552 lines
13 KiB
PHP
552 lines
13 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Util;
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use Friendica\Core\Hook;
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use Friendica\Core\Logger;
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use Friendica\DI;
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use Friendica\Model\Contact;
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class Network
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{
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/**
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* Return raw post data from a post request
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*
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* @return string post data
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*/
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public static function postdata()
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{
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return file_get_contents('php://input');
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}
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/**
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* Check URL to see if it's real
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*
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* Take a URL from the wild, prepend http:// if necessary
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* and check DNS to see if it's real (or check if is a valid IP address)
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*
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* @param string $url The URL to be validated
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* @return string|boolean The actual working URL, false else
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function isUrlValid(string $url)
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{
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if (DI::config()->get('system', 'disable_url_validation')) {
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return $url;
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}
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// no naked subdomains (allow localhost for tests)
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if (strpos($url, '.') === false && strpos($url, '/localhost/') === false) {
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return false;
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}
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if (substr($url, 0, 4) != 'http') {
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$url = 'http://' . $url;
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}
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/// @TODO Really suppress function outcomes? Why not find them + debug them?
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$h = @parse_url($url);
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if (!empty($h['host']) && (@dns_get_record($h['host'], DNS_A + DNS_CNAME) || filter_var($h['host'], FILTER_VALIDATE_IP))) {
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return $url;
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}
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return false;
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}
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/**
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* Checks that email is an actual resolvable internet address
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*
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* @param string $addr The email address
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* @return boolean True if it's a valid email address, false if it's not
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*/
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public static function isEmailDomainValid(string $addr)
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{
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if (DI::config()->get('system', 'disable_email_validation')) {
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return true;
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}
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if (! strpos($addr, '@')) {
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return false;
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}
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$h = substr($addr, strpos($addr, '@') + 1);
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// Concerning the @ see here: https://stackoverflow.com/questions/36280957/dns-get-record-a-temporary-server-error-occurred
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if ($h && (@dns_get_record($h, DNS_A + DNS_MX) || filter_var($h, FILTER_VALIDATE_IP))) {
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return true;
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}
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if ($h && @dns_get_record($h, DNS_CNAME + DNS_MX)) {
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return true;
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}
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return false;
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}
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/**
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* Check if URL is allowed
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*
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* Check $url against our list of allowed sites,
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* wildcards allowed. If allowed_sites is unset return true;
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*
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* @param string $url URL which get tested
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* @return boolean True if url is allowed otherwise return false
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*/
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public static function isUrlAllowed(string $url)
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{
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$h = @parse_url($url);
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if (! $h) {
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return false;
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}
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$str_allowed = DI::config()->get('system', 'allowed_sites');
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if (! $str_allowed) {
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return true;
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}
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$found = false;
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$host = strtolower($h['host']);
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// always allow our own site
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if ($host == strtolower($_SERVER['SERVER_NAME'])) {
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return true;
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}
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$fnmatch = function_exists('fnmatch');
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$allowed = explode(',', $str_allowed);
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if (count($allowed)) {
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foreach ($allowed as $a) {
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$pat = strtolower(trim($a));
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if (($fnmatch && fnmatch($pat, $host)) || ($pat == $host)) {
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$found = true;
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break;
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}
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}
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}
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return $found;
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}
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/**
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* Checks if the provided url domain is on the domain blocklist.
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* Returns true if it is or malformed URL, false if not.
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*
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* @param string $url The url to check the domain from
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*
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* @return boolean
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*/
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public static function isUrlBlocked(string $url)
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{
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$host = @parse_url($url, PHP_URL_HOST);
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if (!$host) {
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return false;
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}
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$domain_blocklist = DI::config()->get('system', 'blocklist', []);
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if (!$domain_blocklist) {
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return false;
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}
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foreach ($domain_blocklist as $domain_block) {
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if (fnmatch(strtolower($domain_block['domain']), strtolower($host))) {
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return true;
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}
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}
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return false;
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}
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/**
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* Checks if the provided url is on the list of domains where redirects are blocked.
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* Returns true if it is or malformed URL, false if not.
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*
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* @param string $url The url to check the domain from
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*
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* @return boolean
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*/
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public static function isRedirectBlocked(string $url)
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{
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$host = @parse_url($url, PHP_URL_HOST);
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if (!$host) {
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return false;
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}
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$no_redirect_list = DI::config()->get('system', 'no_redirect_list', []);
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if (!$no_redirect_list) {
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return false;
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}
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foreach ($no_redirect_list as $no_redirect) {
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if (fnmatch(strtolower($no_redirect), strtolower($host))) {
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return true;
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}
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}
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return false;
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}
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/**
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* Check if email address is allowed to register here.
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*
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* Compare against our list (wildcards allowed).
