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<?php
class UrlHelper {
static $fetch_last_error;
static $fetch_last_error_code;
static $fetch_last_error_content;
static $fetch_last_content_type;
static $fetch_last_modified;
static $fetch_effective_url;
static $fetch_effective_ip_addr;
static $fetch_curl_used;
static function build_url($parts) {
$tmp = $parts['scheme'] . "://" . $parts['host'];
if (isset($parts['path'])) $tmp .= $parts['path'];
if (isset($parts['query'])) $tmp .= '?' . $parts['query'];
if (isset($parts['fragment'])) $tmp .= '#' . $parts['fragment'];
return $tmp;
}
/**
* Converts a (possibly) relative URL to a absolute one.
*
* @param string $url Base URL (i.e. from where the document is)
* @param string $rel_url Possibly relative URL in the document
*
* @return string Absolute URL
*/
public static function rewrite_relative($url, $rel_url) {
$rel_parts = parse_url($rel_url);
if (!empty($rel_parts['host']) && !empty($rel_parts['scheme'])) {
return self::validate($rel_url);
} else if (strpos($rel_url, "//") === 0) {
# protocol-relative URL (rare but they exist)
return self::validate("https:" . $rel_url);
} else if (strpos($rel_url, "magnet:") === 0) {
# allow magnet links
return $rel_url;
} else {
$parts = parse_url($url);
$rel_parts['host'] = $parts['host'];
$rel_parts['scheme'] = $parts['scheme'];
if (isset($rel_parts['path'])) {
if (strpos($rel_parts['path'], '/') !== 0)
$rel_parts['path'] = '/' . $rel_parts['path'];
$rel_parts['path'] = str_replace("/./", "/", $rel_parts['path']);
$rel_parts['path'] = str_replace("//", "/", $rel_parts['path']);
}
return self::validate(self::build_url($rel_parts));
}
}
// extended filtering involves validation for safe ports and loopback
static function validate($url, $extended_filtering = false) {
$url = clean($url);
# fix protocol-relative URLs
if (strpos($url, "//") === 0)
$url = "https:" . $url;
$tokens = parse_url($url);
// this isn't really necessary because filter_var(... FILTER_VALIDATE_URL) requires host and scheme
// as per https://php.watch/versions/7.3/filter-var-flag-deprecation but it might save time
if (empty($tokens['host']))
return false;
if (!in_array(strtolower($tokens['scheme']), ['http', 'https']))
return false;
//convert IDNA hostname to punycode if possible
if (function_exists("idn_to_ascii")) {
if (mb_detect_encoding($tokens['host']) != 'ASCII') {
if (defined('IDNA_NONTRANSITIONAL_TO_ASCII') && defined('INTL_IDNA_VARIANT_UTS46')) {
$tokens['host'] = idn_to_ascii($tokens['host'], IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
} else {
$tokens['host'] = idn_to_ascii($tokens['host']);
}
}
}
// separate set of tokens with urlencoded 'path' because filter_var() rightfully fails on non-latin characters
// (used for validation only, we actually request the original URL, in case of urlencode breaking it)
$tokens_filter_var = $tokens;
if ($tokens['path'] ?? false) {
$tokens_filter_var['path'] = implode("/",
array_map("rawurlencode",
array_map("rawurldecode",
explode("/", $tokens['path']))));
}
$url = self::build_url($tokens);
$url_filter_var = self::build_url($tokens_filter_var);
if (filter_var($url_filter_var, FILTER_VALIDATE_URL) === false)
return false;
if ($extended_filtering) {
if (!in_array($tokens['port'] ?? '', [80, 443, '']))
return false;
if (strtolower($tokens['host']) == 'localhost' || $tokens['host'] == '::1' || strpos($tokens['host'], '127.') === 0)
return false;
}
return $url;
}
static function resolve_redirects($url, $timeout, $nest = 0) {
// too many redirects
if ($nest > 10)
return false;
if (version_compare(PHP_VERSION, '7.1.0', '>=')) {
$context_options = array(
'http' => array(
'header' => array(
'Connection: close'
),
'method' => 'HEAD',
'timeout' => $timeout,
'protocol_version'=> 1.1)
);
if (Config::get(Config::HTTP_PROXY)) {
$context_options['http']['request_fulluri'] = true;
$context_options['http']['proxy'] = Config::get(Config::HTTP_PROXY);
}
$context = stream_context_create($context_options);
$headers = get_headers($url, 0, $context);
} else {
$headers = get_headers($url, 0);
}
if (is_array($headers)) {
$headers = array_reverse($headers); // last one is the correct one
foreach($headers as $header) {
if (stripos($header, 'Location:') === 0) {
$url = self::rewrite_relative($url, trim(substr($header, strlen('Location:'))));
return self::resolve_redirects($url, $timeout, $nest + 1);
}
}
return $url;
}
// request failed?
