Anonymously open a redirecting URL to mitigate tracking.

anonredirect.sh

#!/bin/sh

# Anonymously open a redirecting URL to mitigate tracking.
# Uses http://labs.wis.nu/ua/ to retrieve a random user agent string.
# Requires a local tor SOCKS5 proxy and Python 3.

anonredirect()
{
	origURL=$1
	proxyPort=9050
	randomUA=$(python3 -c "import urllib.request;import json;print(json.loads(urllib.request.urlopen('http://labs.wis.nu/ua/').read().decode('UTF-8'))['ua'])")

	proxyUp=$(netstat -an | grep $proxyPort)

	if [ "$proxyUp" = '' ]; then
		echo "Error: Proxy is not running on port $proxyPort." >&2
		exit 1
	fi

	url=$(curl --socks5-hostname 127.0.0.1:9050 -A "$randomUA" -s -I "$origURL" | sed -n -e 's/Location:[[:space:]]\(.*\)$/\1/p')

	# Assume URL to start with http, so "open" passes it to a web browser
	if [ ! "${url%${url#http}}" = 'http' ]; then
		origURL=http://$url
	fi

	echo $url
}

openurl()
{
	uname=$(uname)

	if [ "$uname" = "Linux" ]; then
		xdg-open "$1"
	elif [ "$uname" = "Darwin" ]; then
		open "$1"
	fi
}

openurl $(anonredirect $1)