Jones
/
acck


			
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							<?php

/*
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU 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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

require 'lib/validhostname.php';
require 'lib/ckratelimit.php';
require 'lib/ght.php';

const SNAME='acck';
const SVERS='0.1.7';
const SREPO='https://git.lattuga.net/jones/acck';
const MAXACCLEN=30+253+2;
const MAXHOSTLEN=253;
const INIFP='sec/conf.ini';

$usname=ucfirst(SNAME);
$timeout=5;
$cjr=rand(0,999999);

header('Content-Language: en');

if (file_exists(INIFP)) {
	$conf=@parse_ini_file(INIFP,false,INI_SCANNER_RAW);
	(isset($conf['use_proxy_with'])) ? $conf['use_proxy_with']=explode(',',$conf['use_proxy_with']) : $conf['use_proxy_with']=null;
	if ($conf===false)
		die('Configuration file «'.INIFP."» exists but {$usname} could not open it.");
}

$errors=[];

if (isset($_GET['acctock'])) {
	if (strlen($_GET['acctock'])>MAXACCLEN) {
		$_GET['acctock']='';
		$errors[]='Value for «Fediverse account address» is too long';
	}
	$_GET['acctock']=trim($_GET['acctock']);
	if ($_GET['acctock']!='' && preg_match('#^@?[0-9a-zA-Z_]+(@[a-z0-9.-]{4,253})?$#',$_GET['acctock'])!==1)// todo: make it better, like split ecc.
		$errors[]='Value for «Fediverse account address» is not valid';
} else {
	$_GET['acctock']='';
}

$hostok=false;
if (isset($_GET['host'])) {
	if (strlen($_GET['host'])>MAXHOSTLEN) {
		$_GET['host']='';
		$errors[]='Value for «Mastodon instance domain» is too long';
	}
	$_GET['host']=trim($_GET['host']);
	if ($_GET['host']!='' && !validhostname($_GET['host']))
		$errors[]='Value for «Mastodon instance domain» is not valid';
	else
		$hostok=true;
} else {
	$_GET['host']='';
}

$rl=['remaining'=>400,'restime'=>0];
if ($hostok) {
	$rlfp='sec/'.$_GET['host'].'.rl.state';
	if (file_exists($rlfp)) {
		$buf=@file($rlfp,FILE_IGNORE_NEW_LINES);
		if ($buf===false)
			die('Could not open rate limiting state file.');
		if (count($buf)!=2 || preg_match('#^\d+$#',$buf[0])!==1 || preg_match('#^\d+$#',$buf[1])!==1)
			die('Malformed rate limiting state file.');
		$rl=['remaining'=>$buf[0]+0,'restime'=>$buf[1]+0];
	}
}
$now=time();
if ($rl['remaining']<=10 && $now<=$rl['restime'])// ten to leave a margin for "many people using it" and to account for 3 calls to host's endpoints
	$errors[]="This {$usname} instance has reached rate limit on «{$_GET['host']}», please wait at least ".ght($rl['restime']-$now,null,0).'.';

if (count($errors)>0)
	$errors='<div class="warning">There are some errors<ul><li>'.implode('</li><li>',$errors).'</li></ul></div><div class="horsep"></div>';
else
	$errors='';

