Why use async function "getDownloadURL" to get file URL in Firebase Storage

kusumoto_teruya

In order to get the URL of the file uploaded to Cloud Storage, we have to write the following code.

import { getStorage, ref } from 'firebase/storage'

const storage = ref(getStorage(firebaseApp))
const url = await getDownloadURL(ref(storage, 'images/sample.jpg'))

Why do we need to call an async function instead of knowing the URL of the unique file from the start?
I guess the authentication is done when you call "getDownloadURL".
But if authentication is required, why not issue a unique URL for the file and then authenticate when that URL is called?

alex marmo

Why do we need to call an async function instead of knowing the URL of the unique file from the start?

This is because the download URL is generated on the server. This URL will be available as soon as the data is successfully uploaded to Firebase Storage. This is an asynchronous operation because it takes time to actually upload the data to the server. Depending on the connection speed and status, and the size of the data, the upload can take anywhere from a few hundred milliseconds to a few seconds to complete. Among other things, the URL contains a token that is automatically created whenever a file is uploaded to Cloud Storage. This is a random token, which makes the URL difficult to guess.

That's why you can't know the final download URL ahead of time. This is different from pushing IDs in Realtime Database or generating document IDs in Firestore, both of which are done on the client side.

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