return false;
}
// TODO: max_size currently only works for CURL transfers
// TODO: multiple-argument way is deprecated, first parameter is a hash now
public static function fetch($options /* previously: 0: $url , 1: $type = false, 2: $login = false, 3: $pass = false,
4: $post_query = false, 5: $timeout = false, 6: $timestamp = 0, 7: $useragent = false*/) {
self::$fetch_last_error = false;
self::$fetch_last_error_code = -1;
self::$fetch_last_error_content = "";
self::$fetch_last_content_type = "";
self::$fetch_curl_used = false;
self::$fetch_last_modified = "";
self::$fetch_effective_url = "";
self::$fetch_effective_ip_addr = "";
if (!is_array($options)) {
// falling back on compatibility shim
$option_names = [ "url", "type", "login", "pass", "post_query", "timeout", "last_modified", "useragent" ];
$tmp = [];
for ($i = 0; $i < func_num_args(); $i++) {
$tmp[$option_names[$i]] = func_get_arg($i);
}
$options = $tmp;
/*$options = array(
"url" => func_get_arg(0),
"type" => @func_get_arg(1),
"login" => @func_get_arg(2),
"pass" => @func_get_arg(3),
"post_query" => @func_get_arg(4),
"timeout" => @func_get_arg(5),
"timestamp" => @func_get_arg(6),
"useragent" => @func_get_arg(7)
); */
}
$url = $options["url"];
$type = isset($options["type"]) ? $options["type"] : false;
$login = isset($options["login"]) ? $options["login"] : false;
$pass = isset($options["pass"]) ? $options["pass"] : false;
$post_query = isset($options["post_query"]) ? $options["post_query"] : false;
$timeout = isset($options["timeout"]) ? $options["timeout"] : false;
$last_modified = isset($options["last_modified"]) ? $options["last_modified"] : "";
$useragent = isset($options["useragent"]) ? $options["useragent"] : false;
$followlocation = isset($options["followlocation"]) ? $options["followlocation"] : true;
$max_size = isset($options["max_size"]) ? $options["max_size"] : Config::get(Config::MAX_DOWNLOAD_FILE_SIZE); // in bytes
$http_accept = isset($options["http_accept"]) ? $options["http_accept"] : false;
$http_referrer = isset($options["http_referrer"]) ? $options["http_referrer"] : false;
$url = ltrim($url, ' ');
$url = str_replace(' ', '%20', $url);
$url = self::validate($url, true);
if (!$url) {
self::$fetch_last_error = "Requested URL failed extended validation.";
return false;
}
$url_host = parse_url($url, PHP_URL_HOST);
$ip_addr = gethostbyname($url_host);
if (!$ip_addr || strpos($ip_addr, "127.") === 0) {
self::$fetch_last_error = "URL hostname failed to resolve or resolved to a loopback address ($ip_addr)";
return false;
}
if (function_exists('curl_init') && !ini_get("open_basedir")) {
self::$fetch_curl_used = true;
$ch = curl_init($url);
if (!$ch) return false;
$curl_http_headers = [];
if ($last_modified && !$post_query)
array_push($curl_http_headers, "If-Modified-Since: $last_modified");
if ($http_accept)
array_push($curl_http_headers, "Accept: " . $http_accept);
if (count($curl_http_headers) > 0)
curl_setopt($ch, CURLOPT_HTTPHEADER, $curl_http_headers);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout ? $timeout : Config::get(Config::FILE_FETCH_CONNECT_TIMEOUT));
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout ? $timeout : Config::get(Config::FILE_FETCH_TIMEOUT));
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, !ini_get("open_basedir") && $followlocation);
curl_setopt($ch, CURLOPT_MAXREDIRS, 20);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_setopt($ch, CURLOPT_USERAGENT, $useragent ? $useragent :
SELF_USER_AGENT);
curl_setopt($ch, CURLOPT_ENCODING, "");
if ($http_referrer)
curl_setopt($ch, CURLOPT_REFERER, $http_referrer);
if ($max_size) {
curl_setopt($ch, CURLOPT_NOPROGRESS, false);
curl_setopt($ch, CURLOPT_BUFFERSIZE, 16384); // needed to get 5 arguments in progress function?
