【新增】图片的【裁剪上传】模式增加上传文件流大小验证机制。限制用户裁剪过大图片。

CoreCms.Net.Utility/Helper/CommonHelper.cs

@@ -681,5 +681,57 @@ namespace CoreCms.Net.Utility.Helper
         }
         #endregion
 
+        /// <summary>
+        ///  精确计算base64字符串文件大小（单位：B）
+        ///  param base64String
+        ///  return double 字节大小
+        /// </summary>
+        /// <param name="base64String"></param>
+        /// <returns></returns>
+        public static double Base64FileSize(String base64String)
+        {
+            //检测是否含有base64,文件头)
+            if (base64String.LastIndexOf(",", StringComparison.Ordinal) > -1)
+            {
+                base64String = base64String[(base64String.LastIndexOf(",", StringComparison.Ordinal) + 1)..];
+            }
+            //获取base64字符串长度(不含data:audio/wav;base64,文件头)
+            var size0 = base64String.Length;
+            if (size0 <= 10) return size0 - ((double)size0 / 8) * 2;
+            //获取字符串的尾巴的最后10个字符，用于判断尾巴是否有等号，正常生成的base64文件'等号'不会超过4个
+            var tail = base64String[(size0 - 10)..];
+            //找到等号，把等号也去掉,(等号其实是空的意思,不能算在文件大小里面)
+            int equalIndex = tail.IndexOf("=", StringComparison.Ordinal);
+            if (equalIndex > 0)
+            {
+                size0 = size0 - (10 - equalIndex);
+            }
+            //计算后得到的文件流大小，单位为字节
+            return size0 - ((double)size0 / 8) * 2;
+        }
+
+        /// <summary>
+        /// 判断文件大小
+        /// </summary>
+        /// <param name="base64"></param>
+        /// <param name="size"></param>
+        /// <param name="unit"></param>
+        /// <returns></returns>
+        public static bool CheckBase64Size(string base64, int size, string unit = "M")
+        {
+            // 上传文件的大小, 单位为字节.
+            var len = Base64FileSize(base64);
+            // 准备接收换算后文件大小的容器
+            double fileSize = unit.ToUpperInvariant() switch
+            {
+                "B" => len,
+                "K" => (double)len / 1024,
+                "M" => (double)len / 1048576,
+                "G" => (double)len / 1073741824,
+                _ => 0
+            };
+            // 如果上传文件大于限定的容量
+            return !(fileSize > size);
+        }
     }
 }

CoreCms.Net.Web.Admin/Controllers/Com/ToolsController.cs

@@ -447,6 +447,13 @@ namespace CoreCms.Net.Web.Admin.Controllers
                 return jm;
             }
 
+            //检查上传大小
+            if (!CommonHelper.CheckBase64Size(entity.base64, filesStorageOptions.MaxSize))
+            {
+                jm.msg = "上传文件大小超过限制，最大允许上传" + filesStorageOptions.MaxSize + "M";
+                return jm;
+            }
+
             entity.base64 = entity.base64.Replace("data:image/png;base64,", "").Replace("data:image/jgp;base64,", "").Replace("data:image/jpg;base64,", "").Replace("data:image/jpeg;base64,", "");//将base64头部信息替换
             byte[] bytes = Convert.FromBase64String(entity.base64);
             MemoryStream memStream = new MemoryStream(bytes);
@@ -1953,5 +1960,86 @@ namespace CoreCms.Net.Web.Admin.Controllers
         }
 
         #endregion
+
+        #region （微信小程序）新增临时素材====================================================
+
+        /// <summary>
+        ///     （微信小程序）新增临时素材
+        /// </summary>
+        /// <returns></returns>
+        [HttpPost]
+        public async Task<AdminUiCallBack> New_Temporary_Materials_UploadImg()
+        {
+            var jm = new AdminUiCallBack();
+
+            var filesStorageOptions = await _coreCmsSettingServices.GetFilesStorageOptions();
+            //初始化上传参数
+            var maxSize = 1024 * 1024 * filesStorageOptions.MaxSize; //上传大小5M
+
+            var file = Request.Form.Files["file"];
+            if (file == null)
+            {
+                jm.msg = "请选择文件";
+                return jm;
+            }
+            var fileName = file.FileName;
+            var fileExt = Path.GetExtension(fileName).ToLowerInvariant();
+
+            //检查大小
+            if (file.Length > maxSize)
+            {
+                jm.msg = "上传文件大小超过限制，最大允许上传" + filesStorageOptions.MaxSize + "M";
+                return jm;
+            }
+
+            //检查文件扩展名
+            if (string.IsNullOrEmpty(fileExt) || Array.IndexOf(filesStorageOptions.FileTypes.Split(','), fileExt.Substring(1).ToLower()) == -1)
+            {
+                jm.msg = "上传文件扩展名是不允许的扩展名,请上传后缀名为：" + filesStorageOptions.FileTypes;
+                return jm;
+            }
+
+            byte[] bytes;
+            await using (var ms = new MemoryStream())
+            {
+                await file.CopyToAsync(ms);
+                bytes = ms.ToArray();
+            }
+
+            var accessToken = WeChatCacheAccessTokenHelper.GetWxOpenAccessToken();
+            var client = _weChatApiHttpClientFactory.CreateWxOpenClient();
+            var request = new CgibinMediaUploadRequest
+            {
+                AccessToken = accessToken,
+                FileBytes = bytes,
+                FileContentType = file.ContentType,
+                FileName = file.FileName,
+                Type = "image"
+            };
+
+            var response = await client.ExecuteCgibinMediaUploadAsync(request);
+            if (response.IsSuccessful())
+            {
+                jm.code = 0;
+                jm.msg = "上传成功!";
+                jm.data = new
+                {
+                    response.CreateTimestamp,
+                    response.MediaId,
+                    response.Type
+                };
+            }
+            else
+            {
+                jm.code = 1;
+                jm.msg = response.ErrorMessage;
+            }
+            jm.otherData = response;
+
+            return jm;
+        }
+
+        #endregion
+
     }
 }