Companion to DC-042 (tailscale-manager). Adds the write-side of Tailscale
integration — REST client for api.tailscale.com that lets DashCaddy
manage its own tailnet (devices, pre-auth keys, users, ACL).
src/managers/tailscale-coord.js — new module:
* Ping, list/get/delete devices, create/list/delete pre-auth keys,
list users, get/update ACL
* 5min read cache, 60s device-list cache, 1hr ping cache
* Cache invalidation on writes
* Graceful {configured:false} when no token
* TailscaleCoordError class with code mapping (unauthorized, not_found,
rate_limited, server_error)
* fetchImpl injection point for tests; native https in production
* 45 unit tests covering all paths
src/context/index.js — new tailscaleCoord namespace:
* getClient() lazy-builds a fresh client each call (token re-read from
credentialManager so settings changes take effect without restart)
* loadMetadata/saveMetadata for tailscale-config.json
* setApiToken/hasApiToken wrappers around credentialManager
routes/tailscale-admin.js — new routes:
* GET /api/v1/tailscale/settings — config status, never the token
* PUT /api/v1/tailscale/settings — validate + store encrypted
* DELETE /api/v1/tailscale/settings — wipe token + metadata
* POST /api/v1/tailscale/settings/test — ping without saving
* GET /api/v1/tailscale/admin/devices — full device list
* DELETE /api/v1/tailscale/admin/devices/:id — revoke device
* GET /api/v1/tailscale/admin/users — tailnet users
* GET /api/v1/tailscale/admin/keys — pre-auth key metadata
* POST /api/v1/tailscale/admin/keys — create pre-auth key (returns secret ONCE)
* DELETE /api/v1/tailscale/admin/keys/:id — revoke pre-auth key
* 29 route integration tests with supertest
src/app.js — wired the new router into the /api/v1/tailscale mount.
BACKLOG.md — DC-042 marked done, DC-043 added with full design notes.
Note: deliberately no token auto-rotation — Tailscale API keys
don't auto-renew, and silently re-issuing admin credentials
would erode the audit-trail checkpoint that token expiry
provides.
Tests: 1167 -> 1212 (+45), all green. Lint clean.
