Initial commit

checker/rule.go

@@ -0,0 +1,67 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// 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.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package checker
+
+import (
+	"context"
+	"fmt"
+
+	sdk "git.happydns.org/checker-sdk-go/checker"
+)
+
+// Rule returns the delegation check rule.
+func Rule() sdk.CheckRule {
+	return &delegationRule{}
+}
+
+type delegationRule struct{}
+
+func (r *delegationRule) Name() string { return "delegation_check" }
+
+func (r *delegationRule) Description() string {
+	return "Verifies a DNS delegation against its parent zone and the delegated name servers"
+}
+
+func (r *delegationRule) ValidateOptions(opts sdk.CheckerOptions) error {
+	if v, ok := opts["minNameServers"]; ok {
+		f, ok := v.(float64)
+		if !ok {
+			return fmt.Errorf("minNameServers must be a number")
+		}
+		if f < 1 {
+			return fmt.Errorf("minNameServers must be >= 1")
+		}
+	}
+	return nil
+}
+
+func (r *delegationRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, opts sdk.CheckerOptions) sdk.CheckState {
+	var data DelegationData
+	if err := obs.Get(ctx, ObservationKeyDelegation, &data); err != nil {
+		return sdk.CheckState{
+			Status:  sdk.StatusError,
+			Message: fmt.Sprintf("Failed to get delegation data: %v", err),
+			Code:    "delegation_error",
+		}
+	}
+	return Evaluate(&data)
+}