friendica/src/Util/Network.php

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<?php
/**
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* @copyright Copyright (C) 2010-2022, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Util;
use Friendica\Core\Hook;
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use Friendica\Core\Logger;
use Friendica\DI;
use Friendica\Model\Contact;
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use Friendica\Network\HTTPException\NotModifiedException;
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use GuzzleHttp\Psr7\Uri;
class Network
{
/**
* Return raw post data from a post request
*
* @return string post data
*/
public static function postdata()
{
return file_get_contents('php://input');
}
/**
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* Check URL to see if it's real
*
* Take a URL from the wild, prepend http:// if necessary
* and check DNS to see if it's real (or check if is a valid IP address)
*
* @param string $url The URL to be validated
* @return string|boolean The actual working URL, false else
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function isUrlValid(string $url)
{
if (DI::config()->get('system', 'disable_url_validation')) {
return $url;
}
// no naked subdomains (allow localhost for tests)
if (strpos($url, '.') === false && strpos($url, '/localhost/') === false) {
return false;
}
if (substr($url, 0, 4) != 'http') {
$url = 'http://' . $url;
}
/// @TODO Really suppress function outcomes? Why not find them + debug them?
$h = @parse_url($url);
if (!empty($h['host']) && (@dns_get_record($h['host'], DNS_A + DNS_CNAME) || filter_var($h['host'], FILTER_VALIDATE_IP))) {
return $url;
}
return false;
}
/**
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* Checks that email is an actual resolvable internet address
*
* @param string $addr The email address
* @return boolean True if it's a valid email address, false if it's not
*/
public static function isEmailDomainValid(string $addr)
{
if (DI::config()->get('system', 'disable_email_validation')) {
return true;
}
if (! strpos($addr, '@')) {
return false;
}
$h = substr($addr, strpos($addr, '@') + 1);
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// Concerning the @ see here: https://stackoverflow.com/questions/36280957/dns-get-record-a-temporary-server-error-occurred
if ($h && (@dns_get_record($h, DNS_A + DNS_MX) || filter_var($h, FILTER_VALIDATE_IP))) {
return true;
}
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if ($h && @dns_get_record($h, DNS_CNAME + DNS_MX)) {
return true;
}
return false;
}
/**
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* Check if URL is allowed
*
* Check $url against our list of allowed sites,
* wildcards allowed. If allowed_sites is unset return true;
*
* @param string $url URL which get tested
* @return boolean True if url is allowed otherwise return false
*/
public static function isUrlAllowed(string $url)
{
$h = @parse_url($url);
if (! $h) {
return false;
}
$str_allowed = DI::config()->get('system', 'allowed_sites');
if (! $str_allowed) {
return true;
}
$found = false;
$host = strtolower($h['host']);
// always allow our own site
if ($host == strtolower($_SERVER['SERVER_NAME'])) {
return true;
}
$fnmatch = function_exists('fnmatch');
$allowed = explode(',', $str_allowed);
if (count($allowed)) {
foreach ($allowed as $a) {
$pat = strtolower(trim($a));
if (($fnmatch && fnmatch($pat, $host)) || ($pat == $host)) {
$found = true;
break;
}
}
}
return $found;
}
/**
* Checks if the provided url domain is on the domain blocklist.
* Returns true if it is or malformed URL, false if not.
*
* @param string $url The url to check the domain from
*
* @return boolean
*/
public static function isUrlBlocked(string $url)
{
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$host = @parse_url($url, PHP_URL_HOST);
if (!$host) {
return false;
}
$domain_blocklist = DI::config()->get('system', 'blocklist', []);
if (!$domain_blocklist) {
return false;
}
foreach ($domain_blocklist as $domain_block) {
if (fnmatch(strtolower($domain_block['domain']), strtolower($host))) {
return true;
}
}
return false;
}
/**
* Checks if the provided url is on the list of domains where redirects are blocked.
* Returns true if it is or malformed URL, false if not.
*
* @param string $url The url to check the domain from
*
* @return boolean
*/
public static function isRedirectBlocked(string $url)
{
$host = @parse_url($url, PHP_URL_HOST);
if (!$host) {
return false;
}
$no_redirect_list = DI::config()->get('system', 'no_redirect_list', []);
if (!$no_redirect_list) {
return false;
}
foreach ($no_redirect_list as $no_redirect) {
if (fnmatch(strtolower($no_redirect), strtolower($host))) {
return true;
}
}
return false;
}
/**
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* Check if email address is allowed to register here.
*
* Compare against our list (wildcards allowed).
