aws: Add validation for ECR repository name

builtin/providers/aws/validators.go

@@ -112,3 +112,25 @@ func validateElbName(v interface{}, k string) (ws []string, errors []error) {
 	return
 
 }
+
+func validateEcrRepositoryName(v interface{}, k string) (ws []string, errors []error) {
+	value := v.(string)
+	if len(value) < 2 {
+		errors = append(errors, fmt.Errorf(
+			"%q must be at least 2 characters long: %q", k, value))
+	}
+	if len(value) > 256 {
+		errors = append(errors, fmt.Errorf(
+			"%q cannot be longer than 256 characters: %q", k, value))
+	}
+
+	// http://docs.aws.amazon.com/AmazonECR/latest/APIReference/API_CreateRepository.html
+	pattern := `^(?:[a-z0-9]+(?:[._-][a-z0-9]+)*/)*[a-z0-9]+(?:[._-][a-z0-9]+)*$`
+	if !regexp.MustCompile(pattern).MatchString(value) {
+		errors = append(errors, fmt.Errorf(
+			"%q doesn't comply with restrictions (%q): %q",
+			k, pattern, value))
+	}
+
+	return
+}

builtin/providers/aws/validators_test.go

@@ -0,0 +1,45 @@
+package aws
+
+import (
+	"testing"
+)
+
+func TestValidateEcrRepositoryName(t *testing.T) {
+	validNames := []string{
+		"nginx-web-app",
+		"project-a/nginx-web-app",
+		"domain.ltd/nginx-web-app",
+		"3chosome-thing.com/01different-pattern",
+		"0123456789/999999999",
+		"double/forward/slash",
+		"000000000000000",
+	}
+	for _, v := range validNames {
+		_, errors := validateEcrRepositoryName(v, "name")
+		if len(errors) != 0 {
+			t.Fatalf("%q should be a valid ECR repository name: %q", v, errors)
+		}
+	}
+
+	invalidNames := []string{
+		// length > 256
+		"3cho_some-thing.com/01different.-_pattern01different.-_pattern01diff" +
+			"erent.-_pattern01different.-_pattern01different.-_pattern01different" +
+			".-_pattern01different.-_pattern01different.-_pattern01different.-_pa" +
+			"ttern01different.-_pattern01different.-_pattern234567",
+		// length < 2
+		"i",
+		"special@character",
+		"different+special=character",
+		"double//slash",
+		"double..dot",
+		"/slash-at-the-beginning",
+		"slash-at-the-end/",
+	}
+	for _, v := range invalidNames {
+		_, errors := validateEcrRepositoryName(v, "name")
+		if len(errors) == 0 {
+			t.Fatalf("%q should be an invalid ECR repository name", v)
+		}
+	}
+}