Google Identity Services : How to refresh access_token for Google API after one hour?

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I have implemented the new Google Identity Services to get an access_token to call the Youtube API. I try to use this on an Angular app.

this.tokenClient = google.accounts.oauth2.initTokenClient({
  client_id: googleApiClientId,
  scope: 'https://www.googleapis.com/auth/youtube.readonly',
  callback: (tokenResponse) => {
    this.accessToken = tokenResponse.access_token;
  },
});

When I call this.tokenClient.requestAccessToken(), I can get an access token and use the Youtube API, that works.

But after one our, this token expire. I have this error : "Request had invalid authentication credentials."

How can I get the new refreshes access_token transparently for the user ?

access-token oauth-2.0 authorization api authentication
1 Answers

To refresh the access token in a transparent way for the end-user you have to use the Refresh Token, This token will also come in the response to your call.

With this token, you can do a POST call to the URL: https://www.googleapis.com/oauth2/v4/token with the following request body

client_id: <YOUR_CLIENT_ID>
client_secret: <YOUR_CLIENT_SECRET>
refresh_token: <REFRESH_TOKEN_FOR_THE_USER>
grant_type: refresh_token

refresh token never expires so you can use it any number of times. The response will be a JSON like this:

{
  "access_token": "your refreshed access token",
  "expires_in": 3599,
  "scope": "Set of scope which you have given",
  "token_type": "Bearer"
}
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