Firebase Admin SDKでIDトークンを検証する

import { getAuth } from "firebase/auth";

// Function to get Firebase user's id token
async function getFirebaseIdToken() {
  try {
    const auth = getAuth();
    return new Promise((resolve, reject) => {
      const unsubscribe = auth.onAuthStateChanged((user) => {
        unsubscribe(); // Stop listening for auth state changes
        if (user) {
          user
            .getIdToken(true)
            .then((idToken) => {
              console.log("idToken:", idToken);
              resolve(idToken);
            })
            .catch(reject);
        } else {
          reject(new Error("No user logged in"));
        }
      }, reject); // Handle possible errors
    });
  } catch (error) {
    console.error("Error fetching token:", error);
    throw error; // Rethrow the error if you want to handle it outside
  }
}

const { getAuth } = require('firebase-admin/auth');
const auth = getAuth();

// Function to verify idToken and get user id
async function getUserIdFromIdToken(idToken) {
  try {
    const decodedToken = await auth.verifyIdToken(idToken);
    return decodedToken.uid;
  } catch (error) {
    console.error('Error verifying idToken:', error);
    throw error;
  }
}