feat: add admin menu management crud

src/Application/TakeoutSaaS.Application/Identity/Handlers/UpdateMenuCommandHandler.cs

@@ -0,0 +1,52 @@
+using MediatR;
+using TakeoutSaaS.Application.Identity.Commands;
+using TakeoutSaaS.Application.Identity.Contracts;
+using TakeoutSaaS.Domain.Identity.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Constants;
+using TakeoutSaaS.Shared.Abstractions.Exceptions;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Application.Identity.Handlers;
+
+/// <summary>
+/// 更新菜单处理器。
+/// </summary>
+public sealed class UpdateMenuCommandHandler(
+    IMenuRepository menuRepository,
+    ITenantProvider tenantProvider)
+    : IRequestHandler<UpdateMenuCommand, MenuDefinitionDto?>
+{
+    /// <inheritdoc />
+    public async Task<MenuDefinitionDto?> Handle(UpdateMenuCommand request, CancellationToken cancellationToken)
+    {
+        // 1. 校验存在
+        var tenantId = tenantProvider.GetCurrentTenantId();
+        var entity = await menuRepository.FindByIdAsync(request.Id, tenantId, cancellationToken)
+            ?? throw new BusinessException(ErrorCodes.NotFound, "菜单不存在");
+
+        // 2. 更新字段
+        entity.ParentId = request.ParentId;
+        entity.Name = request.Name.Trim();
+        entity.Path = request.Path.Trim();
+        entity.Component = request.Component.Trim();
+        entity.Title = request.Title.Trim();
+        entity.Icon = request.Icon?.Trim();
+        entity.IsIframe = request.IsIframe;
+        entity.Link = string.IsNullOrWhiteSpace(request.Link) ? null : request.Link.Trim();
+        entity.KeepAlive = request.KeepAlive;
+        entity.SortOrder = request.SortOrder;
+        entity.RequiredPermissions = MenuMapper.JoinCodes(request.RequiredPermissions);
+        entity.MetaPermissions = MenuMapper.JoinCodes(request.MetaPermissions);
+        entity.MetaRoles = MenuMapper.JoinCodes(request.MetaRoles);
+        entity.AuthListJson = request.AuthList.Count == 0
+            ? null
+            : System.Text.Json.JsonSerializer.Serialize(request.AuthList);
+
+        // 3. 持久化
+        await menuRepository.UpdateAsync(entity, cancellationToken);
+        await menuRepository.SaveChangesAsync(cancellationToken);
+
+        // 4. 返回 DTO
+        return MenuMapper.ToDto(entity);
+    }
+}