fix: ensure users imported from LDAP have fields validated (#923)

backend/internal/dto/user_dto.go

@@ -1,6 +1,9 @@
 package dto
 
 import (
+	"errors"
+
+	"github.com/gin-gonic/gin/binding"
 	"github.com/pocket-id/pocket-id/backend/internal/utils"
 )
 
@@ -29,6 +32,17 @@ type UserCreateDto struct {
 	LdapID    string  `json:"-"`
 }
 
+func (u UserCreateDto) Validate() error {
+	e, ok := binding.Validator.Engine().(interface {
+		Struct(s any) error
+	})
+	if !ok {
+		return errors.New("validator does not implement the expected interface")
+	}
+
+	return e.Struct(u)
+}
+
 type OneTimeAccessTokenCreateDto struct {
 	UserID string             `json:"userId"`
 	TTL    utils.JSONDuration `json:"ttl" binding:"ttl"`