fix: publish alpha server releases as prereleases

.gitignore

@@ -13,3 +13,4 @@ server-data/
 # OS
 .DS_Store
 Thumbs.db
+release/

LICENSE

@@ -0,0 +1,17 @@
+Verstak Sync Server
+Copyright (C) 2026 Verstak contributors
+
+This program is free software: you can redistribute it and/or modify it under
+the terms of the GNU Affero General Public License as published by the Free
+Software Foundation, either version 3 of the License, or (at your option) any
+later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+details.
+
+The complete license text is available at:
+https://www.gnu.org/licenses/agpl-3.0.html
+
+SPDX-License-Identifier: AGPL-3.0-or-later

README.md

@@ -7,7 +7,7 @@ Standalone sync server for Verstak2 platform.
 This server provides synchronization between devices running Verstak2. It handles:
 
 - Device registration and authentication
-- Operational transform-based sync
+- Vault-scoped operation log sync with server sequence numbers and conflict detection
 - Blob storage for attachments
 - User management with email confirmation
 
@@ -24,6 +24,29 @@ This server provides synchronization between devices running Verstak2. It handle
 ./build/bin/verstak-sync-server --admin-user admin --admin-pass secret
 ```
 
+## Release packages
+
+Build a Linux amd64 archive locally:
+
+```bash
+./scripts/release.sh v0.1.0-alpha.1
+```
+
+It runs the server build and tests, then writes
+`release/verstak-sync-server-linux-amd64-<version>.tar.gz` and `SHA256SUMS`.
+The archive contains the server binary, systemd service file and install
+script.
+
+Publish those same assets to GitHub Releases:
+
+```bash
+./scripts/publish-github-release.sh v0.1.0-alpha.1
+```
+
+The publisher requires an authenticated [`gh`](https://cli.github.com/) CLI
+and a clean local `main` equal to `origin/main`. It creates and pushes an
+annotated tag when necessary, then creates or updates the GitHub Release.
+
 ## Configuration
 
 | Flag | Default | Description |
@@ -33,23 +56,147 @@ This server provides synchronization between devices running Verstak2. It handle
 | `--admin-user` | | Create admin user (first run) |
 | `--admin-pass` | | Admin password (first run) |
 
+Production installs use:
+
+- binary: `/opt/verstak-sync-server/verstak-sync-server`;
+- data directory: `/var/lib/verstak-sync-server`;
+- port environment file: `/etc/verstak-server/env`;
+- service: `verstak-server`.
+
+Install from a built binary:
+
+```bash
+./scripts/build.sh
+sudo ./scripts/install.sh \
+  --bin ./build/bin/verstak-sync-server \
+  --port 47732 \
+  --admin-user admin \
+  --admin-pass 'change-this-password'
+```
+
+The install script creates a locked-down system user, initializes the data
+directory, writes `/etc/verstak-server/env`, installs the systemd unit, and
+starts the service.
+
+## Deployment
+
+Run the service behind HTTPS in production. The sync server itself listens on
+plain HTTP; terminate TLS in a reverse proxy such as nginx, Caddy, or a platform
+load balancer, then forward to `127.0.0.1:47732`.
+
+Basic service operations:
+
+```bash
+sudo systemctl status verstak-server
+sudo journalctl -u verstak-server -f
+curl http://127.0.0.1:47732/api/v1/health
+```
+
+Change the listen port:
+
+```bash
+echo 'VERSTAK_PORT=47733' | sudo tee /etc/verstak-server/env
+sudo systemctl restart verstak-server
+```
+
+Upgrade the binary:
+
+```bash
+./scripts/build.sh
+sudo systemctl stop verstak-server
+sudo install -m 755 ./build/bin/verstak-sync-server /opt/verstak-sync-server/verstak-sync-server
+sudo systemctl start verstak-server
+```
+
+Keep `--data` stable across upgrades. The data directory is the server's source
+of truth.
+
+## Backup And Restore
+
+Back up the full data directory while the service is stopped. It contains:
+
+- `server.db` - SQLite database with users, devices, operations, SMTP settings,
+  and blob metadata;
+- `config.yml` - admin user configuration;
+- `blobs/` - content-addressed blob files.
+
+Create a backup:
+
+```bash
+sudo systemctl stop verstak-server
+sudo tar --xattrs --acls -czf verstak-sync-backup-$(date +%Y%m%d-%H%M%S).tar.gz \
+  -C /var/lib verstak-sync-server
+sudo systemctl start verstak-server
+```
+
+Restore onto a fresh host or after data loss:
+
+```bash
+sudo systemctl stop verstak-server
+sudo mv /var/lib/verstak-sync-server /var/lib/verstak-sync-server.broken.$(date +%Y%m%d-%H%M%S) 2>/dev/null || true
+sudo tar --xattrs --acls -xzf verstak-sync-backup-YYYYMMDD-HHMMSS.tar.gz -C /var/lib
+sudo chown -R verstak:verstak /var/lib/verstak-sync-server
+sudo chmod 750 /var/lib/verstak-sync-server
+sudo systemctl start verstak-server
+curl http://127.0.0.1:${VERSTAK_PORT:-47732}/api/v1/health
+```
+
+After restore, connected desktop clients keep their existing device tokens.
+If a backup is older than some client changes, those clients may need to run
+sync again so unpushed local operations are re-sent.
+
 ## Architecture
 
 ```
 cmd/server/          - Entry point
 internal/server/     - Server implementation
   - server.go        - Core server logic
-  - handlers.go      - HTTP handlers
+  - routes.go        - HTTP routing
+  - handlers_api.go  - Sync, client, health, and blob handlers
+  - handlers_auth.go - User auth API handlers
+  - handlers_admin.go - Admin web/API handlers
   - schema.go        - Database schema
 ```
 
 ## API Endpoints
 
-- `POST /api/push` - Push operations to server
+Desktop sync client:
-- `GET /api/pull` - Pull operations from server
+
-- `POST /api/device/pair` - Pair device with token
+- `POST /api/client/pair` - Pair a desktop client with username/password and its persistent `vault_id`, then return a device token
-- `POST /api/user/register` - Register new user
+- `POST /api/auth/test` - Validate username/password from the desktop client
-- `POST /api/user/login` - User login
+- `GET /api/client/me` - Return current authenticated client/device details
+- `POST /api/client/revoke-current` - Revoke the current desktop device token
+- `POST /api/client/revoke-device` - Revoke another device owned by the same user
+- `POST /api/v1/sync/push` - Push local operations to the server operation log
+- `POST /api/v1/sync/pull` - Pull operations since a server sequence number
+- `POST /api/v1/blobs/` - Store a multipart `file` blob and return its SHA-256 hash
+- `GET /api/v1/blobs/{sha256}` - Download a stored blob by SHA-256 hash
+
+User API:
+
+- `POST /api/v1/auth/register` - Register a user
+- `GET /api/v1/auth/confirm?token=...` - Confirm email
+- `POST /api/v1/auth/login` - User login
+- `POST /api/v1/auth/forgot` - Request password reset
+- `POST /api/v1/auth/reset` - Reset password
+- `GET /api/v1/user/devices` - List devices for the current user session
+
+Operational endpoints:
+
+- `GET /api/v1/health` - Server health and basic storage status
+- `/admin/...` - Admin web UI and admin JSON endpoints
+- `/register`, `/login`, `/dashboard`, `/forgot`, `/reset`, `/logout` - User web UI
+
+Sync operations are generic records with `entity_type`, `entity_id`, `op_type`,
+`payload_json`, `device_id`, and sequencing metadata. A pairing token is bound
+to one user and vault. The server derives the stored device ID and operation
+scope from that token, ignores a caller-supplied `device_id` for authorization,
+and returns only operations and cursors from the authenticated user/vault.
+Verstak desktop owns the v2 payload semantics.
+
+New device enrollment requires a non-empty `vault_id`. The `legacy:` prefix is
+reserved for server-side migration of older records and cannot be selected by
+new clients.
 
 ## Development
 
@@ -63,4 +210,5 @@ CGO_ENABLED=1 go build -o verstak-sync-server ./cmd/server
 
 ## License
 
-MIT
+Copyright © 2026 Verstak contributors. Licensed under
+[GNU AGPLv3 or later](LICENSE).

docs/superpowers/plans/2026-07-10-sync-tenant-isolation.md

@@ -0,0 +1,99 @@
+# Sync Tenant Isolation Implementation Plan
+
+> **For agentic workers:** execute this plan task by task with focused tests
+> before each implementation change.
+
+**Goal:** prevent cross-user and cross-vault operation visibility while binding
+the persisted source device to the authenticated token.
+
+**Architecture:** the server derives user, device, and vault scope from the
+bearer token. SQLite rows carry that scope; desktop sends the immutable vault
+ID only while creating a pairing. Existing unscoped devices and operations are
+migrated into a deterministic legacy scope.
+
+**Tech stack:** Go, `database/sql`, SQLite, `net/http`, desktop Go sync client.
+
+## Task 1: Establish server behaviour tests
+
+**Files:**
+- Modify: `internal/server/server_test.go`
+
+- [x] Add helpers that create confirmed users and token-authenticated devices
+  with a specified vault ID.
+- [x] Add a failing test where separate users push and pull from the same
+  vault ID; each pull must contain only its own operation and cursor.
+- [x] Add a failing test where one user owns devices in two vaults; pulls must
+  remain vault-local.
+- [x] Add a failing test that sends another device's ID in `push`; assert the
+  stored and returned operation uses the authenticated device ID.
+- [x] Add a failing test for identical idempotency keys in different scopes.
+- [x] Run: `go test ./internal/server -run 'TestSync.*Isolation|TestSyncPush'`
+  and confirm the new assertions fail for the intended missing behaviour.
+
+## Task 2: Add idempotent SQLite scope migration
+
+**Files:**
+- Modify: `internal/server/schema.go`
+- Modify: `internal/server/server.go`
+- Test: `internal/server/server_test.go`
+
+- [x] Define `vault_id` on new devices and `user_id`/`vault_id` on new
+  operations; define scoped tombstone and idempotency primary keys.
+- [x] Add startup migration helpers that inspect columns, add compatible
+  columns, backfill owner IDs, assign `legacy:<user_id>` to old scopes, and
+  rebuild the two tables whose primary keys change.
+- [x] Add a failing legacy-schema fixture test, then make it pass by opening
+  the database through `NewServer` and asserting its operation has the
+  expected owner and legacy scope.
+- [x] Run: `go test ./internal/server -run 'Test.*Migration|TestSync.*'`.
+
+## Task 3: Apply authenticated scope to sync handlers
+
+**Files:**
+- Modify: `internal/server/middleware.go`
+- Modify: `internal/server/handlers_api.go`
+- Test: `internal/server/server_test.go`
+
+- [x] Extend authenticated device lookup to provide the effective vault scope;
+  missing user ownership must not authorize sync operations.
+- [x] Require `vault_id` when creating a new client pairing and store it with
+  the device.
+- [x] Make push use authenticated device/user/vault values for inserts,
+  conflicts, revisions, tombstones, and idempotency lookup/storage.
+- [x] Make pull filter operations and its reported cursor by authenticated
+  user/vault.
+- [x] Run the focused tests from Task 1 until green, then
+  `go test ./internal/server`.
+
+## Task 4: Send the current vault ID while pairing
+
+**Files:**
+- Modify: `../verstak-desktop/internal/core/sync/client.go`
+- Modify: `../verstak-desktop/internal/core/sync/client_test.go`
+- Modify: `../verstak-desktop/internal/api/app.go`
+- Modify: `../verstak-desktop/internal/api/app_test.go`
+
+- [x] Add `vault_id` to the pair request and expose it in the pairing client
+  method without changing push/pull wire compatibility.
+- [x] Read the open vault metadata in `syncConfigure`; reject configuration if
+  the vault ID is absent.
+- [x] Add a failing client/API test that captures the pair request and asserts
+  the persistent vault ID is sent.
+- [x] Rebind desktop sync state, cursor, and persisted device identity whenever
+  a vault is created, opened, or switched.
+- [x] Hydrate missing legacy vault device IDs from the authenticated sync
+  server before a token-based sync can use a global fallback.
+- [x] Run: `go test ./internal/core/sync ./internal/api`.
+
+## Task 5: Document, verify, and publish
+
+**Files:**
+- Modify: `README.md`
+- Modify: `docs/superpowers/specs/2026-07-10-sync-tenant-isolation-design.md`
+
+- [x] Document that pairing is vault-bound and that sync cursors are scoped.
+- [x] Run `gofmt` on all changed Go files.
+- [x] Run `go test ./...` in both `verstak-sync-server` and
+  `verstak-desktop`, then `git diff --check` in both repositories.
+- [x] Commit and push the sync-server and desktop changes as coordinated
+  security commits.

docs/superpowers/specs/2026-07-10-sync-tenant-isolation-design.md

@@ -0,0 +1,92 @@
+# Sync Tenant Isolation Design
+
+**Status:** approved for implementation by the project owner on 2026-07-10.
+
+## Goal
+
+Make sync operations private to the authenticated user and vault, and make the
+server, not the request body, the authority for the originating device.
+
+## Scope
+
+- Bind new desktop pairings to the current vault ID.
+- Persist `user_id` and `vault_id` with every sync operation.
+- Scope push conflict detection, pull cursors, tombstones, and idempotency
+  responses to that pair of identifiers.
+- Ignore the legacy `device_id` field in a push body for authorization and
+  storage; retain it in the wire format for backward-compatible decoding.
+- Upgrade existing SQLite databases without deleting data.
+
+Blob ownership, API-key retirement, reset-token handling, HTML escaping, and
+upload limits are separate security slices and are deliberately not included
+in this change.
+
+## Data model
+
+`server_devices` gains a nullable `vault_id`. A device created through either
+enrollment endpoint must have a non-empty vault ID that does not use the
+reserved `legacy:` prefix. The authenticated device therefore identifies one
+user and one vault.
+
+`server_ops` gains `user_id` and `vault_id`. New writes always set both from
+the authenticated device. Pull and conflict queries filter both fields.
+
+`server_tombstones` is rebuilt with a composite key of
+`(user_id, vault_id, entity_type, entity_id)`. `server_idempotency_keys` is
+rebuilt with a composite key of `(user_id, vault_id, idempotency_key)`.
+
+Existing devices without `vault_id` use the explicit effective scope
+`legacy:<user_id>`. Existing operations inherit their device owner and that
+legacy scope during startup migration. This preserves existing single-vault
+accounts while preventing data from crossing account boundaries. New pairings
+never use the legacy scope.
+
+Desktop sync state, operation queues, cursors, and persisted device IDs are
+vault-local. The desktop recreates its sync service whenever the active vault
+is created, opened, or switched. When it opens a legacy vault state without a
+stored device ID, it obtains the authenticated ID from `/api/client/me` before
+syncing and persists it locally.
+
+## API contract
+
+`POST /api/client/pair` accepts a required `vault_id`. The desktop gets it
+from `.verstak/vault.json` and sends it while pairing.
+
+`POST /api/v1/sync/push` keeps accepting `device_id` for old clients, but the
+server ignores it. The stored operation device ID is always the authenticated
+device. A request whose token is not associated with a user and effective
+vault returns a client error.
+
+`POST /api/v1/sync/pull` returns only operations from the authenticated
+user/vault scope. `server_sequence` is the highest sequence in that scope;
+global sequence gaps are not exposed as the caller's cursor.
+
+## Migration and failure handling
+
+Startup migration is idempotent. It checks SQLite table columns before adding
+new operation/device fields, backfills `user_id` from each operation's device,
+and assigns the explicit legacy scope when an old device has no vault ID.
+Tables whose primary key must change are rebuilt transactionally.
+
+The prior global idempotency cache is intentionally discarded during migration:
+it is only a replay cache and retaining it could replay one tenant's response
+for another tenant.
+
+If an operation cannot be associated with a user, it remains unscoped and is
+not readable through sync APIs. The server must not guess an owner from a
+request body.
