Firebase storage downloadUrl completion handler always returns error

Question

So I am following the documentation but I always get this error:

There was an error: User does not have permission to access gs://***-*****.appspot.com/(null).

The images are uploaded successfully though. The only thing is that when the completion handler gets called, it returns an error and I cannot fetch the image path.

Here is the code:

func uploadImage(_ image: UIImage, completion: @escaping (String?, Error?) -> Void) {
        let filename = "\(Date().timeIntervalSince1970)"
        let imageReference = storage.child(FirestoreStorage.dishImagesPath).child(filename)

        guard let imageData = UIImageJPEGRepresentation(image, 0.8) else {
            completion(nil, CommonError.imageConversionError)
            return
        }
        let metadata = StorageMetadata()
        metadata.contentType = "image/jpeg"

        imageReference.putData(imageData, metadata: metadata, completion: { [storage] (metadata, error) in
            storage.downloadURL(completion: { (url, error) in
                guard let url = url else {
                    completion(nil, error)
                    return
                }
                completion(url.absoluteString, nil)
            })
        })
    }

Also, these are my security rules @ Firebase Storage:

service firebase.storage {
   match /b/my-project.appspot.com/o {
    match /{allPaths=**} {
      allow read, write;
    }
  }
}

goblin goblin · Accepted Answer · 2018-05-28T18:43:09

The error occured because you're pointing to the Storage service to get the download URL.

storage.downloadURL

You should instead use Storage reference to get it.

imageReference.downloadURL

Firebase storage downloadUrl completion handler always returns error

2 Answers