How to use a MVC action for downloading Google Drive streams - asp.net-mvc

Question

I am trying to make a download link for Google Drive documents through my MVC Google Drive API application using the DownloadFile method suggested by Google Drive documentation:
public static System.IO.Stream DownloadFile(
IAuthenticator authenticator, File file) {
if (!String.IsNullOrEmpty(file.DownloadUrl)) {
try {
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(
new Uri(file.DownloadUrl));
authenticator.ApplyAuthenticationToRequest(request);
HttpWebResponse response = (HttpWebResponse) request.GetResponse();
if (response.StatusCode == HttpStatusCode.OK) {
return response.GetResponseStream();
} else {
Console.WriteLine(
"An error occurred: " + response.StatusDescription);
return null;
}
} catch (Exception e) {
Console.WriteLine("An error occurred: " + e.Message);
return null;
}
} else {
// The file doesn't have any content stored on Drive.
return null;
}
}
In the View I build the controller call by the following line:
Download
which correctly sends data to my controller's action:
public FileStreamResult DownloadFile(string downloadUrl, string mimeType, string fileName){
System.IO.Stream stream = new GDriveRepository(Utils.ReturnIAuth((GoogleAuthenticator)Session["Gauthenticator"])).DownloadFile(downloadUrl);
return new FileStreamResult(stream, mimeType);
}
But the download fails and I cannot figure out where I am wrong!

Answer 1

The request to download the file must include authorization information, specifically your OAuth2 access token. See the Download Files guide in the developer documentation for more information and sample code.

Answer 2

I do not had to seek the file cause I was just trying to download the file. What I did is just read the stream i.e. through the DownloadFile API method and pass it to the browser. I enabled it through the following code:
public FileResult DownloadFile(string fileId)
{
DriveService service = Session["service"] as DriveService;
Google.Apis.Drive.v2.Data.File file = service.Files.Get(fileId).Fetch();
System.IO.Stream data = new GDriveRepository(Utils.ReturnIAuth((GoogleAuthenticator)Session["Gauthenticator"])).DownloadFile(file.DownloadUrl);
return File(data, System.Net.Mime.MediaTypeNames.Application.Octet, file.Title);
}