Bootstrap copied BFF and local accounts with public Sendico contracts (#34)

backend/edge/shared/internal/transport/http/router/public/login.go

@@ -0,0 +1,249 @@
+package public
+
+import (
+	"context"
+	"crypto/subtle"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strings"
+
+	clientauth "git.sendico.io/tech/sxchnge/bff/edge/shared/auth/client"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/http/ipguard"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/srequest"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/sresponse"
+	"git.sendico.io/tech/sxchnge/bff/pkg/api/http/response"
+	"git.sendico.io/tech/sxchnge/bff/pkg/merrors"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mlogger"
+	"git.sendico.io/tech/sxchnge/bff/pkg/model"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mservice"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mutil/mask"
+	"go.uber.org/zap"
+)
+
+const pendingLoginTTLMinutes = 10
+const apiLoginGrantType = "password"
+const apiLoginClientAuthMethod = "client_secret_post"
+
+const dummyPasswordHash = "$2y$10$pmvNFN5zyooml6Oqh.cGFenBF/indHDE.dyLwjNJW1.Tk2Suvdvve"
+
+func (pr *PublicRouter) authenticateAccount(ctx context.Context, req *srequest.Login) (*model.Account, bool, http.HandlerFunc) {
+	// Get the account database entry
+	trimmedLogin := strings.TrimSpace(req.Login)
+	account, err := pr.db.GetByEmail(ctx, strings.ToLower(trimmedLogin))
+	if errors.Is(err, merrors.ErrNoData) || (err == nil && account == nil) {
+		(&model.Account{Password: dummyPasswordHash}).MatchPassword(req.Password)
+		pr.logger.Debug("Login rejected: invalid credentials")
+		return nil, true, response.Unauthorized(pr.logger, pr.service, "invalid credentials")
+	}
+	if err != nil {
+		pr.logger.Warn("Failed to query user during login", zap.Error(err))
+		return nil, false, response.Internal(pr.logger, pr.service, err)
+	}
+
+	if !account.MatchPassword(req.Password) {
+		pr.logger.Debug("Login rejected: invalid credentials")
+		return nil, true, response.Unauthorized(pr.logger, pr.service, "invalid credentials")
+	}
+
+	if !account.IsActive() {
+		return nil, false, response.Forbidden(pr.logger, pr.service, "account_not_verified", "Account verification required")
+	}
+
+	return account, false, nil
+}
+
+func (pr *PublicRouter) respondPendingLogin(account *model.Account) http.HandlerFunc {
+	pendingToken, err := pr.imp.CreatePendingToken(account, pendingLoginTTLMinutes)
+	if err != nil {
+		pr.logger.Warn("Failed to generate pending token", zap.Error(err))
+		return response.Internal(pr.logger, pr.service, err)
+	}
+
+	return sresponse.LoginPending(pr.logger, account, &pendingToken, mask.Email(account.Login))
+}
+
+func hasGrantType(grants []string, target string) bool {
+	for _, grant := range grants {
+		if strings.EqualFold(strings.TrimSpace(grant), target) {
+			return true
+		}
+	}
+	return false
+}
+
+func (pr *PublicRouter) validateClientIPPolicy(r *http.Request, clientID string, client *model.Client) http.HandlerFunc {
+	if client == nil {
+		pr.logger.Debug("Client not found, rejecting authorization", zap.String("client_id", clientID))
+		return response.Unauthorized(pr.logger, pr.service, clientauth.ErrUnknownClientID.Error())
+	}
+	clientIP := ipguard.ClientIP(r)
+	allowed, err := ipguard.Allowed(clientIP, client.AllowedCIDRs)
+	if err != nil {
+		pr.logger.Warn("Client IP policy contains invalid CIDR", zap.Error(err), zap.String("client_id", clientID))
+		return response.Forbidden(pr.logger, pr.service, "client_ip_policy_invalid", "client ip policy is invalid")
+	}
+	if !allowed {
+		rawIP := ""
+		if clientIP != nil {
+			rawIP = clientIP.String()
+		}
+		pr.logger.Info("Client IP policy denied request", zap.String("client_id", clientID), zap.String("remote_ip", rawIP))
+		return response.Forbidden(pr.logger, pr.service, "ip_not_allowed", "request ip is not allowed for this client")
+	}
+	return nil
+}
+
+func (pr *PublicRouter) loadClient(ctx context.Context, clientID string) (*model.Client, http.HandlerFunc) {
+	client, err := clientauth.Resolve(ctx, pr.rtdb, clientID)
+	if errors.Is(err, clientauth.ErrUnknownClientID) {
+		pr.logger.Debug("Login rejected: unknown client id", zap.String("client_id", clientID))
+		return nil, response.Unauthorized(pr.logger, pr.service, clientauth.ErrUnknownClientID.Error())
+	}
+	if err != nil {
+		pr.logger.Warn("Login rejected: failed to load client", zap.Error(err), zap.String("client_id", clientID))
+		return nil, response.Internal(pr.logger, pr.service, err)
+	}
+	return client, nil
+}
+
+func (pr *PublicRouter) validateClientAccountBinding(client *model.Client, account *model.Account) http.HandlerFunc {
+	if client == nil || client.AccountRef == nil {
+		return nil
+	}
+	accountRef := account.GetID()
+	if accountRef == nil || *client.AccountRef != *accountRef {
+		return response.Forbidden(pr.logger, pr.service, "client_account_mismatch", "client is bound to another account")
+	}
+	return nil
+}
+
+func (pr *PublicRouter) validateClientState(r *http.Request, clientID string, client *model.Client) http.HandlerFunc {
+	if client == nil {
+		return response.Unauthorized(pr.logger, pr.service, clientauth.ErrUnknownClientID.Error())
+	}
+	if client.IsRevoked {
+		return response.Forbidden(pr.logger, pr.service, "client_revoked", "client has been revoked")
+	}
+	if h := pr.validateClientIPPolicy(r, clientID, client); h != nil {
+		return h
+	}
+	return nil
+}
+
+func (pr *PublicRouter) validateAPIClient(ctx context.Context, r *http.Request, req *srequest.Login, account *model.Account) http.HandlerFunc {
+	client, h := pr.loadClient(ctx, req.ClientID)
+	if h != nil {
+		return h
+	}
+	if h := pr.validateClientState(r, req.ClientID, client); h != nil {
+		return h
+	}
+	if !hasGrantType(client.GrantTypes, apiLoginGrantType) {
+		return response.Forbidden(pr.logger, pr.service, "client_grant_not_allowed", "client does not allow password grant")
+	}
+	method := strings.ToLower(strings.TrimSpace(client.TokenEndpointAuthMethod))
+	if method == "" {
+		method = apiLoginClientAuthMethod
+	}
+	if method != apiLoginClientAuthMethod {
+		return response.Forbidden(pr.logger, pr.service, "client_auth_method_unsupported", "unsupported client auth method")
+	}
+
+	storedSecret := strings.TrimSpace(client.ClientSecret)
+	if storedSecret == "" {
+		return response.Forbidden(pr.logger, pr.service, "client_secret_missing", "client secret is not configured")
+	}
+	if subtle.ConstantTimeCompare([]byte(storedSecret), []byte(req.ClientSecret)) != 1 {
+		pr.logger.Debug("API login rejected: invalid client secret", zap.String("client_id", req.ClientID))
+		return response.Unauthorized(pr.logger, pr.service, "invalid client secret")
+	}
+	if h := pr.validateClientAccountBinding(client, account); h != nil {
+		return h
+	}
+
+	return nil
+}
+
+func (pr *PublicRouter) resolveLoginClient(ctx context.Context, r *http.Request, clientID string) (*model.Client, http.HandlerFunc) {
+	clientID = strings.TrimSpace(clientID)
+	if clientID == "" {
+		return nil, nil
+	}
+	client, h := pr.loadClient(ctx, clientID)
+	if h != nil {
+		return nil, h
+	}
+	if h := pr.validateClientState(r, clientID, client); h != nil {
+		return nil, h
+	}
+	return client, nil
+}
+
+func (pr *PublicRouter) respondAPILogin(ctx context.Context, r *http.Request, req *srequest.Login, account *model.Account) http.HandlerFunc {
+	if req.ClientID == "" || req.DeviceID == "" {
+		return response.BadRequest(pr.logger, pr.service, "missing_session", "session identifier is required")
+	}
+	return pr.refreshAndRespondLogin(ctx, r, &req.SessionIdentifier, account)
+}
+
+func decodeLogin(r *http.Request, logger mlogger.Logger) (*srequest.Login, http.HandlerFunc) {
+	var req srequest.Login
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		logger.Info("Failed to decode login request", zap.Error(err))
+		return nil, response.BadPayload(logger, mservice.Accounts, err)
+	}
+	req.Login = strings.TrimSpace(req.Login)
+	req.Password = strings.TrimSpace(req.Password)
+	req.ClientID = strings.TrimSpace(req.ClientID)
+	req.DeviceID = strings.TrimSpace(req.DeviceID)
+	req.ClientSecret = strings.TrimSpace(req.ClientSecret)
+
+	if req.Login == "" {
+		return nil, response.BadRequest(logger, mservice.Accounts, "email_missing", "login request has no user name")
+	}
+	if req.Password == "" {
+		return nil, response.BadRequest(logger, mservice.Accounts, "password_missing", "login request has no password")
+	}
+	return &req, nil
+}
+
+func (a *PublicRouter) login(r *http.Request) http.HandlerFunc {
+	req, h := decodeLogin(r, a.logger)
+	if h != nil {
+		return h
+	}
+	client, h := a.resolveLoginClient(r.Context(), r, req.ClientID)
+	if h != nil {
+		return h
+	}
+	account, h := a.authenticateRateLimited(r, req)
+	if h != nil {
+		return h
+	}
+	if h = a.validateClientAccountBinding(client, account); h != nil {
+		return h
+	}
+	return a.respondPendingLogin(account)
+}
+
+func (a *PublicRouter) apiLogin(r *http.Request) http.HandlerFunc {
+	req, h := decodeLogin(r, a.logger)
+	if h != nil {
+		return h
+	}
+	if req.ClientID == "" {
+		return response.BadRequest(a.logger, mservice.Accounts, "client_id_missing", "clientId is required")
+	}
+	if req.ClientSecret == "" {
+		return response.BadRequest(a.logger, mservice.Accounts, "client_secret_missing", "clientSecret is required")
+	}
+	account, h := a.authenticateRateLimited(r, req)
+	if h != nil {
+		return h
+	}
+	if h = a.validateAPIClient(r.Context(), r, req, account); h != nil {
+		return h
+	}
+	return a.respondAPILogin(r.Context(), r, req, account)
+}