+
+## Verification
+
+Focused server tests must prove:
+
+1. two users cannot pull each other's operations;
+2. two vaults of one user cannot pull each other's operations;
+3. a caller cannot forge another device through the push body;
+4. scoped idempotency does not replay another tenant's response;
+5. a legacy SQLite database is upgraded with its existing operation retained
+   in the matching legacy scope.
+6. switching the active desktop vault rebinds the sync queue, cursor, and
+   device identity to the new vault.
+
+Desktop tests must prove that pairing sends the opened vault's persistent ID.

internal/server/handlers_admin.go

@@ -5,6 +5,8 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"html"
+	"log"
 	"net/http"
 	"strings"
 	"time"
@@ -80,7 +82,8 @@ func (s *Server) handleAdminUsers(w http.ResponseWriter, r *http.Request) {
 	}
 	rows, err := s.db.Query("SELECT id, username, email, confirmed, blocked, created_at FROM server_users ORDER BY created_at DESC")
 	if err != nil {
-		http.Error(w, err.Error(), 500)
+		log.Printf("admin users: query failed: %v", err)
+		http.Error(w, t(s.locale(), "server.internalError"), http.StatusInternalServerError)
 		return
 	}
 	defer rows.Close()
@@ -113,8 +116,8 @@ td{padding:0.5rem;border-bottom:1px solid #0f3460}a{color:#4ecca3}</style></head
 		if u["blocked"].(int) != 0 {
 			blocked = "🚫"
 		}
-		w.Write([]byte(`<tr><td>` + u["username"].(string) + `</td><td>` + u["email"].(string) +
+		w.Write([]byte(`<tr><td>` + html.EscapeString(u["username"].(string)) + `</td><td>` + html.EscapeString(u["email"].(string)) +
-			`</td><td>` + confirmed + `</td><td>` + blocked + `</td><td>` + u["created_at"].(string) + `</td></tr>`))
+			`</td><td>` + confirmed + `</td><td>` + blocked + `</td><td>` + html.EscapeString(u["created_at"].(string)) + `</td></tr>`))
 	}
 	w.Write([]byte(`</table></body></html>`))
 }
@@ -126,7 +129,8 @@ func (s *Server) handleAdminDevices(w http.ResponseWriter, r *http.Request) {
 	rows, err := s.db.Query(`SELECT d.id, d.name, d.client_version, COALESCE(d.last_seen,''), COALESCE(d.revoked_at,''), d.created_at
 		FROM server_devices d ORDER BY d.created_at DESC`)
 	if err != nil {
-		http.Error(w, err.Error(), 500)
+		log.Printf("admin devices: query failed: %v", err)
+		http.Error(w, t(s.locale(), "server.internalError"), http.StatusInternalServerError)
 		return
 	}
 	defer rows.Close()
@@ -148,8 +152,8 @@ td{padding:0.5rem;border-bottom:1px solid #0f3460}a{color:#4ecca3}</style></head
 		if revokedAt == "" {
 			revokedAt = "-"
 		}
-		w.Write([]byte(`<tr><td>` + name + `</td><td style="font-family:monospace;font-size:0.8em">` + id +
+		w.Write([]byte(`<tr><td>` + html.EscapeString(name) + `</td><td style="font-family:monospace;font-size:0.8em">` + html.EscapeString(id) +
-			`</td><td>` + clientVer + `</td><td>` + lastSeen + `</td><td>` + revokedAt + `</td><td>` + createdAt + `</td></tr>`))
+			`</td><td>` + html.EscapeString(clientVer) + `</td><td>` + html.EscapeString(lastSeen) + `</td><td>` + html.EscapeString(revokedAt) + `</td><td>` + html.EscapeString(createdAt) + `</td></tr>`))
 	}
 	w.Write([]byte(`</table></body></html>`))
 }
@@ -213,11 +217,12 @@ func (s *Server) handleAdminSMTPTest(w http.ResponseWriter, r *http.Request) {
 		to = from
 	}
 	if host == "" || port == "" || from == "" {
-		jsonOK(w, map[string]interface{}{"ok": false, "error": "host, port and from required"})
+		jsonOK(w, map[string]interface{}{"ok": false, "error": t(s.locale(), "admin.smtpRequired")})
 		return
 	}
 	if err := s.smtpTest(host, port, user, pass, security, from, to); err != nil {
-		jsonOK(w, map[string]interface{}{"ok": false, "error": err.Error()})
+		log.Printf("admin SMTP test failed: %v", err)
+		jsonOK(w, map[string]interface{}{"ok": false, "error": t(s.locale(), "admin.smtpTestFailed")})
 		return
 	}
 	jsonOK(w, map[string]interface{}{"ok": true})
@@ -234,7 +239,7 @@ func (s *Server) handleAdminAPIDevices(w http.ResponseWriter, r *http.Request) {
 		LEFT JOIN server_users u ON u.id = d.user_id
 		ORDER BY d.created_at DESC`)
 	if err != nil {
-		jsonErr(w, 500, err.Error())
+		jsonInternalError(w, err)
 		return
 	}
 	defer rows.Close()
@@ -264,7 +269,7 @@ func (s *Server) handleAdminAPIKeys(w http.ResponseWriter, r *http.Request) {
 	case "GET":
 		rows, err := s.db.Query("SELECT id, name, api_key FROM server_devices ORDER BY created_at")
 		if err != nil {
-			jsonErr(w, 500, err.Error())
+			jsonInternalError(w, err)
 			return
 		}
 		defer rows.Close()
@@ -312,7 +317,7 @@ func (s *Server) handleAdminAPIKeysDelete(w http.ResponseWriter, r *http.Request
 	id := strings.TrimPrefix(r.URL.Path, "/admin/api/keys/")
 	_, err := s.db.Exec("DELETE FROM server_devices WHERE id=?", id)
 	if err != nil {
-		jsonErr(w, 500, err.Error())
+		jsonInternalError(w, err)
 		return
 	}
 	s.db.Exec("DELETE FROM server_user_devices WHERE device_id=?", id)
@@ -372,7 +377,7 @@ func (s *Server) handleAdminAPIUsers(w http.ResponseWriter, r *http.Request) {
 	args = append(args, perPage, offset)
 	rows, err := s.db.Query(sql, args...)
 	if err != nil {
-		jsonErr(w, 500, err.Error())
+		jsonInternalError(w, err)
 		return
 	}
 	defer rows.Close()
@@ -432,7 +437,7 @@ func (s *Server) handleAdminAPIUserActions(w http.ResponseWriter, r *http.Reques
 		hash, _ := bcrypt.GenerateFromPassword([]byte(newPass), bcrypt.DefaultCost)
 		_, err := s.db.Exec("UPDATE server_users SET password_hash=? WHERE id=?", string(hash), id)
 		if err != nil {
-			jsonErr(w, 500, err.Error())
+			jsonInternalError(w, err)
 			return
 		}
 		jsonOK(w, map[string]interface{}{"status": "ok", "new_password": newPass})
@@ -455,7 +460,7 @@ func (s *Server) handleAdminAPIUserActions(w http.ResponseWriter, r *http.Reques
 		}
 		_, err := s.db.Exec("UPDATE server_users SET username=?, email=? WHERE id=?", editReq.Username, strings.ToLower(editReq.Email), id)
 		if err != nil {
-			jsonErr(w, 500, err.Error())
+			jsonInternalError(w, err)
 			return
 		}
 		jsonOK(w, map[string]interface{}{"status": "ok"})
@@ -533,8 +538,9 @@ func (s *Server) handleAdminCreateUser(w http.ResponseWriter, r *http.Request) {
 				w.WriteHeader(409)
 				w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), "Username or email already taken", "/admin/create-user")))
 			} else {
+				log.Printf("admin create user: failed: %v", err)
 				w.WriteHeader(500)
-				w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), err.Error(), "/admin/create-user")))
+				w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), t(locale, "admin.createUserFailed"), "/admin/create-user")))
 			}
 			return
 		}
@@ -586,7 +592,7 @@ func (s *Server) handleAdminAPICreateUser(w http.ResponseWriter, r *http.Request
 		if strings.Contains(err.Error(), "UNIQUE") {
 			jsonErr(w, 409, "username or email already taken")
 		} else {
-			jsonErr(w, 500, err.Error())
+			jsonInternalError(w, err)
 		}
 		return
 	}

internal/server/handlers_api.go

@@ -50,6 +50,7 @@ func (s *Server) handleClientPair(w http.ResponseWriter, r *http.Request) {
 		Password      string `json:"password"`
 		DeviceName    string `json:"device_name"`
 		ClientVersion string `json:"client_version"`
+		VaultID       string `json:"vault_id"`
 	}
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
 		jsonErr(w, 400, "bad json")
@@ -59,6 +60,15 @@ func (s *Server) handleClientPair(w http.ResponseWriter, r *http.Request) {
 		jsonErr(w, 400, "login and password required")
 		return
 	}
+	req.VaultID = strings.TrimSpace(req.VaultID)
+	if req.VaultID == "" {
+		jsonErr(w, 400, "vault_id required")
+		return
+	}
+	if strings.HasPrefix(req.VaultID, "legacy:") {
+		jsonErr(w, 400, "vault_id uses reserved prefix")
+		return
+	}
 	if req.DeviceName == "" {
 		req.DeviceName = "unknown"
 	}
@@ -95,12 +105,12 @@ func (s *Server) handleClientPair(w http.ResponseWriter, r *http.Request) {
 	apiKey := make([]byte, 20)
 	rand.Read(apiKey)
 	_, err = s.db.Exec(`INSERT INTO server_devices
-		(id, name, api_key, token_hash, token_prefix, token_suffix, user_id, client_version, last_ip, last_seen, created_at)
+		(id, name, api_key, token_hash, token_prefix, token_suffix, user_id, vault_id, client_version, last_ip, last_seen, created_at)
-		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
 		deviceID, req.DeviceName, hex.EncodeToString(apiKey), tokenHash, prefix, suffix,
-		userID, req.ClientVersion, ip, now, now)
+		userID, req.VaultID, req.ClientVersion, ip, now, now)
 	if err != nil {
-		jsonErr(w, 500, err.Error())
+		jsonInternalError(w, err)
 		return
 	}
 	s.db.Exec("INSERT OR IGNORE INTO server_user_devices (user_id, device_id) VALUES (?, ?)", userID, deviceID)
@@ -272,6 +282,7 @@ func (s *Server) handleDeviceRegister(w http.ResponseWriter, r *http.Request) {
 		Name     string `json:"name"`
 		Username string `json:"username"`
 		Password string `json:"password"`
+		VaultID  string `json:"vault_id"`
 	}
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
 		jsonErr(w, 400, "invalid JSON")
@@ -285,6 +296,15 @@ func (s *Server) handleDeviceRegister(w http.ResponseWriter, r *http.Request) {
 		jsonErr(w, 401, "username and password required")
 		return
 	}
+	req.VaultID = strings.TrimSpace(req.VaultID)
+	if req.VaultID == "" {
+		jsonErr(w, 400, "vault_id required")
+		return
+	}
+	if strings.HasPrefix(req.VaultID, "legacy:") {
+		jsonErr(w, 400, "vault_id uses reserved prefix")
+		return
+	}
 	var userID, hash string
 	var confirmed, blocked int
 	err := s.db.QueryRow("SELECT id, password_hash, confirmed, blocked FROM server_users WHERE username=? OR email=?",
@@ -311,11 +331,11 @@ func (s *Server) handleDeviceRegister(w http.ResponseWriter, r *http.Request) {
 	deviceID := apiKey[:12]
 	now := time.Now().UTC().Format(time.RFC3339)
 	_, err = s.db.Exec(
-		"INSERT INTO server_devices (id, name, api_key, last_seen, created_at) VALUES (?, ?, ?, ?, ?)",
+		"INSERT INTO server_devices (id, name, api_key, user_id, vault_id, last_seen, created_at) VALUES (?, ?, ?, ?, ?, ?, ?)",
-		deviceID, req.Name, apiKey, now, now,
+		deviceID, req.Name, apiKey, userID, req.VaultID, now, now,
 	)
 	if err != nil {
-		jsonErr(w, 500, err.Error())
+		jsonInternalError(w, err)
 		return
 	}
 	s.db.Exec("INSERT OR IGNORE INTO server_user_devices (user_id, device_id) VALUES (?, ?)", userID, deviceID)
@@ -326,7 +346,7 @@ func (s *Server) handleDeviceRegister(w http.ResponseWriter, r *http.Request) {
 }
 
 func (s *Server) handleSyncPush(w http.ResponseWriter, r *http.Request) {
-	_, _, ok := s.requireAuth(w, r)
+	scope, ok := s.requireSyncScope(w, r)
 	if !ok {
 		return
 	}
@@ -349,12 +369,14 @@ func (s *Server) handleSyncPush(w http.ResponseWriter, r *http.Request) {
 		} `json:"ops"`
 	}
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
-		jsonErr(w, 400, "invalid JSON: "+err.Error())
+		jsonErr(w, 400, "invalid JSON")
 		return
 	}
 	if req.IdempotencyKey != "" {
 		var cachedJSON string
-		err := s.db.QueryRow("SELECT response_json FROM server_idempotency_keys WHERE idempotency_key=?", req.IdempotencyKey).Scan(&cachedJSON)
+		err := s.db.QueryRow(`SELECT response_json FROM server_idempotency_keys
+			WHERE user_id=? AND vault_id=? AND idempotency_key=?`,
+			scope.UserID, scope.VaultID, req.IdempotencyKey).Scan(&cachedJSON)
 		if err == nil {
 			w.Header().Set("Content-Type", "application/json")
 			w.Write([]byte(cachedJSON))
@@ -371,9 +393,9 @@ func (s *Server) handleSyncPush(w http.ResponseWriter, r *http.Request) {
 		if op.LastSeenServerSeq > 0 {
 			conflictRows, err := s.db.Query(`
 				SELECT op_id, device_id, op_type, server_sequence FROM server_ops
-				WHERE entity_type=? AND entity_id=? AND device_id!=?
+				WHERE user_id=? AND vault_id=? AND entity_type=? AND entity_id=? AND device_id!=?