*
* @param string $email email address
* @return boolean False if not allowed, true if allowed
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* or if allowed list is not configured
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function isEmailDomainAllowed(string $email)
{
$domain = strtolower(substr($email, strpos($email, '@') + 1));
if (!$domain) {
return false;
}
$str_allowed = DI::config()->get('system', 'allowed_email', '');
if (empty($str_allowed)) {
return true;
}
$allowed = explode(',', $str_allowed);
return self::isDomainAllowed($domain, $allowed);
}
/**
* Checks for the existence of a domain in a domain list
*
* @param string $domain
* @param array $domain_list
* @return boolean
*/
public static function isDomainAllowed(string $domain, array $domain_list)
{
$found = false;
foreach ($domain_list as $item) {
$pat = strtolower(trim($item));
if (fnmatch($pat, $domain) || ($pat == $domain)) {
$found = true;
break;
}
}
return $found;
}
public static function lookupAvatarByEmail(string $email)
{
$avatar['size'] = 300;
$avatar['email'] = $email;
$avatar['url'] = '';
$avatar['success'] = false;
Hook::callAll('avatar_lookup', $avatar);
if (! $avatar['success']) {
$avatar['url'] = DI::baseUrl() . Contact::DEFAULT_AVATAR_PHOTO;
}
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Logger::info('Avatar: ' . $avatar['email'] . ' ' . $avatar['url']);
return $avatar['url'];
}
/**
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* Remove Google Analytics and other tracking platforms params from URL
*
* @param string $url Any user-submitted URL that may contain tracking params
* @return string The same URL stripped of tracking parameters
*/
public static function stripTrackingQueryParams(string $url)
{
$urldata = parse_url($url);
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if (!empty($urldata["query"])) {
$query = $urldata["query"];
parse_str($query, $querydata);
if (is_array($querydata)) {
foreach ($querydata as $param => $value) {
if (in_array(
$param,
[
"utm_source", "utm_medium", "utm_term", "utm_content", "utm_campaign",
"wt_mc", "pk_campaign", "pk_kwd", "mc_cid", "mc_eid",
"fb_action_ids", "fb_action_types", "fb_ref",
"awesm", "wtrid",
"woo_campaign", "woo_source", "woo_medium", "woo_content", "woo_term"]
)
) {
$pair = $param . "=" . urlencode($value);
$url = str_replace($pair, "", $url);
// Second try: if the url isn't encoded completely
$pair = $param . "=" . str_replace(" ", "+", $value);
$url = str_replace($pair, "", $url);
// Third try: Maybey the url isn't encoded at all
$pair = $param . "=" . $value;
$url = str_replace($pair, "", $url);
$url = str_replace(["?&", "&&"], ["?", ""], $url);
}
}
}
if (substr($url, -1, 1) == "?") {
$url = substr($url, 0, -1);
}
}
return $url;
}
/**
* Add a missing base path (scheme and host) to a given url
*
* @param string $url
* @param string $basepath
* @return string url
*/
public static function addBasePath(string $url, string $basepath)
{
if (!empty(parse_url($url, PHP_URL_SCHEME)) || empty(parse_url($basepath, PHP_URL_SCHEME)) || empty($url) || empty(parse_url($url))) {
return $url;
}
$base = ['scheme' => parse_url($basepath, PHP_URL_SCHEME),
'host' => parse_url($basepath, PHP_URL_HOST)];
$parts = array_merge($base, parse_url('/' . ltrim($url, '/')));
return self::unparseURL($parts);
}
/**
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* Find the matching part between two url
*
* @param string $url1
* @param string $url2
* @return string The matching part
*/
public static function getUrlMatch(string $url1, string $url2)
{
if (($url1 == "") || ($url2 == "")) {
return "";
}
$url1 = Strings::normaliseLink($url1);
$url2 = Strings::normaliseLink($url2);
$parts1 = parse_url($url1);
$parts2 = parse_url($url2);
if (!isset($parts1["host"]) || !isset($parts2["host"])) {
return "";
}
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if (empty($parts1["scheme"])) {
$parts1["scheme"] = '';
}
if (empty($parts2["scheme"])) {
$parts2["scheme"] = '';
}
if ($parts1["scheme"] != $parts2["scheme"]) {
return "";
}
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if (empty($parts1["host"])) {
$parts1["host"] = '';
}
if (empty($parts2["host"])) {
$parts2["host"] = '';
}
if ($parts1["host"] != $parts2["host"]) {
return "";
}
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if (empty($parts1["port"])) {
$parts1["port"] = '';
}
if (empty($parts2["port"])) {
$parts2["port"] = '';
}
if ($parts1["port"] != $parts2["port"]) {
return "";
}
$match = $parts1["scheme"]."://".$parts1["host"];
if ($parts1["port"]) {
$match .= ":".$parts1["port"];
}
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if (empty($parts1["path"])) {
$parts1["path"] = '';
}
if (empty($parts2["path"])) {
$parts2["path"] = '';
}
$pathparts1 = explode("/", $parts1["path"]);
$pathparts2 = explode("/", $parts2["path"]);
$i = 0;
$path = "";
do {
$path1 = $pathparts1[$i] ?? '';
$path2 = $pathparts2[$i] ?? '';
if ($path1 == $path2) {
$path .= $path1."/";
}
} while (($path1 == $path2) && ($i++ <= count($pathparts1)));
$match .= $path;
return Strings::normaliseLink($match);
}
/**
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* Glue url parts together
*
* @param array $parsed URL parts
*
* @return string The glued URL.
