Add dns-952-identifier validation to service ids.

cmd/integration/integration.go

@@ -166,7 +166,7 @@ func runAtomicPutTest(c *client.Client) {
 	var svc api.Service
 	err := c.Post().Path("services").Body(
 		api.Service{
-			JSONBase: api.JSONBase{ID: "atomicService", APIVersion: "v1beta1"},
+			JSONBase: api.JSONBase{ID: "atomicservice", APIVersion: "v1beta1"},
 			Port:     12345,
 			Labels: map[string]string{
 				"name": "atomicService",

pkg/api/validation.go

@@ -302,6 +302,8 @@ func ValidateService(service *Service) []error {
 	allErrs := errorList{}
 	if service.ID == "" {
 		allErrs.Append(makeInvalidError("Service.ID", service.ID))
+	} else if !util.IsDNS952Label(service.ID) {
+		allErrs.Append(makeInvalidError("Service.ID", service.ID))
 	}
 	if labels.Set(service.Selector).AsSelector().Empty() {
 		allErrs.Append(makeInvalidError("Service.Selector", service.Selector))

pkg/util/validation.go

@@ -58,3 +58,13 @@ func IsCIdentifier(value string) bool {
 func IsValidPortNum(port int) bool {
 	return 0 < port && port < 65536
 }
+
+const dns952IdentifierFmt string = "[a-z]([-a-z0-9]*[a-z0-9])?"
+
+var dns952Regexp = regexp.MustCompile("^" + dns952IdentifierFmt + "$")
+
+const dns952MaxLength = 24
+
+func IsDNS952Label(value string) bool {
+	return len(value) <= dns952MaxLength && dns952Regexp.MatchString(value)
+}

pkg/util/validation_test.go

@@ -100,6 +100,7 @@ func TestIsCIdentifier(t *testing.T) {
 		"-", "a-", "-a", "1-", "-1", "1_", "1_2",
 		".", "a.", ".a", "a.b", "1.", ".1", "1.2",
 		" ", "a ", " a", "a b", "1 ", " 1", "1 2",
+		"#a#",
 	}
 	for _, val := range badValues {
 		if IsCIdentifier(val) {
@@ -123,3 +124,26 @@ func TestIsValidPortNum(t *testing.T) {
 		}
 	}
 }
+
+func TestIsDNS952(t *testing.T) {
+	goodValues := []string{
+		"a", "ab", "abc", "a1", "a-b", "a-1", "a-1-2-b", "abc-123",
+	}
+	for _, val := range goodValues {
+		if !IsDNS952Label(val) {
+			t.Errorf("expected true for '%s'", val)
+		}
+	}
+
+	badValues := []string{
+		"", "1", "123", "1a",
+		"-", "a-", "-a", "1-", "-1", "1-2",
+		" ", "a ", " a", "a b", "1 ", " 1", "1 2",
+		"A", "AB", "AbC", "A1", "A-B", "A-1", "A-1-2-B",
+	}
+	for _, val := range badValues {
+		if IsDNS952Label(val) {
+			t.Errorf("expected false for '%s'", val)
+		}
+	}
+}