使用 swift 将图像保存为 image/jpeg 到 firebase

Question

I'm trying to upload pictures to firebase with a mime type of image/jpeg but for some reason they all upload as application/octet-stream.

Heres my code snippet:

let storageRef = Storage.storage().reference().child("ProfilePictures/\(image).jpg")
        if let uploadData = UIImageJPEGRepresentation(self.pickedImage!, 0.5){
            storageRef.putData(uploadData, metadata: nil, completion:{ (metadata, error) in })

I got the image through a picker from the photo gallery

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let editedImage = info[UIImagePickerControllerEditedImage] as? UIImage {

        ImageButton.setBackgroundImage(editedImage, for: .normal)
        ImageButton.setTitle("", for: .normal)
        self.pickedImage = editedImage
    }

    dismiss(animated: true, completion: nil)
}

Answer 1

You have to set the metadata for the same.

Try it.

metadata = { contentType: 'image/jpeg'};

Answer 2

let imageNode = storageRef.child("imagePath/\(UUID().uuidString)")
let metaData = StorageMetadata()
metaData.contentType = "image/jpeg"
imageNode.putData(data, metadata: metaData) { (_, _) in
}

explanation:

if we upload file data without any meta data, it will recognise it as an application/octet-stream. because of data's unknown format or (missing extension), it saved as binary file which is octet-stream file.

Given that, specify file or data type we need to define its contentType. We can do it by assigning Media type, which is also known as MIME Protocol .

some of the Common MIME types :

Extension	MIME Type
.gif	image/gif
.html	text/html
.jpg or.jpeg	image/jpeg
.mp4	video/mp4

for list of MIME extension Link .
plus as per this link application/octet-stream is the default value for media type.

Swift part:

as for using firebase storage from swift, we can assign meta data using StorageMetadata class. Firebase's putData method has optional parameter metaData of type StorageMetadata