 				  AND server_sequence > ? AND op_type != 'delete'
-				ORDER BY server_sequence`, op.EntityType, op.EntityID, req.DeviceID, op.LastSeenServerSeq)
+				ORDER BY server_sequence`, scope.UserID, scope.VaultID, op.EntityType, op.EntityID, scope.DeviceID, op.LastSeenServerSeq)
 			if err == nil {
 				for conflictRows.Next() {
 					var cOpID, cDevID, cOpType string
@@ -392,9 +414,9 @@ func (s *Server) handleSyncPush(w http.ResponseWriter, r *http.Request) {
 			}
 		}
 		res, err := s.db.Exec(
-			`INSERT OR IGNORE INTO server_ops (op_id, server_sequence, device_id, entity_type, entity_id, op_type, payload_json, idempotency_key, client_sequence, last_seen_server_seq, created_at, pushed_at)
+			`INSERT OR IGNORE INTO server_ops (op_id, server_sequence, user_id, vault_id, device_id, entity_type, entity_id, op_type, payload_json, idempotency_key, client_sequence, last_seen_server_seq, created_at, pushed_at)
-			 VALUES (?, NULL, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+			 VALUES (?, NULL, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
-			op.OpID, req.DeviceID, op.EntityType, op.EntityID, op.OpType, op.PayloadJSON,
+			op.OpID, scope.UserID, scope.VaultID, scope.DeviceID, op.EntityType, op.EntityID, op.OpType, op.PayloadJSON,
 			req.IdempotencyKey, op.ClientSequence, op.LastSeenServerSeq, op.CreatedAt, now,
 		)
 		if err != nil {
@@ -404,15 +426,16 @@ func (s *Server) handleSyncPush(w http.ResponseWriter, r *http.Request) {
 		if n == 0 {
 			continue
 		}
-		seqRes, err := s.db.Exec("INSERT INTO server_revisions (op_id, device_id) VALUES (?, ?)", op.OpID, req.DeviceID)
+		seqRes, err := s.db.Exec("INSERT INTO server_revisions (op_id, device_id) VALUES (?, ?)", op.OpID, scope.DeviceID)
 		if err != nil {
 			continue
 		}
 		seq, _ := seqRes.LastInsertId()
 		s.db.Exec("UPDATE server_ops SET server_sequence=? WHERE op_id=?", seq, op.OpID)
 		if op.OpType == "delete" {
-			s.db.Exec(`INSERT OR REPLACE INTO server_tombstones (entity_type, entity_id, op_id, deleted_at) VALUES (?, ?, ?, ?)`,
+			s.db.Exec(`INSERT OR REPLACE INTO server_tombstones
-				op.EntityType, op.EntityID, op.OpID, now)
+				(user_id, vault_id, entity_type, entity_id, op_id, deleted_at) VALUES (?, ?, ?, ?, ?, ?)`,
+				scope.UserID, scope.VaultID, op.EntityType, op.EntityID, op.OpID, now)
 		}
 		accepted = append(accepted, op.OpID)
 	}
@@ -423,15 +446,16 @@ func (s *Server) handleSyncPush(w http.ResponseWriter, r *http.Request) {
 	}
 	if req.IdempotencyKey != "" {
 		if respJSON, err := json.Marshal(resp); err == nil {
-			s.db.Exec("INSERT OR IGNORE INTO server_idempotency_keys (idempotency_key, response_json, created_at) VALUES (?, ?, ?)",
+			s.db.Exec(`INSERT OR IGNORE INTO server_idempotency_keys
-				req.IdempotencyKey, string(respJSON), now)
+				(user_id, vault_id, idempotency_key, response_json, created_at) VALUES (?, ?, ?, ?, ?)`,
+				scope.UserID, scope.VaultID, req.IdempotencyKey, string(respJSON), now)
 		}
 	}
 	jsonOK(w, resp)
 }
 
 func (s *Server) handleSyncPull(w http.ResponseWriter, r *http.Request) {
-	_, _, ok := s.requireAuth(w, r)
+	scope, ok := s.requireSyncScope(w, r)
 	if !ok {
 		return
 	}
@@ -447,14 +471,15 @@ func (s *Server) handleSyncPull(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	var serverSeq int
-	s.db.QueryRow("SELECT COALESCE(MAX(server_sequence), 0) FROM server_ops").Scan(&serverSeq)
+	s.db.QueryRow(`SELECT COALESCE(MAX(server_sequence), 0) FROM server_ops
+		WHERE user_id=? AND vault_id=?`, scope.UserID, scope.VaultID).Scan(&serverSeq)
 	rows, err := s.db.Query(`
 		SELECT op_id, server_sequence, device_id, entity_type, entity_id, op_type, payload_json, created_at
 		FROM server_ops
-		WHERE server_sequence > ? AND server_sequence IS NOT NULL
+		WHERE user_id=? AND vault_id=? AND server_sequence > ? AND server_sequence IS NOT NULL
-		ORDER BY server_sequence`, req.SinceSequence)
+		ORDER BY server_sequence`, scope.UserID, scope.VaultID, req.SinceSequence)
 	if err != nil {
-		jsonErr(w, 500, err.Error())
+		jsonInternalError(w, err)
 		return
 	}
 	defer rows.Close()
@@ -468,7 +493,7 @@ func (s *Server) handleSyncPull(w http.ResponseWriter, r *http.Request) {
 		PayloadJSON    string `json:"payload_json"`
 		CreatedAt      string `json:"created_at"`
 	}
-	var ops []opDTO
+	ops := []opDTO{}
 	for rows.Next() {
 		var o opDTO
 		if err := rows.Scan(&o.OpID, &o.ServerSequence, &o.DeviceID, &o.EntityType, &o.EntityID, &o.OpType, &o.PayloadJSON, &o.CreatedAt); err != nil {
@@ -490,7 +515,7 @@ func (s *Server) handleBlobs(w http.ResponseWriter, r *http.Request) {
 	switch r.Method {
 	case "POST":
 		if err := r.ParseMultipartForm(200 << 20); err != nil {
-			jsonErr(w, 400, "multipart error: "+err.Error())
+			jsonErr(w, 400, "invalid multipart request")
 			return
 		}
 		file, header, err := r.FormFile("file")

internal/server/handlers_auth.go

@@ -56,7 +56,7 @@ func (s *Server) handleRegister(w http.ResponseWriter, r *http.Request) {
 			jsonErr(w, 409, "username or email already taken")
 			return
 		}
-		jsonErr(w, 500, err.Error())
+		jsonInternalError(w, err)
 		return
 	}
 	tok := make([]byte, 24)
@@ -193,24 +193,18 @@ func (s *Server) handleReset(w http.ResponseWriter, r *http.Request) {
 		jsonErr(w, 400, err)
 		return
 	}
-	var userID, expiresAt string
+	_, err := s.resetPasswordWithToken(req.Token, req.NewPassword)
-	err := s.db.QueryRow("SELECT user_id, expires_at FROM server_email_tokens WHERE token=? AND purpose='reset'",
+	if err == errResetTokenInvalid {
-		req.Token).Scan(&userID, &expiresAt)
-	if err != nil {
 		jsonErr(w, 400, "invalid or expired token")
 		return
 	}
-	exp, err := time.Parse(time.RFC3339, expiresAt)
+	if err == errResetTokenExpired {
-	if err != nil || time.Now().After(exp) {
 		jsonErr(w, 400, "token expired")
 		return
 	}
-	hash, err := bcrypt.GenerateFromPassword([]byte(req.NewPassword), bcrypt.DefaultCost)
 	if err != nil {
 		jsonErr(w, 500, "internal error")
 		return
 	}
-	s.db.Exec("UPDATE server_users SET password_hash=? WHERE id=?", string(hash), userID)
-	s.db.Exec("DELETE FROM server_email_tokens WHERE token=?", req.Token)
 	jsonOK(w, map[string]string{"status": "password reset"})
 }

internal/server/handlers_web_user.go

@@ -4,8 +4,11 @@ import (
 	"crypto/rand"
 	"encoding/hex"
 	"fmt"
+	"html"
 	"log"
 	"net/http"
+	"net/url"
+	"strconv"
 	"strings"
 	"time"
 
@@ -75,8 +78,9 @@ func (s *Server) handleUserWebRegister(w http.ResponseWriter, r *http.Request) {
 				w.WriteHeader(409)
 				w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), "Username or email already taken", "/register")))
 			} else {
+				log.Printf("register web: create user failed: %v", err)
 				w.WriteHeader(500)
-				w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), err.Error(), "/register")))
+				w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), t(locale, "server.registrationFailed"), "/register")))
 			}
 			return
 		}
@@ -187,8 +191,8 @@ func (s *Server) handleUserWebReset(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 		w.Header().Set("Content-Type", "text/html; charset=utf-8")
-		html := strings.ReplaceAll(resetPasswordHTML(locale), "{TOKEN}", token)
+		page := strings.ReplaceAll(resetPasswordHTML(locale), "{TOKEN}", html.EscapeString(token))
-		w.Write([]byte(html))
+		w.Write([]byte(page))
 	case "POST":
 		if err := r.ParseForm(); err != nil {
 			jsonErr(w, 400, "bad form")
@@ -204,23 +208,25 @@ func (s *Server) handleUserWebReset(w http.ResponseWriter, r *http.Request) {
 		}
 		if err := validatePassword(newPass); err != "" {
 			w.Header().Set("Content-Type", "text/html; charset=utf-8")
-			w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), string(err), "/reset?token="+token)))
+			w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), string(err), "/reset?token="+url.QueryEscape(token))))
 			return
 		}
 		if newPass != confirm {
 			w.Header().Set("Content-Type", "text/html; charset=utf-8")
-			w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), t(locale, "server.passwordsDoNotMatch"), "/reset?token="+token)))
+			w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), t(locale, "server.passwordsDoNotMatch"), "/reset?token="+url.QueryEscape(token))))
 			return
 		}
-		var userID string
+		userID, err := s.resetPasswordWithToken(token, newPass)
-		err := s.db.QueryRow("SELECT user_id FROM server_email_tokens WHERE token=? AND purpose='reset'", token).Scan(&userID)
+		if err == errResetTokenInvalid || err == errResetTokenExpired {
-		if err != nil {
 			http.Redirect(w, r, "/forgot", http.StatusFound)
 			return
 		}
-		hash, _ := bcrypt.GenerateFromPassword([]byte(newPass), bcrypt.DefaultCost)
+		if err != nil {
-		s.db.Exec("UPDATE server_users SET password_hash=? WHERE id=?", string(hash), userID)
+			w.Header().Set("Content-Type", "text/html; charset=utf-8")
-		s.db.Exec("DELETE FROM server_email_tokens WHERE token=?", token)
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte(errorPageHTML(locale, t(locale, "common.error"), t(locale, "common.error"), "/forgot")))
+			return
+		}
 		log.Printf("reset: user %s reset password", userID)
 		w.Header().Set("Content-Type", "text/html; charset=utf-8")
 		w.Write([]byte(resetDoneHTML(locale)))
@@ -308,7 +314,7 @@ func (s *Server) handleUserDashboard(w http.ResponseWriter, r *http.Request) {
 				created = created[:10]
 			}
 			status := "<span style='color:#34d399'>" + t(locale, "userDashboard.active") + "</span>"
-			revokeBtn := fmt.Sprintf(`<button class="btn btn-danger btn-sm" onclick="revokeDevice('%s')">%s</button>`, d.ID, t(locale, "userDashboard.revoke"))
+			revokeBtn := fmt.Sprintf(`<button class="btn btn-danger btn-sm" onclick="revokeDevice(%s)">%s</button>`, html.EscapeString(strconv.Quote(d.ID)), t(locale, "userDashboard.revoke"))
 			if d.RevokedAt != "" {
 				status = "<span style='color:#ff6b6b'>" + t(locale, "userDashboard.revoked") + "</span>"
 				revokeBtn = ""
@@ -319,11 +325,11 @@ func (s *Server) handleUserDashboard(w http.ResponseWriter, r *http.Request) {
 				<td>%s</td>
 				<td>%s</td>
 				<td>%s %s</td>
-			</tr>`, d.Name, status, created, ls, d.ClientVer, revokeBtn)
+			</tr>`, html.EscapeString(d.Name), status, html.EscapeString(created), html.EscapeString(ls), html.EscapeString(d.ClientVer), revokeBtn)
 		}
 	}
 
-	w.Write([]byte(userDashboardHTML(locale, username, deviceRows)))
+	w.Write([]byte(userDashboardHTML(locale, html.EscapeString(username), deviceRows)))
 }
 
 func (s *Server) handleUserWebLogout(w http.ResponseWriter, r *http.Request) {
@@ -347,7 +353,7 @@ func (s *Server) handleUserDevices(w http.ResponseWriter, r *http.Request) {
 		WHERE ud.user_id = ?
 		ORDER BY d.created_at DESC`, userID)
 	if err != nil {
-		jsonErr(w, 500, err.Error())
+		jsonInternalError(w, err)
 		return
 	}
 	defer rows.Close()

internal/server/helpers.go

@@ -4,6 +4,7 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
+	"log"
 	"net/http"
 )
 
@@ -18,6 +19,11 @@ func jsonErr(w http.ResponseWriter, code int, msg string) {
 	json.NewEncoder(w).Encode(map[string]string{"error": msg})
 }
 
+func jsonInternalError(w http.ResponseWriter, err error) {
+	log.Printf("request failed: %v", err)
+	jsonErr(w, http.StatusInternalServerError, "internal error")
+}
+
 func sha256Hex(s string) string {
 	h := sha256.Sum256([]byte(s))
 	return hex.EncodeToString(h[:])

internal/server/locale.go

@@ -16,253 +16,263 @@ func t(locale, key string) string {
 
 var _translations = map[string]map[string]string{
 	"ru": {
-		"server.registerTitle":         "Регистрация",
+		"server.registerTitle":           "Регистрация",
-		"server.register":              "Регистрация",
+		"server.register":                "Регистрация",
-		"server.username":              "Имя пользователя",
+		"server.username":                "Имя пользователя",
-		"server.email":                 "Email",
+		"server.email":                   "Email",
-		"server.password":              "Пароль",
+		"server.password":                "Пароль",
-		"server.registerBtn":           "Зарегистрироваться",
+		"server.registerBtn":             "Зарегистрироваться",
-		"server.alreadyHaveAccount":    "Уже есть аккаунт?",
+		"server.alreadyHaveAccount":      "Уже есть аккаунт?",
-		"server.loginBtn":              "Войти",
+		"server.loginBtn":                "Войти",
-		"server.loginTitle":            "Вход",
+		"server.loginTitle":              "Вход",
-		"server.usernameOrEmail":       "Имя пользователя или email",
+		"server.usernameOrEmail":         "Имя пользователя или email",
-		"server.forgotPassword":        "Забыли пароль?",
+		"server.forgotPassword":          "Забыли пароль?",
-		"server.adminLink":             "Админ",
+		"server.adminLink":               "Админ",
-		"server.dashboard":             "Панель управления",
+		"server.dashboard":               "Панель управления",
-		"server.allFieldsRequired":     "Все поля обязательны",
+		"server.allFieldsRequired":       "Все поля обязательны",
-		"server.back":                  "Назад",
+		"server.back":                    "Назад",
-		"server.emailConfirmBody":      "Подтвердите регистрацию: %s",
+		"server.emailConfirmBody":        "Подтвердите регистрацию: %s",
-		"server.emailConfirmSubject":   "Verstak — подтверждение email",
+		"server.emailConfirmSubject":     "Verstak — подтверждение email",
-		"server.registrationSuccess":   "Регистрация успешна",
+		"server.registrationSuccess":     "Регистрация успешна",
-		"server.registrationEmailSent": "Письмо с ссылкой подтверждения отправлено.",
+		"server.registrationEmailSent":   "Письмо с ссылкой подтверждения отправлено.",
-		"server.registrationCheckEmail":"Проверьте почту и подтвердите аккаунт.",
+		"server.registrationCheckEmail":  "Проверьте почту и подтвердите аккаунт.",
-		"server.registrationAutoMessage":"Email не подтверждается. Токен подтверждения выведен в лог сервера.",
+		"server.registrationAutoMessage": "Email не подтверждается. Токен подтверждения выведен в лог сервера.",
-		"server.resetPasswordTitle":    "Сброс пароля",
+		"server.resetPasswordTitle":      "Сброс пароля",
