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663 lines
21 KiB
PHP
663 lines
21 KiB
PHP
<?php
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// requires php-curl
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// some global stuff
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// set timeout for file_get_contents()
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ini_set('default_socket_timeout', 4); // 4 seconds, default is 60
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// curl timeout is millisecons
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$curl_timeout_ms = 2000;
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// do not report warnings (timeouts, SSL/TLS errors)
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error_reporting(E_ALL & ~E_WARNING);
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// regex that matches room join links like http://1.2.3.4:56789/token?public_key=0123456789abcdef
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$room_join_regex = "/https?:\/\/.+\?public_key=[0-9a-f]+/" ; //TODO: How long can a public key be? Most likely exactly 64 chars long
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// room token regex part
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$room_token_regex_part = "[0-9A-Za-z]+"; //TODO: actually correct?
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/*
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* Some servers don't appear in the wild yet, but can be queried
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* Ideally this shouldn't be necessary, but it is for now
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*/
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$known_servers = array(
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"http://open.session.codes",
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"https://open.getsession.org"
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);
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$known_pubkeys = array(
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"open.session.codes" => "c7fbfa183b601f4d393a43644dae11e5f644db2a18c747865db1ca922e632e32",
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"open.getsession.org" => "a03c383cf63c3c4efe67acc52112a6dd734b3a946b9545f488aaa93da7991238"
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);
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// path for HTML output
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$output = "output/index.php";
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// run main function
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main();
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function main() {
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$timestamp = time(); // unix timestamp in seconds
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echo("Running, please wait..." . PHP_EOL);
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echo("This script will take approximately 2 minutes to run." . PHP_EOL);
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$html = get_html_from_known_sources();
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$wild_join_links = extract_join_links_from_html($html);
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$servers = get_servers_from_join_links($wild_join_links);
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$servers = reduce_servers($servers);
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$servers = merge_servers_with_known_good_servers($servers);
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$rooms = query_servers_for_rooms($servers);
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$pubkeys = acquire_pubkeys_from_join_links($wild_join_links);
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$pubkeys = merge_pubkeys_with_known_pubkeys($pubkeys);
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$addr_assignments = get_pubkeys_of_servers($servers, $pubkeys);
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$addr_assignments = reduce_addresses_of_pubkeys($addr_assignments);
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$room_assignments = assign_rooms_to_address_assignments($addr_assignments, $rooms);
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$final_join_links = generate_join_links($room_assignments);
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print_r($servers);
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// print_r($rooms);
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// print_r($addr_assignments);
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// print_r($room_assignments); //TODO: We also assigned empty room arrays. Should probably be fixed
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// print_r($final_join_links);
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// echo(count($final_join_links) . " unique Session Communities have been found." . PHP_EOL);
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//TODO: What about room view links?
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$table_html = get_table_html($room_assignments);
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$title = "Self-updating list of active Session Communities";
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$final_html = create_html_page_from_table($table_html, $title, $timestamp);
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// write output to disk
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global $output;
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file_put_contents($output, $final_html); // overwrites existing file
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}
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/*
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* Queries following known sources of join links for Session Communities:
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* - Awesome Session Open Group List repository on GithUb
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* - LokiLocker.com Open Groups
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* - https://session.directory open groups
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*/
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function get_html_from_known_sources() {
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// known open group / community lists
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$asgl = "https://github.com/GNU-Linux-libre/Awesome-Session-Group-List/raw/main/README.md";
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$ll = "https://lokilocker.com/Mods/Session-Groups/wiki/Session-Open-Groups";
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$sd_pre = "https://session.directory/?all=groups" ; // this one has to be expanded first
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// get awesome session group list html
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$asgl_html = file_get_contents($asgl);
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// get lokilocker.com html
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$ll_html = file_get_contents($ll);
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// get session.directory html
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$sd_html = "";
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$sd_pre_html = file_get_contents($sd_pre);
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$sd_pattern = "/view_session_group_user_lokinet\.php\?id=\d+/";
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preg_match_all($sd_pattern, $sd_pre_html, $sd_links);
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$sd_links = $sd_links[0]; // don't know why
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foreach ($sd_links as &$link) {
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// add prefix "https://session.directory to the sd_links
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$link = str_replace('view_session_group_user_lokinet.php?id=', 'https://session.directory/view_session_group_user_lokinet.php?id=', $link);
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// add html to sd_html
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$sd_html = $sd_html . file_get_contents($link);
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}
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// merge all html into a single string
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return(
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$asgl_html . PHP_EOL .