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*
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* @param string $email email address
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* @return boolean False if not allowed, true if allowed
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* or if allowed list is not configured
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function isEmailDomainAllowed(string $email)
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{
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$domain = strtolower(substr($email, strpos($email, '@') + 1));
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if (!$domain) {
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return false;
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}
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$str_allowed = DI::config()->get('system', 'allowed_email', '');
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if (empty($str_allowed)) {
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return true;
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}
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$allowed = explode(',', $str_allowed);
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return self::isDomainAllowed($domain, $allowed);
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}
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/**
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* Checks for the existence of a domain in a domain list
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*
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* @param string $domain
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* @param array $domain_list
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* @return boolean
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*/
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public static function isDomainAllowed(string $domain, array $domain_list)
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{
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$found = false;
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foreach ($domain_list as $item) {
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$pat = strtolower(trim($item));
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if (fnmatch($pat, $domain) || ($pat == $domain)) {
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$found = true;
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break;
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}
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}
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return $found;
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}
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public static function lookupAvatarByEmail(string $email)
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{
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$avatar['size'] = 300;
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$avatar['email'] = $email;
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$avatar['url'] = '';
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$avatar['success'] = false;
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Hook::callAll('avatar_lookup', $avatar);
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if (! $avatar['success']) {
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$avatar['url'] = DI::baseUrl() . Contact::DEFAULT_AVATAR_PHOTO;
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}
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Logger::log('Avatar: ' . $avatar['email'] . ' ' . $avatar['url'], Logger::DEBUG);
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return $avatar['url'];
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}
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/**
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* Remove Google Analytics and other tracking platforms params from URL
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*
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* @param string $url Any user-submitted URL that may contain tracking params
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* @return string The same URL stripped of tracking parameters
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*/
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public static function stripTrackingQueryParams(string $url)
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{
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$urldata = parse_url($url);
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if (!empty($urldata["query"])) {
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$query = $urldata["query"];
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parse_str($query, $querydata);
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if (is_array($querydata)) {
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foreach ($querydata as $param => $value) {
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if (in_array(
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$param,
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[
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"utm_source", "utm_medium", "utm_term", "utm_content", "utm_campaign",
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"wt_mc", "pk_campaign", "pk_kwd", "mc_cid", "mc_eid",
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"fb_action_ids", "fb_action_types", "fb_ref",
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"awesm", "wtrid",
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"woo_campaign", "woo_source", "woo_medium", "woo_content", "woo_term"]
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)
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) {
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$pair = $param . "=" . urlencode($value);
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$url = str_replace($pair, "", $url);
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// Second try: if the url isn't encoded completely
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$pair = $param . "=" . str_replace(" ", "+", $value);
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$url = str_replace($pair, "", $url);
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// Third try: Maybey the url isn't encoded at all
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$pair = $param . "=" . $value;
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$url = str_replace($pair, "", $url);
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$url = str_replace(["?&", "&&"], ["?", ""], $url);
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}
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}
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}
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if (substr($url, -1, 1) == "?") {
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$url = substr($url, 0, -1);
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}
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}
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return $url;
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}
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/**
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* Add a missing base path (scheme and host) to a given url
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*
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* @param string $url
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* @param string $basepath
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* @return string url
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*/
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public static function addBasePath(string $url, string $basepath)
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{
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if (!empty(parse_url($url, PHP_URL_SCHEME)) || empty(parse_url($basepath, PHP_URL_SCHEME)) || empty($url) || empty(parse_url($url))) {
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return $url;
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}
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$base = ['scheme' => parse_url($basepath, PHP_URL_SCHEME),
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'host' => parse_url($basepath, PHP_URL_HOST)];
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$parts = array_merge($base, parse_url('/' . ltrim($url, '/')));
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return self::unparseURL($parts);
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}
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/**
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* Find the matching part between two url
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*
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* @param string $url1
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* @param string $url2
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* @return string The matching part
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*/
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public static function getUrlMatch(string $url1, string $url2)
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{
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if (($url1 == "") || ($url2 == "")) {
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return "";
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}
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$url1 = Strings::normaliseLink($url1);
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$url2 = Strings::normaliseLink($url2);
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$parts1 = parse_url($url1);
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$parts2 = parse_url($url2);
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if (!isset($parts1["host"]) || !isset($parts2["host"])) {
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return "";
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}
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if (empty($parts1["scheme"])) {
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$parts1["scheme"] = '';
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}
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if (empty($parts2["scheme"])) {
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$parts2["scheme"] = '';
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}
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if ($parts1["scheme"] != $parts2["scheme"]) {
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return "";
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}
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if (empty($parts1["host"])) {
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$parts1["host"] = '';
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}
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if (empty($parts2["host"])) {
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$parts2["host"] = '';
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}
