Abp小试牛刀之 图片上传

/// <summary>
       /// 上传预览， 返回待上传的图片id，Content-Type：multipart/form-data
       /// </summary>
       /// <returns></returns>
       [Consumes("multipart/form-data")]
       [Route("upload/preview")]
       [ProducesResponseType(typeof(Guid),200)]
       [HttpPost]
       public async Task<Guid> UploadPicPreviewAsync(IFormFile uploadedFile)
       {
           var formFileName = uploadedFile.FileName;
           if (!new[] { ".png", ".jpg", ".bmp" }.Any((item) => formFileName.EndsWith(item)))
           {
               throw new AbpValidationException("您上传的文件格式必须为png、jpg、bmp中的一种");
           }
           byte[] bytes;
           using (var bodyStream = uploadedFile.OpenReadStream())
           {
               using (var m = new MemoryStream())
               {
                   await bodyStream.CopyToAsync(m);
                   bytes = m.ToArray();
               }
           }
           string base64 = Convert.ToBase64String(bytes);
           var bgId = Guid.NewGuid();
           _cache.Set($"{CurrentUser.TenantId}:bg:{bgId}", base64, new DistributedCacheEntryOptions { SlidingExpiration = new TimeSpan(1, 0, 0) });
           return bgId;
       }
       /// <summary>
       /// 保存图片，要使用到前置API的预览图片id
       /// </summary>
       /// <param name="createPictureInput"></param>
       /// <returns></returns>
       [Route("upload/")]
       [HttpPost]
       public async Task<bool> UploadPicAsync([FromBody] CreatePictureInput createPictureInput)
       {
           var based64 = await _cache.GetAsync($"{CurrentUser.TenantId}:bg:{createPictureInput.PreviewPicId}");
           if (string.IsNullOrEmpty(based64))
               throw  new AbpException("Cache Hotmap Picture do not find");
           var model = ObjectMapper.Map<CreatePictureInput, Picture>(createPictureInput);
           model.ProfileId = CurrentUser.TenantId;
           model.BlobStorage = Convert.FromBase64String(based64);
           return await _pictures.InsertAsync(model)!= null;
       }

upstream backend {
    server backend1.example.com;
    server backend2.example.com;
    sticky cookie srv_id expires=1h domain=.example.com path=/;
}