backend/edge/shared/internal/transport/http/router/public/login_rate_limit.go

@@ -0,0 +1,179 @@
+package public
+
+import (
+	"context"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/http/ipguard"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/srequest"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/middleware"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/storage/ratelimits"
+	"git.sendico.io/tech/sxchnge/bff/pkg/api/http/response"
+	"git.sendico.io/tech/sxchnge/bff/pkg/merrors"
+	"git.sendico.io/tech/sxchnge/bff/pkg/model"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"go.uber.org/zap"
+)
+
+const (
+	loginScopeAccount = "account"
+	loginScopeIP      = "ip"
+)
+
+var loginRateLimitDecisions = promauto.NewCounterVec(prometheus.CounterOpts{
+	Name: "sendico_login_rate_limit_decisions_total",
+	Help: "Login rate-limit decisions grouped by scope kind and outcome.",
+}, []string{"scope_kind", "outcome"})
+
+type loginRateScope struct {
+	kind        string
+	hash        string
+	limit       int
+	windowStart time.Time
+	expiresAt   time.Time
+}
+
+func (pr *PublicRouter) authenticateRateLimited(
+	r *http.Request,
+	req *srequest.Login,
+) (*model.Account, http.HandlerFunc) {
+	if pr.attempts == nil {
+		account, _, h := pr.authenticateAccount(r.Context(), req)
+		return account, h
+	}
+
+	clock := pr.now
+	if clock == nil {
+		clock = time.Now
+	}
+	now := clock().UTC()
+	scopes := pr.loginRateScopes(r, req.Login, now)
+	if h := pr.checkLoginRateLimits(r.Context(), scopes, now); h != nil {
+		return nil, h
+	}
+
+	account, credentialFailure, h := pr.authenticateAccount(r.Context(), req)
+	if !credentialFailure {
+		for _, scope := range scopes {
+			loginRateLimitDecisions.WithLabelValues(scope.kind, "allowed").Inc()
+		}
+		return account, h
+	}
+
+	limited, retryAfter, failureHandler := pr.recordLoginFailure(r.Context(), scopes, now)
+	if failureHandler != nil {
+		return nil, failureHandler
+	}
+	if limited {
+		return nil, pr.loginRateLimited(retryAfter)
+	}
+	return nil, h
+}
+
+func (pr *PublicRouter) loginRateScopes(r *http.Request, login string, now time.Time) []loginRateScope {
+	normalizedLogin := strings.ToLower(strings.TrimSpace(login))
+	clientIP := "unresolved"
+	if resolved := ipguard.ClientIP(r); resolved != nil {
+		clientIP = resolved.String()
+	}
+	return []loginRateScope{
+		newLoginRateScope(loginScopeAccount, normalizedLogin, pr.limits.PerAccount, now),
+		newLoginRateScope(loginScopeIP, clientIP, pr.limits.PerIP, now),
+	}
+}
+
+func newLoginRateScope(kind, value string, limit middleware.LoginRateLimitWindow, now time.Time) loginRateScope {
+	windowStart := now.Truncate(limit.Window)
+	return loginRateScope{
+		kind:        kind,
+		hash:        ratelimits.HashScope(kind, value),
+		limit:       limit.Limit,
+		windowStart: windowStart,
+		expiresAt:   windowStart.Add(limit.Window),
+	}
+}
+
+func (pr *PublicRouter) checkLoginRateLimits(
+	ctx context.Context,
+	scopes []loginRateScope,
+	now time.Time,
+) http.HandlerFunc {
+	for _, scope := range scopes {
+		count, err := pr.attempts.Current(ctx, scope.kind, scope.hash, scope.windowStart)
+		if err != nil {
+			return pr.loginRateLimitStorageFailure(scope.kind, err)
+		}
+		if count >= scope.limit {
+			loginRateLimitDecisions.WithLabelValues(scope.kind, "denied").Inc()
+			retryAfter := retryAfterDuration(now, scope.expiresAt)
+			pr.logger.Info("Denied login request at rate limit",
+				zap.String("scope_kind", scope.kind),
+				zap.Int64("retry_after_seconds", retryAfterSeconds(retryAfter)))
+			return pr.loginRateLimited(retryAfter)
+		}
+	}
+	return nil
+}
+
+func (pr *PublicRouter) recordLoginFailure(
+	ctx context.Context,
+	scopes []loginRateScope,
+	now time.Time,
+) (bool, time.Duration, http.HandlerFunc) {
+	limited := false
+	var retryAfter time.Duration
+	for _, scope := range scopes {
+		count, err := pr.attempts.Increment(ctx, scope.kind, scope.hash, scope.windowStart, scope.expiresAt)
+		if err != nil {
+			return false, 0, pr.loginRateLimitStorageFailure(scope.kind, err)
+		}
+		if count >= scope.limit {
+			limited = true
+			loginRateLimitDecisions.WithLabelValues(scope.kind, "denied").Inc()
+			scopeRetry := retryAfterDuration(now, scope.expiresAt)
+			if retryAfter == 0 || scopeRetry < retryAfter {
+				retryAfter = scopeRetry
+			}
+			pr.logger.Info("Login failure reached rate limit",
+				zap.String("scope_kind", scope.kind),
+				zap.Int64("retry_after_seconds", retryAfterSeconds(scopeRetry)))
+			continue
+		}
+		loginRateLimitDecisions.WithLabelValues(scope.kind, "allowed").Inc()
+	}
+	return limited, retryAfter, nil
+}
+
+func (pr *PublicRouter) loginRateLimitStorageFailure(scopeKind string, cause error) http.HandlerFunc {
+	loginRateLimitDecisions.WithLabelValues(scopeKind, "error").Inc()
+	pr.logger.Warn("Login protection storage failed", zap.Error(cause), zap.String("scope_kind", scopeKind))
+	err := merrors.OpaqueWrap(merrors.ErrServiceUnavailable, cause, "login protection is temporarily unavailable")
+	return response.Auto(pr.logger, pr.service, err)
+}
+
+func (pr *PublicRouter) loginRateLimited(retryAfter time.Duration) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Retry-After", strconv.FormatInt(retryAfterSeconds(retryAfter), 10))
+		response.TooManyRequests(pr.logger, pr.service, "too many login attempts; try again later")(w, r)
+	}
+}
+
+func retryAfterDuration(now, expiresAt time.Time) time.Duration {
+	retryAfter := expiresAt.Sub(now)
+	if retryAfter <= 0 {
+		return time.Second
+	}
+	return retryAfter
+}
+
+func retryAfterSeconds(retryAfter time.Duration) int64 {
+	seconds := int64((retryAfter + time.Second - 1) / time.Second)
+	if seconds < 1 {
+		return 1
+	}
+	return seconds
+}

backend/edge/shared/internal/transport/http/router/public/login_rate_limit_test.go