-		"server.resetPassword":         "Сброс пароля",
+		"server.resetPassword":           "Сброс пароля",
-		"server.resetInstruction":      "Введите email для получения ссылки сброса.",
+		"server.resetInstruction":        "Введите email для получения ссылки сброса.",
-		"server.sendLink":              "Отправить ссылку",
+		"server.sendLink":                "Отправить ссылку",
-		"server.backToLogin":           "Вернуться к входу",
+		"server.backToLogin":             "Вернуться к входу",
-		"server.emailSentTitle":        "Письмо отправлено",
+		"server.emailSentTitle":          "Письмо отправлено",
-		"server.emailSent":             "Письмо отправлено",
+		"server.emailSent":               "Письмо отправлено",
-		"server.emailSentMessage":      "Если аккаунт существует, ссылка для сброса пароля отправлена на почту.",
+		"server.emailSentMessage":        "Если аккаунт существует, ссылка для сброса пароля отправлена на почту.",
-		"server.goHome":                "На главную",
+		"server.goHome":                  "На главную",
-		"server.newPasswordTitle":      "Новый пароль",
+		"server.newPasswordTitle":        "Новый пароль",
-		"server.newPassword":           "Новый пароль",
+		"server.newPassword":             "Новый пароль",
-		"server.passwordConfirm":       "Подтвердите пароль",
+		"server.passwordConfirm":         "Подтвердите пароль",
-		"server.save":                  "Сохранить",
+		"server.save":                    "Сохранить",
-		"server.passwordChanged":       "Пароль изменён",
+		"server.passwordChanged":         "Пароль изменён",
-		"server.passwordChangedMessage":"Пароль успешно изменён. Теперь можно войти.",
+		"server.passwordChangedMessage":  "Пароль успешно изменён. Теперь можно войти.",
-		"server.emailConfirmed":        "Email подтверждён",
+		"server.emailConfirmed":          "Email подтверждён",
-		"server.emailConfirmedMessage": "Аккаунт активирован. Теперь можно войти.",
+		"server.emailConfirmedMessage":   "Аккаунт активирован. Теперь можно войти.",
-		"server.needEmail":             "Введите email",
+		"server.needEmail":               "Введите email",
-		"server.passwordsDoNotMatch":   "Пароли не совпадают",
+		"server.passwordsDoNotMatch":     "Пароли не совпадают",
-		"server.newPasswordResult":     "Новый пароль для %s:\n",
+		"server.newPasswordResult":       "Новый пароль для %s:\n",
-		"server.logout":                "Выйти",
+		"server.logout":                  "Выйти",
-		"server.error":                 "Ошибка",
+		"server.error":                   "Ошибка",
-		"userDashboard.devices":        "Устройства",
+		"server.internalError":           "Что-то пошло не так. Повторите попытку.",
-		"userDashboard.device":         "Устройство",
+		"server.registrationFailed":      "Не удалось зарегистрировать аккаунт. Повторите попытку.",
-		"userDashboard.status":         "Статус",
+		"userDashboard.devices":          "Устройства",
-		"userDashboard.connected":      "Подключено",
+		"userDashboard.device":           "Устройство",
-		"userDashboard.lastSeen":       "Последний раз",
+		"userDashboard.status":           "Статус",
-		"userDashboard.version":        "Версия",
+		"userDashboard.connected":        "Подключено",
-		"userDashboard.connectNew":     "Подключить новое устройство",
+		"userDashboard.lastSeen":         "Последний раз",
-		"userDashboard.connectNewHint": "Установите Верстак на новом устройстве и выполните регистрацию.",
+		"userDashboard.version":          "Версия",
-		"userDashboard.revokeConfirm":  "Отозвать устройство?",
+		"userDashboard.connectNew":       "Подключить новое устройство",
-		"userDashboard.revokePrompt":   "Введите пароль для подтверждения:",
+		"userDashboard.connectNewHint":   "Установите Верстак на новом устройстве и выполните регистрацию.",
-		"userDashboard.noDevices":      "Нет устройств",
+		"userDashboard.revokeConfirm":    "Отозвать устройство?",
-		"userDashboard.active":         "Активно",
+		"userDashboard.revokePrompt":     "Введите пароль для подтверждения:",
-		"userDashboard.revoked":        "Отозвано",
+		"userDashboard.noDevices":        "Нет устройств",
-		"userDashboard.revoke":         "Отозвать",
+		"userDashboard.active":           "Активно",
-		"admin.login":                  "Вход администратора",
+		"userDashboard.revoked":          "Отозвано",
-		"admin.username":               "Имя пользователя",
+		"userDashboard.revoke":           "Отозвать",
-		"admin.password":               "Пароль",
+		"admin.login":                    "Вход администратора",
-		"admin.loginBtn":               "Войти",
+		"admin.username":                 "Имя пользователя",
-		"admin.dashboard":              "Панель управления",
+		"admin.password":                 "Пароль",
-		"admin.deviceCount":            "Устройств",
+		"admin.loginBtn":                 "Войти",
-		"admin.opsCount":               "Операций",
+		"admin.dashboard":                "Панель управления",
-		"admin.devices":                "Устройства",
+		"admin.deviceCount":              "Устройств",
-		"admin.noDevices":              "Нет устройств",
+		"admin.opsCount":                 "Операций",
-		"admin.device":                 "Устройство",
+		"admin.devices":                  "Устройства",
-		"admin.user":                   "Пользователь",
+		"admin.noDevices":                "Нет устройств",
-		"admin.version":                "Версия",
+		"admin.device":                   "Устройство",
-		"admin.status":                 "Статус",
+		"admin.user":                     "Пользователь",
-		"admin.lastSeen":               "Последний раз",
+		"admin.version":                  "Версия",
-		"admin.active":                 "Активно",
+		"admin.status":                   "Статус",
-		"admin.revoked":                "Отозвано",
+		"admin.lastSeen":                 "Последний раз",
-		"admin.revoke":                 "Отозвать",
+		"admin.active":                   "Активно",
-		"admin.smtp":                   "SMTP",
+		"admin.revoked":                  "Отозвано",
-		"admin.users":                  "Пользователи",
+		"admin.revoke":                   "Отозвать",
-		"admin.usersHeading":           "Пользователи",
+		"admin.smtp":                     "SMTP",
-		"admin.healthCheck":            "Проверка здоровья",
+		"admin.users":                    "Пользователи",
-		"admin.smtpServer":             "SMTP сервер",
+		"admin.usersHeading":             "Пользователи",
-		"admin.smtpPort":               "SMTP порт",
+		"admin.healthCheck":              "Проверка здоровья",
-		"admin.smtpType":               "Тип шифрования",
+		"admin.smtpServer":               "SMTP сервер",
-		"admin.smtpNoEncryption":       "Без шифрования",
+		"admin.smtpPort":                 "SMTP порт",
-		"admin.smtpUsername":           "Имя пользователя SMTP",
+		"admin.smtpType":                 "Тип шифрования",
-		"admin.smtpPassword":           "Пароль SMTP",
+		"admin.smtpNoEncryption":         "Без шифрования",
-		"admin.smtpFrom":               "Отправитель",
+		"admin.smtpUsername":             "Имя пользователя SMTP",
-		"admin.smtpServerURL":          "URL сервера",
+		"admin.smtpPassword":             "Пароль SMTP",
-		"admin.smtpSave":               "Сохранить",
+		"admin.smtpFrom":                 "Отправитель",
-		"admin.smtpTest":               "Тест",
+		"admin.smtpServerURL":            "URL сервера",
-		"admin.smtpTitle":              "Настройки SMTP",
+		"admin.smtpSave":                 "Сохранить",
-		"admin.smtpTesting":            "Проверка...",
+		"admin.smtpTest":                 "Тест",
-		"admin.smtpPassed":             "✓ Тест пройден",
+		"admin.smtpTitle":                "Настройки SMTP",
-		"admin.revokeConfirm":          "Вы уверены?",
+		"admin.smtpTesting":              "Проверка...",
-		"common.loading":               "Загрузка...",
+		"admin.smtpPassed":               "✓ Тест пройден",
-		"common.ok":                    "OK",
+		"admin.smtpRequired":             "Укажите SMTP-сервер, порт и отправителя.",
-		"common.error":                 "Ошибка",
+		"admin.smtpTestFailed":           "Не удалось проверить настройки SMTP. Повторите попытку.",
-		"admin.filterPlaceholder":      "Поиск...",
+		"admin.revokeConfirm":            "Вы уверены?",
-		"admin.email":                  "Email",
+		"common.loading":                 "Загрузка...",
-		"admin.actions":                "Действия",
+		"common.ok":                      "OK",
-		"admin.confirmTitle":           "Подтверждение",
+		"common.error":                   "Ошибка",
-		"admin.modalCancel":            "Отмена",
+		"admin.filterPlaceholder":        "Поиск...",
-		"admin.modalConfirm":           "Подтвердить",
+		"admin.email":                    "Email",
-		"admin.editUser":               "Редактировать пользователя",
+		"admin.actions":                  "Действия",
-		"admin.editBtn":                "Сохранить",
+		"admin.confirmTitle":             "Подтверждение",
-		"admin.resultTitle":            "Результат",
+		"admin.modalCancel":              "Отмена",
-		"admin.confirmed":              "Подтверждён",
+		"admin.modalConfirm":             "Подтвердить",
-		"admin.unconfirmed":            "Не подтверждён",
+		"admin.editUser":                 "Редактировать пользователя",
-		"admin.blocked":                "Заблокирован",
+		"admin.editBtn":                  "Сохранить",
-		"admin.unblock":                "Разблокировать",
+		"admin.resultTitle":              "Результат",
-		"admin.block":                  "Заблокировать",
+		"admin.confirmed":                "Подтверждён",
-		"admin.resetPassword":          "Сбросить пароль",
+		"admin.unconfirmed":              "Не подтверждён",
-		"admin.noUsers":                "Нет пользователей",
+		"admin.blocked":                  "Заблокирован",
-		"admin.resetPasswordConfirm":   "Сбросить пароль",
+		"admin.unblock":                  "Разблокировать",
-		"admin.resetPasswordMessage":   "Новый пароль: ",
+		"admin.block":                    "Заблокировать",
-		"admin.resetBtn":               "Сбросить",
+		"admin.resetPassword":            "Сбросить пароль",
-		"admin.deleteUser":             "Удалить",
+		"admin.noUsers":                  "Нет пользователей",
-		"admin.deleteUserMessage":      "Удалить пользователя %s?",
+		"admin.resetPasswordConfirm":     "Сбросить пароль",
-		"admin.deleteBtn":              "Удалить",
+		"admin.resetPasswordMessage":     "Новый пароль: ",
-		"admin.unblockUserTitle":       "Разблокировать",
+		"admin.resetBtn":                 "Сбросить",
-		"admin.blockUserTitle":         "Заблокировать",
+		"admin.deleteUser":               "Удалить",
-		"admin.unblockUserMessage":     "Разблокировать пользователя?",
+		"admin.deleteUserMessage":        "Удалить пользователя %s?",
-		"admin.blockUserMessage":       "Заблокировать пользователя?",
+		"admin.deleteBtn":                "Удалить",
-		"admin.createUser":             "Создать пользователя",
+		"admin.unblockUserTitle":         "Разблокировать",
-		"admin.createUserBtn":          "Создать",
+		"admin.blockUserTitle":           "Заблокировать",
+		"admin.unblockUserMessage":       "Разблокировать пользователя?",
+		"admin.blockUserMessage":         "Заблокировать пользователя?",
+		"admin.createUser":               "Создать пользователя",
+		"admin.createUserBtn":            "Создать",
+		"admin.createUserFailed":         "Не удалось создать пользователя. Повторите попытку.",
 	},
 	"en": {
-		"server.registerTitle":         "Registration",
+		"server.registerTitle":           "Registration",
-		"server.register":              "Register",
+		"server.register":                "Register",
-		"server.username":              "Username",
+		"server.username":                "Username",
-		"server.email":                 "Email",
+		"server.email":                   "Email",
-		"server.password":              "Password",
+		"server.password":                "Password",
-		"server.registerBtn":           "Register",
+		"server.registerBtn":             "Register",
-		"server.alreadyHaveAccount":    "Already have an account?",
+		"server.alreadyHaveAccount":      "Already have an account?",
-		"server.loginBtn":              "Login",
+		"server.loginBtn":                "Login",
-		"server.loginTitle":            "Login",
+		"server.loginTitle":              "Login",
-		"server.usernameOrEmail":       "Username or email",
+		"server.usernameOrEmail":         "Username or email",
-		"server.forgotPassword":        "Forgot password?",
+		"server.forgotPassword":          "Forgot password?",
-		"server.adminLink":             "Admin",
+		"server.adminLink":               "Admin",
-		"server.dashboard":             "Dashboard",
+		"server.dashboard":               "Dashboard",
-		"server.allFieldsRequired":     "All fields are required",
+		"server.allFieldsRequired":       "All fields are required",
-		"server.back":                  "Back",
+		"server.back":                    "Back",
-		"server.emailConfirmBody":      "Confirm registration: %s",
+		"server.emailConfirmBody":        "Confirm registration: %s",
-		"server.emailConfirmSubject":   "Verstak — email confirmation",
+		"server.emailConfirmSubject":     "Verstak — email confirmation",
-		"server.registrationSuccess":   "Registration successful",
+		"server.registrationSuccess":     "Registration successful",
-		"server.registrationEmailSent": "Confirmation link has been sent.",
+		"server.registrationEmailSent":   "Confirmation link has been sent.",
-		"server.registrationCheckEmail":"Check your email and confirm your account.",
+		"server.registrationCheckEmail":  "Check your email and confirm your account.",
-		"server.registrationAutoMessage":"Email is not confirmed. Confirmation token logged to server.",
+		"server.registrationAutoMessage": "Email is not confirmed. Confirmation token logged to server.",
-		"server.resetPasswordTitle":    "Reset Password",
+		"server.resetPasswordTitle":      "Reset Password",
-		"server.resetPassword":         "Reset Password",
+		"server.resetPassword":           "Reset Password",
