFERER] = $tmp;
}
} else if ( $_SESSION['custom_browser']['referrer'] ) {
# Send custom referrer
$toSet[CURLOPT_REFERER] = $_SESSION['custom_browser']['referrer'];
}
# Clear the norefer flag
if ( $flag == 'norefer' ) {
$flag = '';
}
/*****************************************************************
* Authentication
******************************************************************/
# Check for stored credentials for this site
if ( isset($_SESSION['authenticate'][$URL['scheme_host']]) ) {
# Found credentials so use them!
$toSet[CURLOPT_HTTPAUTH] = CURLAUTH_BASIC;
$toSet[CURLOPT_USERPWD] = $_SESSION['authenticate'][$URL['scheme_host']];
}
/*****************************************************************
* Cookies
* Find the relevant cookies for this request. All cookies get sent
* to the proxy, but we only want to forward the ones that were set
* for the current domain.
*
* Cookie storage methods:
* (1) Server-side - cookies stored server-side and handled
* (mostly) internally by cURL
* (2) Encoded - cookies forwarded to client but encoded
* (3) Normal - cookies forwarded without encoding
******************************************************************/
# Are cookies allowed?
if ( $options['allowCookies'] ) {
# Option (1): cookies stored server-side
if ( $CONFIG['cookies_on_server'] ) {
# Check cookie folder exists or try to create it
if ( $s = checkTmpDir($CONFIG['cookies_folder'], 'Deny from all') ) {
# Set cURL to use this as the cookie jar
$toSet[CURLOPT_COOKIEFILE] = $toSet[CURLOPT_COOKIEJAR] = $CONFIG['cookies_folder'] . glype_session_id();
}
} else if ( isset($_COOKIE[COOKIE_PREFIX]) ) {
# Encoded or unencoded?
if ( $CONFIG['encode_cookies'] ) {
# Option (2): encoded cookies stored client-side
foreach ( $_COOKIE[COOKIE_PREFIX] as $attributes => $value ) {
# Decode cookie to [domain,path,name]
$attributes = explode(' ', base64_decode($attributes));
# Check successful decoding and skip if failed
if ( ! isset($attributes[2]) ) {
continue;
}
# Extract parts
list($domain, $path, $name) = $attributes;
# Check for a domain match and skip if no match
if ( stripos($URL['host'], $domain) === false ) {
continue;
}
# Check for match and skip to next path if fail
if ( stripos($URL['path'], $path) !== 0 ) {
continue;
}
# Multiple cookies of the same name are permitted if different paths
# so use path AND name as the key in the temp array
$key = $path . $name;
# Check for existing cookie with same domain, same path and same name
if ( isset($toSend[$key]) && $toSend[$key]['path'] == $path && $toSend[$key]['domain'] > strlen($domain) ) {
# Conflicting cookies so ignore the one with the less complete tail match
# (i.e. the current one)
continue;
}
# Domain and path OK, decode cookie value
$value = base64_decode($value);
# Only send secure cookies on https connection - secure cookies marked by !SEC suffix
# so remove the suffix
$value = str_replace('!SEC', '', $value, $tmp);
# And if secure cookie but not https site, do not send
if ( $tmp && $URL['scheme'] != 'https' ) {
continue;
}
# Everything checked and verified, add to $toSend for further processing later
$toSend[$key] = array('path_size' => strlen($path), 'path' => $path, 'domain' => strlen($domain), 'send' => $name . '=' . $value);
}
} else {
# Option (3): unencoded cookies stored client-side
foreach ( $_COOKIE[COOKIE_PREFIX] as $domain => $paths ) {
# $domain holds the domain (surprisingly) and $path is an array
# of keys (paths) and more arrays (each child array of $path = one cookie)
# e.g. Array('domain.com' => Array('/' => Array('cookie_name' => 'value')))
# First check for domain match and skip to next domain if no match
if ( stripos($URL['host'], $domain) === false ) {
continue;
