Implementing Google Calendar access token in JavaScript: A practical guide

I have a question about Google Calendar and I'm hoping you can assist me.

I currently have an access_token from Google Calendar that has been stored in the localStorage.

          const googleAccessToken = e.vc.access_token;
          localStorage.setItem('googleAccessToken', googleAccessToken);

Now, I would like to know how I can utilize this access_token to avoid having to authorize every time.

For instance, whenever I try to delete all events using the following code, it prompts authorization each time:

   const handleDisconnect = () => {
    gapi.load('client:auth2', () => {
      console.log('loaded client');

      gapi.client.init({
        apiKey: API_KEY,
        clientId: CLIENT_ID,
        discoveryDocs: DISCOVERY_DOCS,
        scope: SCOPES_CLEAR,
      });
      gapi.client.load('calendar', 'v3', () => {
        console.log('sdsd');
      });
      gapi.auth2
        .getAuthInstance()
        .signIn()
        .then(() => {
          var events = bb;
          var makeRequest = resource => {
            console.log(resource);

            var request = gapi.client.calendar.calendars.clear({
              calendarId: 'primary',
            });

            request.execute(resp => {
              console.log(resp);
            });
          };

          for (var j = 0; j < events.length; j++) {
            makeRequest(events[j]);
          }
        });
    });
    };

Please help me modify this code to incorporate the access_token in order to bypass the need for authorization continuously.

Answer №1

Access tokens have a one-hour expiration time. Once the access token expires, you will need to re-authorize the user in order to regain access to their data.

With OAuth2, you can request offline access which will provide you with a refresh token. Refresh tokens for applications in production are long-lived and typically do not expire. You can use a refresh token to obtain a new access token whenever necessary, eliminating the need to constantly re-authorize the user.

Unfortunately, client-side authorization using JavaScript does not support refresh tokens. In this case, it is necessary to switch to a server-side language.

If you are accessing a static calendar account owned by yourself as a developer rather than user accounts, you may utilize service accounts. However, service accounts only function with Google Calendar if domain-wide delegation to a Google Workspace account is used; they do not work with standard Gmail calendar accounts. Additionally, service accounts are not compatible with JavaScript and require a server-side programming language.

In conclusion, if you are working with JavaScript, be prepared to request user authorization again when the access token expires.

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