-		"server.resetInstruction":      "Enter your email to receive a reset link.",
+		"server.resetInstruction":        "Enter your email to receive a reset link.",
-		"server.sendLink":              "Send link",
+		"server.sendLink":                "Send link",
-		"server.backToLogin":           "Back to login",
+		"server.backToLogin":             "Back to login",
-		"server.emailSentTitle":        "Email sent",
+		"server.emailSentTitle":          "Email sent",
-		"server.emailSent":             "Email sent",
+		"server.emailSent":               "Email sent",
-		"server.emailSentMessage":      "If the account exists, a reset link has been sent.",
+		"server.emailSentMessage":        "If the account exists, a reset link has been sent.",
-		"server.goHome":                "Go home",
+		"server.goHome":                  "Go home",
-		"server.newPasswordTitle":      "New Password",
+		"server.newPasswordTitle":        "New Password",
-		"server.newPassword":           "New Password",
+		"server.newPassword":             "New Password",
-		"server.passwordConfirm":       "Confirm Password",
+		"server.passwordConfirm":         "Confirm Password",
-		"server.save":                  "Save",
+		"server.save":                    "Save",
-		"server.passwordChanged":       "Password changed",
+		"server.passwordChanged":         "Password changed",
-		"server.passwordChangedMessage":"Password has been changed. You can now login.",
+		"server.passwordChangedMessage":  "Password has been changed. You can now login.",
-		"server.emailConfirmed":        "Email confirmed",
+		"server.emailConfirmed":          "Email confirmed",
-		"server.emailConfirmedMessage": "Account activated. You can now login.",
+		"server.emailConfirmedMessage":   "Account activated. You can now login.",
-		"server.needEmail":             "Enter email",
+		"server.needEmail":               "Enter email",
-		"server.passwordsDoNotMatch":   "Passwords do not match",
+		"server.passwordsDoNotMatch":     "Passwords do not match",
-		"server.newPasswordResult":     "New password for %s:\n",
+		"server.newPasswordResult":       "New password for %s:\n",
-		"server.logout":                "Logout",
+		"server.logout":                  "Logout",
-		"server.error":                 "Error",
+		"server.error":                   "Error",
-		"userDashboard.devices":        "Devices",
+		"server.internalError":           "Something went wrong. Please try again.",
-		"userDashboard.device":         "Device",
+		"server.registrationFailed":      "Could not register the account. Please try again.",
-		"userDashboard.status":         "Status",
+		"userDashboard.devices":          "Devices",
-		"userDashboard.connected":      "Connected",
+		"userDashboard.device":           "Device",
-		"userDashboard.lastSeen":       "Last seen",
+		"userDashboard.status":           "Status",
-		"userDashboard.version":        "Version",
+		"userDashboard.connected":        "Connected",
-		"userDashboard.connectNew":     "Connect new device",
+		"userDashboard.lastSeen":         "Last seen",
-		"userDashboard.connectNewHint": "Install Verstak on a new device and register it.",
+		"userDashboard.version":          "Version",
-		"userDashboard.revokeConfirm":  "Revoke device?",
+		"userDashboard.connectNew":       "Connect new device",
-		"userDashboard.revokePrompt":   "Enter password to confirm:",
+		"userDashboard.connectNewHint":   "Install Verstak on a new device and register it.",
-		"userDashboard.noDevices":      "No devices",
+		"userDashboard.revokeConfirm":    "Revoke device?",
-		"userDashboard.active":         "Active",
+		"userDashboard.revokePrompt":     "Enter password to confirm:",
-		"userDashboard.revoked":        "Revoked",
+		"userDashboard.noDevices":        "No devices",
-		"userDashboard.revoke":         "Revoke",
+		"userDashboard.active":           "Active",
-		"admin.login":                  "Admin Login",
+		"userDashboard.revoked":          "Revoked",
-		"admin.username":               "Username",
+		"userDashboard.revoke":           "Revoke",
-		"admin.password":               "Password",
+		"admin.login":                    "Admin Login",
-		"admin.loginBtn":               "Login",
+		"admin.username":                 "Username",
-		"admin.dashboard":              "Admin Dashboard",
+		"admin.password":                 "Password",
-		"admin.deviceCount":            "Devices",
+		"admin.loginBtn":                 "Login",
-		"admin.opsCount":               "Operations",
+		"admin.dashboard":                "Admin Dashboard",
-		"admin.devices":                "Devices",
+		"admin.deviceCount":              "Devices",
-		"admin.noDevices":              "No devices",
+		"admin.opsCount":                 "Operations",
-		"admin.device":                 "Device",
+		"admin.devices":                  "Devices",
-		"admin.user":                   "User",
+		"admin.noDevices":                "No devices",
-		"admin.version":                "Version",
+		"admin.device":                   "Device",
-		"admin.status":                 "Status",
+		"admin.user":                     "User",
-		"admin.lastSeen":               "Last seen",
+		"admin.version":                  "Version",
-		"admin.active":                 "Active",
+		"admin.status":                   "Status",
-		"admin.revoked":                "Revoked",
+		"admin.lastSeen":                 "Last seen",
-		"admin.revoke":                 "Revoke",
+		"admin.active":                   "Active",
-		"admin.smtp":                   "SMTP",
+		"admin.revoked":                  "Revoked",
-		"admin.users":                  "Users",
+		"admin.revoke":                   "Revoke",
-		"admin.usersHeading":           "Users",
+		"admin.smtp":                     "SMTP",
-		"admin.healthCheck":            "Health Check",
+		"admin.users":                    "Users",
-		"admin.smtpServer":             "SMTP Server",
+		"admin.usersHeading":             "Users",
-		"admin.smtpPort":               "SMTP Port",
+		"admin.healthCheck":              "Health Check",
-		"admin.smtpType":               "Encryption",
+		"admin.smtpServer":               "SMTP Server",
-		"admin.smtpNoEncryption":       "None",
+		"admin.smtpPort":                 "SMTP Port",
-		"admin.smtpUsername":           "SMTP Username",
+		"admin.smtpType":                 "Encryption",
-		"admin.smtpPassword":           "SMTP Password",
+		"admin.smtpNoEncryption":         "None",
-		"admin.smtpFrom":               "From",
+		"admin.smtpUsername":             "SMTP Username",
-		"admin.smtpServerURL":          "Server URL",
+		"admin.smtpPassword":             "SMTP Password",
-		"admin.smtpSave":               "Save",
+		"admin.smtpFrom":                 "From",
-		"admin.smtpTest":               "Test",
+		"admin.smtpServerURL":            "Server URL",
-		"admin.smtpTitle":              "SMTP Settings",
+		"admin.smtpSave":                 "Save",
-		"admin.smtpTesting":            "Testing...",
+		"admin.smtpTest":                 "Test",
-		"admin.smtpPassed":             "✓ Test passed",
+		"admin.smtpTitle":                "SMTP Settings",
-		"admin.revokeConfirm":          "Are you sure?",
+		"admin.smtpTesting":              "Testing...",
-		"common.loading":               "Loading...",
+		"admin.smtpPassed":               "✓ Test passed",
-		"common.ok":                    "OK",
+		"admin.smtpRequired":             "Enter the SMTP server, port, and sender.",
-		"common.error":                 "Error",
+		"admin.smtpTestFailed":           "Could not test the SMTP settings. Please try again.",
-		"admin.filterPlaceholder":      "Search...",
+		"admin.revokeConfirm":            "Are you sure?",
-		"admin.email":                  "Email",
+		"common.loading":                 "Loading...",
-		"admin.actions":                "Actions",
+		"common.ok":                      "OK",
-		"admin.confirmTitle":           "Confirm",
+		"common.error":                   "Error",
-		"admin.modalCancel":            "Cancel",
+		"admin.filterPlaceholder":        "Search...",
-		"admin.modalConfirm":           "Confirm",
+		"admin.email":                    "Email",
-		"admin.editUser":               "Edit User",
+		"admin.actions":                  "Actions",
-		"admin.editBtn":                "Save",
+		"admin.confirmTitle":             "Confirm",
-		"admin.resultTitle":            "Result",
+		"admin.modalCancel":              "Cancel",
-		"admin.confirmed":              "Confirmed",
+		"admin.modalConfirm":             "Confirm",
-		"admin.unconfirmed":            "Unconfirmed",
+		"admin.editUser":                 "Edit User",
-		"admin.blocked":                "Blocked",
+		"admin.editBtn":                  "Save",
-		"admin.unblock":                "Unblock",
+		"admin.resultTitle":              "Result",
-		"admin.block":                  "Block",
+		"admin.confirmed":                "Confirmed",
-		"admin.resetPassword":          "Reset Password",
+		"admin.unconfirmed":              "Unconfirmed",
-		"admin.noUsers":                "No users",
+		"admin.blocked":                  "Blocked",
-		"admin.resetPasswordConfirm":   "Reset Password",
+		"admin.unblock":                  "Unblock",
-		"admin.resetPasswordMessage":   "New password: ",
+		"admin.block":                    "Block",
-		"admin.resetBtn":               "Reset",
+		"admin.resetPassword":            "Reset Password",
-		"admin.deleteUser":             "Delete",
+		"admin.noUsers":                  "No users",
-		"admin.deleteUserMessage":      "Delete user %s?",
+		"admin.resetPasswordConfirm":     "Reset Password",
-		"admin.deleteBtn":              "Delete",
+		"admin.resetPasswordMessage":     "New password: ",
-		"admin.unblockUserTitle":       "Unblock",
+		"admin.resetBtn":                 "Reset",
-		"admin.blockUserTitle":         "Block",
+		"admin.deleteUser":               "Delete",
-		"admin.unblockUserMessage":     "Unblock user?",
+		"admin.deleteUserMessage":        "Delete user %s?",
-		"admin.blockUserMessage":       "Block user?",
+		"admin.deleteBtn":                "Delete",
-		"admin.createUser":             "Create User",
+		"admin.unblockUserTitle":         "Unblock",
-		"admin.createUserBtn":          "Create",
+		"admin.blockUserTitle":           "Block",
+		"admin.unblockUserMessage":       "Unblock user?",
+		"admin.blockUserMessage":         "Block user?",
+		"admin.createUser":               "Create User",
+		"admin.createUserBtn":            "Create",
+		"admin.createUserFailed":         "Could not create the user. Please try again.",
 	},
 }

internal/server/middleware.go

@@ -7,7 +7,38 @@ import (
 	"time"
 )
 
+type authenticatedDevice struct {
+	DeviceID string
+	UserID   string
+	VaultID  string
+}
+
 func (s *Server) requireAuth(w http.ResponseWriter, r *http.Request) (deviceID, userID string, ok bool) {
+	device, ok := s.authenticateDevice(w, r)
+	if !ok {
+		return "", "", false
+	}
+	return device.DeviceID, device.UserID, true
+}
+
+func (s *Server) requireSyncScope(w http.ResponseWriter, r *http.Request) (authenticatedDevice, bool) {
+	device, ok := s.authenticateDevice(w, r)
+	if !ok {
+		return authenticatedDevice{}, false
+	}
+	if device.UserID == "" {
+		jsonErr(w, http.StatusForbidden, "device is not associated with a user")
+		return authenticatedDevice{}, false
+	}
+	device.VaultID = effectiveVaultScope(device.UserID, device.VaultID)
+	if device.VaultID == "" {
+		jsonErr(w, http.StatusForbidden, "device is not associated with a vault")
+		return authenticatedDevice{}, false
+	}
+	return device, true
+}
+
+func (s *Server) authenticateDevice(w http.ResponseWriter, r *http.Request) (authenticatedDevice, bool) {
 	key := r.Header.Get("Authorization")
 	key = strings.TrimPrefix(key, "Bearer ")
 	if key == "" {
@@ -15,34 +46,43 @@ func (s *Server) requireAuth(w http.ResponseWriter, r *http.Request) (deviceID,
 	}
 	if key == "" {
 		jsonErr(w, 401, "API key required")
-		return "", "", false
+		return authenticatedDevice{}, false
 	}
-	hash := sha256Hex(key)
+
-	var deviceIDVal, userIDVal, revokedAt sql.NullString
+	var device authenticatedDevice
-	err := s.db.QueryRow("SELECT id, user_id, revoked_at FROM server_devices WHERE token_hash=?", hash).Scan(&deviceIDVal, &userIDVal, &revokedAt)
+	var userID, vaultID, revokedAt sql.NullString
-	if err == nil {
+	err := s.db.QueryRow(`SELECT id, user_id, vault_id, revoked_at
-		if revokedAt.Valid && revokedAt.String != "" {
+		FROM server_devices WHERE token_hash=?`, sha256Hex(key)).
-			jsonErr(w, 401, "device revoked")
+		Scan(&device.DeviceID, &userID, &vaultID, &revokedAt)
-			return "", "", false
+	if err != nil {
-		}
+		err = s.db.QueryRow(`SELECT id, user_id, vault_id, revoked_at
-		if userIDVal.Valid && userIDVal.String != "" {
+			FROM server_devices WHERE api_key=?`, key).
-			var blocked int
+			Scan(&device.DeviceID, &userID, &vaultID, &revokedAt)
-			s.db.QueryRow("SELECT blocked FROM server_users WHERE id=?", userIDVal.String).Scan(&blocked)
-			if blocked != 0 {
-				jsonErr(w, 403, "user blocked")
-				return "", "", false
-			}
-		}
-		s.db.Exec("UPDATE server_devices SET last_seen=? WHERE id=?", time.Now().UTC().Format(time.RFC3339), deviceIDVal.String)
-		return deviceIDVal.String, userIDVal.String, true
 	}
-	var count int
+	if err != nil {
-	err = s.db.QueryRow("SELECT COUNT(*) FROM server_devices WHERE api_key=?", key).Scan(&count)
-	if err != nil || count == 0 {
 		jsonErr(w, 401, "invalid API key")
-		return "", "", false
+		return authenticatedDevice{}, false
 	}
-	return "", "", true
+	if revokedAt.Valid && revokedAt.String != "" {
+		jsonErr(w, 401, "device revoked")
+		return authenticatedDevice{}, false
+	}
+	if userID.Valid {
+		device.UserID = userID.String
+	}
+	if vaultID.Valid {
+		device.VaultID = vaultID.String
+	}
+	if device.UserID != "" {
+		var blocked int
+		s.db.QueryRow("SELECT blocked FROM server_users WHERE id=?", device.UserID).Scan(&blocked)
+		if blocked != 0 {
+			jsonErr(w, 403, "user blocked")
+			return authenticatedDevice{}, false
+		}
+	}
