Initial cloud-services repo - gateway service + pkg modules

pkg/validator/validator.go

@@ -0,0 +1,91 @@
+package validator
+
+import (
+	"net/url"
+	"strings"
+	"sync"
+
+	"github.com/go-playground/validator/v10"
+)
+
+const TokenRule = "max=2048"
+const URLRule = "url,max=32768"
+const VersionRule = "max=255"
+
+var instance *validator.Validate
+var once sync.Once
+
+// GetValidator creates a singleton validator instance
+func GetValidator() *validator.Validate {
+	once.Do(func() {
+		instance = validator.New()
+		instance.RegisterValidation("sqlorder", validateSqlOrderBy)
+		instance.RegisterValidation("can_id", validateCANID)
+		instance.RegisterValidation("fleet", validateFleetName)
+		instance.RegisterValidation("serial", validateCertSerial)
+		instance.RegisterValidation("vin", validateVIN)
+		instance.RegisterValidation("vins", validateVINs)
+		instance.RegisterValidation("vinsuffix", validateVINSuffix)
+		instance.RegisterValidation("vincheck", validateVinCheckDigit)
+		instance.RegisterValidation("email", validateEmail)
+		instance.RegisterValidation("ecu", validateECU)
+		instance.RegisterValidation("ISO8601date", IsISO8601Date)
+		instance.RegisterValidation("yyyymmdddate", IsDateYYYYMMDD)
+		instance.RegisterValidation("sums_version", validateSUMSVersion)
+		instance.RegisterValidation("user_consent_name", validateUserConsentName)
+		instance.RegisterValidation("iccid", validateICCID)
+	})
+	return instance
+}
+
+// ValidateStruct validates declared fields within a struct
+// variables must have "validate" tag declared within struct
+func ValidateStruct(s interface{}) error {
+	return GetValidator().Struct(s)
+}
+
+func ValidateField(field interface{}, tag string) error {
+	return GetValidator().Var(field, tag)
+}
+
+func ValidateIDField(v int64) error {
+	if v == 0 {
+		return &FieldError{
+			ErrorMsg: "id required",
+		}
+	}
+
+	return nil
+}
+
+func ValidateURL(u string) bool {
+	_, err := url.ParseRequestURI(u)
+
+	return err == nil
+}
+
+func ValidateNonRequired(s interface{}) error {
+	err := GetValidator().Struct(s)
+	return getNonRequired(err)
+}
+
+func getNonRequired(err error) error {
+	if err == nil {
+		return nil
+	}
+
+	valerrs, ok := err.(validator.ValidationErrors)
+	if ok {
+		nonrequired := make(validator.ValidationErrors, 0)
+		for _, val := range valerrs {
+			if !strings.Contains(val.Tag(), "required") {
+				nonrequired = append(nonrequired, val)
+			}
+		}
+		if len(nonrequired) > 0 {
+			return nonrequired
+		}
+	}
+
+	return nil
+}