refactor/fix: now using pgx errors for postgres error checking instead of trying to look up the error code;

feat: implemented working custom validation;
fix: authservice begin/complete registration

backend/internal/middleware/request.go

@@ -19,9 +19,12 @@ package middleware
 
 import (
 	"easywish/internal/utils/enums"
+	"easywish/internal/validation"
+	"fmt"
 	"net/http"
 
 	"github.com/gin-gonic/gin"
+	"github.com/go-playground/validator/v10"
 )
 
 type UserInfo struct {
@@ -87,6 +90,15 @@ func RequestMiddleware[T any](role enums.Role) gin.HandlerFunc {
 			return
 		}
 
+		validate := validation.NewValidator()
+
+		if err := validate.Struct(body); err != nil {
+			errorList := err.(validator.ValidationErrors)
+			c.String(http.StatusBadRequest, fmt.Sprintf("Validation error: %s", errorList))
+
+			return
+		}
+
 		request := Request[T]{
 			User: *userInfo,
 			Body: body,