Upload File to Firebase Storage using Admin SDK

Question

According to the Docs, I have to pass the filename to the function in order to upload a file.

// Uploads a local file to the bucket
await storage.bucket(bucketName).upload(filename, {
  // Support for HTTP requests made with `Accept-Encoding: gzip`
  gzip: true,
  metadata: {
    // Enable long-lived HTTP caching headers
    // Use only if the contents of the file will never change
    // (If the contents will change, use cacheControl: 'no-cache')
    cacheControl: 'public, max-age=31536000',
  },
});

I am using Firebase Admin SDK (Nodejs) in my server side code and clients send file in form-data which i get as File Objects. How then do i upload this when the function accepts only filename leading to filepath.

I want to be able to do something like this

app.use(req: Request, res: Response) {
 const file = req.file;
// upload file to firebase storage using admin sdk
}

Answer 1

Since the Firebase Admin SDK just wraps the Cloud SDK, you can use the Cloud Storage node.js API documentation as a reference to see what it can do.

You don't have to provide a local file. You can also upload using node streams. There is a method File.createWriteStream() which gets you a WritableStream to work with. There is also File.save() which accepts multiple kinds of things, including a Buffer. There are examples of using each method here.

Answer 2

what you should do is use the built-in function

let's say you receive the file as imageDoc in the client side and

 const imageDoc = e.target.files[0]

in node, you can now get a URL path to the object as

 const imageDocUrl = URL.createObjectURL(imageDoc)

so your final code will be

    // Uploads a local file to the bucket
    await storage.bucket(bucketName).upload(imageDocUrl, {
        // Support for HTTP requests made with "Accept-Encoding: gzip"
        gzip: true,
         metadata: {
           // Enable long-lived HTTP caching headers
           // Use only if the contents of the file will never change
           // (If the contents will change, use cacheControl: 'no-cache')
           cacheControl: 'public, max-age=31536000',
     },
});