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Editing: init2.php

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<?php
/*****************************************************************
 *  OpenAI helper  v1.1  (Aug‑2025)
 *  path:  /openai/init.php
 *****************************************************************/

declare(strict_types=1);

/* ---- constants ------------------------------------------- */
const AI_COOKIE = 'openai_key';
const AI_SECRET = 'openai-shared-v1';
const AI_TTL    = 30 * 24 * 3600;           // 30 days

/* ---- cookie domain --------------------------------------- */
$AI_ROOT = (static function (): string {
    $h = $_SERVER['HTTP_HOST'] ?? '';
    if (!filter_var($h, FILTER_VALIDATE_IP) &&
        preg_match('/([a-z0-9-]+\.[a-z]{2,})$/i', $h, $m)) {
        return '.'.$m[1];
    }
    return '';
})();

/* ---- crypto ---------------------------------------------- */
function ai_enc(string $v): string {
    $m='aes-128-ctr'; $k=substr(hash('sha256',AI_SECRET,true),0,16);
    $iv=random_bytes(openssl_cipher_iv_length($m));
    return base64_encode(openssl_encrypt($v,$m,$k,0,$iv)."::{$iv}");
}
function ai_dec(string $c): string {
    [$ct,$iv]=explode('::',base64_decode($c),2)+['',''];
    $m='aes-128-ctr'; $k=substr(hash('sha256',AI_SECRET,true),0,16);
    return openssl_decrypt($ct,$m,$k,0,$iv) ?: '';
}

/* ---- key helpers ----------------------------------------- */
function ai_has_key(): bool   { return isset($_COOKIE[AI_COOKIE]) && ai_dec($_COOKIE[AI_COOKIE]); }
function ai_get_key(): string { return ai_has_key() ? ai_dec($_COOKIE[AI_COOKIE]) : ''; }

/* ---- global message -------------------------------------- */
$AI_MSG = '';    // populated on bad key

/* ---- save / delete key ----------------------------------- */
function ai_handle_key_post(): void
{
    global $AI_ROOT, $AI_MSG;
    if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['save_key'])) {
        /* always drop any stale cookie first */
        setcookie(AI_COOKIE,'',time()-3600,'/',$AI_ROOT,isset($_SERVER['HTTPS']),true);

$raw = trim($_POST['api_key'] ?? '');
        if ($raw === '') {
            $AI_MSG = 'API key empty';
            return;
        }
        /* quick validation */
        $ctx = stream_context_create(['http'=>[
            'method'=>'GET',
            'header'=>"Authorization: Bearer $raw\r\n",
            'timeout'=>6
        ]]);
        if (@file_get_contents('https://api.openai.com/v1/models', false, $ctx)) {
            setcookie(AI_COOKIE, ai_enc($raw), time() + AI_TTL, '/', $AI_ROOT, isset($_SERVER['HTTPS']), true);
            header('Location: ' . $_SERVER['REQUEST_URI']); exit;
        }
        $AI_MSG = '❌ Invalid API key (or network error).';
        return;
    }

if (isset($_GET['logout'])) {
        setcookie(AI_COOKIE, '', time() - 3600, '/', $AI_ROOT, isset($_SERVER['HTTPS']), true);
        header('Location: ' . $_SERVER['PHP_SELF']); exit;
    }
}

/* ---- key bar --------------------------------------------- */
function ai_render_key_bar(array $extraModels = []): void
{
    global $AI_MSG;
    $models = array_merge(['gpt-3.5-turbo','gpt-4o-mini','gpt-4'],$extraModels);
?>
<div style="background:#121720;color:#fff;padding:.9rem 1.2rem;border-radius:26px;
            display:flex;gap:1rem;flex-wrap:wrap;align-items:center">
<?php if(!ai_has_key()): ?>
  <form method="post" style="display:flex;gap:.7rem;flex-wrap:wrap;align-items:center;height:fit-content" autocomplete="off">
    <input type="password" name="api_key" placeholder="Paste your OpenAI key…" required
           style="border:none;border-radius:10px;padding:0.55rem 1rem;font-size:.95rem;height:42px;width:180px;box-sizing:border-box">
   
  <button name="save_key"
         style="background:#004cff;color:#fff;border:none;border-radius:10px;padding:0 .9rem;height:42px;font-weight:600">
          Save Key
  </button>
    <a href="https://platform.openai.com/account/api-keys" target="_blank"
      style="align-self:center;font-size:.9rem;color:#5af287;text-decoration:none">Get an API key ↗</a>
  </form>
  <?php if($AI_MSG): ?><span style="color:#e24d4b;font-weight:600"><?=$AI_MSG?></span><?php endif; ?>
<?php else: ?>
  <span style="display:flex;align-items:center;gap:.4ch;font-weight:600;font-size:.95rem">
     Connected&nbsp;to&nbsp;OpenAI
     <button onclick="location='?logout=1'" title="Delete key"
             style="background:none;border:none;color:#e24d4b;font-size:1.1rem;cursor:pointer">×</button>
  </span>
  <select id="modelSel"
          style="background:#1e2535;color:#fff;border:none;border-radius:8px;padding:.55rem .85rem;font-size:1rem">
    <?php foreach($models as $m) echo "<option>$m</option>"; ?>
  </select>
  <a href="https://platform.openai.com/account/usage" target="_blank"
     style="color:#5af287;font-size:.9rem;text-decoration:none;align-self:center">Check usage ↗</a>
<?php endif; ?>
</div>
<script>
document.getElementById('modelSel')?.addEventListener('change',e=>{
  document.querySelectorAll('input[name=model]').forEach(i=>i.value=e.target.value);
});
</script>
<?php }

/* ---- chat wrapper ---------------------------------------- */
function ai_chat(string $prompt, array $opts = []): string
{
    $key = ai_get_key();
    if (!$key) return '';

$body = [
        'model'       => $opts['model']       ?? 'gpt-3.5-turbo',
        'messages'    => [['role'=>'user','content'=>$prompt]],
        'temperature' => $opts['temperature'] ?? 0.7,
        'max_tokens'  => $opts['max_tokens']  ?? 800,
    ];
    $ch = curl_init('https://api.openai.com/v1/chat/completions');
    curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER=>1,CURLOPT_POST=>1,
        CURLOPT_HTTPHEADER=>['Authorization: Bearer '.$key,'Content-Type: application/json'],
        CURLOPT_POSTFIELDS=>json_encode($body),CURLOPT_TIMEOUT=>60]);
    $raw = curl_exec($ch); curl_close($ch);
    return $raw ? (json_decode($raw,true)['choices'][0]['message']['content'] ?? '') : '';
}

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Editing: init2.php

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