授权与许可

FBEngineConfig *config = [[FBEngineConfig alloc] init];
config.licenseToken = @"/* 许可证 token、{token} JSON，或 .lic 全文 */";
self.beautyEffectEngine = [FBBeautyEffectEngine createEngineWithConfig:config];

BeautyEffectEngine.EngineConfig config = new BeautyEffectEngine.EngineConfig();
config.licenseToken = "/* 许可证 token、{token} JSON，或 .lic 全文 */";
mBeautyEngine = new BeautyEffectEngine(this, config);

facebetter::EngineConfig config;
config.license_token = "/* 许可证 token、{token} JSON，或 .lic 全文 */";
config.resource_path = "/path/to/resource.fbd";
auto engine = facebetter::BeautyEffectEngine::Create(config);

config.appId = "your appId";
config.appKey = "your appKey";

import { BeautyEffectEngine, EngineConfig } from 'facebetter';

// 响应可以是纯 token，也可以是上游返回的 JSON 原文（含 token 字段）
const licenseToken = await fetch('/api/facebetter/auth', {
  method: 'POST',
}).then((r) => {
  if (!r.ok) throw new Error(`auth failed: ${r.status}`);
  return r.text();
});

const engine = new BeautyEffectEngine(new EngineConfig({ licenseToken }));
await engine.init();

import { createHmac, randomBytes } from 'node:crypto';

const AUTH_URL = 'https://facebetter.pixpark.net/facebetter/v2/auth';

app.post('/api/facebetter/auth', async (req, res) => {
  const appId = process.env.FB_APP_ID;
  const appKey = process.env.FB_APP_KEY;
  if (!appId || !appKey) {
    res.status(500).json({ error: 'FB_APP_ID / FB_APP_KEY not configured' });
    return;
  }

  const nonce = randomBytes(16).toString('hex');
  const timestamp = Math.floor(Date.now() / 1000);
  const platform = 'web';
  // 签名串：v2|{app_id}|{timestamp}|{nonce}|{platform}
  const payload = `v2|${appId}|${timestamp}|${nonce}|${platform}`;
  const hmac = createHmac('sha256', appKey).update(payload).digest('hex');

  const upstream = await fetch(AUTH_URL, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      app_id: appId,
      hmac_signature: hmac,
      timestamp,
      nonce,
      platform,
      user_agent: req.headers['user-agent'] || '',
    }),
  });

  // 原样转发给前端，作为 EngineConfig.licenseToken
  res.status(upstream.status).send(await upstream.text());
});