fix: preserve license state across panel upgrades (#544)

go-backend/internal/http/handler/license_validation.go

@@ -0,0 +1,48 @@
+package handler
+
+import (
+	"fmt"
+	"strings"
+
+	"go-backend/internal/license"
+)
+
+const keygenAccountID = "1bc96cac-09de-4cf4-af34-26afdad63a90"
+
+var newLicenseClient = license.NewKeygenClient
+
+func licenseNeedsMachineActivation(code string) bool {
+	switch strings.ToUpper(strings.TrimSpace(code)) {
+	case "NO_MACHINES", "NO_MACHINE", "MACHINE_SCOPE_REQUIRED", "FINGERPRINT_SCOPE_MISMATCH":
+		return true
+	default:
+		return false
+	}
+}
+
+func (h *Handler) validateLicenseForMachine(key string) (*license.ValidateResponse, error) {
+	fingerprint, err := h.getOrCreateMachineFingerprint()
+	if err != nil {
+		return nil, fmt.Errorf("prepare machine fingerprint: %w", err)
+	}
+
+	client := newLicenseClient(keygenAccountID, "")
+	validation, err := client.ValidateKeyWithFingerprint(key, fingerprint)
+	if err != nil {
+		return nil, err
+	}
+	if validation.Meta.Valid || !licenseNeedsMachineActivation(validation.Meta.Code) {
+		return validation, nil
+	}
+
+	client.Token = key
+	if err := client.ActivateMachine(validation.Data.ID, fingerprint); err != nil {
+		return validation, err
+	}
+
+	validation, err = client.ValidateKeyWithFingerprint(key, fingerprint)
+	if err != nil {
+		return nil, err
+	}
+	return validation, nil
+}