@@ -0,0 +1,316 @@
+package public
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/srequest"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/middleware"
+	"git.sendico.io/tech/sxchnge/bff/pkg/merrors"
+	"git.sendico.io/tech/sxchnge/bff/pkg/model"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mservice"
+	"go.uber.org/zap"
+)
+
+type fakeLoginAttemptStore struct {
+	mu           sync.Mutex
+	counts       map[string]int
+	currentErr   error
+	incrementErr error
+}
+
+func newFakeLoginAttemptStore() *fakeLoginAttemptStore {
+	return &fakeLoginAttemptStore{counts: make(map[string]int)}
+}
+
+func (s *fakeLoginAttemptStore) Current(_ context.Context, kind, hash string, start time.Time) (int, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.currentErr != nil {
+		return 0, s.currentErr
+	}
+	return s.counts[attemptKey(kind, hash, start)], nil
+}
+
+func (s *fakeLoginAttemptStore) Increment(
+	_ context.Context,
+	kind, hash string,
+	start, _ time.Time,
+) (int, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.incrementErr != nil {
+		return 0, s.incrementErr
+	}
+	key := attemptKey(kind, hash, start)
+	s.counts[key]++
+	return s.counts[key], nil
+}
+
+func attemptKey(kind, hash string, start time.Time) string {
+	return kind + ":" + hash + ":" + start.UTC().Format(time.RFC3339Nano)
+}
+
+func testLoginLimits(accountLimit, ipLimit int, window time.Duration) middleware.LoginRateLimits {
+	return middleware.LoginRateLimits{
+		PerAccount: middleware.LoginRateLimitWindow{Limit: accountLimit, Window: window},
+		PerIP:      middleware.LoginRateLimitWindow{Limit: ipLimit, Window: window},
+	}
+}
+
+func testRateLimitedRouter(
+	db *testAccountDB,
+	store *fakeLoginAttemptStore,
+	limits middleware.LoginRateLimits,
+	now *time.Time,
+) *PublicRouter {
+	return &PublicRouter{
+		logger:   zap.NewNop(),
+		db:       db,
+		service:  mservice.Accounts,
+		attempts: store,
+		limits:   limits,
+		now: func() time.Time {
+			return *now
+		},
+	}
+}
+
+func loginRequest(login, password, remoteAddr string) (*http.Request, *srequest.Login) {
+	req := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login", nil)
+	req.RemoteAddr = remoteAddr
+	return req, &srequest.Login{LoginData: model.LoginData{
+		UserDataBase: model.UserDataBase{Login: login},
+		Password:     password,
+	}}
+}
+
+func executeLoginHandler(t *testing.T, h http.HandlerFunc, req *http.Request) *httptest.ResponseRecorder {
+	t.Helper()
+	if h == nil {
+		t.Fatal("expected response handler")
+	}
+	recorder := httptest.NewRecorder()
+	h(recorder, req)
+	return recorder
+}
+
+func TestLoginRateLimitNormalizesAccountAndBoundsDistributedAttempts(t *testing.T) {
+	now := time.Date(2026, time.August, 13, 9, 0, 0, 0, time.UTC)
+	store := newFakeLoginAttemptStore()
+	db := &testAccountDB{result: testActiveAccount(t)}
+	router := testRateLimitedRouter(db, store, testLoginLimits(3, 100, 10*time.Minute), &now)
+
+	attempts := []struct {
+		login  string
+		remote string
+		status int
+	}{
+		{login: " User@Example.com ", remote: "192.0.2.1:1000", status: http.StatusUnauthorized},
+		{login: "user@example.com", remote: "192.0.2.2:1000", status: http.StatusUnauthorized},
+		{login: "USER@EXAMPLE.COM", remote: "192.0.2.3:1000", status: http.StatusTooManyRequests},
+	}
+	for _, attempt := range attempts {
+		req, login := loginRequest(attempt.login, "wrong password", attempt.remote)
+		_, h := router.authenticateRateLimited(req, login)
+		recorder := executeLoginHandler(t, h, req)
+		if recorder.Code != attempt.status {
+			t.Fatalf("login %q status: got %d want %d", attempt.login, recorder.Code, attempt.status)
+		}
+	}
+
+	req, login := loginRequest("user@example.com", "correct horse battery staple", "192.0.2.4:1000")
+	_, h := router.authenticateRateLimited(req, login)
+	recorder := executeLoginHandler(t, h, req)
+	if recorder.Code != http.StatusTooManyRequests || recorder.Header().Get("Retry-After") != "600" {
+		t.Fatalf("blocked recovery mismatch: status=%d retry=%q", recorder.Code, recorder.Header().Get("Retry-After"))
+	}
+
+	now = now.Add(10 * time.Minute)
+	account, h := router.authenticateRateLimited(req, login)
+	if h != nil || account == nil {
+		t.Fatalf("expected legitimate login after window expiry, account=%v handler=%v", account, h)
+	}
+}
+
+func TestLoginRateLimitBoundsOneSourceAcrossAccounts(t *testing.T) {
+	now := time.Date(2026, time.August, 13, 9, 0, 0, 0, time.UTC)
+	store := newFakeLoginAttemptStore()
+	router := testRateLimitedRouter(
+		&testAccountDB{err: merrors.ErrNoData},
+		store,
+		testLoginLimits(100, 3, 15*time.Minute),
+		&now,
+	)
+
+	for i, loginValue := range []string{"one@example.com", "two@example.com", "three@example.com"} {
+		req, login := loginRequest(loginValue, "wrong password", "198.51.100.10:9000")
+		_, h := router.authenticateRateLimited(req, login)
+		recorder := executeLoginHandler(t, h, req)
+		want := http.StatusUnauthorized
+		if i == 2 {
+			want = http.StatusTooManyRequests
+		}
+		if recorder.Code != want {
+			t.Fatalf("attempt %d status: got %d want %d", i+1, recorder.Code, want)
+		}
+	}
+}
+
+func TestLoginEndpointReturnsStableRateLimitResponse(t *testing.T) {
+	now := time.Date(2026, time.August, 13, 9, 0, 0, 0, time.UTC)
+	router := testRateLimitedRouter(
+		&testAccountDB{err: merrors.ErrNoData},
+		newFakeLoginAttemptStore(),
+		testLoginLimits(2, 50, 15*time.Minute),
+		&now,
+	)
+	body := `{"login":{"login":"missing@example.com","password":"wrong password"}}`
+
+	for attempt := 1; attempt <= 2; attempt++ {
+		req := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login", strings.NewReader(body))
+		req.RemoteAddr = "198.51.100.20:9000"
+		recorder := httptest.NewRecorder()
+		router.login(req)(recorder, req)
+
+		want := http.StatusUnauthorized
+		if attempt == 2 {
+			want = http.StatusTooManyRequests
+		}
+		if recorder.Code != want {
+			t.Fatalf("attempt %d status: got %d want %d", attempt, recorder.Code, want)
+		}
+		if attempt == 2 {
+			if recorder.Header().Get("Retry-After") != "900" {
+				t.Fatalf("unexpected Retry-After: %q", recorder.Header().Get("Retry-After"))
+			}
+			if !strings.Contains(recorder.Body.String(), `"error":"too_many_requests"`) {
+				t.Fatalf("unexpected 429 body: %s", recorder.Body.String())
+			}
+		}
+	}
+}
+
+func TestInvalidCredentialsDoNotDiscloseAccountExistence(t *testing.T) {
+	request := &srequest.Login{LoginData: model.LoginData{
+		UserDataBase: model.UserDataBase{Login: "user@example.com"},
+		Password:     "wrong password",
+	}}
+
+	responses := make([]*httptest.ResponseRecorder, 0, 2)
+	for _, db := range []*testAccountDB{
+		{result: testActiveAccount(t)},
+		{err: merrors.ErrNoData},
+	} {
+		router := &PublicRouter{logger: zap.NewNop(), db: db, service: mservice.Accounts}
+		_, failed, h := router.authenticateAccount(context.Background(), request)
+		if !failed {
+			t.Fatal("invalid credentials were not classified as a failure")
+		}
+		req, _ := loginRequest("user@example.com", "wrong password", "192.0.2.1:1000")
+		responses = append(responses, executeLoginHandler(t, h, req))
+	}
+
+	if responses[0].Code != http.StatusUnauthorized || responses[1].Code != http.StatusUnauthorized {
+		t.Fatalf("unexpected statuses: existing=%d unknown=%d", responses[0].Code, responses[1].Code)
+	}
+	if responses[0].Body.String() != responses[1].Body.String() ||
+		!strings.Contains(responses[0].Body.String(), "invalid credentials") {
+		t.Fatalf("credential responses differ: existing=%s unknown=%s", responses[0].Body.String(), responses[1].Body.String())
+	}
+}
+
+func TestLoginRateLimitIsAtomicAcrossRouterInstances(t *testing.T) {
+	now := time.Date(2026, time.August, 13, 9, 0, 0, 0, time.UTC)
+	store := newFakeLoginAttemptStore()
+	db := &testAccountDB{err: merrors.ErrNoData}
+	limits := testLoginLimits(5, 1000, 15*time.Minute)
+	routers := []*PublicRouter{
+		testRateLimitedRouter(db, store, limits, &now),
+		testRateLimitedRouter(db, store, limits, &now),
+	}
+
+	var unauthorized atomic.Int64
+	var limited atomic.Int64
+	var wg sync.WaitGroup
+	for i := 0; i < 20; i++ {
+		wg.Add(1)
+		go func(index int) {
+			defer wg.Done()
+			req, login := loginRequest("shared@example.com", "wrong password", "203.0.113."+strconv.Itoa(index+1)+":9000")
+			_, h := routers[index%len(routers)].authenticateRateLimited(req, login)
+			recorder := httptest.NewRecorder()
+			h(recorder, req)
+			switch recorder.Code {
+			case http.StatusUnauthorized:
+				unauthorized.Add(1)
+			case http.StatusTooManyRequests:
+				limited.Add(1)
+			}
+		}(i)
+	}
+	wg.Wait()
+
+	if unauthorized.Load() != 4 || limited.Load() != 16 {
+		t.Fatalf("concurrent decisions: unauthorized=%d limited=%d", unauthorized.Load(), limited.Load())
+	}
+}
+
+func TestLoginRateLimitFailsClosedOnStorageError(t *testing.T) {
+	now := time.Date(2026, time.August, 13, 9, 0, 0, 0, time.UTC)
+	store := newFakeLoginAttemptStore()
+	store.currentErr = merrors.Internal("database unavailable")
+	db := &testAccountDB{result: testActiveAccount(t)}
+	router := testRateLimitedRouter(db, store, testLoginLimits(5, 50, 15*time.Minute), &now)
+	req, login := loginRequest("user@example.com", "correct horse battery staple", "192.0.2.1:1000")
+
+	_, h := router.authenticateRateLimited(req, login)
+	recorder := executeLoginHandler(t, h, req)
+	if recorder.Code != http.StatusServiceUnavailable {
+		t.Fatalf("expected service unavailable, got %d", recorder.Code)
+	}
+	if db.getByEmailCalls != 0 {
+		t.Fatalf("storage failure must stop before password lookup, got %d lookups", db.getByEmailCalls)
+	}
+	if strings.Contains(recorder.Body.String(), "database unavailable") {
+		t.Fatal("storage cause leaked to the public response")
+	}
+}
+
+func TestLoginRateLimitFailsClosedWhenFailureCannotBeRecorded(t *testing.T) {
+	now := time.Date(2026, time.August, 13, 9, 0, 0, 0, time.UTC)
+	store := newFakeLoginAttemptStore()
+	store.incrementErr = merrors.Internal("write unavailable")
+	router := testRateLimitedRouter(
+		&testAccountDB{err: merrors.ErrNoData},
+		store,
+		testLoginLimits(5, 50, 15*time.Minute),
+		&now,
+	)
+	req, login := loginRequest("missing@example.com", "wrong password", "192.0.2.1:1000")
+
+	_, h := router.authenticateRateLimited(req, login)
+	recorder := executeLoginHandler(t, h, req)
+	if recorder.Code != http.StatusServiceUnavailable {
+		t.Fatalf("expected service unavailable, got %d", recorder.Code)
+	}
+	if !strings.Contains(recorder.Body.String(), "login protection is temporarily unavailable") {
+		t.Fatalf("unexpected public failure body: %s", recorder.Body.String())
+	}
+}
+
+func TestDummyPasswordHashRemainsValid(t *testing.T) {
+	if !(&model.Account{Password: dummyPasswordHash}).MatchPassword("sendico-login-dummy-password") {
+		t.Fatal("dummy password hash is not a valid bcrypt hash")
+	}
+	if (&model.Account{Password: dummyPasswordHash}).MatchPassword("different") {
+		t.Fatal("dummy password hash unexpectedly matched another password")
+	}
+}

