kill-the-news/README.md

# kill-the-news

Convert email newsletters into private RSS feeds using Cloudflare Workers.

Self-hosted, uses your own domain, and keeps your data in your own Cloudflare account. Live at [kill-the.news](https://kill-the.news).

## Why this exists

Many newsletters only support email delivery. RSS readers offer a better reading experience, but getting email-only newsletters into RSS usually means relying on shared third-party infrastructure.

kill-the-news keeps the same workflow while avoiding shared domains and shared data stores.

## Features

- One-click feed creation from an admin dashboard
- Bulk feed/email deletion from the admin dashboard (safe checkbox-based flow)
- Inline double-confirm delete interactions with toast feedback in the admin dashboard
- Resizable + sortable table columns in the admin dashboard (Table view)
- Unique newsletter addresses per feed (for example `apple.mountain.42@yourdomain.com`)
- Cloudflare Email Workers ingestion (no third-party service)
- ForwardEmail webhook ingestion with source-IP verification (optional alternative)
- Optional per-feed sender allowlist (`email@domain.com` or `domain.com`)
- RSS generation on demand (`/rss/:feedId`)
- Atom feed at `/atom/:feedId`
- Per-feed favicon derived from the last sender's domain (`/favicon/:feedId`), cached and shown in feeds + admin
- Automatic RFC 8058 one-click unsubscribe when a feed is deleted — stops newsletters from mailing the now-dead address
- Email attachments stored in Cloudflare R2 and exposed as RSS enclosures (optional)
- Cloudflare KV storage for feed config + email metadata/content
- Password-protected admin UI

## Architecture

Two ingestion methods are supported — pick one or use both:

| Method                       | How it works                                                                                                                         |
| ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
| **Cloudflare Email Workers** | Cloudflare Email Routing delivers the raw message directly to the Worker via the `email()` handler — no outbound webhook needed      |
| **ForwardEmail webhook**     | ForwardEmail parses the message and POSTs a JSON payload to `POST /api/inbound`; the Worker verifies the source IP before processing |

Common path:

1. Incoming email arrives at `user@yourdomain.com`.
2. The Worker resolves the feed from the recipient address and stores the email in KV.
3. `https://yourdomain.com/rss/:feedId` renders RSS from stored items.
4. `/admin` provides feed management and email deletion.
5. `https://yourdomain.com/` shows a public status page with monitoring counters and a link to the admin.

Main routes:

- `src/lib/cloudflare-email.ts`: Cloudflare Email Workers ingestion
- `src/routes/inbound.ts`: ForwardEmail webhook ingestion
- `src/routes/rss.ts`: RSS rendering
- `src/routes/atom.ts`: Atom feed rendering
- `src/routes/files.ts`: attachment file serving from R2
- `src/routes/admin.ts`: admin UI + feed CRUD
- `src/routes/home.tsx`: public status page (`GET /`)
- `src/routes/stats.ts`: monitoring counters API (`GET /api/stats`)

### Monitoring

`GET /api/stats` returns JSON counters (public, no auth) for uptime/monitoring tools:

| Field                         | Meaning                                                  |
| ----------------------------- | -------------------------------------------------------- |
| `active_feeds`                | Feeds currently configured (live)                        |
| `feeds_created`               | Total feeds ever created (cumulative)                    |
| `feeds_deleted`               | Total feeds ever deleted (cumulative)                    |
| `emails_received`             | Total emails ingested successfully (cumulative)          |
| `emails_rejected`             | Total emails rejected during validation (cumulative)     |
| `websub_subscriptions_active` | Active WebSub subscriptions (live)                       |
| `last_email_at`               | ISO 8601 date-time of the last ingested email            |
| `last_feed_created_at`        | ISO 8601 date-time of the last feed creation             |
| `first_seen`                  | ISO 8601 date-time the instance first recorded a counter |

The same figures are rendered on the public status page at `GET /`. Cumulative counters
are persisted in the `EMAIL_STORAGE` KV under the `stats:counters` key.

