Facebook.gs

/*
 * Facebook OAuth 2.0 guides:
 * https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow
 * https://developers.facebook.com/apps/
 */

var CLIENT_ID = '...';
var CLIENT_SECRET = '...';

/**
 * Authorizes and makes a request to the Facebook API.
 */
function run() {
  var service = getService();
  if (service.hasAccess()) {
    var url = 'https://graph.facebook.com/v2.6/me';
    var response = UrlFetchApp.fetch(url, {
      headers: {
        'Authorization': 'Bearer ' + service.getAccessToken()
      }
    });
    var result = JSON.parse(response.getContentText());
    Logger.log(JSON.stringify(result, null, 2));
  } else {
    var authorizationUrl = service.getAuthorizationUrl();
    Logger.log('Open the following URL and re-run the script: %s',
        authorizationUrl);
  }
}

/**
 * Reset the authorization state, so that it can be re-tested.
 */
function reset() {
  getService().reset();
}

/**
 * Configures the service.
 */
function getService() {
  return OAuth2.createService('Facebook')
    // Set the endpoint URLs.
    .setAuthorizationBaseUrl('https://www.facebook.com/dialog/oauth')
    .setTokenUrl('https://graph.facebook.com/v2.6/oauth/access_token')

    // Set the client ID and secret.
    .setClientId(CLIENT_ID)
    .setClientSecret(CLIENT_SECRET)

    // Set the name of the callback function that should be invoked to complete
    // the OAuth flow.
    .setCallbackFunction('authCallback')

    // Set the property store where authorized tokens should be persisted.
    .setPropertyStore(PropertiesService.getUserProperties());
}

/**
 * Handles the OAuth callback.
 */
function authCallback(request) {
  var service = getService();
  var authorized = service.handleCallback(request);
  if (authorized) {
    return HtmlService.createHtmlOutput('Success!');
  } else {
    return HtmlService.createHtmlOutput('Denied.');
  }
}

/**
 * Logs the redict URI to register.
 */
function logRedirectUri() {
  Logger.log(getService().getRedirectUri());
}