backend/edge/shared/internal/transport/http/router/public/login_test.go

@@ -0,0 +1,268 @@
+package public
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/srequest"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/middleware"
+	"git.sendico.io/tech/sxchnge/bff/pkg/merrors"
+	"git.sendico.io/tech/sxchnge/bff/pkg/model"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mservice"
+	"github.com/go-chi/chi/v5"
+	"go.uber.org/zap"
+)
+
+func TestLoginRejectsUnknownClientID(t *testing.T) {
+	testRejectsUnknownClientID(t, "/login", `{
+		"login":{"login":"user@example.com","password":"correct horse battery staple"},
+		"clientId":"missing-client",
+		"deviceId":"device-1"
+	}`, 0, func(router *PublicRouter, req *http.Request) http.HandlerFunc {
+		return router.login(req)
+	})
+}
+
+func TestAPILoginRejectsUnknownClientID(t *testing.T) {
+	testRejectsUnknownClientID(t, "/login/api", `{
+		"login":{"login":"user@example.com","password":"correct horse battery staple"},
+		"clientId":"missing-client",
+		"deviceId":"device-1",
+		"clientSecret":"secret"
+	}`, 1, func(router *PublicRouter, req *http.Request) http.HandlerFunc {
+		return router.apiLogin(req)
+	})
+}
+
+func TestLoginAuthenticatesAgainstInjectedAccountStorage(t *testing.T) {
+	account := testActiveAccount(t)
+	unusedDB := &testAccountDB{err: merrors.ErrNoData}
+	activeDB := &testAccountDB{result: account}
+	router := &PublicRouter{
+		logger:  zap.NewNop(),
+		db:      activeDB,
+		service: mservice.Accounts,
+	}
+
+	got, failed, h := router.authenticateAccount(context.Background(), &srequest.Login{
+		LoginData: model.LoginData{
+			UserDataBase: model.UserDataBase{
+				Login: "user@example.com",
+			},
+			Password: "correct horse battery staple",
+		},
+	})
+	if h != nil {
+		t.Fatal("expected login authentication to succeed against injected account store")
+	}
+	if failed {
+		t.Fatal("successful login was classified as a credential failure")
+	}
+	if got == nil || got.Login != account.Login {
+		t.Fatalf("expected account %q, got %#v", account.Login, got)
+	}
+	if activeDB.getByEmailCalls != 1 {
+		t.Fatalf("expected one active account store lookup, got %d", activeDB.getByEmailCalls)
+	}
+	if unusedDB.getByEmailCalls != 0 {
+		t.Fatalf("expected no unused account store lookups, got %d", unusedDB.getByEmailCalls)
+	}
+}
+
+func testRejectsUnknownClientID(
+	t *testing.T,
+	path string,
+	body string,
+	wantLookups int,
+	handler func(*PublicRouter, *http.Request) http.HandlerFunc,
+) {
+	t.Helper()
+
+	account := testActiveAccount(t)
+	accountDB := &testAccountDB{result: account}
+	router := &PublicRouter{
+		logger:  zap.NewNop(),
+		db:      accountDB,
+		rtdb:    &testRefreshTokenDB{clientErr: merrors.ErrNoData},
+		service: mservice.Accounts,
+	}
+
+	req := httptest.NewRequestWithContext(context.Background(), http.MethodPost, path, strings.NewReader(body))
+	rec := httptest.NewRecorder()
+
+	handler(router, req)(rec, req)
+
+	if rec.Code != http.StatusUnauthorized {
+		t.Fatalf("expected status %d, got %d", http.StatusUnauthorized, rec.Code)
+	}
+	if accountDB.getByEmailCalls != wantLookups {
+		t.Fatalf("expected %d account lookups, got %d", wantLookups, accountDB.getByEmailCalls)
+	}
+
+	resp := decodeErrorResponse(t, rec.Body.Bytes())
+	if resp.Data.Details != "unknown client id" {
+		t.Fatalf("expected unknown client id message, got %q", resp.Data.Details)
+	}
+}
+
+func TestLoginRejectsPendingVerificationAccount(t *testing.T) {
+	account := testAccountWithStatus(t, model.AccountPendingVerification)
+	router := &PublicRouter{
+		logger:  zap.NewNop(),
+		db:      &testAccountDB{result: account},
+		service: mservice.Accounts,
+	}
+
+	req := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login", strings.NewReader(`{
+		"login":{"login":"user@example.com","password":"correct horse battery staple"}
+	}`))
+	rec := httptest.NewRecorder()
+
+	router.login(req)(rec, req)
+
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("expected status %d, got %d", http.StatusForbidden, rec.Code)
+	}
+	resp := decodeErrorResponse(t, rec.Body.Bytes())
+	if resp.Data.Details != "Account verification required" {
+		t.Fatalf("expected account verification required message, got %q", resp.Data.Details)
+	}
+}
+
+func TestLoginRejectsBlockedAccount(t *testing.T) {
+	account := testAccountWithStatus(t, model.AccountBlocked)
+	router := &PublicRouter{
+		logger:  zap.NewNop(),
+		db:      &testAccountDB{result: account},
+		service: mservice.Accounts,
+	}
+
+	req := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login", strings.NewReader(`{
+		"login":{"login":"user@example.com","password":"correct horse battery staple"}
+	}`))
+	rec := httptest.NewRecorder()
+
+	router.login(req)(rec, req)
+
+	if rec.Code != http.StatusForbidden {
+		t.Fatalf("expected status %d, got %d", http.StatusForbidden, rec.Code)
+	}
+	resp := decodeErrorResponse(t, rec.Body.Bytes())
+	if resp.Data.Details != "Account verification required" {
+		t.Fatalf("expected account verification required message, got %q", resp.Data.Details)
+	}
+}
+
+func TestAPILoginAllowsLoginAgainAfterRevokeSameSession(t *testing.T) {
+	account := testActiveAccount(t)
+	clientID := "api-client"
+	deviceID := "device-1"
+
+	rtdb := &testRefreshTokenDB{
+		client: &model.Client{
+			ClientID:                clientID,
+			ClientSecret:            "secret",
+			GrantTypes:              []string{"password"},
+			TokenEndpointAuthMethod: "client_secret_post",
+			AccountRef:              account.GetID(),
+		},
+	}
+
+	var cfg middleware.TokenConfig
+	cfg.Length = 16
+	cfg.Expiration.Account = 1
+	cfg.Expiration.Refresh = 24
+
+	signature := middleware.Signature{
+		Algorithm:  "HS256",
+		PrivateKey: []byte("test-secret"),
+	}
+
+	router := NewRouter(
+		zap.NewNop(),
+		"/",
+		&testAccountDB{result: account},
+		nil,
+		rtdb,
+		nil,
+		chi.NewRouter(),
+		&cfg,
+		&signature,
+		middleware.LoginRateLimits{},
+	)
+
+	body := `{
+		"login":{"login":"user@example.com","password":"correct horse battery staple"},
+		"clientId":"api-client",
+		"deviceId":"device-1",
+		"clientSecret":"secret"
+	}`
+
+	firstReq := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login/api", strings.NewReader(body))
+	firstRec := httptest.NewRecorder()
+	router.apiLogin(firstReq)(firstRec, firstReq)
+
+	if firstRec.Code != http.StatusOK {
+		t.Fatalf("expected first login status %d, got %d", http.StatusOK, firstRec.Code)
+	}
+	firstResp := decodeLoginResponse(t, firstRec.Body.Bytes())
+	if firstResp.Data.RefreshToken.Token == "" {
+		t.Fatal("expected first login to return refresh token")
+	}
+
+	err := rtdb.Revoke(context.Background(), *account.GetID(), &model.SessionIdentifier{
+		ClientID: clientID,
+		DeviceID: deviceID,
+	})
+	if err != nil {
+		t.Fatalf("failed to revoke refresh token: %v", err)
+	}
+
+	secondReq := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login/api", strings.NewReader(body))
+	secondRec := httptest.NewRecorder()
+	router.apiLogin(secondReq)(secondRec, secondReq)
+
+	if secondRec.Code != http.StatusOK {
+		t.Fatalf("expected second login status %d, got %d", http.StatusOK, secondRec.Code)
+	}
+	secondResp := decodeLoginResponse(t, secondRec.Body.Bytes())
+	if secondResp.Data.RefreshToken.Token == "" {
+		t.Fatal("expected second login to return refresh token")
+	}
+	if secondResp.Data.RefreshToken.Token == firstResp.Data.RefreshToken.Token {
+		t.Fatal("expected second login to issue a different refresh token after revocation")
+	}
+
+	_, err = rtdb.GetByCRT(context.Background(), &model.ClientRefreshToken{
+		SessionIdentifier: model.SessionIdentifier{
+			ClientID: clientID,
+			DeviceID: deviceID,
+		},
+		RefreshToken: firstResp.Data.RefreshToken.Token,
+	})
+	if !errors.Is(err, merrors.ErrNoData) {
+		t.Fatalf("expected old refresh token to be unusable, got %v", err)
+	}
+
+	_, err = rtdb.GetByCRT(context.Background(), &model.ClientRefreshToken{
+		SessionIdentifier: model.SessionIdentifier{
+			ClientID: clientID,
+			DeviceID: deviceID,
+		},
+		RefreshToken: secondResp.Data.RefreshToken.Token,
+	})
+	if err != nil {
+		t.Fatalf("expected new refresh token to be active, got %v", err)
+	}
+
+	if got := rtdb.tokenCountForSession(*account.GetID(), clientID, deviceID); got != 2 {
+		t.Fatalf("expected 2 refresh token records for session, got %d", got)
+	}
+	if got := rtdb.activeTokenCountForSession(*account.GetID(), clientID, deviceID); got != 1 {
+		t.Fatalf("expected 1 active refresh token for session, got %d", got)
+	}
+}

backend/edge/shared/internal/transport/http/router/public/login_test_support_test.go

