Generating Auth Token and re-using it for list of image files stored on B2 bucket

[StefanCepa]

Hello, I am trying to generate Authorization token which I would like to re-use in order to grant tmp access to image files that I am storing on B2 bucket.

Here is my code:

type B2 struct {
	ID         string          // unique identifier for B2 cloud storage
	Key        string          // application key that controls access to B2 storage
	BucketName string          // name of the container that holds files
	ObjectKey  string          //  absolute path to specific file/directory inside given bucket
	AuthToken  string          // authentication token which is used in order to grant access to bucket private files
	Client     *b2.Client      // b2 client object
	Context    context.Context // environment context
	Bucket     *b2.Bucket      // b2 bucket object
}

//
// Creates and initializes new B2 struct.
//
// Arguments:
//   - id string: unique identifier for B2 cloud storage
//   - key string: application key that controls access to B2 storage
//   - bucket string: name of a bucket on b2 cloud storage
//   - objectKey string: path to specific file or directory that is part of B2 bucket
//
// Returns:
//   - Reference to new B2 instance
//
func NewB2Driver(id string, key string, bucketName string, objectKey string) (*B2, error) {
	var b2Driver B2

	b2Driver.Context = context.Background()

	client, err := newB2Client(&b2Driver.Context, id, key)
	if err != nil {
		glog.Errorf("Failed to create new B2 client object, reason - %v", err)
		return nil, err
	}
	b2Driver.Client = client

	bucket, err := newB2Bucket(&b2Driver.Context, client, bucketName, objectKey)
	if err != nil {
		glog.Errorf("Failed to create new B2 bucket object, reason - %v", err)
		return nil, err
	}
	b2Driver.Bucket = bucket

	b2Driver.ID = id
	b2Driver.BucketName = bucketName
	b2Driver.Key = key
	b2Driver.ObjectKey = objectKey

	return &b2Driver, nil
}

func (b2Obj *B2) GenerateTmpAuthURL(prefix string, expireAfter time.Duration) (string, error) {
	if b2Obj.AuthToken == "" {
		authToken, err := b2Obj.Bucket.AuthToken(b2Obj.Context, prefix, expireAfter)
		if err != nil {
			glog.Errorf("Failed to generate temporary authorization token for B2 cloud storage, reason - %v", err)
			return "", err
		}

		glog.V(2).Infof("[INFO]: Successfully generated tmp authorization token for B2 cloud storage. Token - %s", authToken)
		b2Obj.AuthToken = authToken
	}

	objUrl := b2Obj.Bucket.Object(b2Obj.ObjectKey).URL()
	objUrl = objUrl + "?Authorization=" + b2Obj.AuthToken

	return objUrl, nil
}

And here is how resulting URL looks like once functions above are executed:
https://f003.backblazeb2.com/file/cart-test-thumbnail-lambda-thumbnail-bucket/thumbnail_20181231235907_0_181094_0.jpeg?Authorization=3_20190917124617_ed5bc772862c3ab6ada9a331_0ed4df528f58a6e91bdee9dbb96a7425501100b6_003_20190917125117_0084_dnld

When I copy paste URL into the browser I get the following:

Is this suppose to happen? Shouldnt I have access to the file without having to SIGN IN? Also, whenever I enter my information I get back right to the same pop-up window, nothing happens. Its like I cannot sign in.