From b82265994c5f72c40f68c6b3a4960869b6a67951 Mon Sep 17 00:00:00 2001
From: physcik <mynameisgennadiy@vk.com>
Date: Mon, 4 May 2026 12:22:25 +0500
Subject: Register error handling

---
 backend/src/API/AuthenticationAPI.zig     | 36 ++++++-------------------------
 front/src/Authentication/RegisterPage.tsx | 20 ++++++++++++++---
 front/src/Models/ErrorResponce.ts         |  3 +++
 3 files changed, 26 insertions(+), 33 deletions(-)
 create mode 100644 front/src/Models/ErrorResponce.ts

diff --git a/backend/src/API/AuthenticationAPI.zig b/backend/src/API/AuthenticationAPI.zig
index 82cdb1c..ea398ba 100644
--- a/backend/src/API/AuthenticationAPI.zig
+++ b/backend/src/API/AuthenticationAPI.zig
@@ -42,7 +42,9 @@ fn register(_: *Handler.RequestData, req: *httpz.Request, res: *httpz.Response)
     db.Users.Create(&body_model) catch |err| {
         if (err == db.ResultErrors.AlreadyExists) {
             res.setStatus(.bad_request);
-            try res.json(errDesc.AlreadyExistsDescriptor, .{});
+            try res.json(errDesc.ErrorDescriptor {
+                .Message = "The user with that username already exists"
+            }, .{});
             return;
         }
         res.setStatus(.internal_server_error);
@@ -70,10 +72,7 @@ fn login(_: *Handler.RequestData, req: *httpz.Request, res: *httpz.Response) !vo
         return;
     };
 
-    const username = body.Username;
-    const pwd = body.Password;
-
-    const user = db.Users.GetByCredentials(req.arena, username, pwd) catch |err| {
+    const loginResult = loginAction(req.arena, body) catch |err| {
         if (err == db.ResultErrors.NotFound) {
             res.setStatus(.unauthorized);
             try res.json(errDesc.ErrorDescriptor {
@@ -84,30 +83,14 @@ fn login(_: *Handler.RequestData, req: *httpz.Request, res: *httpz.Response) !vo
         return err;
     };
 
-    const token = try Tokens.GenerateNewSession(res.arena, user);
-    try res.json(.{ 
-        .Token = token,
-        .User = .{
-            .Username = user.Username,
-            .Role = user.Role.ToString(),
-        },
-    } , .{});
+    try res.json(loginResult, .{});
 }
 
 /// Logs in with the given credentials
 fn loginAction(allocator: std.mem.Allocator, requetsed: model.RequestBody) !authResult {
     const username = requetsed.Username;
     const pwd = requetsed.Password;
-    const user = try db.Users.GetByCredentials(allocator, username, pwd); // catch |err| {
-        // if (err == db.ResultErrors.NotFound) {
-            // res.setStatus(.unauthorized);
-            // try res.json(errDesc.ErrorDescriptor {
-                // .Message = "Login or password is incorrect"
-            // }, .{});
-            // return;
-        // }
-        // return err;
-    // };
+    const user = try db.Users.GetByCredentials(allocator, username, pwd);
 
     const token = try Tokens.GenerateNewSession(allocator, user);
 
@@ -118,11 +101,4 @@ fn loginAction(allocator: std.mem.Allocator, requetsed: model.RequestBody) !auth
             .Role = user.Role.ToString(),
         }
     };
-    // try res.json(.{ 
-        // .Token = token,
-        // .User = .{
-            // .Username = user.Username,
-            // .Role = user.Role.ToString(),
-        // },
-    // } , .{});
 }
diff --git a/front/src/Authentication/RegisterPage.tsx b/front/src/Authentication/RegisterPage.tsx
index b30b182..5c818f6 100644
--- a/front/src/Authentication/RegisterPage.tsx
+++ b/front/src/Authentication/RegisterPage.tsx
@@ -1,10 +1,11 @@
-import axios from "axios";
+import axios, { AxiosError } from "axios";
 import { useContext, useState } from "react";
 import { useNavigate } from "react-router";
 import { BackendURL } from "../Config";
 import { Authentication, SaveState } from "./ContextProvider";
 import { GetLocalizedString } from "../Locales/Locales";
 import { LanguageContext } from "../Locales/Context";
+import { BackendError } from "../Models/ErrorResponce";
 
 const RegisterURL = `${BackendURL}/auth/register`;
 
@@ -13,6 +14,7 @@ function RegisterPage() {
 
     const [username, setUsername] = useState<string>("");
     const [passw, setPassw] = useState<string>("");
+    const [errMessage, setErrorMessage] = useState<string>("");
     const navigate = useNavigate();
 
     function SetAuthState(newAuthState: Authentication | null) {
@@ -37,13 +39,17 @@ function RegisterPage() {
                     SetAuthState(data);
                     navigate("/");
                     window.location.reload();
+                }, (err) => {
+                    setErrorMessage(err);
+                    console.log(err);
                 });
             }}> { GetLocalizedString("Register", lang) } </button>
+            <p> { errMessage } </p> 
         </div>
     );
 }
 
-async function Register(username: string, passw: string, onSuccess: (data: Authentication) => void) {
+async function Register(username: string, passw: string, onSuccess: (data: Authentication) => void, onError: (message: string) => void) {
     await axios.post<Authentication>(
         RegisterURL, {
             Username: username,
@@ -52,7 +58,15 @@ async function Register(username: string, passw: string, onSuccess: (data: Authe
     ).then(resp => {
         onSuccess(resp.data);
     }).catch(err => {
-        console.log(`Failed to send a login responce: ${err}`);
+        if (axios.isAxiosError(err)) {
+            const parsedErr = err as AxiosError<BackendError>;
+            if (parsedErr.response) {
+                console.log(parsedErr.response);
+                onError(parsedErr.response.data.Message);
+                return
+            }
+        }
+        return "An unexpected error occured"
     });
 }
 
diff --git a/front/src/Models/ErrorResponce.ts b/front/src/Models/ErrorResponce.ts
new file mode 100644
index 0000000..bc0c552
--- /dev/null
+++ b/front/src/Models/ErrorResponce.ts
@@ -0,0 +1,3 @@
+export type BackendError = {
+    Message: string,
+};
-- 
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