feat: handle zero SessionMaxAge in GenerateSessionToken to prevent immediate expiration

Signed-off-by: Noooste <83548733+Noooste@users.noreply.github.com>

backend/internal/auth/auth.go

@@ -356,9 +356,18 @@ func (a *Service) ValidateAndConsumeState(token string) bool {
 	return a.jwtService.ValidateAndConsumeState(token)
 }
 
-// GenerateSessionToken generates a JWT session token for the user
+// GenerateSessionToken generates a JWT session token for the user.
+//
+// SessionMaxAge lives under the OIDC config block, but the JWT is shared with
+// admin-only deployments that never set it. Treat a non-positive value as
+// "not configured" and fall back to 24h so the token isn't issued already
+// expired (which would make every subsequent request fail with 401).
 func (a *Service) GenerateSessionToken(userInfo *UserInfo) (string, error) {
-	return a.jwtService.GenerateToken(userInfo, a.authConfig.OIDC.SessionMaxAge)
+	maxAge := a.authConfig.OIDC.SessionMaxAge
+	if maxAge <= 0 {
+		maxAge = 86400
+	}
+	return a.jwtService.GenerateToken(userInfo, maxAge)
 }
 
 // ValidateSessionToken validates a JWT session token and returns user info

backend/internal/auth/auth_test.go

@@ -68,3 +68,31 @@ func TestExtractRolesFromAccessToken_Malformed(t *testing.T) {
 		t.Fatalf("expected nil for empty token, got %v", roles)
 	}
 }
+
+// Regression for issue #16: admin-only deployments never set
+// OIDC.SessionMaxAge, leaving it at 0. Before the fix, that produced a JWT
+// whose exp == iat, so every request after /auth/login was rejected as
+// expired and the client saw UNAUTHORIZED.
+func TestGenerateSessionToken_ZeroSessionMaxAge_IsNotImmediatelyExpired(t *testing.T) {
+	jwtSvc, err := NewJWTService()
+	if err != nil {
+		t.Fatalf("NewJWTService: %v", err)
+	}
+
+	svc := &Service{
+		authConfig: &config.AuthConfig{
+			Admin: config.AdminAuthConfig{Enabled: true, Username: "admin", Password: "pw"},
+			// OIDC disabled; SessionMaxAge left at zero value.
+		},
+		jwtService: jwtSvc,
+	}
+
+	token, err := svc.GenerateSessionToken(&UserInfo{Username: "admin"})
+	if err != nil {
+		t.Fatalf("GenerateSessionToken: %v", err)
+	}
+
+	if _, err := svc.ValidateSessionToken(token); err != nil {
+		t.Fatalf("freshly issued admin session token failed validation: %v", err)
+	}
+}