以 API 提供的 Euphona 引擎

1：创建文件并获取上传目标

curl -X POST https://api.euphonaai.com/v1/files \
  -H "Authorization: Bearer $EUPHONA_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{"filename":"take-07.wav","bytes":58210044,"content_type":"audio/wav"}'

{
  "id": "file_8Kd2mQ...",
  "object": "file",
  "status": "awaiting_upload",
  "upload": { "protocol": "...", "url": "https://files.euphonaai.com/...", "expires_at": "..." }
}

2：把数据发送到 files.，而不是发给我们

# 读取 upload.protocol：不要假定它的值。可续传机制是接口约定内部的
# 实现选择，可能在不升级主版本号的情况下改变，这正是它是一个字段而不是一段文档的原因。

3：观察任务

curl -N https://api.euphonaai.com/v1/jobs/job_4Rb.../events \
  -H "Authorization: Bearer $EUPHONA_API_KEY"

event: job.progress
data: {"status":"analyzing","stage":"analyze","progress":{"fraction":0.4}}

event: job.completed
data: {"status":"succeeded","result":{...},"metering":{"pool":"payg","charged_minutes":3.4}}

4：以任务本身为准进行核对

curl https://api.euphonaai.com/v1/jobs/job_4Rb... \
  -H "Authorization: Bearer $EUPHONA_API_KEY"

{"id":"job_4Rb...","status":"succeeded","result":{...},
 "metering":{"pool":"payg","charged_minutes":3.4}}

# 任务资源是状态机当前的真实状态：无论流中显示了什么、漏掉了什么，
# 在据此行动之前都要重新读取它。SSE 连接断开后会带着
# Last-Event-ID 重新连接，不会丢失任何内容。

验证一次投递（Node.js）

import { createHmac, timingSafeEqual } from "node:crypto";

// 请原样传入收到的原始请求体：解析后再序列化的 JSON
// 不是被签名的那条消息。
export function verifyEuphonaSignature(rawBody, header, secret, now = Date.now() / 1000) {
  const parts = header.split(",").map((part) => part.trim().split("="));
  const t = Number(parts.find(([key]) => key === "t")?.[1]);
  const signatures = parts.filter(([key]) => key === "v1").map(([, value]) => value);
  if (!Number.isFinite(t) || Math.abs(now - t) > 300) return false;
  const expected = createHmac("sha256", secret).update(`${t}.${rawBody}`).digest();
  return signatures.some((value) => {
    const given = Buffer.from(value, "hex");
    return given.length === expected.length && timingSafeEqual(given, expected);
  });
}