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if ($parts1["host"] != $parts2["host"]) {
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return "";
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}
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if (empty($parts1["port"])) {
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$parts1["port"] = '';
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}
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if (empty($parts2["port"])) {
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$parts2["port"] = '';
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}
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if ($parts1["port"] != $parts2["port"]) {
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return "";
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}
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$match = $parts1["scheme"]."://".$parts1["host"];
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if ($parts1["port"]) {
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$match .= ":".$parts1["port"];
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}
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if (empty($parts1["path"])) {
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$parts1["path"] = '';
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}
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if (empty($parts2["path"])) {
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$parts2["path"] = '';
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}
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$pathparts1 = explode("/", $parts1["path"]);
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$pathparts2 = explode("/", $parts2["path"]);
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$i = 0;
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$path = "";
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do {
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$path1 = $pathparts1[$i] ?? '';
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$path2 = $pathparts2[$i] ?? '';
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if ($path1 == $path2) {
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$path .= $path1."/";
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}
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} while (($path1 == $path2) && ($i++ <= count($pathparts1)));
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$match .= $path;
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return Strings::normaliseLink($match);
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}
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/**
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* Glue url parts together
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*
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* @param array $parsed URL parts
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*
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* @return string The glued URL
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*/
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public static function unparseURL(array $parsed)
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{
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$get = function ($key) use ($parsed) {
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return isset($parsed[$key]) ? $parsed[$key] : null;
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};
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$pass = $get('pass');
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$user = $get('user');
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$userinfo = $pass !== null ? "$user:$pass" : $user;
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$port = $get('port');
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$scheme = $get('scheme');
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$query = $get('query');
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$fragment = $get('fragment');
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$authority = ($userinfo !== null ? $userinfo."@" : '') .
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$get('host') .
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($port ? ":$port" : '');
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return (strlen($scheme) ? $scheme.":" : '') .
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(strlen($authority) ? "//".$authority : '') .
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$get('path') .
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(strlen($query) ? "?".$query : '') .
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(strlen($fragment) ? "#".$fragment : '');
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}
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/**
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* Switch the scheme of an url between http and https
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*
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* @param string $url URL
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*
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* @return string switched URL
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*/
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public static function switchScheme(string $url)
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{
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$scheme = parse_url($url, PHP_URL_SCHEME);
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if (empty($scheme)) {
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return $url;
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}
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if ($scheme === 'http') {
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$url = str_replace('http://', 'https://', $url);
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} elseif ($scheme === 'https') {
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$url = str_replace('https://', 'http://', $url);
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}
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return $url;
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}
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/**
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* Adds query string parameters to the provided URI. Replace the value of existing keys.
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*
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* @param string $path
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* @param array $additionalParams Associative array of parameters
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* @return string
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*/
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public static function appendQueryParam(string $path, array $additionalParams)
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{
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$parsed = parse_url($path);
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$params = [];
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if (!empty($parsed['query'])) {
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parse_str($parsed['query'], $params);
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}
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$params = array_merge($params, $additionalParams);
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$parsed['query'] = http_build_query($params);
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return self::unparseURL($parsed);
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}
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/**
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* Generates ETag and Last-Modified response headers and checks them against
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* If-None-Match and If-Modified-Since request headers if present.
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*
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* Blocking function, sends 304 headers and exits if check passes.
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*
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* @param string $etag The page etag
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* @param string $last_modified The page last modification UTC date
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* @throws \Exception
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*/
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public static function checkEtagModified(string $etag, string $last_modified)
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{
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$last_modified = DateTimeFormat::utc($last_modified, 'D, d M Y H:i:s') . ' GMT';
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/**
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* @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26
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*/
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$if_none_match = filter_input(INPUT_SERVER, 'HTTP_IF_NONE_MATCH');
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$if_modified_since = filter_input(INPUT_SERVER, 'HTTP_IF_MODIFIED_SINCE');
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$flag_not_modified = null;
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if ($if_none_match) {
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$result = [];
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preg_match('/^(?:W\/")?([^"]+)"?$/i', $etag, $result);
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$etagTrimmed = $result[1];
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// Lazy exact ETag match, could check weak/strong ETags
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$flag_not_modified = $if_none_match == '*' || strpos($if_none_match, $etagTrimmed) !== false;
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}
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if ($if_modified_since && (!$if_none_match || $flag_not_modified)) {
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// Lazy exact Last-Modified match, could check If-Modified-Since validity
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$flag_not_modified = $if_modified_since == $last_modified;
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}
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header('Etag: ' . $etag);
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header('Last-Modified: ' . $last_modified);
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if ($flag_not_modified) {
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header("HTTP/1.1 304 Not Modified");
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exit;
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}
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}
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}
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