+	s.db.Exec("UPDATE server_devices SET last_seen=? WHERE id=?", time.Now().UTC().Format(time.RFC3339), device.DeviceID)
+	return device, true
 }
 
 func (s *Server) requireAdmin(w http.ResponseWriter, r *http.Request) bool {

internal/server/password_reset.go

@@ -0,0 +1,69 @@
+package server
+
+import (
+	"database/sql"
+	"errors"
+	"time"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+var (
+	errResetTokenInvalid = errors.New("invalid reset token")
+	errResetTokenExpired = errors.New("expired reset token")
+)
+
+func (s *Server) resetPasswordWithToken(token, newPassword string) (string, error) {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return "", err
+	}
+	defer tx.Rollback()
+
+	var userID, expiresAt string
+	err = tx.QueryRow(`SELECT user_id, expires_at FROM server_email_tokens
+		WHERE token=? AND purpose='reset'`, token).Scan(&userID, &expiresAt)
+	if errors.Is(err, sql.ErrNoRows) {
+		return "", errResetTokenInvalid
+	}
+	if err != nil {
+		return "", err
+	}
+	expiresAtTime, err := time.Parse(time.RFC3339, expiresAt)
+	if err != nil || !time.Now().Before(expiresAtTime) {
+		return "", errResetTokenExpired
+	}
+
+	deleted, err := tx.Exec(`DELETE FROM server_email_tokens
+		WHERE token=? AND purpose='reset' AND expires_at=?`, token, expiresAt)
+	if err != nil {
+		return "", err
+	}
+	deletedCount, err := deleted.RowsAffected()
+	if err != nil {
+		return "", err
+	}
+	if deletedCount != 1 {
+		return "", errResetTokenInvalid
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(newPassword), bcrypt.DefaultCost)
+	if err != nil {
+		return "", err
+	}
+	updated, err := tx.Exec("UPDATE server_users SET password_hash=? WHERE id=?", string(hash), userID)
+	if err != nil {
+		return "", err
+	}
+	updatedCount, err := updated.RowsAffected()
+	if err != nil {
+		return "", err
+	}
+	if updatedCount != 1 {
+		return "", errResetTokenInvalid
+	}
+	if err := tx.Commit(); err != nil {
+		return "", err
+	}
+	return userID, nil
+}

internal/server/schema.go

@@ -1,5 +1,10 @@
 package server
 
+import (
+	"database/sql"
+	"fmt"
+)
+
 const serverSchema = `
 CREATE TABLE IF NOT EXISTS server_users (
     id TEXT PRIMARY KEY,
@@ -20,6 +25,7 @@ CREATE TABLE IF NOT EXISTS server_devices (
     token_prefix TEXT,
     token_suffix TEXT,
     user_id TEXT,
+    vault_id TEXT,
     client_version TEXT,
     last_ip TEXT,
     last_seen TEXT,
@@ -36,6 +42,8 @@ CREATE TABLE IF NOT EXISTS server_user_devices (
 CREATE TABLE IF NOT EXISTS server_ops (
     op_id TEXT PRIMARY KEY,
     server_sequence INTEGER,
+    user_id TEXT NOT NULL,
+    vault_id TEXT NOT NULL,
     device_id TEXT NOT NULL,
     entity_type TEXT NOT NULL,
     entity_id TEXT NOT NULL,
@@ -49,17 +57,22 @@ CREATE TABLE IF NOT EXISTS server_ops (
 );
 
 CREATE TABLE IF NOT EXISTS server_tombstones (
+    user_id TEXT NOT NULL,
+    vault_id TEXT NOT NULL,
     entity_type TEXT NOT NULL,
     entity_id TEXT NOT NULL,
     op_id TEXT NOT NULL,
     deleted_at TEXT NOT NULL,
-    PRIMARY KEY (entity_type, entity_id)
+    PRIMARY KEY (user_id, vault_id, entity_type, entity_id)
 );
 
 CREATE TABLE IF NOT EXISTS server_idempotency_keys (
-    idempotency_key TEXT PRIMARY KEY,
+    user_id TEXT NOT NULL,
+    vault_id TEXT NOT NULL,
+    idempotency_key TEXT NOT NULL,
     response_json TEXT NOT NULL,
-    created_at TEXT NOT NULL
+    created_at TEXT NOT NULL,
+    PRIMARY KEY (user_id, vault_id, idempotency_key)
 );
 
 CREATE TABLE IF NOT EXISTS server_email_tokens (
@@ -107,3 +120,197 @@ CREATE TABLE IF NOT EXISTS server_smtp_config (
     value TEXT NOT NULL
 );
 `
+
+type sqliteColumn struct {
+	primaryKeyOrder int
+}
+
+func migrateServerSchema(db *sql.DB) error {
+	tx, err := db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+
+	for _, change := range []struct {
+		table      string
+		column     string
+		definition string
+	}{
+		{"server_devices", "user_id", "TEXT"},
+		{"server_devices", "vault_id", "TEXT"},
+		{"server_ops", "user_id", "TEXT"},
+		{"server_ops", "vault_id", "TEXT"},
+	} {
+		if err := ensureSQLiteColumn(tx, change.table, change.column, change.definition); err != nil {
+			return err
+		}
+	}
+
+	if err := backfillDeviceOwners(tx); err != nil {
+		return err
+	}
+	if err := backfillOperationScope(tx); err != nil {
+		return err
+	}
+	if err := migrateTombstoneScope(tx); err != nil {
+		return err
+	}
+	if err := migrateIdempotencyScope(tx); err != nil {
+		return err
+	}
+	if _, err := tx.Exec(`CREATE INDEX IF NOT EXISTS idx_server_ops_scope_sequence
+		ON server_ops(user_id, vault_id, server_sequence)`); err != nil {
+		return err
+	}
+	if _, err := tx.Exec(`CREATE INDEX IF NOT EXISTS idx_server_devices_scope
+		ON server_devices(user_id, vault_id)`); err != nil {
+		return err
+	}
+
+	return tx.Commit()
+}
+
+func ensureSQLiteColumn(tx *sql.Tx, table, column, definition string) error {
+	columns, err := sqliteTableColumns(tx, table)
+	if err != nil {
+		return err
+	}
+	if _, ok := columns[column]; ok {
+		return nil
+	}
+	if _, err := tx.Exec(fmt.Sprintf("ALTER TABLE %s ADD COLUMN %s %s", table, column, definition)); err != nil {
+		return fmt.Errorf("add %s.%s: %w", table, column, err)
+	}
+	return nil
+}
+
+func sqliteTableColumns(tx *sql.Tx, table string) (map[string]sqliteColumn, error) {
+	rows, err := tx.Query(fmt.Sprintf("PRAGMA table_info(%s)", table))
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	columns := make(map[string]sqliteColumn)
+	for rows.Next() {
+		var cid, notNull, primaryKeyOrder int
+		var name, dataType string
+		var defaultValue sql.NullString
+		if err := rows.Scan(&cid, &name, &dataType, &notNull, &defaultValue, &primaryKeyOrder); err != nil {
+			return nil, err
+		}
+		columns[name] = sqliteColumn{primaryKeyOrder: primaryKeyOrder}
+	}
+	return columns, rows.Err()
+}
+
+func backfillDeviceOwners(tx *sql.Tx) error {
+	_, err := tx.Exec(`UPDATE server_devices
+		SET user_id = (
+			SELECT user_id FROM server_user_devices
+			WHERE device_id = server_devices.id
+		)
+		WHERE COALESCE(user_id, '') = ''
+		  AND 1 = (
+			SELECT COUNT(*) FROM server_user_devices
+			WHERE device_id = server_devices.id
+		)`)
+	return err
+}
+
+func backfillOperationScope(tx *sql.Tx) error {
+	if _, err := tx.Exec(`UPDATE server_ops
+		SET user_id = (
+			SELECT user_id FROM server_devices
+			WHERE id = server_ops.device_id
+		)
+		WHERE COALESCE(user_id, '') = ''`); err != nil {
+		return err
+	}
+	_, err := tx.Exec(`UPDATE server_ops
+		SET vault_id = COALESCE(
+			NULLIF((SELECT vault_id FROM server_devices WHERE id = server_ops.device_id), ''),
+			'legacy:' || user_id
+		)
+		WHERE COALESCE(vault_id, '') = ''
+		  AND COALESCE(user_id, '') != ''`)
+	return err
+}
+
+func migrateTombstoneScope(tx *sql.Tx) error {
+	if hasScopedPrimaryKey(tx, "server_tombstones", "user_id", "vault_id", "entity_type", "entity_id") {
+		return nil
+	}
+	if _, err := tx.Exec("ALTER TABLE server_tombstones RENAME TO server_tombstones_legacy"); err != nil {
+		return err
+	}
+	if _, err := tx.Exec(`CREATE TABLE server_tombstones (
+		user_id TEXT NOT NULL,
+		vault_id TEXT NOT NULL,
+		entity_type TEXT NOT NULL,
+		entity_id TEXT NOT NULL,
+		op_id TEXT NOT NULL,
+		deleted_at TEXT NOT NULL,
+		PRIMARY KEY (user_id, vault_id, entity_type, entity_id)
+	)`); err != nil {
+		return err
+	}
+	if _, err := tx.Exec(`INSERT OR IGNORE INTO server_tombstones
+		(user_id, vault_id, entity_type, entity_id, op_id, deleted_at)
+		SELECT o.user_id, o.vault_id, legacy.entity_type, legacy.entity_id, legacy.op_id, legacy.deleted_at
+		FROM server_tombstones_legacy AS legacy
+		JOIN server_ops AS o ON o.op_id = legacy.op_id
+		WHERE COALESCE(o.user_id, '') != '' AND COALESCE(o.vault_id, '') != ''`); err != nil {
+		return err
+	}
+	_, err := tx.Exec("DROP TABLE server_tombstones_legacy")
+	return err
+}
+
+func migrateIdempotencyScope(tx *sql.Tx) error {
+	if hasScopedPrimaryKey(tx, "server_idempotency_keys", "user_id", "vault_id", "idempotency_key") {
+		return nil
+	}
+	if _, err := tx.Exec("ALTER TABLE server_idempotency_keys RENAME TO server_idempotency_keys_legacy"); err != nil {
+		return err
+	}
+	if _, err := tx.Exec(`CREATE TABLE server_idempotency_keys (
+		user_id TEXT NOT NULL,
+		vault_id TEXT NOT NULL,
+		idempotency_key TEXT NOT NULL,
+		response_json TEXT NOT NULL,
+		created_at TEXT NOT NULL,
+		PRIMARY KEY (user_id, vault_id, idempotency_key)
+	)`); err != nil {
+		return err
+	}
+	// The previous cache was global. Discard it rather than risk replaying a
+	// response for another user or vault after the migration.
+	_, err := tx.Exec("DROP TABLE server_idempotency_keys_legacy")
+	return err
+}
+
+func hasScopedPrimaryKey(tx *sql.Tx, table string, want ...string) bool {
+	columns, err := sqliteTableColumns(tx, table)
+	if err != nil {
+		return false
+	}
+	for index, name := range want {
+		column, ok := columns[name]
+		if !ok || column.primaryKeyOrder != index+1 {
+			return false
+		}
+	}
+	return true
+}
+
+func effectiveVaultScope(userID, vaultID string) string {
+	if vaultID != "" {
+		return vaultID
+	}
+	if userID == "" {
+		return ""
+	}
+	return "legacy:" + userID
+}

internal/server/server.go

@@ -139,6 +139,10 @@ func NewServer(dbPath, dataDir string, cfg *Config) (*Server, error) {
 			return nil, fmt.Errorf("schema: %w", err)
 		}
 	}
+	if err := migrateServerSchema(db); err != nil {
+		db.Close()
+		return nil, fmt.Errorf("migrate schema: %w", err)
+	}
 
 	blobsDir := filepath.Join(dataDir, "blobs")
 	if err := os.MkdirAll(blobsDir, 0750); err != nil {

internal/server/server_test.go

@@ -1,9 +1,20 @@
 package server
 
 import (
+	"bytes"
+	"database/sql"
+	"encoding/json"
+	"html"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
+	"time"
+
+	"golang.org/x/crypto/bcrypt"
 )
 
 func TestNewServer(t *testing.T) {
@@ -52,3 +63,627 @@ func TestConfigSetAdmin(t *testing.T) {
 		t.Fatal("CheckAdmin should return false for unknown user")
 	}
 }
+
+func TestAdminDashboardSMTPSecuritySelectUsesApplicationStyles(t *testing.T) {
+	html := adminDashboardHTML("en", 0, 0, "", "", "", "", "starttls", "")
+
+	for _, expected := range []string{
+		`<select name="smtp_security" class="form-select">`,
+		`.form-select{`,
+		`appearance:none`,
+		`background-image:linear-gradient`,
+		`.form-select option{background:#13131f;color:#e4e4ef}`,
+		`.form-select:focus{outline:none;border-color:#6366f1`,
+	} {
+		if !strings.Contains(html, expected) {
+			t.Errorf("SMTP security select is missing application styling %q", expected)
+		}
+	}
+}
+
+func TestUserFacingServerErrorsDoNotExposeInternalDetails(t *testing.T) {
+	for _, name := range []string{"handlers_auth.go", "handlers_api.go", "handlers_admin.go", "handlers_web_user.go"} {
+		source, err := os.ReadFile(name)
+		if err != nil {
+			t.Fatalf("read %s: %v", name, err)
+		}
+		for _, forbidden := range []string{
+			"jsonErr(w, 500, err.Error())",
+			"http.Error(w, err.Error(), 500)",
+			"errorPageHTML(locale, t(locale, \"common.error\"), err.Error()",
+		} {
+			if strings.Contains(string(source), forbidden) {
+				t.Errorf("%s exposes an internal error with %q", name, forbidden)
+			}
+		}
+	}
+}
+
+func TestSyncPushPullStoresSequencedOps(t *testing.T) {
+	dir := t.TempDir()
+	s, err := NewServer(filepath.Join(dir, "test.db"), filepath.Join(dir, "data"), &Config{Port: 47732})
+	if err != nil {
+		t.Fatalf("NewServer: %v", err)
+	}
+	defer s.Close()
+	s.SetupRoutes()
+
+	insertSyncUser(t, s, "user-a")
+	now := time.Now().UTC().Format(time.RFC3339)
+	if _, err := s.db.Exec(
+		"INSERT INTO server_devices (id, name, api_key, user_id, vault_id, last_seen, created_at) VALUES (?, ?, ?, ?, ?, ?, ?)",
+		"device-a", "Device A", "api-key", "user-a", "vault-a", now, now,
+	); err != nil {
+		t.Fatalf("insert device: %v", err)
+	}
+	ts := httptest.NewServer(s.mux)
+	defer ts.Close()
+
+	pushBody := map[string]interface{}{
+		"device_id": "device-a",
+		"ops": []map[string]interface{}{
+			{
+				"op_id":           "op-1",
+				"entity_type":     "file",
+				"entity_id":       "Docs/one.txt",
+				"op_type":         "create",
+				"payload_json":    `{"path":"Docs/one.txt","content":"hello"}`,
+				"created_at":      "2026-06-27T00:00:00Z",
+				"client_sequence": 1,
+			},
+		},
+	}
+	pushResp := postJSON(t, ts.URL+"/api/v1/sync/push", "api-key", pushBody)
+	if got := int(pushResp["count"].(float64)); got != 1 {
+		t.Fatalf("push count = %d, want 1: %#v", got, pushResp)
+	}
+	accepted := pushResp["accepted"].([]interface{})
+	if len(accepted) != 1 || accepted[0] != "op-1" {
+		t.Fatalf("accepted = %#v", accepted)
+	}
+
+	pullResp := postJSON(t, ts.URL+"/api/v1/sync/pull", "api-key", map[string]interface{}{
+		"since_sequence": 0,
+	})
+	if got := int(pullResp["server_sequence"].(float64)); got != 1 {
+		t.Fatalf("server_sequence = %d, want 1: %#v", got, pullResp)
+	}
+	ops := pullResp["ops"].([]interface{})
+	if len(ops) != 1 {
+		t.Fatalf("ops len = %d, want 1: %#v", len(ops), ops)
+	}
+	op := ops[0].(map[string]interface{})
+	if op["op_id"] != "op-1" ||
+		op["device_id"] != "device-a" ||
+		op["entity_type"] != "file" ||
+		op["entity_id"] != "Docs/one.txt" ||
+		op["op_type"] != "create" ||
+		op["payload_json"] != `{"path":"Docs/one.txt","content":"hello"}` ||
+		int(op["server_sequence"].(float64)) != 1 {
+		t.Fatalf("pulled op = %#v", op)
+	}
+
+	pullAfterResp := postJSON(t, ts.URL+"/api/v1/sync/pull", "api-key", map[string]interface{}{
+		"since_sequence": 1,
+	})
+	if got := int(pullAfterResp["server_sequence"].(float64)); got != 1 {
+		t.Fatalf("server_sequence after = %d, want 1", got)
+	}
+	if ops := pullAfterResp["ops"].([]interface{}); len(ops) != 0 {
+		t.Fatalf("ops after seq len = %d, want 0: %#v", len(ops), ops)
+	}
+}
+
+func TestRevokedLegacyAPIKeyCannotPushOrPull(t *testing.T) {
+	dir := t.TempDir()
+	s, err := NewServer(filepath.Join(dir, "test.db"), filepath.Join(dir, "data"), &Config{Port: 47732})
+	if err != nil {
+		t.Fatalf("NewServer: %v", err)
+	}
+	defer s.Close()
+	s.SetupRoutes()
+
+	now := time.Now().UTC().Format(time.RFC3339)
+	if _, err := s.db.Exec(
