/* Copyright 2018 Martin Dosch
Licensed under the "MIT License" */

package main

import (
	"net/http"
	"strings"
)

// Remove tracking parameter from URLs
func removeTracking(input string) (output string, err error) {

	// Perfom a get request to get rid of 301 forwarding through
	// services like feedproxy.google.com.
	resp, err := http.Get(input)
	if err != nil {
		return input, err
	}

	// Remove the URL part starting with "?utm_", which is
	// used for tracking purposes.
	output = strings.Split(resp.Request.URL.String(), "?utm_")[0]

	// Remove the URL part starting with "?wt_", which is
	// used for Webtrekk tracking.
	output = strings.Split(output, "?wt_")[0]

	// Remove the URL part starting with "#ref=", which is
	// used for tracking the referer by some feeds.
	output = strings.Split(output, "#ref=")[0]

	// Remove the URL part starting with "?ref=", which is
	// used for tracking the referer by some feeds.
	output = strings.Split(output, "?ref=")[0]

	// Remove the URL part starting with "?pk_", which is
	// used for tracking purposes.
	output = strings.Split(output, "?pk_")[0]

	return output, err
}