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$ll_html . PHP_EOL .
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$sd_html
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);
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}
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/*
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* Extracts all links that match the $room_join_regex
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* Example: http(s)://whatever:port/?public_key=0123456789abcef
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* Result is sorted and unique
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* There's no check for reachability or additional https availability
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*/
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function extract_join_links_from_html($html){
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global $room_join_regex;
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$result = array();
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preg_match_all($room_join_regex, $html, $result);
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$result = $result[0]; // there's only $result[0], no $result[1] or others
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// filter $result[0] because some entries look like this:
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//[106] => http://sog.caliban.org/im?public_key=118df8c6c471ac0468c7c77e1cdc12f24a139ee8a07c6e3bf4e7855640dad821" rel="nofollow">http://sog.caliban.org/im?public_key=118df8c6c471ac0468c7c77e1cdc12f24a139ee8a07c6e3bf4e7855640dad821
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//TODO: Figure out why the regex does match those
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foreach($result as &$entry) {
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if(str_contains($entry, "\"")) {
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$entry = explode("\"", $entry)[0]; // split on " and take first part
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}
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}
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$result = array_unique($result);
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sort($result);
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return $result;
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}
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/*
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* Gets all servers from an array of join links
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* Returns an array that looks like this:
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* [0] => 1.2.3.4
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* [1] => 2.3.4.5:12345
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* [2] => example.com
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* [3] => dev.test:23456
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* Result is sorted and unique
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*/
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function get_servers_from_join_links($join_links_arr) {
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$result = array();
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foreach($join_links_arr as $join_link){
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$split = array();
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$split = explode("/", $join_link); // http(s): + "" + 1.2.3.4:56789 + "name?public_key=0123456789abcdef"
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$result[] = $split[2]; // 1.2.3.4:56789
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}
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$result = array_unique($result);
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sort($result);
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return $result;
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}
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/*
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* Checks whether servers are reachable and whether they support https
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* and makes sure that there are no http/https duplicates
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* Input is an array of servers without protocol (no http:(s)// in front)
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* Result is unique and sorted
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*/
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function reduce_servers($servers_arr) {
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$reduced_servers = array();
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$offline_servers = array(); // debug
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foreach($servers_arr as $server) {
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// try https
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$url = "https://" . $server;
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if(url_is_reachable($url)){
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$reduced_servers[] = $url;
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}
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else{
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// try http
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$url = "http://" . $server;
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if(url_is_reachable($url)){
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$reduced_servers[] = $url;
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}
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else {
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$offline_servers[] = $url;
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// echo("Server " . $server . " is not reachable" . PHP_EOL);
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}
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}
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}
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$reduced_servers = array_unique($reduced_servers);
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sort($reduced_servers);
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return $reduced_servers;
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}
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/*
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* Some servers don't appear in the wild yet, but can be queried
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* Ideally this shouldn't be necessary, but it is for now
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* Should be called after reduce_servers()
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*/
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function merge_servers_with_known_good_servers($url_arr){
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$result = array();
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global $known_servers;
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$result = array_merge($url_arr, $known_servers);
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$result = array_unique($result); // just in case we accidentally add a duplicate
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sort($result);
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return $result;
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}
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/*
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* Helper function for reduce_servers
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*/
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function url_is_reachable($url) {
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global $curl_timeout_ms;
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$ch = curl_init($url);
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curl_setopt($ch, CURLOPT_NOBODY, true);
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curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
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curl_setopt($ch, CURLOPT_TIMEOUT_MS, $curl_timeout_ms);
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curl_exec($ch);
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$retcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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curl_close($ch);
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if ($retcode == 200) {
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return true;
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}
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else {
