Question 167684 in Javascript Question posted in
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Javascript – How to write a function that deletes user from Firestore and file from Storage?

In my app, I allow my users revoke their access. So when a user is deleted from the Firebase Authentication, I have a function that deletes the user from Firestore:

const functions = require("firebase-functions");
const admin = require("firebase-admin");
admin.initializeApp();

exports.deleteUser = functions.auth.user().onDelete((user) => {
  const uid = user.uid;

  return admin
      .firestore()
      .collection("users")
      .doc(uid)
      .delete();
});

Which works fine. The problem is that I want to delete the profile picture that is stored in Firebase Storage at: images/uid.png as well. So how to delete the document in Firestore together with the image in Storage, only if the image exists? Thanks in advance.

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2

Answers


  1. 0

    You can use the Admin SDK for Cloud Storage (API documentation) as follows:

    exports.deleteUser = functions.auth.user().onDelete(async (user) => {

    try {
        const uid = user.uid;

        await admin
            .firestore()
            .collection("users")
            .doc(uid)
            .delete();

        const file = admin.storage().bucket().file(`images/${uid}.png`);
        const fileExists = await file.exists();
        if (fileExists) {
            await file.delete();    
        }
        
        return true;
        
    } catch (error) {
        console.log(error);
        return true;
    }
});

    Note that you could also use the Delete User Data extension which is exactly done for this case: "Deletes data keyed on a userId from Cloud Firestore, Realtime Database, or Cloud Storage when a user deletes their account. "

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  2. 0

    Why don’t you delete your picture with the user deletion?

    
exports.deleteUser = functions.auth.user().onDelete((user) => {
  const uid = user.uid;
  const picture = admin.storage().bucket().file(`images/${uid}.png`);

  return picture
    .exists()
    .then(() => imageRef.delete())
    .finally(() => admin.firestore().collection("users").doc(uid).delete());
});

    Note, if the image doesn’t exist, it will throw an error. But the finally will handle it properly in order to run the deletion.

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