@@ -0,0 +1,288 @@
+package public
+
+import (
+	"context"
+	"encoding/json"
+	"sync"
+	"testing"
+
+	"git.sendico.io/tech/sxchnge/bff/pkg/db/repository/builder"
+	"git.sendico.io/tech/sxchnge/bff/pkg/merrors"
+	"git.sendico.io/tech/sxchnge/bff/pkg/model"
+	"go.mongodb.org/mongo-driver/v2/bson"
+)
+
+type testErrorResponse struct {
+	Data struct {
+		Details string `json:"details"`
+	} `json:"data"`
+}
+
+type testLoginResponse struct {
+	Data struct {
+		AccessToken struct {
+			Token string `json:"token"`
+		} `json:"accessToken"`
+		RefreshToken struct {
+			Token string `json:"token"`
+		} `json:"refreshToken"`
+	} `json:"data"`
+}
+
+func decodeErrorResponse(t *testing.T, body []byte) testErrorResponse {
+	t.Helper()
+
+	var resp testErrorResponse
+	if err := json.Unmarshal(body, &resp); err != nil {
+		t.Fatalf("failed to decode response body: %v", err)
+	}
+	return resp
+}
+
+func decodeLoginResponse(t *testing.T, body []byte) testLoginResponse {
+	t.Helper()
+
+	var resp testLoginResponse
+	if err := json.Unmarshal(body, &resp); err != nil {
+		t.Fatalf("failed to decode login response body: %v", err)
+	}
+	return resp
+}
+
+func testActiveAccount(t *testing.T) *model.Account {
+	t.Helper()
+	return testAccountWithStatus(t, model.AccountActive)
+}
+
+func testAccountWithStatus(t *testing.T, status model.AccountStatus) *model.Account {
+	t.Helper()
+
+	account := &model.Account{
+		AccountPublic: model.AccountPublic{
+			UserDataBase: model.UserDataBase{
+				Login: "user@example.com",
+			},
+		},
+		Password: "correct horse battery staple",
+		Status:   status,
+	}
+	account.SetID(bson.NewObjectID())
+	if err := account.HashPassword(); err != nil {
+		t.Fatalf("failed to hash password: %v", err)
+	}
+	return account
+}
+
+type testAccountDB struct {
+	mu              sync.Mutex
+	result          *model.Account
+	err             error
+	getByEmailCalls int
+}
+
+func (db *testAccountDB) GetByEmail(ctx context.Context, email string) (*model.Account, error) {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+	db.getByEmailCalls++
+	return db.result, db.err
+}
+
+func (db *testAccountDB) GetAccountsByRefs(ctx context.Context, orgRef bson.ObjectID, refs []bson.ObjectID) ([]model.Account, error) {
+	return nil, merrors.NotImplemented("stub")
+}
+
+func (db *testAccountDB) Create(ctx context.Context, object *model.Account) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testAccountDB) InsertMany(ctx context.Context, objects []*model.Account) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testAccountDB) Get(ctx context.Context, objectRef bson.ObjectID, result *model.Account) error {
+	if db.err != nil {
+		return db.err
+	}
+	if db.result == nil || db.result.GetID() == nil || *db.result.GetID() != objectRef {
+		return merrors.ErrNoData
+	}
+	*result = *db.result
+	return nil
+}
+
+func (db *testAccountDB) Update(ctx context.Context, object *model.Account) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testAccountDB) Patch(ctx context.Context, objectRef bson.ObjectID, patch builder.Patch) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testAccountDB) Delete(ctx context.Context, objectRef bson.ObjectID) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testAccountDB) DeleteMany(ctx context.Context, query builder.Query) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testAccountDB) DeleteCascade(ctx context.Context, objectRef bson.ObjectID) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testAccountDB) FindOne(ctx context.Context, query builder.Query, result *model.Account) error {
+	return merrors.NotImplemented("stub")
+}
+
+type testRefreshTokenDB struct {
+	client    *model.Client
+	clientErr error
+	tokens    []*model.RefreshToken
+}
+
+func (db *testRefreshTokenDB) GetClient(ctx context.Context, clientID string) (*model.Client, error) {
+	return db.client, db.clientErr
+}
+
+func (db *testRefreshTokenDB) Revoke(ctx context.Context, accountRef bson.ObjectID, session *model.SessionIdentifier) error {
+	for _, token := range db.tokens {
+		if token.AccountRef == nil || *token.AccountRef != accountRef {
+			continue
+		}
+		if token.ClientID == session.ClientID && token.DeviceID == session.DeviceID && !token.IsRevoked {
+			token.IsRevoked = true
+			return nil
+		}
+	}
+	return nil
+}
+
+func (db *testRefreshTokenDB) RevokeToken(ctx context.Context, token *model.ClientRefreshToken) (bool, error) {
+	for _, stored := range db.tokens {
+		if stored.ClientID == token.ClientID && stored.DeviceID == token.DeviceID && stored.RefreshToken == token.RefreshToken && !stored.IsRevoked {
+			stored.IsRevoked = true
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+func (db *testRefreshTokenDB) RevokeAll(ctx context.Context, accountRef bson.ObjectID, deviceID string) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testRefreshTokenDB) GetSession(ctx context.Context, accountRef bson.ObjectID, session *model.SessionIdentifier) (*model.RefreshToken, error) {
+	for _, token := range db.tokens {
+		if token.AccountRef != nil && *token.AccountRef == accountRef && token.ClientID == session.ClientID && token.DeviceID == session.DeviceID && !token.IsRevoked {
+			return cloneRefreshToken(token), nil
+		}
+	}
+	return nil, merrors.ErrNoData
+}
+
+func (db *testRefreshTokenDB) GetByCRT(ctx context.Context, t *model.ClientRefreshToken) (*model.RefreshToken, error) {
+	for _, token := range db.tokens {
+		if token.ClientID == t.ClientID && token.DeviceID == t.DeviceID && token.RefreshToken == t.RefreshToken {
+			if token.IsRevoked {
+				return nil, merrors.ErrNoData
+			}
+			return cloneRefreshToken(token), nil
+		}
+	}
+	return nil, merrors.ErrNoData
+}
+
+func (db *testRefreshTokenDB) Create(ctx context.Context, object *model.RefreshToken) error {
+	for _, token := range db.tokens {
+		if token.AccountRef == nil || object.AccountRef == nil {
+			continue
+		}
+		if *token.AccountRef == *object.AccountRef && token.ClientID == object.ClientID && token.DeviceID == object.DeviceID && !token.IsRevoked {
+			token.RefreshToken = object.RefreshToken
+			token.SessionVersion = object.SessionVersion
+			token.ExpiresAt = object.ExpiresAt
+			token.UserAgent = object.UserAgent
+			token.IPAddress = object.IPAddress
+			token.LastUsedAt = object.LastUsedAt
+			token.IsRevoked = object.IsRevoked
+			if token.GetID() == nil || token.GetID().IsZero() {
+				token.SetID(bson.NewObjectID())
+			}
+			object.SetID(*token.GetID())
+			return nil
+		}
+	}
+
+	clone := cloneRefreshToken(object)
+	if clone.GetID() == nil || clone.GetID().IsZero() {
+		clone.SetID(bson.NewObjectID())
+	}
+	object.SetID(*clone.GetID())
+	db.tokens = append(db.tokens, clone)
+	return nil
+}
+
+func (db *testRefreshTokenDB) InsertMany(ctx context.Context, objects []*model.RefreshToken) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testRefreshTokenDB) Get(ctx context.Context, objectRef bson.ObjectID, result *model.RefreshToken) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testRefreshTokenDB) Update(ctx context.Context, object *model.RefreshToken) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testRefreshTokenDB) Patch(ctx context.Context, objectRef bson.ObjectID, patch builder.Patch) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testRefreshTokenDB) Delete(ctx context.Context, objectRef bson.ObjectID) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testRefreshTokenDB) DeleteMany(ctx context.Context, query builder.Query) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testRefreshTokenDB) DeleteCascade(ctx context.Context, objectRef bson.ObjectID) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testRefreshTokenDB) FindOne(ctx context.Context, query builder.Query, result *model.RefreshToken) error {
+	return merrors.NotImplemented("stub")
+}
+
+func (db *testRefreshTokenDB) tokenCountForSession(accountRef bson.ObjectID, clientID, deviceID string) int {
+	count := 0
+	for _, token := range db.tokens {
+		if token.AccountRef != nil && *token.AccountRef == accountRef && token.ClientID == clientID && token.DeviceID == deviceID {
+			count++
+		}
+	}
+	return count
+}
+
+func (db *testRefreshTokenDB) activeTokenCountForSession(accountRef bson.ObjectID, clientID, deviceID string) int {
+	count := 0
+	for _, token := range db.tokens {
+		if token.AccountRef != nil && *token.AccountRef == accountRef && token.ClientID == clientID && token.DeviceID == deviceID && !token.IsRevoked {
+			count++
+		}
+	}
+	return count
+}
+
+func cloneRefreshToken(token *model.RefreshToken) *model.RefreshToken {
+	if token == nil {
+		return nil
+	}
+
+	cloned := *token
+	if token.AccountRef != nil {
+		accountRef := *token.AccountRef
+		cloned.AccountRef = &accountRef
+	}
+	return &cloned
+}