+		"INSERT INTO server_devices (id, name, api_key, last_seen, revoked_at, created_at) VALUES (?, ?, ?, ?, ?, ?)",
+		"device-revoked", "Revoked Device", "revoked-key", now, now, now,
+	); err != nil {
+		t.Fatalf("insert device: %v", err)
+	}
+	ts := httptest.NewServer(s.mux)
+	defer ts.Close()
+
+	pushStatus, pushResp := postJSONStatus(t, ts.URL+"/api/v1/sync/push", "revoked-key", map[string]interface{}{
+		"device_id": "device-revoked",
+		"ops":       []map[string]interface{}{},
+	})
+	if pushStatus != http.StatusUnauthorized || pushResp["error"] != "device revoked" {
+		t.Fatalf("push status=%d resp=%#v, want 401 device revoked", pushStatus, pushResp)
+	}
+
+	pullStatus, pullResp := postJSONStatus(t, ts.URL+"/api/v1/sync/pull", "revoked-key", map[string]interface{}{
+		"since_sequence": 0,
+	})
+	if pullStatus != http.StatusUnauthorized || pullResp["error"] != "device revoked" {
+		t.Fatalf("pull status=%d resp=%#v, want 401 device revoked", pullStatus, pullResp)
+	}
+}
+
+func TestSyncPullDoesNotExposeOtherUserOperations(t *testing.T) {
+	s, ts := newSyncHTTPServer(t)
+	defer s.Close()
+	defer ts.Close()
+
+	insertSyncUser(t, s, "user-a")
+	insertSyncUser(t, s, "user-b")
+	insertSyncDevice(t, s, "device-a", "user-a", "token-a")
+	insertSyncDevice(t, s, "device-b", "user-b", "token-b")
+
+	postJSON(t, ts.URL+"/api/v1/sync/push", "token-a", syncPushBody("device-a", "op-user-a", ""))
+
+	pull := postJSON(t, ts.URL+"/api/v1/sync/pull", "token-b", map[string]interface{}{
+		"since_sequence": 0,
+	})
+	if got := len(pull["ops"].([]interface{})); got != 0 {
+		t.Fatalf("other user pulled %d operation(s), want 0: %#v", got, pull)
+	}
+	if got := int(pull["server_sequence"].(float64)); got != 0 {
+		t.Fatalf("other user cursor = %d, want 0: %#v", got, pull)
+	}
+}
+
+func TestSyncPushUsesAuthenticatedDeviceIdentity(t *testing.T) {
+	s, ts := newSyncHTTPServer(t)
+	defer s.Close()
+	defer ts.Close()
+
+	insertSyncUser(t, s, "user-a")
+	insertSyncUser(t, s, "user-b")
+	insertSyncDevice(t, s, "device-authenticated", "user-a", "token-a")
+	insertSyncDevice(t, s, "device-forged", "user-b", "token-b")
+
+	postJSON(t, ts.URL+"/api/v1/sync/push", "token-a", syncPushBody("device-forged", "op-auth-device", ""))
+
+	var storedDeviceID string
+	if err := s.db.QueryRow("SELECT device_id FROM server_ops WHERE op_id=?", "op-auth-device").Scan(&storedDeviceID); err != nil {
+		t.Fatalf("read stored operation: %v", err)
+	}
+	if storedDeviceID != "device-authenticated" {
+		t.Fatalf("stored device = %q, want authenticated device", storedDeviceID)
+	}
+}
+
+func TestSyncPushScopesIdempotencyResponsesByUser(t *testing.T) {
+	s, ts := newSyncHTTPServer(t)
+	defer s.Close()
+	defer ts.Close()
+
+	insertSyncUser(t, s, "user-a")
+	insertSyncUser(t, s, "user-b")
+	insertSyncDevice(t, s, "device-a", "user-a", "token-a")
+	insertSyncDevice(t, s, "device-b", "user-b", "token-b")
+
+	postJSON(t, ts.URL+"/api/v1/sync/push", "token-a", syncPushBody("device-a", "op-user-a", "same-key"))
+	response := postJSON(t, ts.URL+"/api/v1/sync/push", "token-b", syncPushBody("device-b", "op-user-b", "same-key"))
+
+	accepted := response["accepted"].([]interface{})
+	if len(accepted) != 1 || accepted[0] != "op-user-b" {
+		t.Fatalf("user-b received idempotency response %#v, want only op-user-b", response)
+	}
+}
+
+func TestSyncPushDoesNotReportOtherTenantConflicts(t *testing.T) {
+	s, ts := newSyncHTTPServer(t)
+	defer s.Close()
+	defer ts.Close()
+
+	insertSyncUser(t, s, "user-a")
+	insertSyncUser(t, s, "user-b")
+	insertSyncDevice(t, s, "device-a", "user-a", "token-a")
+	insertSyncDevice(t, s, "device-b", "user-b", "token-b")
+
+	postJSON(t, ts.URL+"/api/v1/sync/push", "token-a", syncPushBody("device-a", "op-user-a-1", ""))
+	postJSON(t, ts.URL+"/api/v1/sync/push", "token-a", syncPushBody("device-a", "op-user-a-2", ""))
+
+	body := syncPushBody("device-b", "op-user-b", "")
+	body["ops"].([]map[string]interface{})[0]["last_seen_server_seq"] = 1
+	response := postJSON(t, ts.URL+"/api/v1/sync/push", "token-b", body)
+	if response["conflicts"] != nil {
+		t.Fatalf("other tenant conflict leaked into response: %#v", response)
+	}
+}
+
+func TestSyncPullDoesNotExposeOtherVaultOperations(t *testing.T) {
+	s, ts := newSyncHTTPServer(t)
+	defer s.Close()
+	defer ts.Close()
+
+	password := "correct horse battery staple"
+	insertPairableUser(t, s, "user-a", "alice", password)
+
+	deviceA := pairSyncDevice(t, ts.URL, "alice", password, "vault-a")
+	deviceB := pairSyncDevice(t, ts.URL, "alice", password, "vault-b")
+
+	postJSON(t, ts.URL+"/api/v1/sync/push", deviceA.token, syncPushBody(deviceA.id, "op-vault-a", ""))
+	postJSON(t, ts.URL+"/api/v1/sync/push", deviceB.token, syncPushBody(deviceB.id, "op-vault-b", ""))
+
+	pull := postJSON(t, ts.URL+"/api/v1/sync/pull", deviceA.token, map[string]interface{}{
+		"since_sequence": 0,
+	})
+	ops := pull["ops"].([]interface{})
+	if len(ops) != 1 || ops[0].(map[string]interface{})["op_id"] != "op-vault-a" {
+		t.Fatalf("vault-a pulled %#v, want only op-vault-a", pull)
+	}
+}
+
+func TestClientPairRequiresVaultID(t *testing.T) {
+	s, ts := newSyncHTTPServer(t)
+	defer s.Close()
+	defer ts.Close()
+
+	password := "correct horse battery staple"
+	insertPairableUser(t, s, "user-a", "alice", password)
+
+	status, response := postJSONStatus(t, ts.URL+"/api/client/pair", "", map[string]interface{}{
+		"login":       "alice",
+		"password":    password,
+		"device_name": "Desktop",
+	})
+	if status != http.StatusBadRequest || response["error"] != "vault_id required" {
+		t.Fatalf("pair without vault ID status=%d response=%#v, want 400 vault_id required", status, response)
+	}
+}
+
+func TestClientPairRejectsReservedLegacyVaultID(t *testing.T) {
+	s, ts := newSyncHTTPServer(t)
+	defer s.Close()
+	defer ts.Close()
+
+	password := "correct horse battery staple"
+	insertPairableUser(t, s, "user-a", "alice", password)
+
+	status, response := postJSONStatus(t, ts.URL+"/api/client/pair", "", map[string]interface{}{
+		"login":       "alice",
+		"password":    password,
+		"device_name": "Desktop",
+		"vault_id":    "legacy:user-a",
+	})
+	if status != http.StatusBadRequest || response["error"] != "vault_id uses reserved prefix" {
+		t.Fatalf("pair with reserved vault ID status=%d response=%#v, want 400 reserved prefix", status, response)
+	}
+}
+
+func TestDeviceRegisterRequiresValidVaultID(t *testing.T) {
+	s, ts := newSyncHTTPServer(t)
+	defer s.Close()
+	defer ts.Close()
+
+	password := "correct horse battery staple"
+	insertPairableUser(t, s, "user-a", "alice", password)
+
+	status, response := postJSONStatus(t, ts.URL+"/api/v1/device/register", "", map[string]interface{}{
+		"name":     "Desktop",
+		"username": "alice",
+		"password": password,
+	})
+	if status != http.StatusBadRequest || response["error"] != "vault_id required" {
+		t.Fatalf("register without vault ID status=%d response=%#v, want 400 vault_id required", status, response)
+	}
+
+	status, response = postJSONStatus(t, ts.URL+"/api/v1/device/register", "", map[string]interface{}{
+		"name":     "Desktop",
+		"username": "alice",
+		"password": password,
+		"vault_id": "legacy:user-a",
+	})
+	if status != http.StatusBadRequest || response["error"] != "vault_id uses reserved prefix" {
+		t.Fatalf("register with reserved vault ID status=%d response=%#v, want 400 reserved prefix", status, response)
+	}
+}
+
+func TestWebResetRejectsExpiredToken(t *testing.T) {
+	s, _ := newSyncHTTPServer(t)
+	defer s.Close()
+
+	oldPassword := "correct horse battery staple"
+	insertPairableUser(t, s, "user-a", "alice", oldPassword)
+	now := time.Now().UTC().Format(time.RFC3339)
+	if _, err := s.db.Exec(`INSERT INTO server_email_tokens
+		(token, user_id, purpose, expires_at, created_at)
+		VALUES (?, ?, 'reset', ?, ?)`, "expired-reset-token", "user-a", time.Now().Add(-time.Hour).UTC().Format(time.RFC3339), now); err != nil {
+		t.Fatalf("insert reset token: %v", err)
+	}
+
+	response := postWebReset(t, s, "expired-reset-token", "new secret password")
+	if response.Code != http.StatusFound || response.Header().Get("Location") != "/forgot" {
+		t.Fatalf("expired reset response status=%d location=%q, want 302 /forgot", response.Code, response.Header().Get("Location"))
+	}
+
+	var passwordHash string
+	if err := s.db.QueryRow("SELECT password_hash FROM server_users WHERE id=?", "user-a").Scan(&passwordHash); err != nil {
+		t.Fatalf("read password hash: %v", err)
+	}
+	if bcrypt.CompareHashAndPassword([]byte(passwordHash), []byte(oldPassword)) != nil {
+		t.Fatal("expired reset changed the password")
+	}
+}
+
+func TestServerRenderedPagesEscapeStoredValues(t *testing.T) {
+	s, _ := newSyncHTTPServer(t)
+	defer s.Close()
+
+	const maliciousText = `<img src=x onerror=alert(1)>`
+	const maliciousDeviceID = `device');alert(1);//`
+	now := time.Now().UTC().Format(time.RFC3339)
+	if _, err := s.db.Exec(`INSERT INTO server_users
+		(id, username, email, password_hash, confirmed, created_at)
+		VALUES (?, ?, ?, ?, 1, ?)`, "user-a", maliciousText, maliciousText+"@example.test", "unused", now); err != nil {
+		t.Fatalf("insert user: %v", err)
+	}
+	if _, err := s.db.Exec(`INSERT INTO server_devices
+		(id, name, api_key, user_id, vault_id, client_version, last_seen, created_at)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?)`, maliciousDeviceID, maliciousText, "device-key", "user-a", "vault-a", maliciousText, now, now); err != nil {
+		t.Fatalf("insert device: %v", err)
+	}
+	if _, err := s.db.Exec("INSERT INTO server_user_devices (user_id, device_id) VALUES (?, ?)", "user-a", maliciousDeviceID); err != nil {
+		t.Fatalf("link user device: %v", err)
+	}
+
+	tests := []struct {
+		name          string
+		path          string
+		cookie        *http.Cookie
+		containsDevID bool
+	}{
+		{
+			name:          "user dashboard",
+			path:          "/dashboard",
+			cookie:        &http.Cookie{Name: "user_session", Value: s.userTokens.Create("user-a")},
+			containsDevID: true,
+		},
+		{
+			name:   "admin users",
+			path:   "/admin/users",
+			cookie: &http.Cookie{Name: "admin_session", Value: s.tokens.Create()},
+		},
+		{
+			name:          "admin devices",
+			path:          "/admin/devices",
+			cookie:        &http.Cookie{Name: "admin_session", Value: s.tokens.Create()},
+			containsDevID: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodGet, tt.path, nil)
+			req.AddCookie(tt.cookie)
+			res := httptest.NewRecorder()
+			s.mux.ServeHTTP(res, req)
+			if res.Code != http.StatusOK {
+				t.Fatalf("status = %d, want 200", res.Code)
+			}
+			body := res.Body.String()
+			if strings.Contains(body, maliciousText) {
+				t.Fatalf("page contains unescaped stored text: %s", body)
+			}
+			if !strings.Contains(body, html.EscapeString(maliciousText)) {
+				t.Fatalf("page does not contain escaped stored text: %s", body)
+			}
+			if tt.containsDevID && strings.Contains(body, maliciousDeviceID) {
+				t.Fatalf("page contains unescaped device ID: %s", body)
+			}
+		})
+	}
+}
+
+func TestNewServerMigratesLegacyOperationScope(t *testing.T) {
+	dir := t.TempDir()
+	dbPath := filepath.Join(dir, "legacy.db")
+	db, err := sql.Open("sqlite3", dbPath)
+	if err != nil {
+		t.Fatalf("open legacy db: %v", err)
+	}
+
+	legacySchema := []string{
+		`CREATE TABLE server_devices (
+			id TEXT PRIMARY KEY, name TEXT NOT NULL, api_key TEXT NOT NULL UNIQUE,
+			token_hash TEXT, token_prefix TEXT, token_suffix TEXT, user_id TEXT,
+			client_version TEXT, last_ip TEXT, last_seen TEXT, revoked_at TEXT,
+			created_at TEXT NOT NULL
+		)`,
+		`CREATE TABLE server_user_devices (
+			user_id TEXT NOT NULL, device_id TEXT NOT NULL,
+			PRIMARY KEY (user_id, device_id)
+		)`,
+		`CREATE TABLE server_ops (
+			op_id TEXT PRIMARY KEY, server_sequence INTEGER, device_id TEXT NOT NULL,
+			entity_type TEXT NOT NULL, entity_id TEXT NOT NULL, op_type TEXT NOT NULL,
+			payload_json TEXT NOT NULL, idempotency_key TEXT, client_sequence INTEGER DEFAULT 0,
+			last_seen_server_seq INTEGER DEFAULT 0, created_at TEXT NOT NULL,
+			pushed_at TEXT NOT NULL
+		)`,
+		`CREATE TABLE server_tombstones (
+			entity_type TEXT NOT NULL, entity_id TEXT NOT NULL, op_id TEXT NOT NULL,
+			deleted_at TEXT NOT NULL, PRIMARY KEY (entity_type, entity_id)
+		)`,
+		`CREATE TABLE server_idempotency_keys (
+			idempotency_key TEXT PRIMARY KEY, response_json TEXT NOT NULL, created_at TEXT NOT NULL
+		)`,
+	}
+	for _, stmt := range legacySchema {
+		if _, err := db.Exec(stmt); err != nil {
+			t.Fatalf("create legacy schema: %v", err)
+		}
+	}
+	now := time.Now().UTC().Format(time.RFC3339)
+	if _, err := db.Exec(`INSERT INTO server_devices (id, name, api_key, last_seen, created_at)
+		VALUES (?, ?, ?, ?, ?)`, "legacy-device", "Legacy", "legacy-key", now, now); err != nil {
+		t.Fatalf("insert legacy device: %v", err)
+	}
+	if _, err := db.Exec(`INSERT INTO server_user_devices (user_id, device_id) VALUES (?, ?)`, "legacy-user", "legacy-device"); err != nil {
+		t.Fatalf("insert legacy device owner: %v", err)
+	}
+	if _, err := db.Exec(`INSERT INTO server_ops
+		(op_id, server_sequence, device_id, entity_type, entity_id, op_type, payload_json, created_at, pushed_at)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`, "legacy-op", 1, "legacy-device", "file", "Docs/one.txt", "create", `{}`, now, now); err != nil {
+		t.Fatalf("insert legacy operation: %v", err)
+	}
+	if err := db.Close(); err != nil {
+		t.Fatalf("close legacy db: %v", err)
+	}
+
+	s, err := NewServer(dbPath, filepath.Join(dir, "data"), &Config{Port: 47732})
+	if err != nil {
+		t.Fatalf("NewServer migration: %v", err)
+	}
+	assertLegacyOperationScope(t, s)
+	if err := s.Close(); err != nil {
+		t.Fatalf("close migrated db: %v", err)
+	}
+
+	s, err = NewServer(dbPath, filepath.Join(dir, "data"), &Config{Port: 47732})
+	if err != nil {
+		t.Fatalf("NewServer repeated migration: %v", err)
+	}
+	defer s.Close()
+	assertLegacyOperationScope(t, s)
+}
+
+func assertLegacyOperationScope(t *testing.T, s *Server) {
+	t.Helper()
+	var userID, vaultID string
