#11: implement MTA-STS, TLS-RPT & Autoconfig HTTP services

services/protocols/internal/domain/valueobject/mta_sts_policy.go

@@ -0,0 +1,44 @@
+package valueobject
+
+import (
+	"fmt"
+	"strings"
+)
+
+type MtaStsMode string
+
+const (
+	MtaStsModeTesting MtaStsMode = "testing"
+	MtaStsModeEnforce MtaStsMode = "enforce"
+	MtaStsModeNone    MtaStsMode = "none"
+)
+
+type MtaStsPolicy struct {
+	Version string
+	Mode    MtaStsMode
+	MX      []string
+	MaxAge  int
+}
+
+func NewMtaStsPolicy(mode MtaStsMode, mx []string, maxAgeSeconds int) MtaStsPolicy {
+	if maxAgeSeconds <= 0 {
+		maxAgeSeconds = 604800 // default 7 days
+	}
+	return MtaStsPolicy{
+		Version: "STSv1",
+		Mode:    mode,
+		MX:      mx,
+		MaxAge:  maxAgeSeconds,
+	}
+}
+
+func (p MtaStsPolicy) Format() string {
+	var sb strings.Builder
+	sb.WriteString(fmt.Sprintf("version: %s\r\n", p.Version))
+	sb.WriteString(fmt.Sprintf("mode: %s\r\n", p.Mode))
+	for _, mxHost := range p.MX {
+		sb.WriteString(fmt.Sprintf("mx: %s\r\n", mxHost))
+	}
+	sb.WriteString(fmt.Sprintf("max_age: %d\r\n", p.MaxAge))
+	return sb.String()
+}