610 lines
19 KiB
PHP
610 lines
19 KiB
PHP
<?php
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class UrlHelper {
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const EXTRA_HREF_SCHEMES = [
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"magnet",
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"mailto",
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"tel"
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];
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const EXTRA_SCHEMES_BY_CONTENT_TYPE = [
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"application/x-bittorrent" => [ "magnet" ],
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];
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static string $fetch_last_error;
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static int $fetch_last_error_code;
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static string $fetch_last_error_content;
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static string $fetch_last_content_type;
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static string $fetch_last_modified;
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static string $fetch_effective_url;
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static string $fetch_effective_ip_addr;
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static bool $fetch_curl_used;
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/**
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* @param array<string, string|int> $parts
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*/
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static function build_url(array $parts): string {
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$tmp = $parts['scheme'] . "://" . $parts['host'];
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if (isset($parts['path'])) $tmp .= $parts['path'];
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if (isset($parts['query'])) $tmp .= '?' . $parts['query'];
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if (isset($parts['fragment'])) $tmp .= '#' . $parts['fragment'];
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return $tmp;
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}
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/**
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* Converts a (possibly) relative URL to a absolute one, using provided base URL.
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* Provides some exceptions for additional schemes like data: if called with owning element/attribute.
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*
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* @param string $base_url Base URL (i.e. from where the document is)
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* @param string $rel_url Possibly relative URL in the document
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* @param string $owner_element Owner element tag name (i.e. "a") (optional)
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* @param string $owner_attribute Owner attribute (i.e. "href") (optional)
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* @param string $content_type URL content type as specified by enclosures, etc.
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*
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* @return false|string Absolute URL or false on failure (either during URL parsing or validation)
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*/
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public static function rewrite_relative($base_url,
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$rel_url,
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string $owner_element = "",
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string $owner_attribute = "",
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string $content_type = "") {
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$rel_parts = parse_url($rel_url);
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if (!$rel_url) return $base_url;
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/**
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* If parse_url failed to parse $rel_url return false to match the current "invalid thing" behavior
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* of UrlHelper::validate().
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*
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* TODO: There are many places where a string return value is assumed. We should either update those
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* to account for the possibility of failure, or look into updating this function's return values.
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*/
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if ($rel_parts === false) {
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return false;
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}
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if (!empty($rel_parts['host']) && !empty($rel_parts['scheme'])) {
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return self::validate($rel_url);
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// protocol-relative URL (rare but they exist)
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} else if (strpos($rel_url, "//") === 0) {
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return self::validate("https:" . $rel_url);
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// allow some extra schemes for A href
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} else if (in_array($rel_parts["scheme"] ?? "", self::EXTRA_HREF_SCHEMES, true) &&
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$owner_element == "a" &&
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$owner_attribute == "href") {
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return $rel_url;
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// allow some extra schemes for links with feed-specified content type i.e. enclosures
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} else if ($content_type &&
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isset(self::EXTRA_SCHEMES_BY_CONTENT_TYPE[$content_type]) &&
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in_array($rel_parts["scheme"], self::EXTRA_SCHEMES_BY_CONTENT_TYPE[$content_type])) {
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return $rel_url;
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// allow limited subset of inline base64-encoded images for IMG elements
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} else if (($rel_parts["scheme"] ?? "") == "data" &&
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preg_match('%^image/(webp|gif|jpg|png|svg);base64,%', $rel_parts["path"]) &&
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$owner_element == "img" &&
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$owner_attribute == "src") {
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return $rel_url;
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} else {
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$base_parts = parse_url($base_url);
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$rel_parts['host'] = $base_parts['host'] ?? "";
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$rel_parts['scheme'] = $base_parts['scheme'] ?? "";
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if ($rel_parts['path'] ?? "") {
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// we append dirname() of base path to relative URL path as per RFC 3986 section 5.2.2
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$base_path = with_trailing_slash(dirname($base_parts['path'] ?? ""));
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// 1. absolute relative path (/test.html) = no-op, proceed as is
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// 2. dotslash relative URI (./test.html) - strip "./", append base path
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if (strpos($rel_parts['path'], './') === 0) {
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$rel_parts['path'] = $base_path . substr($rel_parts['path'], 2);