+	if err := s.db.QueryRow("SELECT user_id, vault_id FROM server_ops WHERE op_id=?", "legacy-op").Scan(&userID, &vaultID); err != nil {
+		t.Fatalf("read migrated operation: %v", err)
+	}
+	if userID != "legacy-user" || vaultID != "legacy:legacy-user" {
+		t.Fatalf("migrated scope = %q/%q, want legacy-user/legacy:legacy-user", userID, vaultID)
+	}
+}
+
+func newSyncHTTPServer(t *testing.T) (*Server, *httptest.Server) {
+	t.Helper()
+	dir := t.TempDir()
+	s, err := NewServer(filepath.Join(dir, "test.db"), filepath.Join(dir, "data"), &Config{Port: 47732})
+	if err != nil {
+		t.Fatalf("NewServer: %v", err)
+	}
+	s.SetupRoutes()
+	return s, httptest.NewServer(s.mux)
+}
+
+func insertSyncUser(t *testing.T, s *Server, userID string) {
+	t.Helper()
+	now := time.Now().UTC().Format(time.RFC3339)
+	if _, err := s.db.Exec(`INSERT INTO server_users
+		(id, username, email, password_hash, confirmed, created_at)
+		VALUES (?, ?, ?, ?, 1, ?)`, userID, userID, userID+"@example.test", "unused", now); err != nil {
+		t.Fatalf("insert sync user %s: %v", userID, err)
+	}
+}
+
+func insertPairableUser(t *testing.T, s *Server, userID, username, password string) {
+	t.Helper()
+	passwordHash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.MinCost)
+	if err != nil {
+		t.Fatalf("hash password: %v", err)
+	}
+	now := time.Now().UTC().Format(time.RFC3339)
+	if _, err := s.db.Exec(`INSERT INTO server_users
+		(id, username, email, password_hash, confirmed, created_at)
+		VALUES (?, ?, ?, ?, 1, ?)`, userID, username, username+"@example.test", string(passwordHash), now); err != nil {
+		t.Fatalf("insert pairable user: %v", err)
+	}
+}
+
+func insertSyncDevice(t *testing.T, s *Server, deviceID, userID, token string) {
+	t.Helper()
+	now := time.Now().UTC().Format(time.RFC3339)
+	if _, err := s.db.Exec(`INSERT INTO server_devices
+		(id, name, api_key, token_hash, user_id, last_seen, created_at)
+		VALUES (?, ?, ?, ?, ?, ?, ?)`, deviceID, deviceID, "legacy-"+deviceID, sha256Hex(token), userID, now, now); err != nil {
+		t.Fatalf("insert sync device %s: %v", deviceID, err)
+	}
+}
+
+func syncPushBody(deviceID, opID, idempotencyKey string) map[string]interface{} {
+	return map[string]interface{}{
+		"device_id":       deviceID,
+		"idempotency_key": idempotencyKey,
+		"ops": []map[string]interface{}{
+			{
+				"op_id":        opID,
+				"entity_type":  "file",
+				"entity_id":    "Docs/one.txt",
+				"op_type":      "create",
+				"payload_json": `{"path":"Docs/one.txt","content":"hello"}`,
+				"created_at":   "2026-07-10T00:00:00Z",
+			},
+		},
+	}
+}
+
+type pairedSyncDevice struct {
+	id    string
+	token string
+}
+
+func pairSyncDevice(t *testing.T, serverURL, username, password, vaultID string) pairedSyncDevice {
+	t.Helper()
+	response := postJSON(t, serverURL+"/api/client/pair", "", map[string]interface{}{
+		"login":       username,
+		"password":    password,
+		"device_name": "Desktop " + vaultID,
+		"vault_id":    vaultID,
+	})
+	return pairedSyncDevice{
+		id:    response["device_id"].(string),
+		token: response["device_token"].(string),
+	}
+}
+
+func postWebReset(t *testing.T, s *Server, token, password string) *httptest.ResponseRecorder {
+	t.Helper()
+	form := url.Values{
+		"token":    {token},
+		"password": {password},
+		"confirm":  {password},
+	}
+	request := httptest.NewRequest(http.MethodPost, "/reset", strings.NewReader(form.Encode()))
+	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	response := httptest.NewRecorder()
+	s.mux.ServeHTTP(response, request)
+	return response
+}
+
+func postJSON(t *testing.T, url, token string, body interface{}) map[string]interface{} {
+	t.Helper()
+	status, out := postJSONStatus(t, url, token, body)
+	if status != http.StatusOK {
+		t.Fatalf("post %s status = %d", url, status)
+	}
+	return out
+}
+
+func postJSONStatus(t *testing.T, url, token string, body interface{}) (int, map[string]interface{}) {
+	t.Helper()
+	var b bytes.Buffer
+	if err := json.NewEncoder(&b).Encode(body); err != nil {
+		t.Fatalf("encode request: %v", err)
+	}
+	req, err := http.NewRequest(http.MethodPost, url, &b)
+	if err != nil {
+		t.Fatalf("new request: %v", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", "Bearer "+token)
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		t.Fatalf("post %s: %v", url, err)
+	}
+	defer resp.Body.Close()
+	var out map[string]interface{}
+	if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+	return resp.StatusCode, out
+}

internal/server/templates.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"fmt"
+	"html"
 	"strings"
 )
 
@@ -311,6 +312,9 @@ input:focus{outline:none;border-color:#6366f1}
 .form-row{display:flex;gap:8px;margin-bottom:8px;align-items:center}
 .form-row label{font-size:12px;color:#888;min-width:80px;flex-shrink:0}
 .form-row input{flex:1}
+.form-select{font-family:inherit;font-size:14px;padding:8px 32px 8px 12px;border:1px solid #2a2a3c;background-color:#13131f;color:#e4e4ef;border-radius:6px;flex:1;box-sizing:border-box;appearance:none;background-image:linear-gradient(45deg,transparent 50%%,#8b93aa 50%%),linear-gradient(135deg,#8b93aa 50%%,transparent 50%%);background-position:calc(100%% - 16px) 50%%,calc(100%% - 11px) 50%%;background-size:5px 5px,5px 5px;background-repeat:no-repeat}
+.form-select option{background:#13131f;color:#e4e4ef}
+.form-select:focus{outline:none;border-color:#6366f1;box-shadow:0 0 0 2px rgba(99,102,241,.24)}
 .toolbar{display:flex;gap:8px;margin:16px 0;flex-wrap:wrap}
 .modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.6);display:flex;align-items:center;justify-content:center;z-index:100}
 .modal{background:#1a1a28;border:1px solid #2a2a3c;border-radius:12px;padding:24px;width:420px;max-width:90vw;position:relative;max-height:80vh;overflow-y:auto}
@@ -379,7 +383,7 @@ function testSMTP(){
 <form action="/admin/api/smtp" method="POST">
 <div class="form-row"><label>%[18]s</label><input name="smtp_host" value="%[32]s" placeholder="smtp.example.com"></div>
 <div class="form-row"><label>%[19]s</label><input name="smtp_port" value="%[33]s" placeholder="587"></div>
-<div class="form-row"><label>%[20]s</label><select name="smtp_security" style="font-family:inherit;font-size:14px;padding:8px 12px;border:1px solid #2a2a3c;background:#13131f;color:#e4e4ef;border-radius:6px;flex:1;box-sizing:border-box">
+<div class="form-row"><label>%[20]s</label><select name="smtp_security" class="form-select">
 <option value="starttls"%[34]s>STARTTLS</option>
 <option value="tls"%[35]s>TLS</option>
 <option value="none"%[36]s>%[21]s</option>
@@ -552,6 +556,9 @@ button:hover{background:#4f46e5}
 }
 
 func errorPageHTML(locale, title, msg, backURL string) string {
+	title = html.EscapeString(title)
+	msg = html.EscapeString(msg)
+	backURL = html.EscapeString(backURL)
 	return fmt.Sprintf(`<!DOCTYPE html>
 <html lang="ru">
 <head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">

scripts/publish-github-release.sh

@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+VERSION="${1:-}"
+REPOSITORY="mirivlad/verstak-sync-server"
+RELEASE_SCRIPT="${VERSTAK_RELEASE_SCRIPT:-$ROOT/scripts/release.sh}"
+RELEASE_DIR="${VERSTAK_RELEASE_DIR:-$ROOT/release}"
+GIT_BIN="${GIT_BIN:-git}"
+GH_BIN="${GH_BIN:-gh}"
+
+cd "$ROOT"
+
+if [[ -z "$VERSION" || ! "$VERSION" =~ ^[A-Za-z0-9][A-Za-z0-9._-]*$ ]]; then
+  echo "usage: $0 <version>" >&2
+  echo "example: $0 v0.1.0-alpha.1" >&2
+  exit 2
+fi
+if ! command -v "$GH_BIN" >/dev/null; then
+  echo "gh CLI is required to publish a GitHub Release" >&2
+  exit 1
+fi
+if [[ "$("$GIT_BIN" branch --show-current)" != "main" ]]; then
+  echo "GitHub releases must be published from main" >&2
+  exit 1
+fi
+if [[ -n "$("$GIT_BIN" status --porcelain)" ]]; then
+  echo "working tree must be clean before publishing a release" >&2
+  exit 1
+fi
+
+"$GH_BIN" auth status
+"$GIT_BIN" fetch origin main --tags
+HEAD="$("$GIT_BIN" rev-parse HEAD)"
+if [[ "$HEAD" != "$("$GIT_BIN" rev-parse origin/main)" ]]; then
+  echo "local main must match origin/main before publishing a release" >&2
+  exit 1
+fi
+
+"$RELEASE_SCRIPT" "$VERSION"
+
+ARCHIVE="$RELEASE_DIR/verstak-sync-server-linux-amd64-$VERSION.tar.gz"
+if [[ ! -f "$ARCHIVE" ]]; then
+  echo "release archive not found: $ARCHIVE" >&2
+  exit 1
+fi
+ASSETS=("$ARCHIVE")
+if [[ -f "$RELEASE_DIR/SHA256SUMS" ]]; then
+  ASSETS+=("$RELEASE_DIR/SHA256SUMS")
+fi
+
+if "$GIT_BIN" rev-parse -q --verify "refs/tags/$VERSION" >/dev/null; then
+  if [[ "$("$GIT_BIN" rev-parse "${VERSION}^{commit}")" != "$HEAD" ]]; then
+    echo "existing tag $VERSION does not point at HEAD" >&2
+    exit 1
+  fi
+else
+  "$GIT_BIN" tag -a "$VERSION" -m "Release $VERSION"
+  "$GIT_BIN" push origin "refs/tags/$VERSION"
+fi
+
+if "$GH_BIN" release view "$VERSION" --repo "$REPOSITORY" >/dev/null 2>&1; then
+  "$GH_BIN" release upload "$VERSION" "${ASSETS[@]}" --repo "$REPOSITORY" --clobber
+else
+  RELEASE_OPTIONS=(--generate-notes --verify-tag)
+  if [[ "$VERSION" == *-* ]]; then
+    RELEASE_OPTIONS+=(--prerelease)
+  else
+    RELEASE_OPTIONS+=(--latest)
+  fi
+  "$GH_BIN" release create "$VERSION" "${ASSETS[@]}" \
+    --repo "$REPOSITORY" \
+    --title "Verstak Sync Server $VERSION" \
+    "${RELEASE_OPTIONS[@]}"
+fi
+
+echo "GitHub release:"
+"$GH_BIN" release view "$VERSION" --repo "$REPOSITORY" --json url --jq .url

scripts/release.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+VERSION="${1:-}"
+
+if [[ -z "$VERSION" || ! "$VERSION" =~ ^[A-Za-z0-9][A-Za-z0-9._-]*$ ]]; then
+  echo "usage: $0 <version>" >&2
+  echo "example: $0 v0.1.0-alpha.1" >&2
+  exit 2
+fi
+if [[ "$(go env GOOS)" != "linux" || "$(go env GOARCH)" != "amd64" ]]; then
+  echo "sync-server release artifacts are currently built for linux/amd64" >&2
+  exit 1
+fi
+
+echo "=== verstak sync server release $VERSION ==="
+"$ROOT/scripts/build.sh"
+
+RELEASE_ROOT="$ROOT/release"
+STAGING="$RELEASE_ROOT/verstak-sync-server-$VERSION-linux-amd64"
+ARCHIVE="$RELEASE_ROOT/verstak-sync-server-linux-amd64-$VERSION.tar.gz"
+rm -rf "$STAGING" "$ARCHIVE"
+mkdir -p "$STAGING/scripts"
+
+cp "$ROOT/build/bin/verstak-sync-server" "$STAGING/verstak-sync-server"
+cp "$ROOT/README.md" "$ROOT/LICENSE" "$ROOT/verstak-server.service" "$STAGING/"
+cp "$ROOT/scripts/install.sh" "$STAGING/scripts/install.sh"
+tar -C "$RELEASE_ROOT" -czf "$ARCHIVE" "$(basename "$STAGING")"
+(cd "$RELEASE_ROOT" && sha256sum "$(basename "$ARCHIVE")" > SHA256SUMS)
+
+echo "release archive: $ARCHIVE"
+echo "checksums:       $RELEASE_ROOT/SHA256SUMS"

scripts/test-publish-github-release.sh

@@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+PUBLISHER="$ROOT/scripts/publish-github-release.sh"
+VERSION="v0.0.0-test"
+REPOSITORY="mirivlad/verstak-sync-server"
+ASSET_NAME="verstak-sync-server-linux-amd64-${VERSION}.tar.gz"
+STALE_ASSET="verstak-sync-server-linux-amd64-v0.0.0-stale.tar.gz"
+WORK="$(mktemp -d)"
+trap 'rm -rf "$WORK"' EXIT
+
+if [[ ! -x "$PUBLISHER" ]]; then
+  echo "publisher is missing or not executable: $PUBLISHER" >&2
+  exit 1
+fi
+
+mkdir -p "$WORK/bin" "$WORK/release" "$WORK/state"
+LOG="$WORK/log"
+export LOG
+
+cat > "$WORK/release.sh" <<'SCRIPT'
+#!/usr/bin/env bash
+set -euo pipefail
+printf 'release:%s\n' "$1" >> "$LOG"
+printf 'archive\n' > "$VERSTAK_RELEASE_DIR/verstak-sync-server-linux-amd64-$1.tar.gz"
+printf 'checksum\n' > "$VERSTAK_RELEASE_DIR/SHA256SUMS"
+SCRIPT
+chmod +x "$WORK/release.sh"
+
+printf 'stale archive\n' > "$WORK/release/$STALE_ASSET"
+
+cat > "$WORK/bin/git" <<'SCRIPT'
+#!/usr/bin/env bash
+set -euo pipefail
+if [[ "$PWD" != "${EXPECTED_ROOT:?}" ]]; then
+  echo "publisher did not enter repository root: $PWD" >&2
+  exit 1
+fi
+case "${1:-}" in
+  status) exit 0 ;;
+  branch) echo main ;;
+  fetch) printf 'fetch\n' >> "$LOG" ;;
+  rev-parse)
+    if [[ "${2:-}" == "-q" ]]; then
+      if [[ -f "$TEST_STATE/tag" ]]; then echo test-commit; exit 0; fi
+      exit 1
+    fi
+    echo test-commit
+    ;;
+  tag) touch "$TEST_STATE/tag"; printf 'tag:%s\n' "${3:-}" >> "$LOG" ;;
+  push) printf 'push:%s:%s\n' "${2:-}" "${3:-}" >> "$LOG" ;;
+  *) echo "unexpected git invocation: $*" >&2; exit 1 ;;
+esac
+SCRIPT
+chmod +x "$WORK/bin/git"
+
+cat > "$WORK/bin/gh" <<'SCRIPT'
+#!/usr/bin/env bash
+set -euo pipefail
+case "${1:-}:${2:-}" in
+  auth:status) printf 'auth\n' >> "$LOG" ;;
+  release:view)
+    if [[ -f "$TEST_STATE/release" ]]; then echo https://github.example/release; else exit 1; fi
+    ;;
+  release:create) touch "$TEST_STATE/release"; printf 'create:%s\n' "$*" >> "$LOG" ;;
+  release:upload) printf 'upload:%s\n' "$*" >> "$LOG" ;;
+  *) echo "unexpected gh invocation: $*" >&2; exit 1 ;;
+esac
+SCRIPT
+chmod +x "$WORK/bin/gh"
+
+run_publisher() {
+  VERSTAK_RELEASE_SCRIPT="$WORK/release.sh" \
+  VERSTAK_RELEASE_DIR="$WORK/release" \
+  GIT_BIN="$WORK/bin/git" \
+  GH_BIN="$WORK/bin/gh" \
+  EXPECTED_ROOT="$ROOT" \
+  TEST_STATE="$WORK/state" \
+  "$PUBLISHER" "$VERSION"
+}
+
+run_publisher
+grep -Fqx "release:$VERSION" "$LOG"
+grep -Fqx "tag:$VERSION" "$LOG"
+grep -Fqx "push:origin:refs/tags/$VERSION" "$LOG"
+grep -F "release create $VERSION" "$LOG" >/dev/null
+grep -F "$ASSET_NAME" "$LOG" >/dev/null
+grep -F "SHA256SUMS" "$LOG" >/dev/null
+grep -F -- "--prerelease" "$LOG" >/dev/null
+if grep -F -- "--latest" "$LOG" >/dev/null; then
+  echo "alpha release was incorrectly marked latest" >&2
+  exit 1
+fi
+if grep -F "$STALE_ASSET" "$LOG" >/dev/null; then
+  echo "publisher uploaded an archive from a different release version" >&2
+  exit 1
+fi
+
+run_publisher
+grep -F "release upload $VERSION" "$LOG" >/dev/null
+
+echo "GitHub release publisher test passed"

verstak-server.service

@@ -7,7 +7,9 @@ Type=simple
 User=verstak
 Group=verstak
 WorkingDirectory=/opt/verstak-sync-server
-ExecStart=/opt/verstak-sync-server/verstak-sync-server --port ${VERSTAK_PORT:-47732} --data /var/lib/verstak-sync-server
+Environment=VERSTAK_PORT=47732
+EnvironmentFile=-/etc/verstak-server/env
+ExecStart=/opt/verstak-sync-server/verstak-sync-server --port ${VERSTAK_PORT} --data /var/lib/verstak-sync-server
 Restart=on-failure
 RestartSec=5
 AmbientCapabilities=CAP_NET_BIND_SERVICE