}
# If conflicting cookies with same name and same path,
# send the one with the more complete tail match. To do this we
# need to know how long each match is/was so record domain length.
$domainSize = strlen($domain);
# Now look at all the available paths
foreach ( $paths as $path => $cookies ) {
# Check for match and skip to next path if fail
if ( stripos($URL['path'], $path) !== 0 ) {
continue;
}
# In final header, cookies are ordered with most specific path
# matches first so include the length of match in temp array
$pathSize = strlen($path);
# All cookies in $cookies array should be sent
foreach ( $cookies as $name => $value ) {
# Multiple cookies of the same name are permitted if different paths
# so use path AND name as the key in the temp array
$key = $path . $name;
# Check for existing cookie with same domain, same path and same name
if ( isset($toSend[$key]) && $toSend[$key]['path'] == $path && $toSend[$key]['domain'] > $domainSize ) {
# Conflicting cookies so ignore the one with the less complete tail match
# (i.e. the current one)
continue;
}
# Only send secure cookies on https connection - secure cookies marked by !SEC suffix
# so remove the suffix
$value = str_replace('!SEC', '', $value, $tmp);
# And if secure cookie but not https site, do not send
if ( $tmp && $URL['scheme'] != 'https' ) {
continue;
}
# Add to $toSend for further processing later
$toSend[$key] = array('path_size' => $pathSize, 'path' => $path, 'domain' => $domainSize, 'send' => $name . '=' . $value);
}
}
}
}
# Ensure we have found cookies
if ( ! empty($toSend) ) {
# Order by path specificity (as per Netscape spec)
function compareArrays($a, $b) {
return ( $a['path_size'] > $b['path_size'] ) ? -1 : 1;
}
# Apply the sort to order by path_size descending
uasort($toSend, 'compareArrays');
# Go through the ordered array and generate the Cookie: header
$tmp = '';
foreach ( $toSend as $cookie ) {
$tmp .= $cookie['send'] . '; ';
}
# Give the string to cURL
$toSet[CURLOPT_COOKIE] = $tmp;
}
# And clear the toSend array
unset($toSend);
}
}
/*****************************************************************
* Post
* Forward the post data. Usually very simple but complicated by
* multipart forms because in those cases, the raw post is not available.
******************************************************************/
if ( ! empty($_POST) ) {
# enable backward compatibility with cURL's @ option for uploading files in PHP 5.5 and 5.6
if (version_compare(PHP_VERSION, '5.5')>=0) {
$toSet[CURLOPT_SAFE_UPLOAD] = false;
}
# Attempt to get raw POST from the input wrapper
if ( ! ($tmp = file_get_contents('php://input')) ) {
# Raw data not available (probably multipart/form-data).
# cURL will do a multipart post if we pass an array as the
# POSTFIELDS value but this array can only be one deep.
# Recursively flatten array to one level deep and rename keys
# as firstLayer[second][etc]. Also apply the input decode to all
# array keys.
function flattenArray($array, $prefix='') {
# Start with empty array
$stack = array();
# Loop through the array to flatten
foreach ( $array as $key => $value ) {
# Decode the input name
$key = inputDecode($key);
# Determine what the new key should be - add the current key to
# the prefix and surround in []
$newKey = $prefix ? $prefix . '[' . $key . ']' : $key;
if ( is_array($value) ) {
# If it's an array, recurse and merge the returned array
$stack = array_merge($stack, flattenArray($value, $newKey));
} else {
# Otherwise just add it to the current stack
$stack[$newKey] = clean($value);
}
}
# Return flattened
return $stack;
}
$tmp = flattenArray($_POST);
# Add any file uploads?
if ( ! empty($_FILES) ) {
# Loop through and add the files
foreach ( $_FILES as $name => $file ) {
# Is this an array?
if ( is_array($file['tmp_name']) ) {
# Flatten it - file arrays are in the slightly odd format of
# $_FILES['layer1']['tmp_name']['layer2']['layer3,etc.'] so add
# layer1 onto the start.
$flattened = flattenArray(array($name => $file['tmp_name']));
# And add all files to the post
foreach ( $flattened as $key => $value ) {
$tmp[$key] = '@' . $value;
}
} else {
# Not another array. Check if the file uploaded successfully?
if ( ! empty($file['error']) || empty($file['tmp_name']) ) {
continue;
}
# Add to array with @ - tells cURL to upload this file
$tmp[$name] = '@' . $file['tmp_name'];
}
# To do: rename the temp file to it's real name before
# uploading it to the target? Otherwise, the target receives
# the temp name instead of the original desired name
# but doing this may be a security risk.
}
}
}
# Convert back to GET if required
if ( isset($_POST['convertGET']) ) {
# Remove convertGET from POST array and update our location
$URL['href'] .= ( empty($URL['query']) ? '?' : '&' ) . str_replace('convertGET=1', '', $tmp);
} else {
# Genuine POST so set the cURL post value
$toSet[CURLOPT_POST] = 1;
$toSet[CURLOPT_POSTFIELDS] = $tmp;
}
}
/*****************************************************************
* Apply pre-request code from plugins
******************************************************************/
if ( $foundPlugin && function_exists('preRequest') ) {
preRequest();
}
/*****************************************************************
* Make the request
* This request object uses custom header/body reading functions
* so we can start processing responses on the fly - e.g. we don't
* need to wait till the whole file has downloaded before deciding
* if it needs parsing or can be sent out unchanged.
