Show server errors

Pages/UserListPanel.razor.cs

@@ -1,7 +1,9 @@
-using AdminPanel.Models;
+using System.Text;
+using AdminPanel.Models;
 using AdminPanel.Services;
 using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Web;
+using Microsoft.Extensions.Primitives;
 using MudBlazor;
 
 namespace AdminPanel.Pages
@@ -31,7 +33,8 @@ namespace AdminPanel.Pages
         private async Task<GridData<User>> LoadUsersFromServer(GridState<User> state)
         {
             Logger.LogDebug($"Loading users from server, state = {state} searchString = {SearchString}");
-            var (count, users) = await Service.ListUsers((uint)(state.Page * state.PageSize), (uint)state.PageSize, SearchString);
+            var (count, users) =
+                await Service.ListUsers((uint)(state.Page * state.PageSize), (uint)state.PageSize, SearchString);
             return new GridData<User>
             {
                 TotalItems = (int)count,
@@ -47,10 +50,9 @@ namespace AdminPanel.Pages
             {
                 await Service.UpdateUser(user);
             }
-            catch (Exception)
+            catch (ServiceException err)
             {
-                Snackbar.Add(
-                    "Server responded with errors, your given input may be incorrect.\nIf you entered a new email, verify that the email is not used by another member.");
+                ShowErrors(err);
             }
         }
 
@@ -66,9 +68,25 @@ namespace AdminPanel.Pages
                 Logger.LogDebug($"Added user : {user}");
                 await Grid.ReloadServerData();
             }
-            catch (Exception)
+            catch (ServiceException err)
             {
-                Snackbar.Add("Server responded with errors, your given input may be incorrect.");
+                ShowErrors(err);
+            }
+        }
+
+        private void ShowErrors(ServiceException e)
+        {
+            foreach (var erronedArgument in e.ArgumentMessages)
+            {
+                var sb = new StringBuilder(erronedArgument.Key);
+                sb.Append(" :");
+
+                foreach (var message in erronedArgument.Value)
+                {
+                    sb.Append("\n\t-");
+                    sb.Append(message);
+                }
+                Snackbar.Add(sb.ToString());
             }
         }
 
@@ -81,24 +99,23 @@ namespace AdminPanel.Pages
                 await Service.RemoveUsers(users);
                 await Grid.ReloadServerData();
             }
-            catch (Exception)
+            catch (ServiceException err)
             {
-                Snackbar.Add("Server responded with errors");
+                ShowErrors(err);
             }
         }
 
         private Func<string, string?> VerifyLength(uint min, uint max)
         {
-            return s => s.Length >= min && s.Length <= max ? null : $"length is incorrect (must be between {min} and {max})";
+            return s => s.Length >= min && s.Length <= max
+                ? null
+                : $"length is incorrect (must be between {min} and {max})";
         }
 
         private void ValidateSearch(KeyboardEventArgs e)
         {
-            if (e.Key == "Enter")
-            {
-                Grid.ReloadServerData();
-                Logger.LogDebug($"Searching for {SearchString}");
-            }
+            Grid.ReloadServerData();
+            Logger.LogDebug($"Searching for {SearchString}");
         }
     }
 }

Program.cs

@@ -12,7 +12,7 @@ builder.RootComponents.Add<HeadOutlet>("head::after");
 builder.Services
     .AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
 
-builder.Logging.SetMinimumLevel(LogLevel.Debug);
+// builder.Logging.SetMinimumLevel(LogLevel.Debug);
 
 var client = new HttpClient
 {

Services/HttpUsersService.cs

@@ -1,3 +1,5 @@
+using System.Diagnostics;
+using System.Net;
 using System.Net.Http.Json;
 using AdminPanel.Models;
 
@@ -12,30 +14,54 @@ public class HttpUsersService : IUsersService
         this.Client = client;
     }
 
