feat: 角色模板改为数据库管理支持前端自定义

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

@@ -0,0 +1,52 @@
+using System;
+using System.Linq;
+using MediatR;
+using TakeoutSaaS.Application.Identity.Commands;
+using TakeoutSaaS.Application.Identity.Contracts;
+using TakeoutSaaS.Domain.Identity.Entities;
+using TakeoutSaaS.Domain.Identity.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Constants;
+using TakeoutSaaS.Shared.Abstractions.Exceptions;
+
+namespace TakeoutSaaS.Application.Identity.Handlers;
+
+/// <summary>
+/// 创建角色模板处理器。
+/// </summary>
+public sealed class CreateRoleTemplateCommandHandler(IRoleTemplateRepository roleTemplateRepository)
+    : IRequestHandler<CreateRoleTemplateCommand, RoleTemplateDto>
+{
+    /// <inheritdoc />
+    public async Task<RoleTemplateDto> Handle(CreateRoleTemplateCommand request, CancellationToken cancellationToken)
+    {
+        if (string.IsNullOrWhiteSpace(request.TemplateCode) || string.IsNullOrWhiteSpace(request.Name))
+        {
+            throw new BusinessException(ErrorCodes.BadRequest, "模板编码与名称不能为空");
+        }
+
+        var existing = await roleTemplateRepository.FindByCodeAsync(request.TemplateCode, cancellationToken);
+        if (existing != null)
+        {
+            throw new BusinessException(ErrorCodes.Conflict, $"模板编码 {request.TemplateCode} 已存在");
+        }
+
+        var template = new RoleTemplate
+        {
+            TemplateCode = request.TemplateCode.Trim(),
+            Name = request.Name.Trim(),
+            Description = request.Description,
+            IsActive = request.IsActive
+        };
+
+        var permissions = request.PermissionCodes
+            .Where(code => !string.IsNullOrWhiteSpace(code))
+            .Select(code => code.Trim())
+            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .ToArray();
+
+        await roleTemplateRepository.AddAsync(template, permissions, cancellationToken);
+        await roleTemplateRepository.SaveChangesAsync(cancellationToken);
+
+        return TemplateMapper.ToDto(template, permissions);
+    }
+}