Initial commit

checker/rules_simple.go

@@ -0,0 +1,39 @@
+package checker
+
+import (
+	"context"
+
+	sdk "git.happydns.org/checker-sdk-go/checker"
+)
+
+// simpleConcernRule is the common shape for "load SMTPData, derive the
+// issues, keep only those whose Code matches one of `codes`, and emit
+// either the matching states or a single pass state".
+type simpleConcernRule struct {
+	name        string
+	description string
+	codes       []string
+	passCode    string
+	passMessage string
+}
+
+func (r *simpleConcernRule) Name() string        { return r.name }
+func (r *simpleConcernRule) Description() string { return r.description }
+
+func (r *simpleConcernRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
+	data, errSt := loadSMTPData(ctx, obs)
+	if errSt != nil {
+		return []sdk.CheckState{*errSt}
+	}
+	// Null-MX declares the domain does not accept mail; every other rule
+	// becomes vacuous. Return "not tested" so those lines do not count as
+	// a pass or fail in the aggregator.
+	if data.MX.NullMX {
+		return []sdk.CheckState{notTestedState(r.name+".skipped", "Skipped: domain declares a null MX (refuses mail).")}
+	}
+	issues := issuesByCodes(data, r.codes...)
+	if len(issues) == 0 {
+		return []sdk.CheckState{passState(r.passCode, r.passMessage)}
+	}
+	return statesFromIssues(issues)
+}