How do you use Google API getRequestHeaders() to get an OAuth2 access token?

user_288389 0
Viewed 3607

I'm using the googleapis npm library to authorize using OAuth2 to access my Gmail account to send emails. I am using the following code (TypeScript) to do that:

const oAuth2Client = new google.auth.OAuth2(
  googleConfig.clientId,
  googleConfig.clientSecret
);

oAuth2Client.setCredentials({
  refresh_token: googleConfig.refreshToken
});

const accessTokenRetVal = (await oAuth2Client.refreshAccessToken()).credentials.access_token;
const accessToken = accessTokenRetVal || '';

This code works, but I get the following message:

(node:8676) [google-auth-library:DEP007] DeprecationWarning: The `refreshAccessToken` method has been deprecated, and will be removed in the 3.0 release of google-auth-library. Please use the `getRequestHeaders` method instead.

I have searched on Google, on the GitHub for the googleapis module, on StackOverflow, and I haven't been able to find any documentation for what constitutes the getRequestHeaders method. I've tried calling getRequestHeaders, but it doesn't appear to return a credentials object with an access token.

Are there official docs for how getRequestHeaders should be used in this situation?

google-auth-library google-api-nodejs-client
2 Answers

const accessToken=oAuth2Client.getAccessToken()

This worked for me

user_64061500

This new function directly gives you an 'Headers' object:

{ Authorization: 'Bearer xxxxxxxxx' }

So you can happend it directly use it as your header object:

const authHeaders = await this.auth.getRequestHeaders();
yourfetchlibrary.get('https://......', {
            headers: authHeaders,
        })

Or extract the Authorization part:

const authHeaders = await this.auth.getRequestHeaders();
yourfetchlibrary.get('https://......', {
            headers: {
                'Authorization': authHeaders.Authorization,
                'Content-Type': 'application/json',
            },
        })
user_61846080
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