[WebApiUtils] Added save uploaded file

WebApiUtils/BusinessManager/BMRHandler.cs

@@ -1,5 +1,11 @@
-using System.Net;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net;
 using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
 using System.Web.Http;
 using iiie.Logs.DataAccess;
 using iiie.Logs.DBO;
@@ -65,5 +71,50 @@ namespace iiie.WebApiUtils.BusinessManager
             var msg = Request.CreateErrorResponse(ResultStatusToHttp(result.Status), OpResultToString(result));
             throw new HttpResponseException(msg);
         }
+
+        /// <summary>
+        /// Save the uploaded file to the temp dir
+        /// </summary>
+        /// <returns>The file path</returns>
+        public async Task<OpResult<string>> SaveFileToTemp()
+        {
+            if (!Request.Content.IsMimeMultipartContent())
+            {
+                return OpResult<string>.Error(ResultStatus.InputError, "Bad content type", "");
+            }
+            IEnumerable<HttpContent> parts = null;
+            try
+            {
+                Task.Factory.StartNew(() => parts = Request.Content.ReadAsMultipartAsync().Result.Contents,
+                        CancellationToken.None, TaskCreationOptions.LongRunning, TaskScheduler.Default).Wait();
+            }
+            catch (Exception e)
+            {
+                return OpResult<string>.Error(ResultStatus.InputError, e, "Failed to read uploaded file");
+            }
+            HttpContent file = parts.FirstOrDefault();
+            if (file == null)
+            {
+                return OpResult<string>.Error(ResultStatus.InputError, "No uploaded file", "");
+            }
+            try
+            {
+                var path = Path.GetTempFileName();
+                using (var memoryStream = new MemoryStream(await file.ReadAsByteArrayAsync()))
+                {
+                    using (var streamWriter = new FileStream(path, FileMode.OpenOrCreate))
+                    {
+                        memoryStream.WriteTo(streamWriter);
+                        memoryStream.Close();
+                        streamWriter.Close();
+                    }
+                }
+                return OpResult<string>.Ok(path);
+            }
+            catch (Exception e)
+            {
+                return OpResult<string>.Error(ResultStatus.InputError, e, "Failed to write uploaded file");
+            }
+        }
     }
 }