Initial commit

checker/provider.go

@@ -0,0 +1,48 @@
+package checker
+
+import (
+	"fmt"
+
+	sdk "git.happydns.org/checker-sdk-go/checker"
+)
+
+func Provider() sdk.ObservationProvider {
+	return &delegationProvider{}
+}
+
+type delegationProvider struct{}
+
+func (p *delegationProvider) Key() sdk.ObservationKey {
+	return ObservationKeyDelegation
+}
+
+// ValidateOptions runs once per provider so each rule doesn't re-check.
+func (p *delegationProvider) ValidateOptions(opts sdk.CheckerOptions) error {
+	if v, ok := opts["minNameServers"]; ok {
+		var f float64
+		switch n := v.(type) {
+		case float64:
+			f = n
+		case float32:
+			f = float64(n)
+		case int:
+			f = float64(n)
+		case int32:
+			f = float64(n)
+		case int64:
+			f = float64(n)
+		case uint:
+			f = float64(n)
+		case uint32:
+			f = float64(n)
+		case uint64:
+			f = float64(n)
+		default:
+			return fmt.Errorf("minNameServers must be a number")
+		}
+		if f < 1 {
+			return fmt.Errorf("minNameServers must be >= 1")
+		}
+	}
+	return nil
+}