要求授权。在云Firestore规则中,uid似乎总是空的

    match /users/{userId} {
      allow create, read, update: if true;
    }

    match /users/{userId} {
      allow create, read, update: if request.auth.uid != null;
    }

// this is a snippet from the code where I log the user in
firebase.auth().signInWithEmailAndPassword(email, FIREBASE_USER_PASSWORD)
            .then(user => {
            // the user comes back successfully logged in, 
            // I grab its uid and add it to a preparedUser object that I've been building, 
            // then pass this user to my getFirestoreUserObject function
                preparedUser.uid = user.uid;
                getFirestoreUserObject({dispatch, user: preparedUser, navigate});
            })
            
// then the getFirestoreUserObject function:
// note that all the code below works fine when there are no security rules in place

const getFirestoreUserObject = ({dispatch, user, navigate}) => {
    const {name, email, imageUrl} = user;
    // if I ask for currentUser here, I get back my logged in user
    const currentUser = firebase.auth().currentUser;

    // email is defined correctly here as the user's email
    firebase.firestore().collection('users').doc(`${email}`)
        .get() // the request fails here due to insufficient permissions
        .then(doc => {
            if (doc.exists) {
                const currentUser = doc.data();

                getUserFavorites({dispatch, currentUser, navigate});
            } else {
                createUserInFirestore({dispatch, user, navigate});
            }
        })
};