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// 3. anything else relative (test.html) - append dirname() of base path
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} else if (strpos($rel_parts['path'], '/') !== 0) {
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$rel_parts['path'] = $base_path . $rel_parts['path'];
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}
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//$rel_parts['path'] = str_replace("/./", "/", $rel_parts['path']);
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//$rel_parts['path'] = str_replace("//", "/", $rel_parts['path']);
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}
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return self::validate(self::build_url($rel_parts));
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}
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}
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/** extended filtering involves validation for safe ports and loopback
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* @return false|string false if something went wrong, otherwise the URL string
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*/
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static function validate(string $url, bool $extended_filtering = false) {
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$url = clean($url);
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# fix protocol-relative URLs
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if (strpos($url, "//") === 0)
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$url = "https:" . $url;
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$tokens = parse_url($url);
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// this isn't really necessary because filter_var(... FILTER_VALIDATE_URL) requires host and scheme
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// as per https://php.watch/versions/7.3/filter-var-flag-deprecation but it might save time
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if (empty($tokens['host']))
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return false;
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if (!in_array(strtolower($tokens['scheme']), ['http', 'https']))
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return false;
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//convert IDNA hostname to punycode if possible
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if (function_exists("idn_to_ascii")) {
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if (mb_detect_encoding($tokens['host']) != 'ASCII') {
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if (defined('IDNA_NONTRANSITIONAL_TO_ASCII') && defined('INTL_IDNA_VARIANT_UTS46')) {
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$tokens['host'] = idn_to_ascii($tokens['host'], IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
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} else {
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$tokens['host'] = idn_to_ascii($tokens['host']);
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}
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// if `idn_to_ascii` failed
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if ($tokens['host'] === false) {
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return false;
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}
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}
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}
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// separate set of tokens with urlencoded 'path' because filter_var() rightfully fails on non-latin characters
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// (used for validation only, we actually request the original URL, in case of urlencode breaking it)
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$tokens_filter_var = $tokens;
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if ($tokens['path'] ?? false) {
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$tokens_filter_var['path'] = implode("/",
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array_map("rawurlencode",
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array_map("rawurldecode",
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explode("/", $tokens['path']))));
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}
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$url = self::build_url($tokens);
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$url_filter_var = self::build_url($tokens_filter_var);
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if (filter_var($url_filter_var, FILTER_VALIDATE_URL) === false)
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return false;
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if ($extended_filtering) {
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if (!in_array($tokens['port'] ?? '', [80, 443, '']))
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return false;
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if (strtolower($tokens['host']) == 'localhost' || $tokens['host'] == '::1' || strpos($tokens['host'], '127.') === 0)
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return false;
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}
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return $url;
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}
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/**
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* @return false|string
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*/
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static function resolve_redirects(string $url, int $timeout, int $nest = 0) {
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// too many redirects
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if ($nest > 10)
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return false;
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$context_options = array(
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'http' => array(
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'header' => array(
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'Connection: close'
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),
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'method' => 'HEAD',
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'timeout' => $timeout,
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'protocol_version'=> 1.1)
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);
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if (Config::get(Config::HTTP_PROXY)) {
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$context_options['http']['request_fulluri'] = true;
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$context_options['http']['proxy'] = Config::get(Config::HTTP_PROXY);
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}
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$context = stream_context_create($context_options);
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// PHP 8 changed the second param from int to bool, but we still support PHP >= 7.4.0
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// @phpstan-ignore-next-line
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$headers = get_headers($url, 0, $context);
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if (is_array($headers)) {
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$headers = array_reverse($headers); // last one is the correct one
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foreach($headers as $header) {
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if (stripos($header, 'Location:') === 0) {
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$url = self::rewrite_relative($url, trim(substr($header, strlen('Location:'))));
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return self::resolve_redirects($url, $timeout, $nest + 1);
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}
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}
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return $url;
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}
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// request failed?