## Requirements

- Node.js 20+
- A Cloudflare account (free plan works — Workers, KV, and Email Routing are all included)
- A domain added to Cloudflare as a zone (DNS managed by Cloudflare)
- A ForwardEmail account _(Option B only)_

## Cloudflare setup

If your domain is not yet on Cloudflare: in the [Cloudflare dashboard](https://dash.cloudflare.com/), go to _Add a site_, enter your domain, choose the Free plan, and follow the instructions to update your nameservers at your registrar. Wait for the zone to become active (usually a few minutes).

## Setup

1. Clone this repository.
2. Authenticate Wrangler:
   ```bash
   npx wrangler login
   ```
3. Run setup:

   ```bash
   bash setup.sh
   ```

   The script will prompt for an admin password and your domain, then:
   - install npm dependencies
   - verify Cloudflare auth (`wrangler whoami`)
   - create KV namespaces (`EMAIL_STORAGE` + preview) in your account
   - set the `ADMIN_PASSWORD` secret in the `production` environment
   - generate `wrangler.toml` from `wrangler-example.toml` with your KV IDs, domain, and today's compatibility date

4. Configure email ingestion — choose **one** of the two options below.

### Option A — Cloudflare Email Workers (recommended)

No third-party service required. Cloudflare receives the email and hands it directly to the Worker.

1. In the Cloudflare dashboard, go to _Email → Email Routing_ for your zone and click **Enable Email Routing**. Cloudflare will prompt you to add MX and SPF records — accept and it adds them automatically.
2. Under _Email Routing → Routing Rules_, add a **Catch-all** rule:
   - Action: **Send to Worker**
   - Worker: `kill-the-news` (the name from `wrangler.toml`)

That's it. No webhook configuration is needed.

### Option B — ForwardEmail (alternative)

Use this if you prefer ForwardEmail's additional features (sender filtering, open-tracking, etc.).

Add these DNS records in Cloudflare (_DNS → Records_):

| Type | Name | Content                                              | Notes                   |
| ---- | ---- | ---------------------------------------------------- | ----------------------- |
| MX   | @    | `mx1.forwardemail.net`                               | Priority `10`, DNS only |
| MX   | @    | `mx2.forwardemail.net`                               | Priority `10`, DNS only |
| TXT  | @    | `"forward-email=https://yourdomain.com/api/inbound"` | webhook target          |
| TXT  | @    | `"v=spf1 include:spf.forwardemail.net -all"`         | SPF                     |

Replace `yourdomain.com` with your actual domain.

The Worker verifies each webhook request against ForwardEmail's published MX IP list before processing it.

5. Deploy:

   ```bash
   npm run deploy
   ```

   Wrangler will create the Worker and register `yourdomain.com` (and `www.yourdomain.com`) as custom domains pointing to it. Cloudflare handles TLS automatically.

6. Open `https://yourdomain.com/admin` and sign in.

> **Tip:** To verify the Worker is running, check _Workers & Pages → kill-the-news_ in the Cloudflare dashboard. The _Custom Domains_ tab should list your domain once the deploy succeeds.

## Development

```bash
npm install
npm run dev
npm test
npm run build
```

## Configuration notes

- `wrangler-example.toml` is the template; `wrangler.toml` is generated locally.
- Keep `compatibility_date` fresh when doing runtime upgrades.
- `ADMIN_PASSWORD` is a Cloudflare Worker secret, not a plain env var in config.

### Feed size limit

By default the worker keeps emails until the feed's stored data exceeds **512 KB**, then drops the oldest entries (and their KV records) to stay under the limit. This is more robust than a fixed entry count for HTML-heavy newsletters.

To override the threshold, add to `wrangler.toml` under `[vars]`:

```toml
FEED_MAX_SIZE_BYTES = "524288"   # 512 KB — adjust as needed
```

### Email attachments (R2)

When an incoming email contains attachments, the Worker can store them in a Cloudflare R2 bucket and expose them as `<enclosure>` elements in the RSS feed (and `<link rel="enclosure">` in Atom). Each attachment is served at `/files/{id}/{filename}` with an immutable cache header.

