70 lines
3.7 KiB
Markdown
70 lines
3.7 KiB
Markdown
# @cio/tenant-router
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Cloudflare Worker that fronts every browser-facing ClassroomIO host:
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- `*.myclassroomio.com/*` — free-tier tenant sites
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- `myclassroomio.com/*` — apex (301 → `classroomio.com`)
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- `app.classroomio.com/*` — admin dashboard
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- `embed.classroomio.com/*` — public embed widget scripts (R2 `assets` bucket, path-for-path)
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- BYOD customer domains via Approximated (their proxy forwards to `cio-api.onrender.com` directly, not through this Worker)
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The Worker forwards each request to one of two Render services based on path:
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| Host / path | Upstream |
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| ------------- | ------------------------------------------------------------------------------ |
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| `embed.*` | R2 `assets` bucket — `/{widget}` maps to internal keys (`src/embed-assets.ts`) |
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| `/proxy/*` | API service (`/proxy` prefix stripped, rest forwarded as-is) |
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| anything else | Dashboard service |
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The `/proxy` prefix is the same-origin escape hatch the dashboard's
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browser code uses so its auth cookies stay host-only while still reaching
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the API. Example: a browser request to
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`https://app.classroomio.com/proxy/api/auth/sign-in/email` becomes
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`/api/auth/sign-in/email` on the API service (where Better Auth lives).
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It preserves the original host as `X-Forwarded-Host` so:
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- The dashboard's SvelteKit adapter-node reads it via `HOST_HEADER=x-forwarded-host` and `event.url.host` becomes the tenant/admin/BYOD host.
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- Better Auth on the API emits session cookies without a `Domain` attribute (see `packages/db/src/auth.ts` — `crossSubDomainCookies: { enabled: false }`), so the browser scopes each session to the exact host it called. Tenants on `acme.myclassroomio.com`, the admin app on `app.classroomio.com`, and BYOD `learn.acme.com` each get host-only sessions.
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## Deploy
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```bash
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pnpm --filter @cio/tenant-router deploy
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```
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Live tail:
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```bash
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pnpm --filter @cio/tenant-router tail
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```
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## Env vars (wrangler.toml `[vars]`)
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| Var | Value |
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| ------------------------- | ------------------------------------------------------------------------------- |
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| `DASHBOARD_UPSTREAM_HOST` | `.onrender.com` host of the dashboard service (no scheme) |
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| `API_UPSTREAM_HOST` | `.onrender.com` host of the API service |
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| `APEX_REDIRECT_TARGET` | URL to redirect `myclassroomio.com` apex to (default `https://classroomio.com`) |
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| `EMBED_HOST` | Hostname for public embed widgets (default `embed.classroomio.com`) |
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| `API_URL` | API origin injected into embed scripts as `window.CIO.apiBaseUrl` |
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Update the values in `wrangler.toml` after looking them up in the Render dashboard.
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## Cloudflare DNS expected setup
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`myclassroomio.com` zone:
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- `*` CNAME → any valid target, **Proxied**
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- `@` CNAME → any valid target, **Proxied** (Worker serves the 301)
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`classroomio.com` zone:
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- `app` CNAME → **Proxied** so the route binds
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- `embed` CNAME → **Proxied** (serves `embeds/*` from R2 via Worker)
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- `api` CNAME → **DNS only** (server-to-server callers and webhooks bypass the Worker)
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## BYOD custom domains
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Handled by [Approximated](https://approximated.app/), not this Worker. Cloudflare for SaaS can't front a Render origin (Render itself runs on Cloudflare), so we use Approximated's dedicated edge cluster instead. See `apps/api/src/services/org/domain.ts` for the integration. Customers point an A record at the IP Approximated returns; the proxy forwards directly to `cio-api.onrender.com`.
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