Add Gmail+Email Worker hybrid mail path and private runtime config

Prefer Cloudflare Worker KV for verification codes with optional short IMAP
fallback disabled for private deploy; track config.json/.env for private repo.
Also add worker project, protocol mint backoff, and fail-fast Turnstile/mail
timeouts from batch runs.
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# Grok xAI 验证码 Email Worker
```
xAI 发信
→ Cloudflare Email Routing(catch-all)
→ 本 Worker:提取验证码写入 KV
→ (可选)forward 到 Gmail 作 IMAP 兜底
→ 注册机 HTTP GET Worker /code?to=alias@domain&key=...
```
## 1. 前置
- 域名 DNS 在 Cloudflare
- 开通 **Email Routing**
- 安装 Node:`npm i -g wrangler` 或用 `npx wrangler`
## 2. 创建 KV + 配置
```bash
cd cf-email-worker
npx wrangler login
npx wrangler kv namespace create GROK_MAIL_CODES
# 把返回的 id 填进 wrangler.toml 的 kv_namespaces.id
```
编辑 `wrangler.toml`,或在 Dashboard → Workers → Settings → Variables 设置:
| 变量 | 含义 |
|------|------|
| `CODE_API_KEY` | 注册机查询密钥(必填) |
| `GMAIL_FORWARD_TO` | 如 `you@gmail.com`,保留 IMAP 兜底 |
| `CODE_TTL_SEC` | KV 过期秒数,默认 600 |
```bash
npx wrangler secret put CODE_API_KEY
# 可选:也可用 vars;secret 更安全
```
## 3. 部署
```bash
npx wrangler deploy
# 记下 workers.dev 地址,例如:
# https://grok-xai-mail-codes.<subdomain>.workers.dev
```
## 4. Email Routing 绑定
Cloudflare Dashboard → **Email** → **Email Routing** → **Routing rules**:
1. 启用 Catch-all
2. Action = **Send to a Worker** → 选择 `grok-xai-mail-codes`
3. 域名 MX 按 Cloudflare 提示配置(若尚未)
> 若 catch-all 已转发到 Gmail,可改为:Worker 处理 + Worker 内 `GMAIL_FORWARD_TO` 再转到 Gmail。
> 不要只转 Gmail 而不进 Worker,否则没有秒级路径。
## 5. 注册机配置
`config.json`:
```json
{
"email_provider": "gmail",
"defaultDomains": "your-domain.com",
"gmail_imap_user": "you@gmail.com",
"gmail_imap_password": "app-password",
"gmail_worker_enabled": true,
"gmail_worker_url": "https://grok-xai-mail-codes.<subdomain>.workers.dev",
"gmail_worker_api_key": "与 CODE_API_KEY 相同",
"gmail_worker_timeout_sec": 25,
"gmail_worker_poll_interval": 0.4,
"gmail_imap_fallback": true
}
```
## 6. 自测
```bash
# 健康检查
curl -sS "https://YOUR_WORKER/health"
# 模拟入库
curl -sS -X POST "https://YOUR_WORKER/ingest?key=YOUR_KEY" \
-H 'content-type: application/json' \
-d '{"to":"test@your-domain.com","code":"ABC-DEF","subject":"ABC-DEF xAI confirmation code"}'
# 取码(consume=1 用后即删)
curl -sS "https://YOUR_WORKER/code?to=test@your-domain.com&key=YOUR_KEY"
```
真实链路:给 `random@your-domain.com` 发一封带 `ABC-DEF xAI confirmation code` 主题的信,几秒内应能 GET 到。
## 7. 安全
- `CODE_API_KEY` 用足够长的随机串
- 不要把 key 提交进 git(写 config.json / .env,二者已在 .gitignore)
- KV 中验证码默认约 10 分钟过期,且 `/code` 默认 consume-once