fixed download file url filename and port (#46)

- Path.GetFilename is not cross-platform
- Set UriBuilder.Port to -1 to prevent port from being included in string

src/Player.Vm.Api/Domain/Vsphere/Services/VsphereService.cs

@@ -811,11 +811,14 @@ public async Task<string> GetVmFileUrl(Guid id, string username, string password
 
                     if (_rewriteHostOptions.RewriteHost)
                     {
-                        var builder = new UriBuilder(fileTransferUrl);
+                        var builder = new UriBuilder(fileTransferUrl)
+                        {
+                            Port = -1
+                        };
 
                         var query = HttpUtility.ParseQueryString(builder.Query);
                         query[_rewriteHostOptions.RewriteHostQueryParam] = builder.Host;
-                        var fileName = Path.GetFileName(filepath);
+                        var fileName = this.GetFileName(filepath);
                         query["fileName"] = fileName;
                         builder.Query = query.ToString();
 
@@ -829,6 +832,12 @@ public async Task<string> GetVmFileUrl(Guid id, string username, string password
             return "";
         }
 
+        private string GetFileName(string filePath)
+        {
+            var fileUri = new Uri($"file://{filePath}");
+            return Path.GetFileName(fileUri.ToString());
+        }
+
         private async Task<TaskInfo> WaitForVimTask(ManagedObjectReference task, VsphereConnection connection)
         {
             int i = 0;