添加一个文件下载接口，下载视频举报的文件

.gitignore

@@ -42,6 +42,7 @@
 *.su
 *.idb
 *.pdb
+*.mp4
 
 # Kernel Module Compile Results
 *.mod*

24Hour/Controllers/LoginController.cs

@@ -455,7 +455,29 @@ namespace _24Hour.Controllers
             return ret;
         }
 
+        /// <summary>
+        /// download file for video repot module
+        /// </summary>
+        /// <returns></returns>
+        [HttpGet, AllowAnonymous]
+        [Route("download")]
+        public IActionResult DownloadFile(string filepath)
+        {
+            var fileaddr = Path.Combine(Environment.CurrentDirectory,"wwwroot");
+            fileaddr += filepath;  
+            if (System.IO.File.Exists(fileaddr) == false)
+            {
+                return new BadRequestResult();
+            }
+            return new FileStreamResult(new FileStream(path: fileaddr, FileMode.Open), "application/octet-stream")
+            {
+                FileDownloadName = Path.GetFileName(fileaddr),
+            };
+        }
+
     }
+
+
     public class UserLogin
     {
         [DataMember]