添加命令数据验证和其他杂项修改

QRCodeService/Application/Commands/CreateLinkCommandHandler.cs

@@ -1,4 +1,7 @@
-using MediatR;
+using Domain.AggregateModel.AppAggregate;
+using Domain.AggregateModel.LinkAggregate;
+using Domain.Exceptions;
+using MediatR;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -8,11 +11,33 @@ using System.Threading.Tasks;
 
 namespace QRCodeService.Application.Commands
 {
-    public class CreateLinkCommandHandler : IRequestHandler<CreateLinkCommand, bool>
+    public class CreateLinkCommandHandler : IRequestHandler<CreateLinkCommand, Link>
     {
-        public Task<bool> Handle(CreateLinkCommand request, CancellationToken cancellationToken)
+        readonly IAppRepository appRepository;
+        readonly ILinkRepository linkRepository;
+
+        public CreateLinkCommandHandler(ILinkRepository linkRepository, IAppRepository appRepository)
         {
-            throw new NotImplementedException();
+            this.linkRepository = linkRepository;
+            this.appRepository = appRepository;
+        }
+
+         async Task<Link> IRequestHandler<CreateLinkCommand, Link>.Handle(CreateLinkCommand request, CancellationToken cancellationToken)
+        {
+            var app =  await appRepository.GetAsync(request.AppId);
+            if (app == null)
+            {
+                throw new DomainException("app not found");
+            }
+            var link = new Link(app.BaseUrl, request.SuffixUrl, request.AppId);
+            var dbLink = await linkRepository.GetAsync(link.ShortCode);
+            if (dbLink != null)
+            {
+                throw new DomainException("url has been registed");
+            }
+            link = linkRepository.Add(link);
+            await linkRepository.UnitOfWork.SaveEntitiesAsync();
+            return link;
         }
     }
 }