backend/edge/shared/internal/transport/http/router/public/logout.go

@@ -0,0 +1,55 @@
+package public
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/auth/browser"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/auth/sessionmetrics"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/srequest"
+	"git.sendico.io/tech/sxchnge/bff/pkg/api/http/response"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mservice"
+	"go.uber.org/zap"
+)
+
+func (pr *PublicRouter) logout(r *http.Request) http.HandlerFunc {
+	respond := func(handler http.HandlerFunc, clearCookie bool) http.HandlerFunc {
+		if !clearCookie || !browser.UsesCookie(r) {
+			return handler
+		}
+		return func(w http.ResponseWriter, request *http.Request) {
+			browser.ClearRefreshCookie(w, request)
+			handler.ServeHTTP(w, request)
+		}
+	}
+	var req srequest.AccessTokenRefresh
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		pr.logger.Info("Rejected malformed logout request", zap.Error(err))
+		return respond(response.BadPayload(pr.logger, mservice.RefreshTokens, err), false)
+	}
+	credential, err := browser.RefreshCredential(r, req.RefreshToken)
+	if err != nil {
+		sessionmetrics.Observe(sessionmetrics.CurrentLogout, sessionmetrics.AlreadyInactive)
+		return respond(response.Success(pr.logger), true)
+	}
+	req.RefreshToken = credential
+	if req.ClientID == "" || req.DeviceID == "" || req.RefreshToken == "" {
+		sessionmetrics.Observe(sessionmetrics.CurrentLogout, sessionmetrics.MissingIdentity)
+		return respond(response.BadRequest(pr.logger, pr.service, "missing_session", "refresh token and session identifier are required"), false)
+	}
+
+	revoked, err := pr.rtdb.RevokeToken(r.Context(), &req)
+	if err != nil {
+		sessionmetrics.Observe(sessionmetrics.CurrentLogout, sessionmetrics.StorageError)
+		pr.logger.Warn("Failed to revoke current session", zap.Error(err),
+			zap.String("client_id", req.ClientID), zap.String("device_id", req.DeviceID))
+		return respond(response.Internal(pr.logger, pr.service, err), false)
+	}
+	if !revoked {
+		sessionmetrics.Observe(sessionmetrics.CurrentLogout, sessionmetrics.AlreadyInactive)
+		return respond(response.Success(pr.logger), true)
+	}
+	sessionmetrics.Observe(sessionmetrics.CurrentLogout, sessionmetrics.Succeeded)
+	pr.logger.Info("Current session revoked", zap.String("client_id", req.ClientID), zap.String("device_id", req.DeviceID))
+	return respond(response.Success(pr.logger), true)
+}

backend/edge/shared/internal/transport/http/router/public/logout_test.go

@@ -0,0 +1,204 @@
+package public
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/auth/browser"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/storage/refreshtokens"
+	"git.sendico.io/tech/sxchnge/bff/pkg/merrors"
+	"git.sendico.io/tech/sxchnge/bff/pkg/model"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mservice"
+	"github.com/stretchr/testify/require"
+	"go.mongodb.org/mongo-driver/v2/bson"
+	"go.uber.org/zap"
+)
+
+type logoutDB struct {
+	refreshtokens.DB
+	mu        sync.Mutex
+	tokens    map[string]*model.RefreshToken
+	lookupErr error
+	revokeErr error
+}
+
+func (db *logoutDB) RevokeToken(_ context.Context, request *model.ClientRefreshToken) (bool, error) {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+	if db.lookupErr != nil {
+		return false, db.lookupErr
+	}
+	token := db.tokens[request.DeviceID]
+	if token == nil || token.IsRevoked || token.RefreshToken != request.RefreshToken {
+		return false, nil
+	}
+	if db.revokeErr != nil {
+		return false, db.revokeErr
+	}
+	token.IsRevoked = true
+	return true, nil
+}
+
+func newLogoutToken(accountRef bson.ObjectID, deviceID, value string) *model.RefreshToken {
+	return &model.RefreshToken{
+		ClientRefreshToken: model.ClientRefreshToken{
+			SessionIdentifier: model.SessionIdentifier{ClientID: "web", DeviceID: deviceID, SessionVersion: "version-" + deviceID},
+			RefreshToken:      value,
+		},
+		AccountRef: &accountRef,
+		ExpiresAt:  time.Now().Add(time.Hour),
+	}
+}
+
+func executeLogout(router *PublicRouter, deviceID, refreshToken string) int {
+	body := `{"clientId":"web","deviceId":"` + deviceID + `","token":"` + refreshToken + `"}`
+	request := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/accounts/logout", strings.NewReader(body))
+	response := httptest.NewRecorder()
+	router.logout(request)(response, request)
+	return response.Code
+}
+
+func TestLogoutRevokesOnlyCurrentSessionAndIsIdempotent(t *testing.T) {
+	accountRef := bson.NewObjectID()
+	db := &logoutDB{tokens: map[string]*model.RefreshToken{
+		"device-a": newLogoutToken(accountRef, "device-a", "refresh-a"),
+		"device-b": newLogoutToken(accountRef, "device-b", "refresh-b"),
+	}}
+	router := &PublicRouter{logger: zap.NewNop(), rtdb: db, service: mservice.Accounts}
+
+	if status := executeLogout(router, "device-a", "refresh-a"); status != http.StatusOK {
+		t.Fatalf("first logout status = %d", status)
+	}
+	if status := executeLogout(router, "device-a", "refresh-a"); status != http.StatusOK {
+		t.Fatalf("repeated logout status = %d", status)
+	}
+	if !db.tokens["device-a"].IsRevoked {
+		t.Fatal("current device session was not revoked")
+	}
+	if db.tokens["device-b"].IsRevoked {
+		t.Fatal("another device session was revoked")
+	}
+}
+
+func TestConcurrentLogoutIsIdempotent(t *testing.T) {
+	accountRef := bson.NewObjectID()
+	db := &logoutDB{tokens: map[string]*model.RefreshToken{
+		"device-a": newLogoutToken(accountRef, "device-a", "refresh-a"),
+	}}
+	router := &PublicRouter{logger: zap.NewNop(), rtdb: db, service: mservice.Accounts}
+
+	statuses := make(chan int, 8)
+	var workers sync.WaitGroup
+	for range 8 {
+		workers.Add(1)
+		go func() {
+			defer workers.Done()
+			statuses <- executeLogout(router, "device-a", "refresh-a")
+		}()
+	}
+	workers.Wait()
+	close(statuses)
+	for status := range statuses {
+		if status != http.StatusOK {
+			t.Fatalf("concurrent logout status = %d", status)
+		}
+	}
+}
+
+func TestDelayedLogoutDoesNotRevokeReplacementSession(t *testing.T) {
+	accountRef := bson.NewObjectID()
+	db := &logoutDB{tokens: map[string]*model.RefreshToken{
+		"device-a": newLogoutToken(accountRef, "device-a", "new-refresh"),
+	}}
+	router := &PublicRouter{logger: zap.NewNop(), rtdb: db, service: mservice.Accounts}
+
+	if status := executeLogout(router, "device-a", "old-refresh"); status != http.StatusOK {
+		t.Fatalf("delayed logout status = %d", status)
+	}
+	if db.tokens["device-a"].IsRevoked {
+		t.Fatal("replacement session was revoked by a stale logout request")
+	}
+}
+
+func TestLogoutAcceptsAnAlreadyExpiredSession(t *testing.T) {
+	accountRef := bson.NewObjectID()
+	expired := newLogoutToken(accountRef, "device-a", "expired-refresh")
+	expired.ExpiresAt = time.Now().Add(-time.Hour)
+	db := &logoutDB{tokens: map[string]*model.RefreshToken{"device-a": expired}}
+	router := &PublicRouter{logger: zap.NewNop(), rtdb: db, service: mservice.Accounts}
+
+	if status := executeLogout(router, "device-a", "expired-refresh"); status != http.StatusOK {
+		t.Fatalf("expired logout status = %d", status)
+	}
+	if !expired.IsRevoked {
+		t.Fatal("expired session was not marked revoked before cleanup")
+	}
+}
+
+func TestLogoutFailsClosedWhenSessionStoreIsUnavailable(t *testing.T) {
+	db := &logoutDB{lookupErr: merrors.Internal("database unavailable")}
+	router := &PublicRouter{logger: zap.NewNop(), rtdb: db, service: mservice.Accounts}
+	if status := executeLogout(router, "device-a", "refresh-a"); status != http.StatusInternalServerError {
+		t.Fatalf("logout status = %d, want %d", status, http.StatusInternalServerError)
+	}
+}
+
+func TestBrowserLogoutUsesCookieCredentialAndClearsIt(t *testing.T) {
+	accountRef := bson.NewObjectID()
+	token := newLogoutToken(accountRef, "device-a", "cookie-refresh")
+	db := &logoutDB{tokens: map[string]*model.RefreshToken{"device-a": token}}
+	router := &PublicRouter{logger: zap.NewNop(), rtdb: db, service: mservice.Accounts}
+	body := `{"clientId":"web","deviceId":"device-a","token":"body-must-be-ignored"}`
+	request := httptest.NewRequest(http.MethodPost, "https://app.sendico.io/api/v1/accounts/logout", strings.NewReader(body))
+	request.Header.Set(browser.TransportHeader, browser.TransportCookie)
+	request.AddCookie(&http.Cookie{Name: browser.RefreshCookie, Value: "cookie-refresh"})
+	response := httptest.NewRecorder()
+
+	router.logout(request)(response, request)
+
+	require.Equal(t, http.StatusOK, response.Code)
+	require.True(t, token.IsRevoked)
+	cookies := response.Result().Cookies()
+	require.Len(t, cookies, 1)
+	require.Equal(t, browser.RefreshCookie, cookies[0].Name)
+	require.Equal(t, -1, cookies[0].MaxAge)
+	require.Equal(t, "/api/v1/accounts", cookies[0].Path)
+}
+
+func TestBrowserLogoutWithoutCookieIsIdempotentAndClearsBrowserState(t *testing.T) {
+	db := &logoutDB{tokens: map[string]*model.RefreshToken{}}
+	router := &PublicRouter{logger: zap.NewNop(), rtdb: db, service: mservice.Accounts}
+	body := `{"clientId":"web","deviceId":"device-a","token":"body-must-be-ignored"}`
+	request := httptest.NewRequest(http.MethodPost, "https://app.sendico.io/api/v1/accounts/logout", strings.NewReader(body))
+	request.Header.Set(browser.TransportHeader, browser.TransportCookie)
+	response := httptest.NewRecorder()
+
+	router.logout(request)(response, request)
+
+	require.Equal(t, http.StatusOK, response.Code)
+	require.Contains(t, response.Header().Get("Set-Cookie"), browser.RefreshCookie+"=")
+	require.Contains(t, response.Header().Get("Set-Cookie"), "Max-Age=0")
+}
+
+func TestBrowserLogoutKeepsCookieWhenRevocationFails(t *testing.T) {
+	db := &logoutDB{
+		tokens:    map[string]*model.RefreshToken{},
+		lookupErr: merrors.Internal("database unavailable"),
+	}
+	router := &PublicRouter{logger: zap.NewNop(), rtdb: db, service: mservice.Accounts}
+	body := `{"clientId":"web","deviceId":"device-a"}`
+	request := httptest.NewRequest(http.MethodPost, "https://app.sendico.io/api/v1/accounts/logout", strings.NewReader(body))
+	request.Header.Set(browser.TransportHeader, browser.TransportCookie)
+	request.AddCookie(&http.Cookie{Name: browser.RefreshCookie, Value: "cookie-refresh"})
+	response := httptest.NewRecorder()
+
+	router.logout(request)(response, request)
+
+	require.Equal(t, http.StatusInternalServerError, response.Code)
+	require.Empty(t, response.Header().Get("Set-Cookie"), "client must retain the cookie so logout can retry revocation")
+}