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* @deprecated since version 2021.12, use GuzzleHttp\Psr7\Uri::fromParts($parts) instead
*/
public static function unparseURL(array $parsed)
{
$get = function ($key) use ($parsed) {
return isset($parsed[$key]) ? $parsed[$key] : null;
};
$pass = $get('pass');
$user = $get('user');
$userinfo = $pass !== null ? "$user:$pass" : $user;
$port = $get('port');
$scheme = $get('scheme');
$query = $get('query');
$fragment = $get('fragment');
$authority = ($userinfo !== null ? $userinfo."@" : '') .
$get('host') .
($port ? ":$port" : '');
return (strlen($scheme) ? $scheme.":" : '') .
(strlen($authority) ? "//".$authority : '') .
$get('path') .
(strlen($query) ? "?".$query : '') .
(strlen($fragment) ? "#".$fragment : '');
}
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/**
* Convert an URI to an IDN compatible URI
*
* @param string $uri
* @return string
*/
public static function convertToIdn(string $uri): string
{
$parts = parse_url($uri);
if (!empty($parts['scheme']) && !empty($parts['host'])) {
$parts['host'] = idn_to_ascii($parts['host']);
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$uri = Uri::fromParts($parts);
} else {
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$parts = explode('@', $uri);
if (count($parts) == 2) {
$uri = $parts[0] . '@' . idn_to_ascii($parts[1]);
} else {
$uri = idn_to_ascii($uri);
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}
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}
return $uri;
}
/**
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* Switch the scheme of an url between http and https
*
* @param string $url URL
*
* @return string switched URL
*/
public static function switchScheme(string $url)
{
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$scheme = parse_url($url, PHP_URL_SCHEME);
if (empty($scheme)) {
return $url;
}
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if ($scheme === 'http') {
$url = str_replace('http://', 'https://', $url);
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} elseif ($scheme === 'https') {
$url = str_replace('https://', 'http://', $url);
}
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return $url;
}
/**
* Adds query string parameters to the provided URI. Replace the value of existing keys.
*
* @param string $path
* @param array $additionalParams Associative array of parameters
* @return string
*/
public static function appendQueryParam(string $path, array $additionalParams)
{
$parsed = parse_url($path);
$params = [];
if (!empty($parsed['query'])) {
parse_str($parsed['query'], $params);
}
$params = array_merge($params, $additionalParams);
$parsed['query'] = http_build_query($params);
return self::unparseURL($parsed);
}
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/**
* Generates ETag and Last-Modified response headers and checks them against
* If-None-Match and If-Modified-Since request headers if present.
*
* Blocking function, sends 304 headers and exits if check passes.
*
* @param string $etag The page etag
* @param string $last_modified The page last modification UTC date
* @throws \Exception
*/
public static function checkEtagModified(string $etag, string $last_modified)
{
$last_modified = DateTimeFormat::utc($last_modified, 'D, d M Y H:i:s') . ' GMT';
/**
* @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26
*/
$if_none_match = filter_input(INPUT_SERVER, 'HTTP_IF_NONE_MATCH');
$if_modified_since = filter_input(INPUT_SERVER, 'HTTP_IF_MODIFIED_SINCE');
$flag_not_modified = null;
if ($if_none_match) {
$result = [];
preg_match('/^(?:W\/")?([^"]+)"?$/i', $etag, $result);
$etagTrimmed = $result[1];
// Lazy exact ETag match, could check weak/strong ETags
$flag_not_modified = $if_none_match == '*' || strpos($if_none_match, $etagTrimmed) !== false;
}
if ($if_modified_since && (!$if_none_match || $flag_not_modified)) {
// Lazy exact Last-Modified match, could check If-Modified-Since validity
$flag_not_modified = $if_modified_since == $last_modified;
}
header('Etag: ' . $etag);
header('Last-Modified: ' . $last_modified);
if ($flag_not_modified) {
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throw new NotModifiedException();
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}
}
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/**
* Check if the given URL is a local link
*
* @param string $url
* @return bool
*/
public static function isLocalLink(string $url)
{
return (strpos(Strings::normaliseLink($url), Strings::normaliseLink(DI::baseUrl())) !== false);
}
/**
* Check if the given URL is a valid HTTP/HTTPS URL
*
* @param string $url
* @return bool
*/
public static function isValidHttpUrl(string $url)
{
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$scheme = parse_url($url, PHP_URL_SCHEME);
return !empty($scheme) && in_array($scheme, ['http', 'https']) && parse_url($url, PHP_URL_HOST);
}
}