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return false;
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}
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/**
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* @param array<string, bool|int|string>|string $options
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* @return false|string false if something went wrong, otherwise string contents
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*/
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// TODO: max_size currently only works for CURL transfers
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// TODO: multiple-argument way is deprecated, first parameter is a hash now
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public static function fetch($options /* previously: 0: $url , 1: $type = false, 2: $login = false, 3: $pass = false,
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4: $post_query = false, 5: $timeout = false, 6: $timestamp = 0, 7: $useragent = false*/) {
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self::$fetch_last_error = "";
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self::$fetch_last_error_code = -1;
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self::$fetch_last_error_content = "";
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self::$fetch_last_content_type = "";
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self::$fetch_curl_used = false;
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self::$fetch_last_modified = "";
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self::$fetch_effective_url = "";
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self::$fetch_effective_ip_addr = "";
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if (!is_array($options)) {
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// falling back on compatibility shim
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$option_names = [ "url", "type", "login", "pass", "post_query", "timeout", "last_modified", "useragent" ];
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$tmp = [];
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for ($i = 0; $i < func_num_args(); $i++) {
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$tmp[$option_names[$i]] = func_get_arg($i);
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}
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$options = $tmp;
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/*$options = array(
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"url" => func_get_arg(0),
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"type" => @func_get_arg(1),
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"login" => @func_get_arg(2),
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"pass" => @func_get_arg(3),
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"post_query" => @func_get_arg(4),
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"timeout" => @func_get_arg(5),
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"timestamp" => @func_get_arg(6),
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"useragent" => @func_get_arg(7)
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); */
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}
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$url = $options["url"];
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$type = isset($options["type"]) ? $options["type"] : false;
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$login = isset($options["login"]) ? $options["login"] : false;
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$pass = isset($options["pass"]) ? $options["pass"] : false;
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$post_query = isset($options["post_query"]) ? $options["post_query"] : false;
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$timeout = isset($options["timeout"]) ? $options["timeout"] : false;
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$last_modified = isset($options["last_modified"]) ? $options["last_modified"] : "";
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$useragent = isset($options["useragent"]) ? $options["useragent"] : false;
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$followlocation = isset($options["followlocation"]) ? $options["followlocation"] : true;
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$max_size = isset($options["max_size"]) ? $options["max_size"] : Config::get(Config::MAX_DOWNLOAD_FILE_SIZE); // in bytes
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$http_accept = isset($options["http_accept"]) ? $options["http_accept"] : false;
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$http_referrer = isset($options["http_referrer"]) ? $options["http_referrer"] : false;
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$url = ltrim($url, ' ');
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$url = str_replace(' ', '%20', $url);
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Debug::log("[UrlHelper] fetching: $url", Debug::LOG_EXTENDED);
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$url = self::validate($url, true);
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if (!$url) {
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self::$fetch_last_error = "Requested URL failed extended validation.";
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return false;
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}
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$url_host = parse_url($url, PHP_URL_HOST);
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$ip_addr = gethostbyname($url_host);
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if (!$ip_addr || strpos($ip_addr, "127.") === 0) {
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self::$fetch_last_error = "URL hostname failed to resolve or resolved to a loopback address ($ip_addr)";
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return false;
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}
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if (function_exists('curl_init') && !ini_get("open_basedir")) {
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self::$fetch_curl_used = true;
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$ch = curl_init($url);
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if (!$ch) return false;
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$curl_http_headers = [];
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if ($last_modified && !$post_query)
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array_push($curl_http_headers, "If-Modified-Since: $last_modified");
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if ($http_accept)
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array_push($curl_http_headers, "Accept: " . $http_accept);
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if (count($curl_http_headers) > 0)
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curl_setopt($ch, CURLOPT_HTTPHEADER, $curl_http_headers);
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curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout ? $timeout : Config::get(Config::FILE_FETCH_CONNECT_TIMEOUT));
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curl_setopt($ch, CURLOPT_TIMEOUT, $timeout ? $timeout : Config::get(Config::FILE_FETCH_TIMEOUT));
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curl_setopt($ch, CURLOPT_FOLLOWLOCATION, $followlocation);
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curl_setopt($ch, CURLOPT_MAXREDIRS, 20);
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curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($ch, CURLOPT_HEADER, true);
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curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
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curl_setopt($ch, CURLOPT_USERAGENT, $useragent ? $useragent : Config::get_user_agent());
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curl_setopt($ch, CURLOPT_ENCODING, "");
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curl_setopt($ch, CURLOPT_COOKIEJAR, "/dev/null");
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if ($http_referrer)
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curl_setopt($ch, CURLOPT_REFERER, $http_referrer);
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if ($max_size) {
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curl_setopt($ch, CURLOPT_NOPROGRESS, false);
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curl_setopt($ch, CURLOPT_BUFFERSIZE, 16384); // needed to get 5 arguments in progress function?
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// holy shit closures in php
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// download & upload are *expected* sizes respectively, could be zero
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curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, function($curl_handle, $download_size, $downloaded, $upload_size, $uploaded) use(&$max_size, $url) {
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//Debug::log("[curl progressfunction] $downloaded $max_size", Debug::$LOG_EXTENDED);
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if ($downloaded > $max_size) {
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Debug::log("[UrlHelper] fetch error: curl reached max size of $max_size bytes downloading $url, aborting.", Debug::LOG_VERBOSE);
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return 1;
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}
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return 0;
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});
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}
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if (Config::get(Config::HTTP_PROXY)) {
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curl_setopt($ch, CURLOPT_PROXY, Config::get(Config::HTTP_PROXY));
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}
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if ($post_query) {
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curl_setopt($ch, CURLOPT_POST, true);
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curl_setopt($ch, CURLOPT_POSTFIELDS, $post_query);
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}
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if ($login && $pass)
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curl_setopt($ch, CURLOPT_USERPWD, "$login:$pass");
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$ret = @curl_exec($ch);
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$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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// CURLAUTH_BASIC didn't work, let's retry with CURLAUTH_ANY in case it's actually something
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// unusual like NTLM...