echo "<!DOCTYPE HTML>
<html lang=\"en\">
<head>
<title>{$usname}</title>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">
<meta name=\"description\" content=\"A tool to check if a fediverse account is moderated by a Mastodon instance\">
<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no\">
<meta property=\"og:image\" content=\"imgs/ogimage.png\">
<link rel=\"icon\" type=\"image/png\" href=\"imgs/icon-16.png\" sizes=\"16x16\">
<link rel=\"icon\" type=\"image/png\" href=\"imgs/icon-32.png\" sizes=\"32x32\">
<link rel=\"icon\" type=\"image/png\" href=\"imgs/icon-192.png\" sizes=\"192x192\">
<link rel=\"icon\" type=\"image/png\" href=\"imgs/icon-512.png\" sizes=\"512x512\">
<link rel=\"apple-touch-icon-precomposed\" href=\"imgs/icon-180.png\">
<link rel=\"stylesheet\" type=\"text/css\" href=\"css/main.css?v={$cjr}\">
</head>
<body>
<div id=\"main\">
<h1>{$usname}</h1>
<div class=\"normtext\">
<p class=\"firstp\">Hello, this is {$usname}, a tool to easily check if a fediverse account is <a href=\"https://docs.joinmastodon.org/admin/moderation/#limit-user\">limited</a> (AKA «silenced») and-or <a href=\"https://docs.joinmastodon.org/admin/moderation/#suspend-user\">suspended</a> (AKA «blocked») by a Mastodon instance.</p>
<p>Since an account is reported as limited and-or suspended by a Mastodon instance even when that instance has limited and-or suspended the whole account’s instance, {$usname} also tries to detect if this is the case, and tells about it.</p>
<!-- <p>To check if an account is moderated by the given server, {$usname} tries to use the server’s <a href=\"https://docs.joinmastodon.org/methods/accounts/#lookup\">«/api/v1/accounts/lookup» API endpoint</a>, that is public and was introduced in Mastodon v3.4.0; to check if the server is moderating the whole account’s domain, {$usname} tries to use the server’s <a href=\"https://docs.joinmastodon.org/methods/instance/#domain_blocks\">«/api/v1/instance/domain_blocks» API endpoint</a>, that is not always set to public by the server’s admins, and was introduced in Mastodon v4.0.0. If it can’t use one or both of these endpoints, it tells.</p> -->
<p>{$usname} does not use cookies or Javascript and does not store any data about you anywhere.</p>
<p>You can find {$usname}’s code <a href=\"".SREPO."\">here</a>, and you can contact its developer on Mastodon <a href=\"https://puntarella.party/@j0nes\">here</a>.</p>
</div>
".$errors."
<form method=\"get\" id=\"mainform\" name=\"mainform\">
<div class=\"inputdiv\"><label for=\"acctock\">Fediverse account address</label><input type=\"text\" id=\"acctock\" name=\"acctock\" class=\"input\" placeholder=\"Example: DonaldDuck@duckburg.social\" value=\"{$_GET['acctock']}\" maxlength=\"".MAXACCLEN."\" required></div>
<div class=\"inputdiv\"><label for=\"host\">Mastodon instance domain</label><input type=\"text\" id=\"host\" name=\"host\" class=\"input\" placeholder=\"Example: mastodon.social\" value=\"{$_GET['host']}\" maxlength=\"".MAXHOSTLEN."\" required></div>
<div class=\"lastinputdiv\"><button type=\"submit\" id=\"button\" class=\"button\">Check</button></div>\n</form>\n";