This feature is **optional**. If no R2 bucket is bound, attachments are silently ignored and nothing else changes.

**Setup (automated):** `setup.sh` now asks _"Enable email attachments stored in R2?"_. Answer yes and it creates the buckets (`<worker>-attachments` and `<worker>-attachments-preview`) and wires the binding into the generated `wrangler.toml` for you.

**Setup (manual):**

1. Create an R2 bucket in the Cloudflare dashboard (_R2 Object Storage → Create bucket_), or with Wrangler:
   ```bash
   npx wrangler r2 bucket create your-bucket-name
   ```
2. In `wrangler.toml`, uncomment and fill in the R2 binding (the commented block from `wrangler-example.toml`):
   ```toml
   r2_buckets = [
     { binding = "ATTACHMENT_BUCKET", bucket_name = "your-bucket-name", preview_bucket_name = "your-bucket-name-preview" }
   ]
   ```
   The binding is **per environment**: add it under every env you deploy (`[env.production]`, `[env.demo]`, …), each pointing at its own bucket.
3. Redeploy:
   ```bash
   npm run deploy
   ```

**Turning it off:** set `ATTACHMENTS_ENABLED = "false"` in `[vars]` to disable attachments even while the R2 bucket stays bound (useful to cap usage on a demo). Any other value (or leaving it unset) keeps the feature on whenever R2 is configured.

Attachments are deleted from R2 automatically when the corresponding email is deleted from the admin UI, or when an email is dropped during feed size trimming.

**Monitoring storage / free tier:** the status page (`/`) and `/api/stats` report R2 space used (against the **10 GB** R2 free tier) and an estimate of KV space used (against the **1 GB** KV free tier). The figures are refreshed hourly by the cron trigger. KV usage is an estimate based on stored email sizes, so treat it as a lower bound.

### External auth provider (Authelia / Authentik / reverse proxy)

Instead of the built-in password login you can delegate admin authentication to a reverse proxy that sets a trusted user header (`Remote-User` or `X-Forwarded-User`).

**Required Worker secrets** (set with `wrangler secret put`, never in `[vars]`):

| Secret              | Description                                    |
| ------------------- | ---------------------------------------------- |
| `PROXY_AUTH_SECRET` | Shared secret between the proxy and the Worker |

**Required `[vars]`** in `wrangler.toml`:

```toml
PROXY_TRUSTED_IPS = "10.0.0.1"   # comma-separated IPs of your reverse proxy
```

When both are configured, the Worker authenticates a request if:

1. `CF-Connecting-IP` is in `PROXY_TRUSTED_IPS`
2. The `X-Auth-Proxy-Secret` header matches `PROXY_AUTH_SECRET`
3. `Remote-User` or `X-Forwarded-User` is non-empty

Password login remains available as a fallback when the proxy check fails.

> **Security note:** `CF-Connecting-IP` can be spoofed on direct `workers.dev` requests. Disable the `workers.dev` subdomain in production (`workers_dev = false` in `[env.production]`).

## Security notes

- When using Option B (ForwardEmail), inbound webhook access is IP-restricted to ForwardEmail MX sources.
- Admin auth uses a signed, `HttpOnly`, `Secure`, `SameSite=Strict` cookie.
- Admin responses are `no-store` to avoid cache leakage.
- For high-value feeds, set `Allowed senders` so only known sender addresses/domains are accepted.
- You should use a strong admin password and rotate periodically.
- All secret comparisons (admin password, proxy secret) use constant-time comparison to prevent timing attacks.

## Upgrading dependencies

To refresh dependencies to latest:

```bash
npm outdated
npm install
npm test
npm run build
```

Then update `compatibility_date` and redeploy.

## Acknowledgements

- [kill-the-newsletter](https://github.com/leafac/kill-the-newsletter) by Leandro Facchinetti — the inspiration for this project and the reference implementation for feature ideas (Atom feeds, attachment enclosures, entry HTML views, and more).
- [Email-to-RSS](https://github.com/yl8976/Email-to-RSS) by yl8976 — the initial codebase this project is based on.

## License

MIT