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// echo($url . " is " . $retcode . PHP_EOL);
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return false;
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}
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}
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/*
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* Takes an input like this:
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* [0] => http://1.2.3.4
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* [1] => https://2.3.4.5:12345
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* [2] => https://example.com
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* [3] => http://dev.test:23456
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* and queries the /room JSON API endpoint
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* Returns a multidimensional array
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* The first dimension uses the server URL as public_key
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* The second dimension is an array that contains $room_array array
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* $room_array arrays contain token, name, users and description
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*/
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function query_servers_for_rooms($url_arr){
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$rooms = array();
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$endpoint = "/rooms";
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$failed = array(); // debug
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// we can't use array_unique later so we make sure the input is unique
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$url_arr = array_unique($url_arr); // not really necessary though
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// we can't use sort or asort later so me do it now
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sort($url_arr); // not really necessary though
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foreach($url_arr as $url) {
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$json_url = $url . $endpoint;
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$json = file_get_contents($json_url);
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if($json) {
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$json_obj = json_decode($json);
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$server_rooms = array();
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// if response was not empty
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if($json_obj) {
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foreach($json_obj as $json_room) {
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$token = $json_room->token; // room "name"
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$room_array = array(
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"token" => $token,
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"name" => $json_room->name,
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"active_users" => $json_room->active_users,
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"description" => $json_room->description
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);
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//$server_rooms[] = $token;
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$server_rooms[$token] = $room_array;
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}
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//sort($server_rooms);
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$rooms[$url] = $server_rooms;
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}
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}
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else {
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// 404 - could mean it's a legacy server that doesn't provide /room endpoint
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$failed[] = $url;
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$legacy_rooms = query_homepage_for_rooms($url);
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if($legacy_rooms) {
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$rooms[$url] = $legacy_rooms;
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}
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}
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}
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// print_r($failed);
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return $rooms;
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}
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/*
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* For servers that do not provide the /rooms endpoint
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* Takes same input as query_api_for_rooms(), but only singular URL
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* Returns array of all available rooms (each its own array with token, name, users and description)
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* Result is false if no rooms where found
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*/
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function query_homepage_for_rooms($url) {
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$result = array();
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global $room_token_regex_part;
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$contents = file_get_contents($url);
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if($contents) {
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$regex_new = "/\/r\/" . $room_token_regex_part . "/";
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$regex_old = "/\/view\/room\/" . $room_token_regex_part . "/";
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preg_match_all($regex_new, $contents, $rooms);
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$rooms = $rooms[0];
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// if the new regex doesn't match, use the old one
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if(empty($rooms)) {
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preg_match_all($regex_old, $contents, $rooms);
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$rooms = $rooms[0];
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}
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// if one of the two regex has found anything
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if(!empty($rooms)) {
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// we also want the room names (not tokens)
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preg_match_all('/<li.*?><a.*?>(.*?)<\/a><\/li>/', $contents, $names);
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$names = $names[1]; // [1] contains only the contents of the a tags, not the li or a tags themselves
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// at this point the array contents look either like this:
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// /r/token
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// or like this
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// /view/room/token
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// so split by / and use last element
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foreach($rooms as $i => $room) {
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$exploded = explode("/", $room);
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$token = $exploded[count($exploded) - 1]; // take last element
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$room_array = array(
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"token" => $token,
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"name" => $names[$i], // take same index in $names array
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"active_users" => -1, // without API we can't query the acutal number
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"description" => null // same goes for the description
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);
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//$result[] = $token;
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$result[$token] = $room_array;
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}
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}
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else {
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return false;
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}
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}
