update:重复创建也返回成功

创建时可直接返回二维码

Domain/AggregateModel/LinkAggregate/Link.cs

@@ -56,7 +56,7 @@ namespace Domain.AggregateModel.LinkAggregate
                 var result = md5.ComputeHash(Encoding.UTF8.GetBytes(FullUrl));
                 var res = new[] { BitConverter.ToInt64(result, 0) ,BitConverter.ToInt64(result,8)};
                 //任意取其中一条即可
-                code = res[new Random().Next(0,1)].ToBase62();
+                code = res[0].ToBase62();
             }
             ShortCode = code;
         }

QRCodeService/Application/Commands/CreateLinkCommandHandler.cs

@@ -2,6 +2,7 @@
 using Domain.AggregateModel.LinkAggregate;
 using Domain.Exceptions;
 using MediatR;
+using Microsoft.Extensions.Logging;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -13,16 +14,19 @@ namespace QRCodeService.Application.Commands
 {
     public class CreateLinkCommandHandler : IRequestHandler<CreateLinkCommand, Link>
     {
+
+        readonly ILogger<CreateLinkCommandHandler> logger;
         readonly IAppRepository appRepository;
         readonly ILinkRepository linkRepository;
 
-        public CreateLinkCommandHandler(ILinkRepository linkRepository, IAppRepository appRepository)
+        public CreateLinkCommandHandler(ILinkRepository linkRepository, IAppRepository appRepository, ILogger<CreateLinkCommandHandler> logger)
         {
             this.linkRepository = linkRepository;
             this.appRepository = appRepository;
+            this.logger = logger;
         }
 
-         async Task<Link> IRequestHandler<CreateLinkCommand, Link>.Handle(CreateLinkCommand request, CancellationToken cancellationToken)
+        async Task<Link> IRequestHandler<CreateLinkCommand, Link>.Handle(CreateLinkCommand request, CancellationToken cancellationToken)
         {
             var app =  await appRepository.GetAsync(request.AppId);
             if (app == null)
@@ -33,7 +37,8 @@ namespace QRCodeService.Application.Commands
             var dbLink = await linkRepository.GetAsync(link.ShortCode);
             if (dbLink != null)
             {
-                throw new DomainException("url has been registed");
+                logger.LogDebug("use exist link");
+                return dbLink;
             }
             link = linkRepository.Add(link);
             await linkRepository.UnitOfWork.SaveEntitiesAsync();

QRCodeService/Controllers/Api/LinkController.cs

@@ -35,7 +35,7 @@ namespace QRCodeService.Controllers.Api
         }
         [Route("i/{shortCode}/")]
         [HttpGet]
-        public async  Task<IActionResult> GetQrCode(string shortCode,int img=0)
+        public async  Task<IActionResult> GetQrCodeImage(string shortCode)
         {
             var link = await linkQueries.GetLinkAsync(shortCode);
             if (link == null)
@@ -51,7 +51,11 @@ namespace QRCodeService.Controllers.Api
                 return File(stream.ToArray(), "image/png");
             }
         }
-
+        /// <summary>
+        /// 创建二维码 如果请求头的Accept类型是image/png 则会返回二维码图片 否则返回二维码地址
+        /// </summary>
+        /// <param name="input"></param>
+        /// <returns></returns>
         [CheckSign]
         [HttpPost]
         public async Task<IActionResult> Create(CreateLinkModel input)
@@ -62,7 +66,19 @@ namespace QRCodeService.Controllers.Api
             {
                 return BadRequest();
             }
-            return Created($"{option.Value.BaseUrl}r/{link.ShortCode}",link.ShortCode);
+            var accept = Request.Headers["Accept"];
+            if(accept == "image/png")
+            {
+                var qrCodeGenerator = new QRCodeGenerator();
+                var data = qrCodeGenerator.CreateQrCode($"{option.Value.BaseUrl}r/{link.ShortCode}", QRCodeGenerator.ECCLevel.Q);
+                var qrCode = new QRCode(data);
+                using (var stream = new MemoryStream())
+                {
+                    qrCode.GetGraphic(10, Color.Black, Color.White, null, 15, 6, false).Save(stream, System.Drawing.Imaging.ImageFormat.Png);
+                    return File(stream.ToArray(), "image/png");
+                }
+            }
+            return Ok($"{option.Value.BaseUrl}r/{link.ShortCode}");
         }
     }
 }