******************************************************************/
class Request {
# Response status code
public $status = 0;
# Headers received and read by our callback
public $headers = array();
# Returned data (if saved)
public $return;
# Reason for aborting transfer (or empty to continue downloading)
public $abort;
# The error (if any) returned by curl_error()
public $error;
# Type of resource downloaded [html, js, css] or empty if no parsing needed
public $parseType;
# Automatically detect(ed) content type?
public $sniff = false;
# Forward cookies or not
private $forwardCookies = false;
# Limit filesize?
private $limitFilesize = 0;
# Speed limit (bytes per second)
private $speedLimit = 0;
# URL array split into pieces
private $URL;
# = $options from the global scope
private $browsingOptions;
# Options to pass to cURL
private $curlOptions;
# Constructor - takes the parameters and saves them
public function __construct($curlOptions) {
global $options, $CONFIG;
# Set our reading callbacks
$curlOptions[CURLOPT_HEADERFUNCTION] = array(&$this, 'readHeader');
$curlOptions[CURLOPT_WRITEFUNCTION] = array(&$this, 'readBody');
# Determine whether or not to forward cookies
if ( $options['allowCookies'] && ! $CONFIG['cookies_on_server'] ) {
$this->forwardCookies = $CONFIG['encode_cookies'] ? 'encode' : 'normal';
}
# Determine a filesize limit
if ( $CONFIG['max_filesize'] ) {
$this->limitFilesize = $CONFIG['max_filesize'];
}
# Determine speed limit
if ( $CONFIG['download_speed_limit'] ) {
$this->speedLimit = $CONFIG['download_speed_limit'];
}
# Set options
$this->browsingOptions = $options;
$this->curlOptions = $curlOptions;
# Extend the PHP timeout
set_time_limit($CONFIG['transfer_timeout']);
# Record debug information
if ( DEBUG_MODE ) {
$this->cookiesSent = isset($curlOptions[CURLOPT_COOKIE]) ? $curlOptions[CURLOPT_COOKIE] : ( isset($curlOptions[CURLOPT_COOKIEFILE]) ? 'using cookie jar' : 'none');
$this->postSent = isset($curlOptions[CURLOPT_POSTFIELDS]) ? $curlOptions[CURLOPT_POSTFIELDS] : '';
}
}
# Make the request and return the downloaded file if parsing is needed
public function go($URL) {
# Save options
$this->URL = $URL;
# Get a cURL handle
$ch = curl_init($this->URL['href']);
# Set the options
curl_setopt_array($ch, $this->curlOptions);
# Make the request
curl_exec($ch);
# Save any errors (but not if we caused the error by aborting!)
if ( ! $this->abort ) {
$this->error = curl_error($ch);
}
# And close the curl handle
curl_close($ch);
# And return the document (will be empty if no parsing needed,
# because everything else is outputted immediately)
return $this->return;
}
/*****************************************************************
* * * * * * * * * * Manage the RESPONSE * * * * * * * * * * * *
******************************************************************/
/*****************************************************************
* Read headers - receives headers line by line (cURL callback)
******************************************************************/
public function readHeader($handle, $header) {
# Extract the status code (can occur more than once if 100 continue)
if ( $this->status == 0 || ( $this->status == 100 && ! strpos($header, ':') ) ) {
$this->status = substr($header, 9, 3);
}
# Attempt to extract header name and value
$parts = explode(':', $header, 2);
# Did it split successfully? (i.e. was there a ":" in the header?)
if ( isset($parts[1]) ) {
# Header names are case insensitive
$headerType = strtolower($parts[0]);
# And header values will have trailing newlines and prevailing spaces
$headerValue = trim($parts[1]);
# Set any cookies
if ( $headerType == 'set-cookie' && $this->forwardCookies ) {
$this->setCookie($headerValue);
}
# Everything else, store as associative array
$this->headers[$headerType] = $headerValue;
# Do we want to forward this header? First list the headers we want:
$toForward = array('last-modified',
'content-disposition',
'content-type',
'content-range',
'content-language',
'expires',
'cache-control',
'pragma');
# And check for a match before forwarding the header.
if ( in_array($headerType, $toForward) ) {
header($header);
}
} else {
# Either first header or last 'header' (more precisely, the 2 newlines
# that indicate end of headers)
# No ":", so save whole header. Also check for end of headers.
if ( ( $this->headers[] = trim($header) ) == false ) {
# Must be end of headers so process them before reading body
$this->processHeaders();
# And has that processing given us any reason to abort?
if ( $this->abort ) {
return -1;
}
}
}
# cURL needs us to return length of data read
return strlen($header);
}
/*****************************************************************
* Process headers after all received and before body is read
******************************************************************/
private function processHeaders() {
# Ensure we only run this function once
static $runOnce;
# Check for flag and if found, stop running function
if ( isset($runOnce) ) {
return;
}
# Set flag for next time
$runOnce = true;
# Send the appropriate status code
header(' ', true, $this->status);
# Find out if we want to abort the transfer
switch ( true ) {
# Redirection
case isset($this->headers['location']):
$this->abort = 'redirect';