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='0.1.5';
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)) {
	$conf=@parse_ini_file(INIFP,false,INI_SCANNER_RAW);
	if ($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 “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 “Account address” is not a valid Mastodon account';
} else {
	$_GET['acctock']='';
}

$hostok=false;
if (isset($_GET['host'])) {
	if (strlen($_GET['host'])>MAXHOSTLEN) {
		$_GET['host']='';
		$errors[]='Value for “Server domain” is too long';
	}
	$_GET['host']=trim($_GET['host']);
	if ($_GET['host']!='' && !validhostname($_GET['host']))
		$errors[]='Value for “Server domain” is not a valid hostname';
	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>{$usname}</title>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">
<meta name=\"description\" content=\"A tool to check if a Mastodon account is moderated by a Mastodon server\">
<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no\">
<meta property=\"og:image\" content=\"imgs/ogimage.png\">
<link rel=\"icon\" type=\"image/png\" href=\"imgs/icon-16.png\" sizes=\"16x16\">
<link rel=\"icon\" type=\"image/png\" href=\"imgs/icon-32.png\" sizes=\"32x32\">
<link rel=\"icon\" type=\"image/png\" href=\"imgs/icon-192.png\" sizes=\"192x192\">
<link rel=\"icon\" type=\"image/png\" href=\"imgs/icon-512.png\" sizes=\"512x512\">
<link rel=\"apple-touch-icon-precomposed\" href=\"imgs/icon-180.png\">
<link rel=\"stylesheet\" type=\"text/css\" href=\"css/main.css?v={$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 Mastodon account is moderated (<a href=\"https://docs.joinmastodon.org/admin/moderation/#limit-user\">silenced, aka “limited”</a>, and-or <a href=\"https://docs.joinmastodon.org/admin/moderation/#suspend-user\">suspended, aka “blocked”</a>) by a Mastodon server (aka “instance”).</p>
<p>Since an account can be reported as moderated by a Mastodon server even when the server is moderating the whole account’s domain, {$usname} also tries to detect if this is the case, and tells about it.</p>
<p>To check if an account is moderated by the given server, {$usname} tries to use the server’s <a href=\"https://docs.joinmastodon.org/methods/accounts/#lookup\">«/api/v1/accounts/lookup» API endpoint</a>, which is public and was introduced in Mastodon v3.4.0; to check if the server is moderating the whole account’s domain, {$usname} tries to use the server’s <a href=\"https://docs.joinmastodon.org/methods/instance/#domain_blocks\">«/api/v1/instance/domain_blocks» API endpoint</a>, which is not always set to public by the server’s admins, and was introduced in Mastodon v4.0.0. If it can’t use one or both of these endpoints, it tells.</p>
<p>{$usname} does not use cookies or Javascript and does not store any data about you anywhere.</p>
<p>You can find {$usname}’s code <a href=\"".SREPO."\">here</a>, and you can contact me on Mastodon <a href=\"https://puntarella.party/@umpi\">here</a>.</p>
</div>
<div class=\"horsep\"></div>
".$errors."
<h2>Check</h2>
<form method=\"get\" id=\"mainform\" name=\"mainform\">
<div class=\"inputdiv\"><label for=\"acctock\">Account address</label><input type=\"text\" id=\"acctock\" name=\"acctock\" class=\"input\" placeholder=\"Example: paperino@paperopoli.net\" value=\"{$_GET['acctock']}\" maxlength=\"".MAXACCLEN."\" required></div>
<div class=\"inputdiv\"><label for=\"host\">Mastodon server (“instance”) domain</label><input type=\"text\" id=\"host\" name=\"host\" class=\"input\" placeholder=\"Example: topolinia.net\" value=\"{$_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']))
		$context['http']['proxy']=$conf['proxy'];
	$http_response_header=null;
	$context=stream_context_create($context);
	$hhost=htmlentities($_GET['host']);
	$url=$_GET['host'].'/api/v1/instance';
	$hurl=htmlentities($url);
	$res=@file_get_contents('https://'.$url,false,$context);
	//echo preprint($http_response_header);
	if (isset($http_response_header))
		$rl=ckratelimit($http_response_header,'echofun',true,false);
	if ($res===false) {
		echo "<div class=\"error\">Error: could not connect to «{$hhost}».</div>\n";
	} elseif (is_array($http_response_header) && gethttpcode($http_response_header)!='200') {
		echo "<div class=\"error\">Error: «{$hhost}» seems not to be running Mastodon.</div>\n";
	} elseif (null===$res=@json_decode($res,true)) {
		echo "<div class=\"error\">Error: «{$hurl}» returned data which could not be parsed as JSON (".json_last_error().': '.json_last_error_msg().").</div>\n";
	} elseif (isset($res['error'])) {
		echo "<div class=\"error\">Error: «{$hurl}» replied with this error message: «".htmlentities($res['error'])."».</div>\n";
	} elseif (!isset($res['version'])) {
		echo "<div class=\"error\">Error: «{$hurl}» returned data in an unexpected format.</div>\n";
	} elseif (preg_replace('#[^\d\.].*#','',$res['version'])<'3.4.0') {
		echo "<div class=\"error\">Error: «{$hhost}» is running a version of Mastodon that is earlier than 3.4.0 («{$res['version']}»).</div>\n";
	} else {
		$acchost=preg_replace('#^@?[^@]+@(.*)$#','$1',$_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,'echofun',true,false);
		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 silenced 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 not moderated (silenced or suspended) by «{$_GET['host']}».";
		} else {
			$acchostck="{$usname} could not detect if the domain of the account to check, «{$acchost}», is moderated (silenced or suspended) by «{$_GET['host']}».";
		}
		$acchostck=htmlentities($acchostck);
		$http_response_header=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))
			$rl=ckratelimit($http_response_header,'echofun',true,false);
		if ($res===false) {
			echo "<div class=\"error\">Error: could not connect to «{$hhost}».</div>\n";
		} elseif (null===$res=@json_decode($res,true)) {
			echo "<div class=\"error\">Error: «{$hurl}» returned data which could not be parsed as JSON (".json_last_error().': '.json_last_error_msg().").</div>\n";
		} elseif (isset($res['error'])) {
			if ($res['error']=='Record not found')
				echo "<div class=\"neutral\">Server «{$hhost}» doesn’t know «{$hacctock}» account.<br><br>{$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';
			$out.=" silenced by «{$hhost}»<br>\n«{$hacctock}» ";
			(isset($res['suspended']) && $res['suspended']) ? $out.='is' : $out.='is not';
			$out.=" suspended by «{$hhost}»<br><br>\n{$acchostck}</div>\n";
			echo $out;
		}
	}
	if (is_array($rl) && @file_put_contents($rlfp,$rl['remaining']."\n".($rl['secstoreset']+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."\">".SNAME." ".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]);
}

function echofun($msg) {
	echo $msg;
}

?>