backend/edge/shared/internal/transport/http/router/public/refresh.go

@@ -0,0 +1,53 @@
+package public
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"time"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/auth/browser"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/srequest"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/sresponse"
+	"git.sendico.io/tech/sxchnge/bff/pkg/api/http/response"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mservice"
+	"go.uber.org/zap"
+)
+
+func (pr *PublicRouter) refreshAccessToken(r *http.Request) http.HandlerFunc {
+	pr.logger.Debug("Processing access token refresh request")
+	var req srequest.AccessTokenRefresh
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		pr.logger.Info("Failed to decode token rotation request", zap.Error(err))
+		return response.BadPayload(pr.logger, mservice.RefreshTokens, err)
+	}
+
+	account, token, refreshToken, err := pr.validateRefreshToken(r.Context(), r, &req)
+	if err != nil {
+		if errors.Is(err, errClientIPNotAllowed) {
+			return response.Forbidden(pr.logger, pr.service, "ip_not_allowed", "request ip is not allowed for this client")
+		}
+		if isExpectedRefreshValidationError(err) {
+			pr.logger.Debug("Access token refresh rejected", zap.Error(err))
+			return pr.rejectRefresh(r, err)
+		}
+		pr.logger.Warn("Failed to process access token refreshment request", zap.Error(err))
+		return response.Auto(pr.logger, pr.service, err)
+	}
+	if browser.UsesCookie(r) && refreshToken.ExpiresAt.Before(time.Now().Add(7*24*time.Hour)) {
+		return pr.refreshAndRespondLogin(r.Context(), r, &refreshToken.SessionIdentifier, account)
+	}
+
+	return sresponse.Account(pr.logger, account, token)
+}
+
+func (pr *PublicRouter) rejectRefresh(r *http.Request, err error) http.HandlerFunc {
+	handler := response.Auto(pr.logger, pr.service, err)
+	if !browser.UsesCookie(r) {
+		return handler
+	}
+	return func(w http.ResponseWriter, request *http.Request) {
+		browser.ClearRefreshCookie(w, request)
+		handler.ServeHTTP(w, request)
+	}
+}

backend/edge/shared/internal/transport/http/router/public/refresh_test.go

@@ -0,0 +1,137 @@
+package public
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/auth/browser"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/middleware"
+	"git.sendico.io/tech/sxchnge/bff/pkg/model"
+	"github.com/go-chi/chi/v5"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap"
+)
+
+func newBrowserRefreshRouter(t *testing.T, expiresAt time.Time) (*PublicRouter, *testRefreshTokenDB) {
+	t.Helper()
+	account := testActiveAccount(t)
+	clientID := "web"
+	deviceID := "browser-1"
+	rtdb := &testRefreshTokenDB{
+		client: &model.Client{ClientID: clientID},
+		tokens: []*model.RefreshToken{
+			{
+				ClientRefreshToken: model.ClientRefreshToken{
+					SessionIdentifier: model.SessionIdentifier{
+						ClientID:       clientID,
+						DeviceID:       deviceID,
+						SessionVersion: "version-1",
+					},
+					RefreshToken: "cookie-refresh",
+				},
+				AccountRef: account.GetID(),
+				ExpiresAt:  expiresAt,
+			},
+		},
+	}
+	config := middleware.TokenConfig{
+		Expiration: middleware.TokenExpiration{Account: 1, Refresh: 720},
+		Length:     32,
+	}
+	signature := middleware.Signature{
+		Algorithm:  "HS256",
+		PrivateKey: []byte("browser-refresh-test-secret"),
+	}
+	return NewRouter(
+		zap.NewNop(),
+		"/api/v1",
+		&testAccountDB{result: account},
+		nil,
+		rtdb,
+		nil,
+		chi.NewRouter(),
+		&config,
+		&signature,
+		middleware.LoginRateLimits{},
+	), rtdb
+}
+
+func executeBrowserRefresh(t *testing.T, router *PublicRouter) *httptest.ResponseRecorder {
+	t.Helper()
+	body := `{"clientId":"web","deviceId":"browser-1","token":"body-must-be-ignored"}`
+	request := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "https://app.sendico.io/api/v1/accounts/refresh", strings.NewReader(body))
+	request.Header.Set(browser.TransportHeader, browser.TransportCookie)
+	request.AddCookie(&http.Cookie{Name: browser.RefreshCookie, Value: "cookie-refresh"})
+	response := httptest.NewRecorder()
+	router.refreshAccessToken(request)(response, request)
+	return response
+}
+
+func executeNativeRefresh(t *testing.T, router *PublicRouter, token string) *httptest.ResponseRecorder {
+	t.Helper()
+	body := `{"clientId":"web","deviceId":"browser-1","token":"` + token + `"}`
+	request := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "https://app.sendico.io/api/v1/accounts/refresh", strings.NewReader(body))
+	response := httptest.NewRecorder()
+	router.refreshAccessToken(request)(response, request)
+	return response
+}
+
+func TestBrowserRefreshRestoresAccessWithoutExposingRefreshCredential(t *testing.T) {
+	router, _ := newBrowserRefreshRouter(t, time.Now().Add(30*24*time.Hour))
+
+	response := executeBrowserRefresh(t, router)
+
+	require.Equal(t, http.StatusOK, response.Code)
+	require.NotContains(t, response.Body.String(), "cookie-refresh")
+	require.NotEmpty(t, decodeLoginResponse(t, response.Body.Bytes()).Data.AccessToken.Token)
+	require.Empty(t, response.Header().Get("Set-Cookie"))
+}
+
+func TestBrowserRefreshRotatesExpiringCookieServerSide(t *testing.T) {
+	t.Setenv("API_ENDPOINT", "/api/v1")
+	router, rtdb := newBrowserRefreshRouter(t, time.Now().Add(24*time.Hour))
+
+	response := executeBrowserRefresh(t, router)
+
+	require.Equal(t, http.StatusOK, response.Code)
+	require.NotContains(t, response.Body.String(), "cookie-refresh")
+	cookies := response.Result().Cookies()
+	require.Len(t, cookies, 1)
+	require.Equal(t, browser.RefreshCookie, cookies[0].Name)
+	require.NotEqual(t, "cookie-refresh", cookies[0].Value)
+	require.Empty(t, decodeLoginResponse(t, response.Body.Bytes()).Data.RefreshToken.Token)
+	require.Equal(t, cookies[0].Value, rtdb.tokens[0].RefreshToken)
+}
+
+func TestBrowserRefreshRejectsStaleCookieAndClearsIt(t *testing.T) {
+	t.Setenv("API_ENDPOINT", "/api/v1")
+	router, rtdb := newBrowserRefreshRouter(t, time.Now().Add(30*24*time.Hour))
+	rtdb.tokens = nil
+
+	response := executeBrowserRefresh(t, router)
+
+	require.Equal(t, http.StatusUnauthorized, response.Code)
+	require.Contains(t, response.Body.String(), `"error":"unauthorized"`)
+	require.NotContains(t, response.Body.String(), "cookie-refresh")
+	cookies := response.Result().Cookies()
+	require.Len(t, cookies, 1)
+	require.Equal(t, browser.RefreshCookie, cookies[0].Name)
+	require.Empty(t, cookies[0].Value)
+	require.Equal(t, -1, cookies[0].MaxAge)
+	require.True(t, cookies[0].HttpOnly)
+	require.True(t, cookies[0].Secure)
+}
+
+func TestNativeRefreshRejectsStaleTokenWithoutCookieMutation(t *testing.T) {
+	router, _ := newBrowserRefreshRouter(t, time.Now().Add(30*24*time.Hour))
+
+	response := executeNativeRefresh(t, router, "stale-refresh")
+
+	require.Equal(t, http.StatusUnauthorized, response.Code)
+	require.Contains(t, response.Body.String(), `"error":"unauthorized"`)
+	require.Empty(t, response.Header().Get("Set-Cookie"))
+}

