func Download()

in pkg/download/downloader.go [47:108]
58 lines of code
13 McCabe index (conditional complexity)

func Download(ctx *log.Context, d Downloader) (int, io.ReadCloser, error) {
	req, err := d.GetRequest()
	if err != nil {
		return -1, nil, errors.Wrapf(err, "failed to create http request")
	}
	requestID := req.Header.Get(xMsClientRequestIdHeaderName)
	if len(requestID) > 0 {
		ctx.Log("info", fmt.Sprintf("starting download with client request ID %s", requestID))
	}
	resp, err := httpClient.Do(req)
	if err != nil {
		err = urlutil.RemoveUrlFromErr(err)
		return -1, nil, errors.Wrapf(err, "http request failed")
	}

	if resp.StatusCode == http.StatusOK {
		return resp.StatusCode, resp.Body, nil
	}

	errString := ""
	requestId := resp.Header.Get(xMsServiceRequestIdHeaderName)
	switch d.(type) {
	case *blobWithMsiToken:
		switch resp.StatusCode {
		case http.StatusNotFound:
			errString = MsiDownload404ErrorString
		case http.StatusForbidden:
			errString = MsiDownload403ErrorString
		}
		break
	default:
		hostname := req.URL.Host //"string"
		switch resp.StatusCode {
		case http.StatusUnauthorized:
			errString = fmt.Sprintf("CustomScript failed to download the file from %s because access was denied. Please fix the blob permissions and try again, the response code and message returned were: %q",
				hostname,
				resp.Status)
		case http.StatusNotFound:
			errString = fmt.Sprintf("CustomScript failed to download the file from %s because it does not exist. Please create the blob and try again, the response code and message returned were: %q",
				hostname,
				resp.Status)

		case http.StatusBadRequest:
			errString = fmt.Sprintf("CustomScript failed to download the file from %s because parts of the request were incorrectly formatted, missing, and/or invalid. The response code and message returned were: %q",
				hostname,
				resp.Status)

		case http.StatusInternalServerError:
			errString = fmt.Sprintf("CustomScript failed to download the file from %s due to an issue with storage. The response code and message returned were: %q",
				hostname,
				resp.Status)
		default:
			errString = fmt.Sprintf("CustomScript failed to download the file from %s because the server returned a response code and message of %q Please verify the machine has network connectivity.",
				hostname,
				resp.Status)
		}
	}
	if len(requestId) > 0 {
		errString += fmt.Sprintf(" (Service request ID: %s)", requestId)
	}
	return resp.StatusCode, nil, fmt.Errorf(errString)
}