// holy shit closures in php
// download & upload are *expected* sizes respectively, could be zero
curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, function($curl_handle, $download_size, $downloaded, $upload_size, $uploaded) use( &$max_size) {
Debug::log("[curl progressfunction] $downloaded $max_size", Debug::$LOG_EXTENDED);
return ($downloaded > $max_size) ? 1 : 0; // if max size is set, abort when exceeding it
});
}
if (!ini_get("open_basedir")) {
curl_setopt($ch, CURLOPT_COOKIEJAR, "/dev/null");
}
if (Config::get(Config::HTTP_PROXY)) {
curl_setopt($ch, CURLOPT_PROXY, Config::get(Config::HTTP_PROXY));
}
if ($post_query) {
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_query);
}
if ($login && $pass)
curl_setopt($ch, CURLOPT_USERPWD, "$login:$pass");
$ret = @curl_exec($ch);
$headers_length = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
$headers = explode("\r\n", substr($ret, 0, $headers_length));
$contents = substr($ret, $headers_length);
foreach ($headers as $header) {
if (strstr($header, ": ") !== false) {
list ($key, $value) = explode(": ", $header);
if (strtolower($key) == "last-modified") {
self::$fetch_last_modified = $value;
}
}
if (substr(strtolower($header), 0, 7) == 'http/1.') {
self::$fetch_last_error_code = (int) substr($header, 9, 3);
self::$fetch_last_error = $header;
}
}
if (curl_errno($ch) === 23 || curl_errno($ch) === 61) {
curl_setopt($ch, CURLOPT_ENCODING, 'none');
$contents = @curl_exec($ch);
}
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
self::$fetch_last_content_type = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
self::$fetch_effective_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
if (!self::validate(self::$fetch_effective_url, true)) {
self::$fetch_last_error = "URL received after redirection failed extended validation.";
return false;
}
self::$fetch_effective_ip_addr = gethostbyname(parse_url(self::$fetch_effective_url, PHP_URL_HOST));
if (!self::$fetch_effective_ip_addr || strpos(self::$fetch_effective_ip_addr, "127.") === 0) {
self::$fetch_last_error = "URL hostname received after redirection failed to resolve or resolved to a loopback address (".self::$fetch_effective_ip_addr.")";
return false;
}
self::$fetch_last_error_code = $http_code;
if ($http_code != 200 || $type && strpos(self::$fetch_last_content_type, "$type") === false) {
if (curl_errno($ch) != 0) {
self::$fetch_last_error .= "; " . curl_errno($ch) . " " . curl_error($ch);
}
self::$fetch_last_error_content = $contents;
curl_close($ch);
return false;
}
if (!$contents) {
self::$fetch_last_error = curl_errno($ch) . " " . curl_error($ch);
curl_close($ch);
return false;
}
curl_close($ch);
$is_gzipped = RSSUtils::is_gzipped($contents);
if ($is_gzipped && is_string($contents)) {
$tmp = @gzdecode($contents);
if ($tmp) $contents = $tmp;
}
return $contents;
} else {
self::$fetch_curl_used = false;
if ($login && $pass){
$url_parts = array();
preg_match("/(^[^:]*):\/\/(.*)/", $url, $url_parts);
$pass = urlencode($pass);
if ($url_parts[1] && $url_parts[2]) {
$url = $url_parts[1] . "://$login:$pass@" . $url_parts[2];
}
}
// TODO: should this support POST requests or not? idk
$context_options = array(
'http' => array(
'header' => array(
'Connection: close'
),
'method' => 'GET',
'ignore_errors' => true,
'timeout' => $timeout ? $timeout : Config::get(Config::FILE_FETCH_TIMEOUT),
'protocol_version'=> 1.1)
);
if (!$post_query && $last_modified)
array_push($context_options['http']['header'], "If-Modified-Since: $last_modified");
if ($http_accept)
array_push($context_options['http']['header'], "Accept: $http_accept");
if ($http_referrer)
array_push($context_options['http']['header'], "Referer: $http_referrer");
if (Config::get(Config::HTTP_PROXY)) {
$context_options['http']['request_fulluri'] = true;
$context_options['http']['proxy'] = Config::get(Config::HTTP_PROXY);
}
$context = stream_context_create($context_options);
$old_error = error_get_last();
self::$fetch_effective_url = self::resolve_redirects($url, $timeout ? $timeout : Config::get(Config::FILE_FETCH_CONNECT_TIMEOUT));
if (!self::validate(self::$fetch_effective_url, true)) {
self::$fetch_last_error = "URL received after redirection failed extended validation.";
return false;
}
self::$fetch_effective_ip_addr = gethostbyname(parse_url(self::$fetch_effective_url, PHP_URL_HOST));
if (!self::$fetch_effective_ip_addr || strpos(self::$fetch_effective_ip_addr, "127.") === 0) {
self::$fetch_last_error = "URL hostname received after redirection failed to resolve or resolved to a loopback address (".self::$fetch_effective_ip_addr.")";
return false;
}
$data = @file_get_contents($url, false, $context);
foreach ($http_response_header as $header) {
if (strstr($header, ": ") !== false) {
list ($key, $value) = explode(": ", $header);
$key = strtolower($key);
if ($key == 'content-type') {
self::$fetch_last_content_type = $value;
// don't abort here b/c there might be more than one
// e.g. if we were being redirected -- last one is the right one
} else if ($key == 'last-modified') {
self::$fetch_last_modified = $value;
} else if ($key == 'location') {
self::$fetch_effective_url = $value;
}
}
if (substr(strtolower($header), 0, 7) == 'http/1.') {
self::$fetch_last_error_code = (int) substr($header, 9, 3);
self::$fetch_last_error = $header;
}
}
if (self::$fetch_last_error_code != 200) {
$error = error_get_last();
if ($error['message'] != $old_error['message']) {
self::$fetch_last_error .= "; " . $error["message"];
}
self::$fetch_last_error_content = $data;
return false;
}
$is_gzipped = RSSUtils::is_gzipped($data);
if ($is_gzipped && $data) {
$tmp = @gzdecode($data);
if ($tmp) $data = $tmp;
}
return $data;
}
}
}