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guarded to /htdocs

/api/stt.php

<?php
declare(strict_types=1);

header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store');

function get_client_key(): string {
  $h = getallheaders();
  if (!empty($h['X-OpenAI-Key'])) return trim((string)$h['X-OpenAI-Key']);
  if (!empty($h['x-openai-key'])) return trim((string)$h['x-openai-key']);
  return '';
}

function openai_key(): string {
  $k = get_client_key();
  if ($k !== '') return $k;

$env = trim((string)(getenv('OPENAI_API_KEY') ?: ''));
  if ($env !== '') return $env;

$candidates = [
    dirname(__DIR__) . '/_inc/secrets.php',
    dirname(__DIR__) . '/../_inc/secrets.php',
    __DIR__ . '/secrets.php',
  ];

foreach ($candidates as $file) {
    if (!is_file($file)) continue;

$data = require $file;
    if (is_array($data)) {
      foreach (['OPENAI_API_KEY', 'openai_api_key', 'api_key'] as $key) {
        $value = trim((string)($data[$key] ?? ''));
        if ($value !== '') return $value;
      }
    }

if (defined('OPENAI_API_KEY')) {
      $constant = trim((string)constant('OPENAI_API_KEY'));
      if ($constant !== '') return $constant;
    }
  }

return '';
}

function json_out(array $data, int $code=200): void {
  http_response_code($code);
  echo json_encode($data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
  exit;
}

$apiKey = openai_key();
if ($apiKey === '') json_out(['ok'=>false,'error'=>'Missing OPENAI_API_KEY'], 500);

if (empty($_FILES['file']) || !is_uploaded_file($_FILES['file']['tmp_name'])) {
  json_out(['ok'=>false,'error'=>'Missing upload file'], 400);
}

$tmp   = $_FILES['file']['tmp_name'];
$name  = $_FILES['file']['name'] ?? 'audio.webm';
$model = trim((string)(getenv('OPENAI_STT_MODEL') ?: 'gpt-4o-mini-transcribe'));

$ch = curl_init('https://api.openai.com/v1/audio/transcriptions');
$post = [
  'model' => $model,
  'file'  => new CURLFile($tmp, 'audio/webm', $name),
];

curl_setopt_array($ch, [
  CURLOPT_POST => true,
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_HTTPHEADER => [
    'Authorization: Bearer ' . $apiKey,
  ],
  CURLOPT_POSTFIELDS => $post,
  CURLOPT_TIMEOUT => 90,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_ENCODING => '',
]);

$resp = curl_exec($ch);
$err  = curl_error($ch);
$code = (int)curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
curl_close($ch);

if ($resp === false) json_out(['ok'=>false,'error'=>'cURL error: '.$err], 500);

$j = json_decode($resp, true);
if (!is_array($j)) json_out(['ok'=>false,'error'=>'Bad JSON from OpenAI','raw'=>mb_substr($resp,0,300)], 500);

if ($code < 200 || $code >= 300) {
  $msg = $j['error']['message'] ?? ('OpenAI HTTP '.$code);
  json_out(['ok'=>false,'error'=>(string)$msg], 500);
}

$text = (string)($j['text'] ?? '');
json_out(['ok'=>true,'text'=>trim($text)]);

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