如何检查用户是否使用 chrome identity api 登录？

Question

I am trying to add authentication to my chrome extension and I am using chrome identity-api for that. I am using the getAuthToken API for fetching the access token. I want to provide login/logout functionality in my popup.html such that login button is displayed only when the user is not logged in (or logged out). However, I am not able to figure out a way to check if the user is logged in or not.

Answer 1

You need to check chrome.runtime.lastError

I'm doing this using interactive: false when my popup loads.

If the user isn't logged in, the call to getAuthToken will fail and my function will return. If the user is logged in, I display a logged in element and display a logout button.

If a user isn't logged in, I have a sign in with google button for them to click.

window.onload = () => {
  console.log("starting popup.js");

  chrome.identity.getAuthToken({ interactive: false }, function (token) {
    // If the user isn't logged in yet, make them login via clicking button
    if (chrome.runtime.lastError) {
      // Something went wrong
      console.warn("Whoops.. " + chrome.runtime.lastError.message);
      // Maybe explain that to the user too?
      return;
    }
    document.getElementById("logged-in").style.display = "block";
    document.getElementById("btn-logout").disabled = false;

};