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else {
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return false;
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}
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$result = array_unique($result);
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//sort($result);
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return $result;
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}
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/*
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* Returns an array with the server URLs as keys and the public keys an value
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* "https://server:port" => "somehexstring"
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*/
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function acquire_pubkeys_from_join_links($join_links_arr) {
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$result = array();
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foreach($join_links_arr as $join_link) {
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// example: http://1.2.3.4:56789/token?public_key=0123456789abcdef
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// we split by / and take the index [2] as the server
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$server = explode("/", $join_link)[2];
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// we assume everything behind the "=" is the public key
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$pubkey = explode("=", $join_link)[1];
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$result[$server] = $pubkey;
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}
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return $result;
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}
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/*
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* Merge pubkeys
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*/
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function merge_pubkeys_with_known_pubkeys($pubkeys_arr) {
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$result = array();
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global $known_pubkeys;
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$result = array_merge($pubkeys_arr, $known_pubkeys);
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return $result;
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}
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/*
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* Returns an array with the pubkey as index and the server(s) as an value array
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* Expects the $servers_arr to be with protocol
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*/
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function get_pubkeys_of_servers($servers_arr, $pubkeys_arr) {
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$result = array();
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$server_to_pubkey = array();
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// print_r($servers_arr);
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// print_r($pubkeys_arr);
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// first create an array of all public keys
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// we do this because it is possible that the same server has been added with multiple URLs (but the same public key
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$unique_pubkeys = array();
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foreach($pubkeys_arr as $pk_server => $pk_value) {
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$unique_pubkeys[] = $pk_value;
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}
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$unique_pubkeys = array_unique($unique_pubkeys);
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sort($unique_pubkeys);
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// then assign $server_url => $pubkey
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foreach($servers_arr as $server_url) {
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// split protocol
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$server = explode("//", $server_url)[1];
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$server_to_pubkey[$server_url] = $pubkeys_arr[$server];
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}
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// print_r($server_to_pubkey);
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// but this still has duplicates in it
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// so we get every address for a known pubkey so the reuslt is an array:
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// result[$pubkey] = array("address1", "address2", ...);
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foreach($unique_pubkeys as $pubkey) {
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$addresses = array();
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foreach($server_to_pubkey as $s_address => $s_pubkey) {
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if($pubkey == $s_pubkey) {
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$addresses[] = $s_address;
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}
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}
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$result[$pubkey] = $addresses;
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}
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return $result;
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}
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/*
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* Input array of type array[pubkey] = array("address1", "address2", ...)
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* Output array of type array[pubkey] = "address"
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* Removes pubkeys that do not have an active address
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* For those with multiple addresses it checks if one of them is not a IP address and then assumes it to be the (primary) domain of the server //TODO: not ideal, but works for now
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*/
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function reduce_addresses_of_pubkeys($pubkey_to_addresses_arr) {
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$result = array();
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foreach($pubkey_to_addresses_arr as $pubkey => $addresses_arr) {
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// print_r($addresses_arr);
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// echo($pubkey . " has count " . count($addresses_arr) . "." . PHP_EOL);
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// has active addresses?
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if(count($addresses_arr) != 0) {
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// has only one active address?
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if(count($addresses_arr) == 1) {
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// add only entry to result
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$result[$pubkey] = $addresses_arr[0];
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}
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else{
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// has more than one active address
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$found_domain = false;
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foreach($addresses_arr as $address) {
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$without_proto = explode("//", $address)[1];
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// has no domain be found yet?
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if(!$found_domain) {
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// (bool)ip2long returns 1 (true) if valid IP //TODO: Does this handle IPv6?
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if(!(bool)ip2long($without_proto)) {
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$found_domain = true;
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// add first found domain to result
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$result[$pubkey] = $address;
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}
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}
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}
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// has no domain been found?
