Method choosePathComponents

input/inpututils/s3.go:135–168

If the path is a full s3/s3a/s3n url the extract the bucket, key and scheme from it and return them, else use the bucket from the instance, path as key and default scheme "s3"

(path string)

// it and return them, else use the bucket from the instance, path as key and
// default scheme "s3"
func (s *S3Input) choosePathComponents(path string) (scheme, bucket, key string, err error) {
	s3Url, err := url.Parse(path)
	scheme = ""
	bucket = ""
	key = ""
	// If the path is url compliant and its scheme is s3 or none and there is a
	// path (downloading a whole bucket is not supported/safe) we can proceed
	// to assign the bucket and path
	if err != nil {
		return "", "", "", err
	}

	validScheme, err := isValidScheme(s3Url.Scheme)
	if err != nil {
		return "", "", "", err
	}

	if s3Url.Path == "" || (s3Url.Scheme != "" && !validScheme) {
		return "", "", "", errUnsupportedURLScheme(path)
	}

	scheme = ""
	bucket = s.Bucket
	key = path

	if validScheme {
		// The bucket is the "host" portion of the s3 url and the key is
		// the "path"
		scheme = s3Url.Scheme
		bucket = s3Url.Host
		key = s3Url.Path[1:]
	}
	return scheme, bucket, key, nil
}