How do I use oAuth with Google C# .NET APIs?

Question

I am trying to use the .NET APIs from Google https://code.google.com/p/google-api-dotnet-client/ https://www.nuget.org/packages/Google.Apis.Authentication/

As most of these APIs from Google require an oAuth token for you to fetch any data from them, I am struggling to get over this first hurdle.

My plan is to create a very simple .NET Web API that lists out my Google Analytic's accounts via the API which I can then in turn use with AngularJS to bind to a nice little view with the JSON returned from my WebAPI call.

The problem I mentioned is that there seems to be lots of different examples floating about and I can't seem to get any to to work. Either its out of date or the sample project doesn't compile etc...

From what I can understand I need to pass an Authenticator object to the BaseClient object which is in turn used for any Service API.

Below is a rough example I am trying to get to work, but currently fails and gets an error back from Google's API because I am not logged in/passing an oAuth token. Can anyone give me any pointers or advice please.

Thanks, Warren

[HttpGet]
public IEnumerable<Account> GetAccounts()
{
    var baseClient              = new BaseClientService.Initializer();
    baseClient.ApplicationName  = "Google Stats Example";
    baseClient.Authenticator    = null; //Unsure how to get the oAuth token

    AnalyticsService stats      = new AnalyticsService(baseClient);
    var accounts                = stats.Management.Accounts.List();
    var allAccounts             = accounts.Execute();

    return allAccounts.Items;
}

Jipo · Accepted Answer · 2013-09-22 23:24:58Z

1

To create an authenticator you need a nuget package named "Google APIs OAuth2 Client Library" but i downloaded a nugget package named "Google.Apis.Oauth2.v2 Client Library". Similar names but not the same.

I was not able to find the correct one on nugget page. If you perform a search on that package it wont show up. I had to use Visual Studio Nugget searcher and activate "show prerealese packages" to install it.

edited Sep 22, 2013 at 23:24

answered Sep 22, 2013 at 20:40

Jipo

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7 Comments

Warren Buckley Over a year ago

Thanks I think I have the same nugget installed and need to try the other one you are suggesting. Do you have a working example please that I can take a look at please?

Jipo Over a year ago

Once that you install the right package you can use any example. Like this one: code.google.com/p/google-api-dotnet-client/source/browse/…

Warren Buckley Over a year ago

Thanks I have tried the ASP.NET WebForms example from that repo and it works fantastic. I just need to try and figure out how this would work in a ASP.NET WebAPI context.

Warren Buckley Over a year ago

What I want to do is to use the Google YouTube Analytics's API but for my own YouTube channel, hence I don't want users visiting the site to authenticate the API call using their own details. So the goal is to get some kind of permanent oAuth key or access token so I can do API calls to fetch my channel's YouTube statistics. Is this possible and if so how should I be going about it?

Jipo Over a year ago

You can use authentication server type instead of user authentication. You can get a private key on your google console: var provider = new Google.Apis.Authentication.OAuth2.DotNetOpenAuth.AssertionFlowClient(Google.Apis.Authentication.OAuth2.GoogleAuthenticationServer.Description, certificate)

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