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if(!$found_domain) {
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// them simply add first entry
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$result[$pubkey] = $addresses_arr[0];
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}
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}
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}
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}
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return $result;
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}
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/*
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* TODO: Description
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*/
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function assign_rooms_to_address_assignments($addr_assignments_arr, $rooms_arr) {
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$result = array();
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foreach($addr_assignments_arr as $pubkey => $address) {
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$result[$pubkey] = array($address, $rooms_arr[$address]);
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/*
|
|
* TODO: Description
|
|
*/
|
|
function generate_join_links($room_assignments_arr) {
|
|
$result = array();
|
|
// for each server a.k.a. public key do
|
|
foreach($room_assignments_arr as $pubkey => $room_assignment) {
|
|
// for every room do
|
|
foreach($room_assignment[1] as $room_array) {
|
|
// info:
|
|
// $room_array = array(
|
|
// "token" => bla,
|
|
// "name" => Blabla,
|
|
// "active_users" => -1,
|
|
// "description" => Blabla bla bla
|
|
//);
|
|
$server = $room_assignment[0];
|
|
$join_link = $server . "/" . $room_array["token"] . "?public_key=" . $pubkey;
|
|
|
|
$result[] = $join_link;
|
|
}
|
|
}
|
|
$result = array_unique($result); // shouldn't be necessary
|
|
sort($result);
|
|
|
|
return $result;
|
|
}
|
|
|
|
/*
|
|
* Writes HTML table with the following info:
|
|
* Token + shortened pubkey | Name | Description | Users | View Links(?) | Join URL
|
|
*/
|
|
function get_table_html($room_assignments_arr) {
|
|
$shortened_pubkey_length = 4; // shorten pubkey to this length to make room token unique
|
|
// contains the info for each line of the table
|
|
$ordered_table_elements = array();
|
|
// for each server a.k.a. public key do
|
|
foreach($room_assignments_arr as $pubkey => $room_assignment) {
|
|
$server = $room_assignment[0];
|
|
$shortened_pubkey = substr($pubkey, 0, $shortened_pubkey_length); // first X chars of pubkey
|
|
// for every room do
|
|
foreach($room_assignment[1] as $room_array) {
|
|
// info:
|
|
// $room_array = array(
|
|
// "token" => bla,
|
|
// "name" => Blabla,
|
|
// "active_users" => -1,
|
|
// "description" => Blabla bla bla
|
|
//);
|
|
|
|
$join_link = $server . "/" . $room_array["token"] . "?public_key=" . $pubkey;
|
|
$identifier = $room_array["token"] . "+" . $shortened_pubkey;
|
|
|
|
$info_array = array(
|
|
"name" => $room_array["name"],
|
|
"description" => $room_array["description"],
|
|
"active_users" => $room_array["active_users"],
|
|
"join_link" => $join_link
|
|
);
|
|
$ordered_table_elements[$identifier] = $info_array;
|
|
}
|
|
}
|
|
|
|
// sorting that keeps index association, sort by index
|
|
ksort($ordered_table_elements, SORT_STRING | SORT_FLAG_CASE);
|
|
// print_r($ordered_table_elements);
|
|
|
|
$table_lines = array();
|
|
foreach($ordered_table_elements as $id => $content) {
|
|
// https://1.2.3.4:56789/token?public_key=0123456789abcdef
|
|
$join_link = $content["join_link"];
|
|
|
|
// get preview links
|
|
$exploded = explode("/", $join_link); // https: + "" + 1.2.3.4:56789 + token?public_key=0123456789abcdef
|
|
$server = $exploded[0] . "//" . $exploded[2];
|
|
$token = explode("?", $exploded[3])[0];
|
|
$preview_link = $server . "/r/" . $token . "/";
|
|
$preview_link_alt = $server . "/view/room/" . $token;
|
|
|
|
// test if preview_links are 404
|
|
if(!url_is_reachable($preview_link)) {
|
|
if(!url_is_reachable($preview_link_alt)) {
|
|
$preview_link = null; // $preview_link and $preview_link_alt not reachable
|
|
}
|
|
else {
|
|
$preview_link = $preview_link_alt; // $preview_link_alt reachable
|
|
}
|
|
}
|
|
|
|
// test if active_users is valid
|
|
$active_users = $content["active_users"];
|
|
/*if($active_users == -1) {
|
|
$active_users = "N/A"; // this breaks sortTable()
|
|
}*/
|
|
|
|
$line =
|
|
" <tr>" . PHP_EOL .
|
|
" <td class=\"td_identifier\">" . $id . "</td>" . PHP_EOL .
|
|
" <td>" . $content["name"] . "</td>" . PHP_EOL .
|
|
" <td>" . $content["description"] . "</td>" . PHP_EOL .
|
|
" <td class=\"td_users\">" . $active_users . "</td>" . PHP_EOL .
|
|
" <td><a href=\"" . $preview_link . "\">" . $preview_link . "</a></td>" . PHP_EOL .
