how to download google drive files directly to onedrive cloud

String base64Value = 64String ( ( url ) ) If given url is a Dropbox url, returns an equivalent direct url If given url is a OneDrive url, returns an equivalent direct url Note: Probably does not work for files that Google considers too large to virus check, around 25MB, as Google will issue a prompt If given url is a Google Drive url, returns an equivalent direct url, avoiding initial page with download button Public static string CheckForCloudDriveUrl ( string url ) HttpStatusCode statusCode = response.StatusCode Response = await HandleAnyRedirectsAsync ( url, response ) HttpResponseMessage response = await httpClient.SendAsync ( new HttpRequestMessage ( HttpMethod.Head, url ) ) InitialiseHttpClient () // Shared across app Exclude (OneDrive For Business / Office 365 or Sharepoint)ĭevice.BeginInvokeOnMainThread ( async () =>Īwait ( T.InvalidUrl, T.SharepointAndOneDriveForBusinessAndMicrosoft365NotSupported, T.ButtonOK ) Public static async Task UrlExistsAsync ( string url ) ( new .MediaTypeWithQualityHeaderValue ( 'application/octet-stream' ) ) HttpClient.Timeout = TimeSpan.FromSeconds ( 60 ) HttpClient = new HttpClient ( httpClientHandler ) HttpClientHandler = new HttpClientHandler Use of a single HttpClient instance is across entire app is recommended Sets up shared HttpClient in httpClient, if not already done

Public static void InitialiseHttpClient () Sharepoint-based urls are not handled - not sure it's possible without API. For Google Drive, there may be a file size limit of around 25MB. Also in the case of OneDrive, a transformation is required before even checking the validity of the URL. without receiving intervening HTML offering a ‘Download’ button. Some transformations on URLs are involved to get direct download links, i.e. Dropbox URLs work correctly in cUrl and Fiddler. If you’re not using Xamarin Forms, you probably can ignore the redirect handling part. URL-encoding the ‘#’ solves the problem, at the cost of having to handle redirects yourself instead of relying on auto redirect.

Dropbox issues two redirects, the second of which has a URL ending in a ‘#’ character (which is not a valid URL character afaik). I’ve it to Microsoft and provide a workaround here. In the case of Dropbox, there is currently a bug in Xamarin Forms, at least for Visual Studio Mac.

Because I had a lot of trouble working out how to download files from Dropbox, Google Drive and OneDrive URLs in C# Xamarin Forms (without resorting to drive APIs), sharing my solution below.

How to download google drive files directly to onedrive cloud