Firebase Functions get files from storage - firebase

Question

I have to send a file to an API, therefor I have to use fs.readFileSync(). After uploading the picture to the storage, I am calling my function to execute the API call. But I cannot get the file from the storage. This is a section of the code, which always gets null in the result. I tried also to .getFiles() without a parameter and then I got all files but I dont want to filter them by iteration.
exports.stripe_uploadIDs = functions.https //.region("europe-west1")
.onCall((data, context) => {
const authID = context.auth.uid;
console.log("request is authentificated? :" + authID);
if (!authID) {
throw new functions.https.HttpsError("not authorized", "not authorized");
}
let accountID;
let result_fileUpload;
let tempFile = path.join(os.tmpdir(), "id_front.jpg");
const options_id_front_jpeg = {
prefix: "/user/" + authID + "/id_front.jpg"
};
const storageRef = admin
.storage()
.bucket()
.getFiles(options_id_front)
.then(results => {
console.log("JPG" + JSON.stringify(results));
// need to write this file to tempFile
return results;
});
const paymentRef = storageRef.then(() => {
return admin
.database()
.ref("Payment/" + authID)
.child("accountID")
.once("value");
});
const setAccountID = paymentRef.then(snap => {
accountID = snap.val();
return accountID;
});
const fileUpload = setAccountID.then(() => {
return Stripe.fileUploads.create(
{
purpose: "identity_document",
file: {
data: tempFile, // Documentation says I should use fs.readFileSync("filepath")
name: "id_front.jpg",
type: "application/octet-stream"
}
},
{ stripe_account: accountID }
);
});
const fileResult = fileUpload.then(result => {
result_fileUpload = result;
console.log(JSON.stringify(result_fileUpload));
return result_fileUpload;
});
return fileResult;
});
Result is:
JPG[[]]

Answer 1

You need to download your file from a bucket to your local function context env.
After your Firebase function start executing you can call the below:
More or less the below should work, just tweak to your needs. Call this within you .onCall context, you get the idea
import admin from 'firebase-admin';
import * as path from 'path';
import * as os from 'os';
import * as fs from 'fs';
admin.initializeApp();
const { log } = console;
async function tempFile(fileBucket: string, filePath: string) {
const bucket = admin.storage().bucket(fileBucket);
const fileName = 'MyFile.ext';
const tempFilePath = path.join(os.tmpdir(), fileName);
const metadata = {
contentType: 'DONT_FORGET_CONTEN_TYPE'
};
// Donwload the file to a local temp file
// Do whatever you need with it
await bucket.file(filePath).download({ destination: tempFilePath });
log('File downloaded to', tempFilePath);
// After you done and if you need to upload the modified file back to your
// bucket then uploaded
// This is optional
await bucket.upload(tempFilePath, {
destination: filePath,
metadata: metadata
});
//free up disk space by realseasing the file.
// Otherwise you might be charged extra for keeping memory space
return fs.unlinkSync(tempFilePath);
}