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if ($http_code == 403 && $login && $pass) {
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curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
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$ret = @curl_exec($ch);
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}
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if (curl_errno($ch) === 23 || curl_errno($ch) === 61) {
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curl_setopt($ch, CURLOPT_ENCODING, 'none');
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$ret = @curl_exec($ch);
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}
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$headers_length = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
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$headers = explode("\r\n", substr($ret, 0, $headers_length));
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$contents = substr($ret, $headers_length);
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foreach ($headers as $header) {
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if (strstr($header, ": ") !== false) {
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list ($key, $value) = explode(": ", $header);
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if (strtolower($key) == "last-modified") {
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self::$fetch_last_modified = $value;
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}
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}
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if (substr(strtolower($header), 0, 7) == 'http/1.') {
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self::$fetch_last_error_code = (int) substr($header, 9, 3);
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self::$fetch_last_error = $header;
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}
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}
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$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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self::$fetch_last_content_type = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
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self::$fetch_effective_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
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if (!self::validate(self::$fetch_effective_url, true)) {
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self::$fetch_last_error = "URL received after redirection failed extended validation.";
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return false;
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}
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self::$fetch_effective_ip_addr = gethostbyname(parse_url(self::$fetch_effective_url, PHP_URL_HOST));
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if (!self::$fetch_effective_ip_addr || strpos(self::$fetch_effective_ip_addr, "127.") === 0) {
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self::$fetch_last_error = "URL hostname received after redirection failed to resolve or resolved to a loopback address (".self::$fetch_effective_ip_addr.")";
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return false;
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}
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self::$fetch_last_error_code = $http_code;
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if ($http_code != 200 || $type && strpos(self::$fetch_last_content_type, "$type") === false) {
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if (curl_errno($ch) != 0) {
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self::$fetch_last_error .= "; " . curl_errno($ch) . " " . curl_error($ch);
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} else {
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self::$fetch_last_error = "HTTP Code: $http_code ";
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}
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self::$fetch_last_error_content = $contents;
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curl_close($ch);
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return false;
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}
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if (!$contents) {
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if (curl_errno($ch) === 0) {
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self::$fetch_last_error = 'Successful response, but no content was received.';
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} else {
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self::$fetch_last_error = curl_errno($ch) . " " . curl_error($ch);
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}
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curl_close($ch);
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return false;
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}
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curl_close($ch);
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$is_gzipped = RSSUtils::is_gzipped($contents);
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if ($is_gzipped && is_string($contents)) {
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$tmp = @gzdecode($contents);
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if ($tmp) $contents = $tmp;
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}
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return $contents;
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} else {
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self::$fetch_curl_used = false;
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if ($login && $pass){
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$url_parts = array();
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preg_match("/(^[^:]*):\/\/(.*)/", $url, $url_parts);
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$pass = urlencode($pass);
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|
|
|
if ($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, $context);
|
|
|
|
if ($data === false) {
|
|
self::$fetch_last_error = "'file_get_contents' failed.";
|
|
return false;
|
|
}
|
|
|
|
foreach ($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 = $data;
|
|
|
|
return false;
|
|
}
|
|
|
|
if ($data) {
|
|
$is_gzipped = RSSUtils::is_gzipped($data);
|
|
|
|
if ($is_gzipped) {
|
|
$tmp = @gzdecode($data);
|
|
|
|
if ($tmp) $data = $tmp;
|
|
}
|
|
|
|
return $data;
|
|
} else {
|
|
self::$fetch_last_error = 'Successful response, but no content was received.';
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return false|string false if the provided URL didn't match expected patterns, otherwise the video ID string
|
|
*/
|
|
public static function url_to_youtube_vid(string $url) {
|
|
$url = str_replace("youtube.com", "youtube-nocookie.com", $url);
|
|
|
|
$regexps = [
|
|
"/\/\/www\.youtube-nocookie\.com\/v\/([\w-]+)/",
|
|
"/\/\/www\.youtube-nocookie\.com\/embed\/([\w-]+)/",
|
|
"/\/\/www\.youtube-nocookie\.com\/watch?v=([\w-]+)/",
|
|
"/\/\/youtu.be\/([\w-]+)/",
|
|
];
|
|
|
|
foreach ($regexps as $re) {
|
|
$matches = [];
|
|
|
|
if (preg_match($re, $url, $matches)) {
|
|
return $matches[1];
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
}
|