Validate account_id length in google_service_account (#793)

* Add validation method for RFC1035 names

google/resource_google_service_account.go

@@ -33,9 +33,10 @@ func resourceGoogleServiceAccount() *schema.Resource {
 				Computed: true,
 			},
 			"account_id": &schema.Schema{
-				Type:     schema.TypeString,
-				Required: true,
-				ForceNew: true,
+				Type:         schema.TypeString,
+				Required:     true,
+				ForceNew:     true,
+				ValidateFunc: validateRFC1035Name(6, 30),
 			},
 			"display_name": &schema.Schema{
 				Type:     schema.TypeString,

google/resource_google_service_account_key.go

@@ -17,9 +17,10 @@ func resourceGoogleServiceAccountKey() *schema.Resource {
 		Schema: map[string]*schema.Schema{
 			// Required
 			"service_account_id": &schema.Schema{
-				Type:     schema.TypeString,
-				Required: true,
-				ForceNew: true,
+				Type:         schema.TypeString,
+				Required:     true,
+				ForceNew:     true,
+				ValidateFunc: validateRFC1035Name(6, 30),
 			},
 			// Optional
 			"key_algorithm": &schema.Schema{

google/validation.go

@@ -79,3 +79,19 @@ func validateRFC3339Time(v interface{}, k string) (warnings []string, errors []e
 	}
 	return
 }
+
+func validateRFC1035Name(min, max int) schema.SchemaValidateFunc {
+	if min < 2 || max < min {
+		return func(i interface{}, k string) (s []string, errors []error) {
+			if min < 2 {
+				errors = append(errors, fmt.Errorf("min must be at least 2. Got: %d", min))
+			}
+			if max < min {
+				errors = append(errors, fmt.Errorf("max must greater than min. Got [%d, %d]", min, max))
+			}
+			return
+		}
+	}
+
+	return validateRegexp(fmt.Sprintf(`^[a-z]([-a-z0-9]{%d,%d}[a-z0-9])$`, min-2, max-2))
+}

google/validation_test.go

@@ -74,6 +74,38 @@ func TestValidateRFC3339Time(t *testing.T) {
 	}
 }
 
+func TestValidateRFC1035Name(t *testing.T) {
+	cases := []struct {
+		TestName    string
+		Value       string
+		Min, Max    int
+		ExpectError bool
+	}{
+		{TestName: "valid", Min: 6, Max: 30, Value: "a-valid-name0"},
+		{TestName: "valid lower bound", Min: 12, Max: 30, Value: "a-valid-name"},
+		{TestName: "valid upper bound", Min: 6, Max: 12, Value: "a-valid-name"},
+		{TestName: "valid with numbers", Min: 6, Max: 30, Value: "valid000-name"},
+		{TestName: "must start with a letter", Min: 6, Max: 10, Value: "0invalid", ExpectError: true},
+		{TestName: "cannot end with a dash", Min: 6, Max: 10, Value: "invalid-", ExpectError: true},
+		{TestName: "too short", Min: 6, Max: 10, Value: "short", ExpectError: true},
+		{TestName: "too long", Min: 6, Max: 10, Value: "toolooooong", ExpectError: true},
+		{TestName: "min too small", Min: 1, Max: 10, Value: "", ExpectError: true},
+		{TestName: "min < max", Min: 6, Max: 5, Value: "", ExpectError: true},
+	}
+
+	for _, c := range cases {
+		errors := testStringValidation(StringValidationTestCase{
+			TestName:    c.TestName,
+			Value:       c.Value,
+			ExpectError: c.ExpectError,
+		}, validateRFC1035Name(c.Min, c.Max))
+
+		if len(errors) > 0 {
+			t.Errorf("%s failed; %v", c.TestName, errors)
+		}
+	}
+}
+
 type StringValidationTestCase struct {
 	TestName    string
 	Value       string