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394d1c811d #192: deploy-level backup target allowlist
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BACKUP_ALLOWED_TARGETS (comma-separated destination hosts) constrains
where backups may go, enforced twice: the api rejects settings writes
and connection tests towards non-allowlisted hosts with admin-visible
error codes and resolves a non-allowlisted configured target to null,
and the sidecar enforces the same policy at the point of egress for the
WebDAV upload and the rsync mirror alike (shared policy helpers in
packages/shared/src/backup-target-policy.ts).

BREAKING: the empty default disables every remote target - backups stay
local only, the VS-NfD reference configuration (ADR 0026). Existing
deployments with a remote target must list its host or uploads and
mirror stop. The admin UI distinguishes unavailable-by-policy from
unconfigured (i18n de+en) and shows the permitted hosts.

Refs #192 (ADR 0026)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0168Ph5uBmHm8X28CSVpbpnJ
2026-07-30 12:17:14 +02:00
5cef359b8f Nextcloud backup target: admin-configured, manual + scheduled uploads, in-app restore (#103)
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Off-host backups for every self-hoster, configured entirely in the admin
UI — supersedes the host-specific mirror plan behind #84.

shared:
- webdav.ts (new package entry like token-crypto): minimal WebDAV client
  with basic auth — PROPFIND (tolerant multistatus parser), MKCOL, PUT
  (streamed), GET, DELETE; Nextcloud DAV path derived from the plain
  server URL, explicit DAV bases pass through
- backup-status.ts: additive remote-upload status in status.json, the
  restore-status.json contract (running/succeeded/failed + staleness
  bound), the backup_command/backup_maintenance NOTIFY channels, and the
  one-bundle-per-set naming (dorfteich-backup-<id>.tar.gz)
- backup-set.ts moved here from apps/backup (api lists local sets)

backup sidecar:
- reads the backup.* instance settings directly from the database (admin
  changes apply next run; local retention row overrides the env) and the
  app password from the secret store
- after each successful set: bundle dump + files archive + manifest into
  ONE self-contained tar.gz, upload via WebDAV per schedule
  (off/daily/weekly; manual runs always upload), prune remote bundles —
  never the newest — and record the outcome in status.json; upload
  failures alert via a new backupUploadFailed mail (de+en)
- command listener on backup_command (run / restore) with a serial queue
  against the nightly timer
- restore orchestrator: restore-status.json → maintenance NOTIFY →
  grace → (remote: download + manifest-verify bundle) → terminate other
  DB connections → shared perform-restore path (same code as restore.sh)
  → final status + maintenance exit

api:
- MaintenanceGuard (global, registered before the setup gate): 503
  maintenance_mode while restore-status says running; health endpoints
  and the new public GET /backup/restore-status stay exempt; a stale
  running state (crashed sidecar) unblocks after 30 min
- MaintenanceStateService watches the file and restarts the api after a
  successful restore (fresh caches, migrate-on-start for older dumps);
  main.ts refuses to touch the database while a restore runs — a
  container restarting mid-restore must not race pg_restore with
  migrate deploy
- worker sweeps (conversion, mail outbox, scheduler) catch transient
  database failures instead of dying on an unhandled rejection — the
  restore's connection termination crashed the api in verification
- backup admin endpoints under /admin/system/backup: settings (live
  connection test before save, password write-only into the secret
  store), nextcloud/test, sets (local via the ro backups mount + remote
  via WebDAV), run + restore (type-to-confirm backstop, source
  validation) — commands travel as NOTIFY payloads; audit actions
  backup.settings_changed/run_triggered/restore_requested
- readyz: new warning-level backup_remote check while a target is
  configured (26 h daily / 170 h weekly bound)

collab:
- maintenance listener: on enter, persist + close every live session and
  refuse new connections until exit (failsafe timeout 30 min) — no
  in-memory document may write pre-restore content back afterwards

web:
- Admin → System backup section: status card with remote facts and a
  "Back up now" button, the Nextcloud settings form with test button,
  and the restore picker (local + remote sets, type-to-confirm)
- global maintenance screen: any 503 maintenance_mode flips the SPA to a
  status page polling the exempt endpoint, reloading when the instance
  returns

Verified end-to-end against a live stack (fresh DB, native api + sidecar,
fake WebDAV server): configure → test → manual backup → bundle upload →
readyz/sets/status surfaces → remote restore with maintenance gate,
marker rollback and api restart; suites: shared 21, backup 9, collab 11,
api 58 files green, lint + i18n:check + typecheck clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EwZ4jR4KFAPvpjWevfUGX1
2026-07-12 10:39:18 +02:00