import * as rp from 'request-promise-native';

export class ApiTokenResolver {
  public static getAccessToken(host: string, apiToken: string, proxy?: string): Promise<string> {
    const base64ApiToken = Buffer.from('apitoken:' + apiToken).toString('base64');
    const options = {
      url: host + '/services/mtm/v1/oauth2/token',
      headers: { Authorization: 'Basic ' + base64ApiToken },
      form: { grant_type: 'client_credentials' }
    };
    return rp.post({ ...options, proxy }).then((response) => JSON.parse(response)['access_token']);
  }
}