401 System.UnauthorizedAccessException when access Dropbox With SharpBox API

Question

The code

config = CloudStorage.GetCloudConfigurationEasy(nSupportedCloudConfigurations.DropBox) 
    as DropBoxConfiguration;
//config.AuthorizationCallBack = new Uri("http://localhost:61926/DBoxDemo.aspx");

requestToken = DropBoxStorageProviderTools.GetDropBoxRequestToken(config, "KEY", "SECRET");
//Session["requestToken"] = requestToken;

string AuthoriationUrl = DropBoxStorageProviderTools.GetDropBoxAuthorizationUrl(
    config, requestToken);
Process.Start(AuthoriationUrl);
accessToken = DropBoxStorageProviderTools.ExchangeDropBoxRequestTokenIntoAccessToken(
    config, "xxxxxxxxxxxxx", "xxxxxxxxxxxxx", requestToken);

CloudStorage dropBoxStorage = new CloudStorage();

var storageToken = dropBoxStorage.Open(config, accessToken);
var publicFolder = dropBoxStorage.GetFolder("/");

// upload a testfile from temp directory into public folder of DropBox
String srcFile = Environment.ExpandEnvironmentVariables(@"C:\Test\MyTestFile.txt");
var rep = dropBoxStorage.UploadFile(srcFile, publicFolder);
MessageBox.Show("Uploaded Successfully..");

**dropBoxStorage.DownloadFile("/MyTestFile.txt",
Environment.ExpandEnvironmentVariables("D:\\test"));**

MessageBox.Show("Downloaded Successfully..");
dropBoxStorage.Close();

This is the Error shown in Visual Studio.

Screenshot

When I try to Download It Gives me ERROR Upload Works Fine PLEASE HELP — maniac, Jan 30 '15 at 12:23
Same Code works Fine in Console Application But when i Try to Put it in Web Form or Window Form It Gives Error Unauthorized access in Downloading. — maniac, Jan 30 '15 at 12:24
If uploading works, meaning the access token is valid, but downloading doesn't, it sounds like an issue signing the download calls. I believe SharpBox uses HMAC-SHA1 signing by default. I recommend changing that to PLAINTEXT. (I unfortunately am not that familiar with using SharpBox though, so I don't know how to do so specifically.) — Greg, Jan 30 '15 at 17:06
Yup Problem solved. actually SharpBox only works with .net framwork 4.0 so previously it was 4.5. so i changed it to 4.0 now it works :) — maniac, Feb 04 '15 at 08:48

score 3 · Accepted Answer · edited Mar 03 '15 at 22:32

SharpBox has a bug that only occurs in .NET 4.5, because the behavior of the class System.Uri has changed from 4.0 to 4.5.

The method GetDownloadFileUrlInternal() in DropBoxStorageProviderService.cs generates an incorrect URL, because it changes a slash in %2f. In .NET 4.0, this URL will be converted correctly back through the System.Uri object in the method GenerateSignedUrl() in OAuthUrlGenerator.cs.

I have changed the method GetDownloadFileUrlInternal() from this...

public static String GetDownloadFileUrlInternal(IStorageProviderSession session, ICloudFileSystemEntry entry)
{
    // cast varibales
    DropBoxStorageProviderSession dropBoxSession = session as DropBoxStorageProviderSession;

    // gather information
    String rootToken = GetRootToken(dropBoxSession);
    String dropboxPath = GenericHelper.GetResourcePath(entry);

    // add all information to url;
    String url = GetUrlString(DropBoxUploadDownloadFile, session.ServiceConfiguration) + "/" + rootToken;

    if (dropboxPath.Length > 0 && dropboxPath[0] != '/')
        url += "/";

    url += HttpUtilityEx.UrlEncodeUTF8(dropboxPath);

    return url;
}

...to this...

public static String GetDownloadFileUrlInternal(IStorageProviderSession session, ICloudFileSystemEntry entry)
{
    // cast varibales
    DropBoxStorageProviderSession dropBoxSession = session as DropBoxStorageProviderSession;

    // gather information
    String rootToken = GetRootToken(dropBoxSession);

    // add all information to url;
    String url = GetUrlString(DropBoxUploadDownloadFile, session.ServiceConfiguration) + "/" + rootToken;

    ICloudFileSystemEntry parent = entry.Parent;
    String dropboxPath = HttpUtilityEx.UrlEncodeUTF8(entry.Name);

    while(parent != null)
    {
        dropboxPath = HttpUtilityEx.UrlEncodeUTF8(parent.Name) + "/" + dropboxPath;
        parent = parent.Parent;
    }

    if (dropboxPath.Length > 0 && dropboxPath[0] != '/')
        url += "/";

    url += dropboxPath;

    return url;
}

and currently it works with .NET 4.5. It may exist a better way to fix the problem, but currently no misconduct noticed.

We downloaded the source code from https://sharpbox.svn.codeplex.com/svn/, made the changes you suggested and it worked. Only problem is that there is no branch for version 1.2.0.542 - latest is 1.1.0.440 - do you know where to find version 1.2.0.542? — Miros, Feb 13 '15 at 12:56

401 System.UnauthorizedAccessException when access Dropbox With SharpBox API

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