-    private record ListUsersResponse(List<User> Users, uint TotalCount);
+    private record ServerErrorMessageDto(string? Field, string? Error, string Message);
+
+    private async Task EnsureResponseIsOk(HttpResponseMessage response)
+    {
+
+        if (response.StatusCode == HttpStatusCode.OK)
+        {
+            return;
+        }
+        
+        var content = await response.Content.ReadFromJsonAsync<ServerErrorMessageDto[]>();
+        var messages = content!
+            .GroupBy(e => e.Field ?? e.Error!)
+            .ToDictionary(
+                g => g.Key,
+                g => g.ToList().ConvertAll(e => e.Message)
+            );
+
+        throw new ServiceException("Server refused request", messages);
+    }
+
+    private record ListUsersResponseDto(List<User> Users, uint TotalCount);
 
     public async Task<(uint, List<User>)> ListUsers(uint from, uint len, string? searchString = null)
     {
-        var httpResponse = await Client.GetAsync($"/api/admin/list-users?start={from}&n={len}&search={searchString ?? ""}");
-        httpResponse.EnsureSuccessStatusCode();
+        var httpResponse =
+            await Client.GetAsync($"/api/admin/list-users?start={from}&n={len}&search={searchString ?? ""}");
+        await EnsureResponseIsOk(httpResponse);
 
-        var response = await httpResponse.Content.ReadFromJsonAsync<ListUsersResponse>()
-               ?? throw new Exception("Received non-parseable json from server");
+        var response = await httpResponse.Content.ReadFromJsonAsync<ListUsersResponseDto>()
+                       ?? throw new Exception("Received non-parseable json from server");
 
         return (response.TotalCount, response.Users);
     }
 
-    private record AddUserRequest(string Username, string Email, string Password, bool IsAdmin);
+    private record AddUserRequestDto(string Username, string Email, string Password, bool IsAdmin);
 
-    private record AddUserResponse(uint Id);
+    private record AddUserResponseDto(uint Id);
 
     public async Task<User> AddUser(string username, string email, string password, bool isAdmin)
     {
-        var httpResponse = await Client.PostAsJsonAsync("/api/admin/user/add", new AddUserRequest(username, email, password, isAdmin));
-        httpResponse.EnsureSuccessStatusCode();
+        var httpResponse = await Client.PostAsJsonAsync("/api/admin/user/add",
+            new AddUserRequestDto(username, email, password, isAdmin));
 
-        var response = await httpResponse.Content.ReadFromJsonAsync<AddUserResponse>()
-            ?? throw new Exception("Received non-parseable json from server");
+        await EnsureResponseIsOk(httpResponse);
+
+        var response = await httpResponse.Content.ReadFromJsonAsync<AddUserResponseDto>()
+                       ?? throw new Exception("Received non-parseable json from server");
 
         return new User
         {
@@ -46,19 +72,22 @@ public class HttpUsersService : IUsersService
         };
     }
 
-    private record RemoveUsersRequest(uint[] Identifiers);
+    private record RemoveUsersRequestDto(uint[] Identifiers);
 
     public async Task RemoveUsers(IEnumerable<uint> userIds)
     {
-        var httpResponse = await Client.PostAsJsonAsync("/api/admin/user/remove-all", new RemoveUsersRequest(userIds.ToArray()));
-        httpResponse.EnsureSuccessStatusCode();
+        var httpResponse =
+            await Client.PostAsJsonAsync("/api/admin/user/remove-all", new RemoveUsersRequestDto(userIds.ToArray()));
+        
+        await EnsureResponseIsOk(httpResponse);
     }
 
-    private record UpdateUserRequest(string Email, string Username, bool IsAdmin);
+    private record UpdateUserRequestDto(string Email, string Username, bool IsAdmin);
 
     public async Task UpdateUser(User user)
     {
-        var httpResponse = await Client.PostAsJsonAsync($"/api/admin/user/{user.Id}/update", new UpdateUserRequest(user.Email, user.Name, user.IsAdmin));
-        httpResponse.EnsureSuccessStatusCode();
+        var httpResponse = await Client.PostAsJsonAsync($"/api/admin/user/{user.Id}/update",
+            new UpdateUserRequestDto(user.Email, user.Name, user.IsAdmin));
+        await EnsureResponseIsOk(httpResponse);
     }
 }

Services/ServiceException.cs

@@ -0,0 +1,18 @@
+namespace AdminPanel.Services;
+
+class ServiceException : Exception
+{
+    public Dictionary<string, List<string>> ArgumentMessages { get; init; }
+
+    
+    
+    public ServiceException(string? message, Dictionary<string, List<string>> arguments) : base(message)
+    {
+        ArgumentMessages = arguments;
+    }
+
+    public ServiceException(string? message, Dictionary<string, List<string>> arguments, Exception? innerException) : base(message, innerException)
+    {
+        ArgumentMessages = arguments;
+    }
+}