To generate a URL for making an OAuth login with Microsoft

microsoft-login.ts

/**
 * Generate the redirect URL for a user to login with a Microsoft account.
 * - The clientId is the id of the Active Directory application.
 * - The redirect URL must be configured in that application (https!)
 * - If an email is given, it will be preselected in the login box.
 */
getMsOauthUrl(clientId: string, redirect: string, state: string, email?: string): string
{
  let url = `https://login.microsoftonline.com/common/oauth2/v2.0/authorize?` +
              `client_id=${clientId}` +
              '&response_type=code' +
              `&redirect_uri=${encodeURI(redirect)}` +
              '&scope=User.Read' +
              '&response_mode=query' +
              '&state=' + state;
  if (email)
  {
    url = `${url}&login_hint=${encodeURI(email)}&prompt=login`;
  }
  else
  {
    url = `${url}&prompt=select_account`;
  }
  return url;
}