if ($errors=='' && $_GET['acctock']!='' && $_GET['host']!='') {
	echo "<div class=\"horsep\"></div>\n";
	$context=[
		'http'=>[
			'method'=>'GET',
			'ignore_errors'=>true,
			'protocol_version'=>1.1,
			'user_agent'=>'Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/119.0',
			'timeout'=>5
		]
	];
	if (isset($conf['proxy']) && (is_null($conf['use_proxy_with']) || in_array(strtolower($_GET['host']),$conf['use_proxy_with'])))
		$context['http']['proxy']=$conf['proxy'];
	$context=stream_context_create($context);
	$hhost=htmlentities($_GET['host']);
	$acchost=preg_replace('#^@?[^@]+@(.*)$#','$1',$_GET['acctock']);
	if ($acchost==$_GET['acctock'] || $acchost=='')
		$acchost=$_GET['host'];
	$acchostck=false;
	$http_response_header=null;
	$url=$_GET['host'].'/api/v1/instance/domain_blocks';
	$hurl=htmlentities($url);
	$res=@file_get_contents('https://'.$url,false,$context);
	//echo preprint($http_response_header);
	if (isset($http_response_header))
		$rl=ckratelimit($http_response_header);
	if ($res!==false && is_array($http_response_header) && gethttpcode($http_response_header)=='200' && null!==$res=@json_decode($res,true)) {
		foreach ($res as $val) {
			if (isset($val['domain'],$val['severity']) && $val['domain']==$acchost) {
				if ($val['severity']=='silence')
					$acchostck="The whole domain of the account to check, «{$acchost}», is limited by «{$_GET['host']}».";
				elseif ($val['severity']=='suspend')
					$acchostck="The whole domain of the account to check, «{$acchost}», is suspended by «{$_GET['host']}».";
				else
					$acchostck="The whole domain of the account to check, «{$acchost}», is moderated by «{$_GET['host']}», but {$usname} could not detect the moderation severity.";
				break;
			}
		}
		if ($acchostck===false)
			$acchostck="The domain of the account to check, «{$acchost}», is neither limited nor suspended by «{$_GET['host']}».";
	} else {
		$acchostck="{$usname} could not detect if the domain of the account to check, «{$acchost}», is limited or suspended by «{$_GET['host']}».";
	}
	$acchostck=htmlentities($acchostck);
	$http_response_header=null;
	$httpcode=null;
	$url=$_GET['host'].'/api/v1/accounts/lookup?acct='.urlencode($_GET['acctock']);
	$hacctock=htmlentities($_GET['acctock']);
	$hurl=htmlentities($url);
	$res=@file_get_contents('https://'.$url,false,$context);
	//echo preprint($http_response_header);
	if (isset($http_response_header)) {
		$httpcode=gethttpcode($http_response_header);
		$rl=ckratelimit($http_response_header);
	}
	if ($res===false) {
		echo "<div class=\"error\">Error: could not connect to «{$hhost}».</div>\n";
	} elseif (isset($httpcode) && $httpcode!='200') {
		echo "<div class=\"error\">Error: «{$hurl}» returned an HTTP code that is different than «200»: <a href=\"https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/{$httpcode}\">{$httpcode}</a>.</div>\n";
	} elseif (null===$res=@json_decode($res,true)) {
		echo "<div class=\"error\">Error: «{$hurl}» returned data that could not be parsed as JSON (".json_last_error().': '.json_last_error_msg().").</div>\n";
	} elseif (isset($res['error'])) {
		if ($res['error']=='Record not found')
			echo "<div class=\"neutral\">«{$hhost}» does not know the «{$hacctock}» account.<br><br>{$acchostck}</div>\n";
		else
			echo "<div class=\"error\">Error: «{$hurl}» replied with this error message: «".htmlentities($res['error'])."».</div>\n";
	} elseif (!isset($res['id'])) {
		echo "<div class=\"error\">Error: «{$hurl}» returned data in an unexpected format.</div>\n";
	} else {
		$out="<div class=\"neutral\">\n«{$hacctock}» ";
		(isset($res['limited']) && $res['limited']) ? $out.='is' : $out.='is not';
		$out.=" limited by «{$hhost}».<br>\n«{$hacctock}» ";
		(isset($res['suspended']) && $res['suspended']) ? $out.='is' : $out.='is not';
		$out.=" suspended by «{$hhost}».<br>\n<br>\n{$acchostck}</div>\n";
		echo $out;
	}
	if (isset($rl['ok']) && $rl['ok'] && @file_put_contents($rlfp,$rl['remaining']."\n".($rl['sleep']+time())."\n")===false)
		echo "<div class=\"warning\">Warning: could not write to rate limit state file.</div>\n";
}

if (isset($conf['footer']))
	echo "<div id=\"almfooter\">{$conf['footer']}</div>\n";

echo "<div id=\"footer\"><a href=\"".SREPO."\">{$usname} ".SVERS."</a></div>
</div>
</body>
</html>\n";


function preprint($var) {
	return '<pre>'.print_r($var,true)."</pre>\n";
}

function gethttpcode($headers) {
	return preg_replace('#^[^ ]+ (\d+).*$#','$1',$headers[0]);
}

?>