How do I persist Google credentials in ASP.NET Core - Stack Overflow

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I followed this guide .0 which lead me here and I've managed to get Google auth working. I have access to the GoogleCredential object via the IGoogleAuthProvider.

Now I'm trying to persist the credentials so that I can run a background task at a later point on behalf of the user. Along the way I found this .0#save-the-access-token which provides a way to get the access token but that's of limited use for me without the refresh token.

Can anyone point me in the right direction?

I followed this guide https://learn.microsoft/en-us/aspnet/core/security/authentication/social/google-logins?view=aspnetcore-9.0 which lead me here https://developers.google/api-client-library/dotnet/guide/aaa_oauth and I've managed to get Google auth working. I have access to the GoogleCredential object via the IGoogleAuthProvider.

Now I'm trying to persist the credentials so that I can run a background task at a later point on behalf of the user. Along the way I found this https://learn.microsoft/en-us/aspnet/core/security/authentication/social/social-without-identity?view=aspnetcore-9.0#save-the-access-token which provides a way to get the access token but that's of limited use for me without the refresh token.

Can anyone point me in the right direction?

• asp-core
• google-oauth

Share Improve this question Follow edited Mar 11 at 4:31 marc_s 756k184184 gold badges1.4k1.4k silver badges1.5k1.5k bronze badges asked Mar 11 at 2:34 Alejandro HuertaAlejandro Huerta 1,14422 gold badges1717 silver badges3838 bronze badges

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2 Answers 2

Sorted by: Reset to default 0

If you want to get the refresh token for the google auth, you should set the `googleOptions.AccessType = "offline"; ` which request the refresh token.

More details, you could refer to below codes:

builder.Services.AddAuthentication(options =>
{
     options.DefaultChallengeScheme = "Google"; // Use the scheme name you've configured for Google authentication
}).AddGoogle("Google",googleOptions =>
{
    googleOptions.ClientId = " ";
    googleOptions.ClientSecret = " ";
    googleOptions.SaveTokens = true;
 
    googleOptions.Scope.Add("https://www.googleapis/auth/userinfo.profile");
    googleOptions.Scope.Add("https://www.googleapis/auth/userinfo.email");
    googleOptions.AccessType = "offline"; // Request a refresh token

    googleOptions.Events = new OAuthEvents
    {
        OnCreatingTicket = context =>
       {

           var accessToken = context.AccessToken;

           var re = context.RefreshToken;

           return Task.CompletedTask;

       }
    };
});

Result:

While Zhang's answer would likely work fine using that library, I'm using AspNetCore3 due to being pointed in that direction via the current tutorial and guides. I did some digging into the AspNetCore3 source code and managed to put together a solution following what it does to manage its AccessTokens.

Here's a link to the source file and the relevant line already marked https://github/googleapis/google-api-dotnet-client/blob/main/Src/Support/Google.Apis.Auth.AspNetCore3/GoogleAuthProvider.cs#L62 With that it's fairly straightforward to persist what you need.

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