backend/edge/shared/internal/transport/http/router/public/respond.go

@@ -0,0 +1,48 @@
+package public
+
+import (
+	"context"
+	"net/http"
+
+	rtokens "git.sendico.io/tech/sxchnge/bff/edge/shared/auth/tokens"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/sresponse"
+	"git.sendico.io/tech/sxchnge/bff/pkg/api/http/response"
+	"git.sendico.io/tech/sxchnge/bff/pkg/model"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mutil/mzap"
+	"go.uber.org/zap"
+)
+
+func (pr *PublicRouter) refreshAndRespondLogin(
+	ctx context.Context,
+	r *http.Request,
+	session *model.SessionIdentifier,
+	account *model.Account,
+) http.HandlerFunc {
+	refreshToken, err := rtokens.PrepareRefreshToken(
+		ctx,
+		r,
+		pr.rtdb,
+		pr.config.Length,
+		pr.config.Expiration.Refresh,
+		session,
+		account,
+		pr.logger,
+	)
+	if err != nil {
+		pr.logger.Warn("Failed to create refresh token", zap.Error(err), mzap.StorableRef(account),
+			zap.String("client_id", session.ClientID), zap.String("device_id", session.DeviceID))
+		return response.Internal(pr.logger, pr.service, err)
+	}
+	accessToken, err := pr.imp.CreateAccessTokenForSession(account, refreshToken.SessionIdentifier)
+	if err != nil {
+		pr.logger.Warn("Failed to generate access token", zap.Error(err), mzap.StorableRef(account),
+			zap.String("client_id", session.ClientID), zap.String("device_id", session.DeviceID))
+		return response.Internal(pr.logger, pr.service, err)
+	}
+
+	token := sresponse.TokenData{
+		Token:      refreshToken.RefreshToken,
+		Expiration: refreshToken.ExpiresAt,
+	}
+	return sresponse.Login(pr.logger, account, &accessToken, &token)
+}

backend/edge/shared/internal/transport/http/router/public/rotate.go

@@ -0,0 +1,36 @@
+package public
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/srequest"
+	"git.sendico.io/tech/sxchnge/bff/pkg/api/http/response"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mservice"
+	"go.uber.org/zap"
+)
+
+func (pr *PublicRouter) rotateRefreshToken(r *http.Request) http.HandlerFunc {
+	pr.logger.Debug("Processing token rotation request...")
+	var req srequest.TokenRefreshRotate
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		pr.logger.Info("Failed to decode token rotation request", zap.Error(err))
+		return response.BadPayload(pr.logger, mservice.RefreshTokens, err)
+	}
+
+	account, _, _, err := pr.validateRefreshToken(r.Context(), r, &req)
+	if err != nil {
+		if errors.Is(err, errClientIPNotAllowed) {
+			return response.Forbidden(pr.logger, pr.service, "ip_not_allowed", "request ip is not allowed for this client")
+		}
+		if isExpectedRefreshValidationError(err) {
+			pr.logger.Debug("Refresh token rotation rejected", zap.Error(err))
+			return pr.rejectRefresh(r, err)
+		}
+		pr.logger.Warn("Failed to validate refresh token", zap.Error(err))
+		return response.Auto(pr.logger, pr.service, err)
+	}
+
+	return pr.refreshAndRespondLogin(r.Context(), r, &req.SessionIdentifier, account)
+}

backend/edge/shared/internal/transport/http/router/public/router.go

@@ -0,0 +1,69 @@
+package public
+
+import (
+	"time"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/sresponse"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/middleware"
+	re "git.sendico.io/tech/sxchnge/bff/edge/shared/internal/transport/http/router/endpoint"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/storage/ratelimits"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/storage/refreshtokens"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/storage/verification"
+	api "git.sendico.io/tech/sxchnge/bff/pkg/api/http"
+	"git.sendico.io/tech/sxchnge/bff/pkg/db/account"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mlogger"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mservice"
+	"github.com/go-chi/chi/v5"
+)
+
+type PublicRouter struct {
+	logger    mlogger.Logger
+	db        account.DB
+	imp       *re.HttpEndpointRouter
+	rtdb      refreshtokens.DB
+	config    middleware.TokenConfig
+	signature middleware.Signature
+	service   mservice.Type
+	attempts  ratelimits.Store
+	limits    middleware.LoginRateLimits
+	now       func() time.Time
+}
+
+func (pr *PublicRouter) InstallHandler(service mservice.Type, endpoint string, method api.HTTPMethod, handler sresponse.HandlerFunc) {
+	pr.imp.InstallHandler(service, endpoint, method, handler)
+}
+
+func NewRouter(
+	logger mlogger.Logger,
+	apiEndpoint string,
+	db account.DB,
+	vdb verification.DB,
+	rtdb refreshtokens.DB,
+	attempts ratelimits.Store,
+	router chi.Router,
+	config *middleware.TokenConfig,
+	signature *middleware.Signature,
+	limits middleware.LoginRateLimits,
+) *PublicRouter {
+	l := logger.Named("public")
+	hr := PublicRouter{
+		logger:    l,
+		db:        db,
+		rtdb:      rtdb,
+		config:    *config,
+		signature: *signature,
+		imp:       re.NewHttpEndpointRouter(l, apiEndpoint, router, config, signature),
+		service:   mservice.Accounts,
+		attempts:  attempts,
+		limits:    limits,
+		now:       time.Now,
+	}
+
+	hr.InstallHandler(hr.service, "/login", api.Post, hr.login)
+	hr.InstallHandler(hr.service, "/login/api", api.Post, hr.apiLogin)
+	hr.InstallHandler(hr.service, "/rotate", api.Post, hr.rotateRefreshToken)
+	hr.InstallHandler(hr.service, "/refresh", api.Post, hr.refreshAccessToken)
+	hr.InstallHandler(hr.service, "/logout", api.Post, hr.logout)
+
+	return &hr
+}

backend/edge/shared/internal/transport/http/router/public/validate.go

@@ -0,0 +1,98 @@
+package public
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"time"
+
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/auth/browser"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/srequest"
+	"git.sendico.io/tech/sxchnge/bff/edge/shared/interface/api/sresponse"
+	"git.sendico.io/tech/sxchnge/bff/pkg/merrors"
+	"git.sendico.io/tech/sxchnge/bff/pkg/model"
+	"git.sendico.io/tech/sxchnge/bff/pkg/mutil/mzap"
+	"go.uber.org/zap"
+)
+
+var errClientIPNotAllowed = merrors.Define("client_ip_not_allowed")
+
+func isExpectedRefreshValidationError(err error) bool {
+	return errors.Is(err, merrors.ErrUnauthorized)
+}
+
+func validateToken(token string, rt *model.RefreshToken) string {
+	if rt.AccountRef == nil {
+		return "missing account reference"
+	}
+	if token != rt.RefreshToken {
+		return "tokens do not match"
+	}
+	if rt.ExpiresAt.Before(time.Now()) {
+		return "token expired"
+	}
+	if rt.IsRevoked {
+		return "token has been revoked"
+	}
+
+	return ""
+}
+
+func (pr *PublicRouter) validateRefreshToken(ctx context.Context, r *http.Request, req *srequest.TokenRefreshRotate) (*model.Account, *sresponse.TokenData, *model.RefreshToken, error) {
+	credential, err := browser.RefreshCredential(r, req.RefreshToken)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	req.RefreshToken = credential
+	client, err := pr.rtdb.GetClient(ctx, req.ClientID)
+	if errors.Is(err, merrors.ErrNoData) || client == nil {
+		pr.logger.Debug("Refresh token rejected: client not found", zap.String("client_id", req.ClientID))
+		return nil, nil, nil, merrors.Unauthorized("client not found")
+	}
+	if err != nil {
+		pr.logger.Warn("Failed to fetch client for refresh token validation", zap.Error(err), zap.String("client_id", req.ClientID))
+		return nil, nil, nil, err
+	}
+	if client.IsRevoked {
+		return nil, nil, nil, merrors.Unauthorized("client has been revoked")
+	}
+	if h := pr.validateClientIPPolicy(r, req.ClientID, client); h != nil {
+		return nil, nil, nil, errClientIPNotAllowed
+	}
+
+	rt, err := pr.rtdb.GetByCRT(ctx, req)
+	if errors.Is(err, merrors.ErrNoData) || errors.Is(err, merrors.ErrAccessDenied) {
+		pr.logger.Debug("Refresh session is inactive", zap.String("client_id", req.ClientID), zap.String("device_id", req.DeviceID))
+		return nil, nil, nil, merrors.Unauthorized("refresh session is inactive")
+	}
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	if rt.SessionVersion == "" {
+		pr.logger.Debug("Refresh token rejected: legacy session requires reauthentication",
+			zap.String("client_id", req.ClientID), zap.String("device_id", req.DeviceID))
+		return nil, nil, nil, merrors.Unauthorized("session reauthentication required")
+	}
+
+	if reason := validateToken(req.RefreshToken, rt); len(reason) > 0 {
+		pr.logger.Debug("Token validation failed", zap.String("reason", reason))
+		return nil, nil, nil, merrors.Unauthorized(reason)
+	}
+
+	var account model.Account
+	if err := pr.db.Get(ctx, *rt.AccountRef, &account); errors.Is(err, merrors.ErrNoData) {
+		pr.logger.Debug("User not found while rotating refresh token", zap.Error(err), mzap.AccRef(*rt.AccountRef))
+		return nil, nil, nil, merrors.Unauthorized("user not found")
+	} else if err != nil {
+		pr.logger.Warn("Failed to fetch user while validating refresh token", zap.Error(err), mzap.AccRef(*rt.AccountRef))
+		return nil, nil, nil, err
+	}
+
+	accessToken, err := pr.imp.CreateAccessTokenForSession(&account, rt.SessionIdentifier)
+	if err != nil {
+		pr.logger.Warn("Failed to generate access token", zap.Error(err))
+		return nil, nil, nil, err
+	}
+
+	return &account, &accessToken, rt, nil
+}