improve(api,pkg): set validation rules to it own type

api/services/device.go

@@ -351,7 +351,7 @@ func (s *service) UpdateDevice(ctx context.Context, tenant string, uid models.UI
 		}
 
 		v := validator.New()
-		if ok, err := v.Var(*name, "device_name"); err != nil || !ok {
+		if ok, err := v.Var(*name, validator.DeviceNameTag); err != nil || !ok {
 			return NewErrDeviceInvalid(map[string]interface{}{"name": *name}, nil)
 		}
 

pkg/validator/validator.go

@@ -14,10 +14,24 @@ type Rule struct {
 	Error   error
 }
 
+// Tag is the rule used to validate a variable or a structure's field.
+type Tag string
+
+const (
+	// RegexpTag indicates that the regexp must be valide.
+	RegexpTag = "regexp"
+	// UserNameTag contains the rule to validate the user's name.
+	UserNameTag = "username"
+	// UserPasswordTag contains the rule to validate the user's password.
+	UserPasswordTag = "password"
+	// DeviceNameTag contains the rule to validate the device's name.
+	DeviceNameTag = "device_name"
+)
+
 // Rules is a slice that contains all validation rules.
 var Rules = []Rule{
 	{
-		Tag: "regexp",
+		Tag: RegexpTag,
 		Handler: func(field validator.FieldLevel) bool {
 			_, err := regexp.Compile(field.Field().String())
 
@@ -26,25 +40,25 @@ var Rules = []Rule{
 		Error: fmt.Errorf("the regexp is invalid"),
 	},
 	{
-		Tag: "username",
+		Tag: UserNameTag,
 		Handler: func(field validator.FieldLevel) bool {
 			return regexp.MustCompile(`^([a-zA-Z0-9-_.@]){3,30}$`).MatchString(field.Field().String())
 		},
 		Error: fmt.Errorf("the username must be between 3 and 30 characters, and can only contain letters, numbers, and the following characters: -_.@"),
 	},
 	{
-		Tag: "password",
+		Tag: UserPasswordTag,
 		Handler: func(field validator.FieldLevel) bool {
 			return regexp.MustCompile(`^(.){5,30}$`).MatchString(field.Field().String())
 		},
 		Error: fmt.Errorf("the password cannot be empty and must be between 5 and 30 characters"),
 	},
 	{
-		Tag: "device_name",
+		Tag: DeviceNameTag,
 		Handler: func(field validator.FieldLevel) bool {
-			return regexp.MustCompile(`^([a-zA-Z0-9_.-] ){1,64}$`).MatchString(field.Field().String())
+			return regexp.MustCompile(`^([a-zA-Z0-9_-]){1,64}$`).MatchString(field.Field().String())
 		},
-		Error: fmt.Errorf("the device name can only contain `_`, `.` and alpha numeric characters"),
+		Error: fmt.Errorf("the device name can only contain `_`, `-` and alpha numeric characters"),
 	},
 }
 
@@ -70,8 +84,8 @@ func New() *Validator {
 }
 
 // Var validates a variable using a ShellHub validation's tags.
-func (v *Validator) Var(value, tag string) (bool, error) {
-	if err := v.Validate.Var(value, tag); err != nil {
+func (v *Validator) Var(value string, tag Tag) (bool, error) {
+	if err := v.Validate.Var(value, string(tag)); err != nil {
 		return false, fmt.Errorf("invalid variable: %w", fmt.Errorf("invalid validation on value %s using tag %s", value, tag))
 	}