Evernote AuthToken via OAuth

Question

I have worked with OAuth before (working with Twitter and PHP) and it was simple. I am trying to get OAuth to work with the EverNote API sample https://github.com/evernote/evernote-sdk-csharp (because, as they say, "Real applications authenticate with Evernote using OAuth"). I looked at these:

Simple C# Evernote API OAuth example or guide?

https://github.com/sethhitch/csharp-oauth-sample

http://blog.stevienova.com/2008/04/19/oauth-getting-started-with-oauth-in-c-net/

But, I still don't know how to do this... This is my code:

    // Real applications authenticate with Evernote using OAuth, but for the
    // purpose of exploring the API, you can get a developer token that allows
    // you to access your own Evernote account. To get a developer token, visit 
    // https://sandbox.evernote.com/api/DeveloperToken.action
    String authToken = "myAuthCode";

    if (authToken == "your developer token") {
      Console.WriteLine("Please fill in your developer token");
      Console.WriteLine("To get a developer token, visit https://sandbox.evernote.com/api/DeveloperToken.action");
      return;
    }

How can I add OAuth to this to get my authToken?

Thank you.

Answer 1

The simple code to add is:

EvernoteOAuth oauth = new EvernoteOAuth(EvernoteOAuth.HostService.Sandbox, myConsumerKey, myConsumerSecret);
        string errResponse = oauth.Authorize();
        if (errResponse.Length == 0)
        {
            Console.WriteLine(string.Format("Token: {0}\r\n\r\nExpires: {1}\r\n\r\nNoteStoreUrl: {2}\r\n\r\nUserId: {3}\r\n\r\nWebApiUrlPrefix: {4}", oauth.Token, oauth.Expires, oauth.NoteStoreUrl, oauth.UserId, oauth.WebApiUrlPrefix));
        }
        else
        {
            Console.WriteLine("A problem has occurred in attempting to authorize the use of your Evernote account: " + errResponse);
        }

You will need to use this assembly:

using EvernoteOAuthNet;

Available here:

http://www32.zippyshare.com/v/98249023/file.html

Answer 2

Check this sample project : http://discussion.evernote.com/topic/30584-here-is-a-net-oauth-assembly/ . I think this will help you to understand how oauth works.

Answer 3

For anyone trying to get this to work in MVC, I was playing around with Evernote, OpenAuth and C# this morning and managed to get it all working. I have put together a blog post / library explaining the experience and outlining how to do it with MVC here - http://www.shaunmccarthy.com/evernote-oauth-csharp/ - it uses the AsyncOAuth library: https://github.com/neuecc/AsyncOAuth

I wrote a wrapper around AsyncOAuth that you might find useful here: https://github.com/shaunmccarthy/AsyncOAuth.Evernote.Simple

One prickly thing to be aware of - the Evernote Endpoints (/oauth and /OAuth.action) are case sensitive

// Download the library from https://github.com/shaunmccarthy/AsyncOAuth.Evernote.Simple

// Configure the Authorizer with the URL of the Evernote service,
// your key, and your secret. 
var EvernoteAuthorizer = new EvernoteAuthorizer(
    "https://sandbox.evernote.com", 
    "slyrp-1234", // Not my real id / secret :)
    "7acafe123456badb123");

// First of all, get a request token from Evernote - this causes a 
// webrequest from your server to Evernote.
// The callBackUrl is the URL you want the user to return to once
// they validate the app
var requestToken = EvernoteAuthorizer.GetRequestToken(callBackUrl);

// Persist this token, as we are going to redirect the user to 
// Evernote to Authorize this app
Session["RequestToken"] = requestToken;

// Generate the Evernote URL that we will redirect the user to in
// order to 
var callForwardUrl = EvernoteAuthorizer.BuildAuthorizeUrl(requestToken);

// Redirect the user (e.g. MVC)
return Redirect(callForwardUrl);

// ... Once the user authroizes the app, they get redirected to callBackUrl

// where we parse the request parameter oauth_validator and finally get
// our credentials
// null = they didn't authorize us
var credentials = EvernoteAuthorizer.ParseAccessToken(
    Request.QueryString["oauth_verifier"], 
    Session["RequestToken"] as RequestToken);

// Example of how to use the credential with Evernote SDK
var noteStoreUrl = EvernoteCredentials.NotebookUrl;
var noteStoreTransport = new THttpClient(new Uri(noteStoreUrl));
var noteStoreProtocol = new TBinaryProtocol(noteStoreTransport);
var noteStore = new NoteStore.Client(noteStoreProtocol);
List<Notebook> notebooks = client.listNotebooks(EvernoteCredentials.AuthToken);

Answer 4

You can also try the OAuth library found here : https://code.google.com/p/devdefined-tools/wiki/OAuth and follow the steps mentioned here.