|
|
" <td class=\"td_join_url\">" . substr($join_link, 0, 32) . "..." . PHP_EOL .
|
|
" <button class=\"copy_button\" onclick=\"copyToClipboard('" . $join_link . "')\">Copy</button>" . PHP_EOL .
|
|
" </td>" . PHP_EOL .
|
|
" </tr>" . PHP_EOL;
|
|
$table_lines[] = $line;
|
|
}
|
|
|
|
// prefix
|
|
$prefix =
|
|
"<h1 id=\"headline\">Session Communities</h1>" . PHP_EOL .
|
|
"<table id=\"tbl_communities\">" . PHP_EOL .
|
|
" <tr>" . PHP_EOL .
|
|
" <th onclick=\"sortTable(0)\" id=\"th_identifier\">Identifier</th>" . PHP_EOL .
|
|
" <th onclick=\"sortTable(1)\" id=\"th_name\">Name</th>" . PHP_EOL .
|
|
" <th onclick=\"sortTable(2)\" id=\"th_description\">Description</th>" . PHP_EOL .
|
|
" <th onclick=\"sortTable(3)\" id=\"th_users\">Users</th>" . PHP_EOL .
|
|
" <th onclick=\"sortTable(4)\" id=\"th_preview\">Preview</th>" . PHP_EOL .
|
|
" <th onclick=\"sortTable(5)\" id=\"th_join_url\">Join URL</th>" . PHP_EOL .
|
|
" </tr>" . PHP_EOL;
|
|
|
|
// suffix
|
|
// span over 6 columns (id, name, description, users, preview, join link)
|
|
//$span_count = 6;
|
|
$suffix =
|
|
"</table>" . PHP_EOL .
|
|
"<table id=\"tbl_footer\">" . PHP_EOL .
|
|
" <tr>" . PHP_EOL .
|
|
//" <td id=\"td_summary\" colspan=\"" . $span_count . "\">" . count($table_lines) . " unique Session Communities have been found.</td>" . PHP_EOL .
|
|
" <td id=\"td_summary\">" . count($table_lines) . " unique Session Communities have been found.</td>" . PHP_EOL .
|
|
" </tr>" . PHP_EOL .
|
|
" <tr>" . PHP_EOL .
|
|
//" <td id=\"td_last_checked\" colspan=\"" . $span_count . "\">Last checked X minutes ago.</td>" . PHP_EOL .
|
|
" <td id=\"td_last_checked\">Last checked X minutes ago.</td>" . PHP_EOL .
|
|
" </tr>" . PHP_EOL .
|
|
"</table>" . PHP_EOL;
|
|
|
|
// concatenate html
|
|
$html = $prefix;
|
|
foreach($table_lines as $line) {
|
|
$html = $html . $line;
|
|
}
|
|
$html = $html . $suffix;
|
|
|
|
return $html;
|
|
}
|
|
|
|
/*
|
|
* Build valid HTML5 page from provided table html
|
|
*/
|
|
function create_html_page_from_table($table_html, $title, $timestamp) {
|
|
$pre =
|
|
"<!DOCTYPE html>" . PHP_EOL .
|
|
"<html lang=\"en\">" . PHP_EOL .
|
|
" <head>" . PHP_EOL .
|
|
" <link rel=\"icon\" type=\"image/svg+xml\" href=\"favicon.svg\" sizes=\"any\">" . PHP_EOL .
|
|
" <link rel=\"stylesheet\" href=\"styles.css\">" . PHP_EOL .
|
|
" <script src=\"script.js\" defer></script>" . PHP_EOL .
|
|
" <title>" . $title . "</title>" . PHP_EOL .
|
|
" </head>" . PHP_EOL .
|
|
" <body onload=\"setLastChecked(" . $timestamp . ")\">" . PHP_EOL;
|
|
$post =
|
|
" </body>" . PHP_EOL .
|
|
"</html>" . PHP_EOL;
|
|
|
|
$html5 = $pre . $table_html . $post;
|
|
|
|
return $html5;
|
|
}
|
|
|
|
?>
|