feat(covenant): add covenant rules constants

pkg/covenant/name_test.go

@@ -15,6 +15,32 @@ func TestNameSizeLimits(t *testing.T) {
 	if MaxResourceSize != 512 {
 		t.Fatalf("MaxResourceSize = %d, want 512", MaxResourceSize)
 	}
+
+	if MaxCovenantSize != 585 {
+		t.Fatalf("MaxCovenantSize = %d, want 585", MaxCovenantSize)
+	}
+
+	if CovenantMaxSize != MaxCovenantSize {
+		t.Fatalf("CovenantMaxSize = %d, want %d", CovenantMaxSize, MaxCovenantSize)
+	}
+}
+
+func TestNameFlags(t *testing.T) {
+	if VerifyCovenantsNone != 0 {
+		t.Fatalf("VerifyCovenantsNone = %d, want 0", VerifyCovenantsNone)
+	}
+
+	if VerifyCovenantsHardened != 1<<0 {
+		t.Fatalf("VerifyCovenantsHardened = %d, want %d", VerifyCovenantsHardened, 1<<0)
+	}
+
+	if VerifyCovenantsLockup != 1<<1 {
+		t.Fatalf("VerifyCovenantsLockup = %d, want %d", VerifyCovenantsLockup, 1<<1)
+	}
+
+	if MandatoryVerifyCovenantFlags != VerifyCovenantsNone {
+		t.Fatalf("MandatoryVerifyCovenantFlags = %d, want %d", MandatoryVerifyCovenantFlags, VerifyCovenantsNone)
+	}
 }
 
 func TestVerifyString(t *testing.T) {

pkg/covenant/rules.go

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: EUPL-1.2
+
+package covenant
+
+// NameFlags mirrors the covenant verification flags used by the JS reference
+// rules module.
+type NameFlags uint8
+
+const (
+	// VerifyCovenantsNone disables covenant verification flags.
+	VerifyCovenantsNone NameFlags = 0
+
+	// VerifyCovenantsHardened is enabled when the covenant hardening soft fork
+	// activates.
+	VerifyCovenantsHardened NameFlags = 1 << 0
+
+	// VerifyCovenantsLockup is enabled when the ICANN lockup soft fork
+	// activates.
+	VerifyCovenantsLockup NameFlags = 1 << 1
+
+	// MandatoryVerifyCovenantFlags is the default covenant verification mask.
+	MandatoryVerifyCovenantFlags NameFlags = VerifyCovenantsNone
+
+	// MaxCovenantSize is the maximum serialized covenant size mirrored from the
+	// JS rules reference.
+	MaxCovenantSize = 1 + 32 + 1 + 4 + 2 + MaxResourceSize + 1 + 32
+
+	// CovenantMaxSize is an alias for MaxCovenantSize.
+	CovenantMaxSize = MaxCovenantSize
+)