.NET - How to upload videos to YouTube using OAuth2.0 and Offline Access from a Windows Service

Question

I'm using the Youtube .Net libray I downloaded from Nuget.

I created a windows service which is checking a folder to upload new videos to youtube. I did the tests using a console application and for this case the user had to do authorization manually on a web browser, after that I could upload videos to youtube without any problem. The issue is when I'm trying to use the offline access.

As I'm running my code on a windows service I cannot get a the manual authorization from the user so I created my access token following this answer: https://stackoverflow.com/a/20689423/2277059

The thing is that I didn't find any example of code using the standalone version so I'm a bit lost. With my current code I'm getting all the time Error:"unauthorized_client" when trying to upload the video. The JSON file you can see on my code "client_secrets.json" is the one you automatically generate when creating the credentials for the YouTube API V3.

I tried this as well: https://stackoverflow.com/a/43895931/2277059, but got same error.

Right now I'm not refreshing the token from code, just doin it on the OAuth Playground and testing the service. Once it worked I'll research about how refresh the token with every query.

When creating the credentials I selected the type "Other" as this is a windows service.

Is it something wrong with my code or am I missing something on the configuration?

This is my code:

var token = new TokenResponse()
{
    AccessToken = "werwdsgfdg...",
    ExpiresInSeconds = 3600,
    RefreshToken = "3/dsdfsf...",
    TokenType = "Bearer"
};

Log.Info("Generating user credentials and secrets");

UserCredential credential;
string credentialsPath = System.AppDomain.CurrentDomain.BaseDirectory + "client_secrets.json";

using (var stream = new FileStream(credentialsPath, FileMode.Open, FileAccess.Read))
{
    credential = new UserCredential(new GoogleAuthorizationCodeFlow(
    new GoogleAuthorizationCodeFlow.Initializer
    {
        ClientSecrets = GoogleClientSecrets.Load(stream).Secrets,
        Scopes = new[] { YouTubeService.Scope.YoutubeUpload }
    }
    ), EsSettings.YoutubeUser, token);
}


Log.Info("Generating youtube service");
//GoogleAuthorizationCodeFlow
YouTubeService youtubeService = new YouTubeService(new BaseClientService.Initializer()
{
    HttpClientInitializer = credential,
    ApplicationName = Assembly.GetExecutingAssembly().GetName().Name
});


Log.Info("Uploading...");
using (var fileStream = new FileStream(filePath, FileMode.Open))
{

    var videosInsertRequest = youtubeService.Videos.Insert(video, "snippet,status", fileStream, "video/*");
    videosInsertRequest.ProgressChanged += videosInsertRequest_ProgressChanged;
    videosInsertRequest.ResponseReceived += videosInsertRequest_ResponseReceived;


    await videosInsertRequest.UploadAsync();
}

Answer 1

Error:"unauthorized_client"

Means that the client id you are sending hasn't been authenticated by the user.

The reason you are getting this is beouse you are doing this

Right now I'm not refreshing the token from code, just doin it on the OAuth Playground and testing the service. Once it worked I'll research about how refresh the token with every query.

Tokens are associated with a client. your client_secrets.json file contains your client but the tokens you grabbed out of oauth playground are not associated with that client.

You should should run your code once on your own machine authenticating it. Check the credentials file which can be found in your %appData% folder for the access token and refresh token and then send those to your token.

This is what the file should contain.

{  
   "access_token":"ya29.4wEk2VsbqiPfR4oH5WaYo7aYgAmlP2KSIl-heyDnPBBHMYYKnfU6YuQ-_RsDofD8QR1T",
   "token_type":"Bearer",
   "expires_in":3600,
   "refresh_token":"1/PSvxzxGB-3XU8bF2SrG6llzO-ZizE4mftrd9Edqbubg",
   "Issued":"2015-09-03T11:43:47.681+02:00"
}

You can read about how the file was created here FileDatastore