verify the username, email and nickname are valid when registering via OAuth 2.0

pkg/validators/nickname.go

@@ -0,0 +1,18 @@
+package validators
+
+import (
+	"github.com/go-playground/validator/v10"
+
+	"github.com/mayswind/ezbookkeeping/pkg/utils"
+)
+
+// ValidNickname returns whether the given nick name is valid
+func ValidNickname(fl validator.FieldLevel) bool {
+	if value, ok := fl.Field().Interface().(string); ok {
+		if utils.IsValidNickName(value) {
+			return true
+		}
+	}
+
+	return false
+}