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guarded to /htdocs

/api/tts.php

<?php
declare(strict_types=1);

header('Cache-Control: no-store');

function openai_key(): string {

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

$file = dirname(__DIR__) . '/_inc/secrets.php';
  if (is_file($file)) {
    $data = require $file;
    if (is_array($data) && !empty($data['OPENAI_API_KEY'])) {
      return trim((string)$data['OPENAI_API_KEY']);
    }
  }

return '';
}

function read_json(): array {
  $raw = file_get_contents('php://input') ?: '';
  $j = json_decode($raw, true);
  return is_array($j) ? $j : [];
}

$key = openai_key();

if ($key === '') {
  http_response_code(500);
  header('Content-Type: application/json');
  echo json_encode(['ok'=>false,'error'=>'Missing OPENAI_API_KEY']);
  exit;
}

$in = read_json();
$text = trim((string)($in['text'] ?? ''));

if ($text === '') {
  http_response_code(400);
  header('Content-Type: application/json');
  echo json_encode(['ok'=>false,'error'=>'Missing text']);
  exit;
}

$voice = 'fable';

$body = json_encode([
  'model' => 'gpt-4o-mini-tts',
  'voice' => $voice,
  'format'=> 'mp3',
  'input' => $text
]);

$ch = curl_init('https://api.openai.com/v1/audio/speech');

curl_setopt_array($ch,[
  CURLOPT_POST => true,
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_HTTPHEADER => [
    'Authorization: Bearer '.$key,
    'Content-Type: application/json'
  ],
  CURLOPT_POSTFIELDS => $body
]);

$audio = curl_exec($ch);
$err = curl_error($ch);
$code = curl_getinfo($ch,CURLINFO_HTTP_CODE);

curl_close($ch);

if($audio === false){
  http_response_code(500);
  header('Content-Type: application/json');
  echo json_encode(['ok'=>false,'error'=>$err]);
  exit;
}

if($code < 200 || $code >= 300){
  http_response_code(500);
  header('Content-Type: application/json');
  echo json_encode(['ok'=>false,'error'=>'OpenAI HTTP '.$code]);
  exit;
}

header('Content-Type: audio/mpeg');
echo $audio;

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