How to get access token from refresh token in gmail api in asp.net

Question

I'm using oAuth 2.0 to authenticate gmail api v1 and getting the access token and refresh token but how to get access token using refresh token.

UserCredential credential;
credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
       new ClientSecrets
       {
          ClientId = "my client id",
          ClientSecret = "my client secret"
       },
       new[] { GmailService.Scope.GmailSend },
       "user",
       CancellationToken.None).Result;

// Create Gmail API service.
var service = new GmailService(new BaseClientService.Initializer()
{
   HttpClientInitializer = credential,
   ApplicationName = ApplicationName,
});

string RefreshToken = credential.Token.RefreshToken;

Linda Lawton - DaImTo · Accepted Answer · 2016-05-03 10:32:19Z

1

The Google .Net client library handles all that for you. Once you make your first request using your service it will request an access token using the refresh token.

Anwser: make a simple request to the Gmail API will fetch a access token if needed.

answered May 3, 2016 at 10:32

Linda Lawton - DaImTo

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Comments

lal · Accepted Answer · 2016-05-03 12:28:31Z

0

I don't know how to do it using .Net library. To do it manually,

POST

"client_secret=" + [ClientSecret] + "&grant_type=refresh_token" + "&refresh_token=" + [RefreshToken] + "&client_id=" + [ClientID]

To https://www.googleapis.com/oauth2/v3/token

You need to replace data in square bracket with your details

answered May 3, 2016 at 12:28

lal

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Comments

Hafeezjaha Shaikh · Accepted Answer · 2022-02-08 12:24:54Z

0

working code

string[] scopes = new string[] { "https://mail.google.com/" };

UserCredential credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
         new ClientSecrets
         {
            ClientId = "my client id",
            ClientSecret = "my client secret"
         },
         scopes,
        "user",
         CancellationToken.None).Result;
string RefreshToken = credential.Token.RefreshToken;//you will get Refreshtoken

edited Feb 8, 2022 at 12:24

answered Feb 8, 2022 at 12:18

Hafeezjaha Shaikh

12 bronze badges

1 Comment

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