76 lines
3.1 KiB
Markdown
76 lines
3.1 KiB
Markdown
# @cio/tenant-router
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Cloudflare Worker that fronts every browser-facing ClassroomIO host:
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- `*.classroomio.school/*` — free-tier tenant sites
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- `classroomio.school/*` — apex (301 → `classroomio.com`)
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- `app.classroomio.com/*` — admin dashboard
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- BYOD customer domains via Cloudflare for SaaS
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The Worker forwards each request to one of two Render services based on path:
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| Path | Upstream |
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|---|---|
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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.classroomio.school`, 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 `classroomio.school` apex to (default `https://classroomio.com`) |
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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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`classroomio.school` zone (new):
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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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- `cname` CNAME → any valid target, **Proxied** — this is the value BYOD customers point their CNAME at
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`classroomio.com` zone:
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- `app` CNAME → **Proxied** so the route binds
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- `api` CNAME → **DNS only** (server-to-server callers and webhooks bypass the Worker)
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- The old wildcard `*` CNAME on `classroomio.com` should be deleted — tenant traffic now belongs on `classroomio.school`.
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## Cloudflare for SaaS (BYOD)
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On the `classroomio.school` zone:
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- **SSL/TLS → Custom Hostnames**: enabled
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- **Fallback Origin**: `cname.classroomio.school` — BYOD traffic lands on the Worker route and is forwarded through the same code path as `*.classroomio.school`.
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The API uses these env vars (`apps/api/src/services/org/domain.ts`):
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- `CLOUDFLARE_CUSTOM_HOSTNAMES_API_TOKEN` — Cloudflare API token scoped to the `classroomio.school` zone with `Zone → SSL and Certificates → Edit` + `Zone → Zone → Read`.
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- `CLOUDFLARE_CUSTOM_HOSTNAMES_ZONE_ID` — Zone ID for `classroomio.school`.
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- `CLOUDFLARE_CUSTOM_HOSTNAME_CNAME_TARGET=cname.classroomio.school`.
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