Spotify adblock host entries

spotiblock.sh

#!/bin/bash

HOSTS_FILE="/etc/hosts"

# check if we are root
USER_ID=`id -u`
if [ "$USER_ID" != '0' ]; then
	echo "This script must be run with root permissions, try again."
	exit 1
fi

ENTRIES="# spotiblock.sh start
# Spotify adblock entries
127.0.0.1 media-match.com
127.0.0.1 adclick.g.doublecklick.net
127.0.0.1 www.googleadservices.com
127.0.0.1 open.spotify.com
127.0.0.1 pagead2.googlesyndication.com
127.0.0.1 desktop.spotify.com
127.0.0.1 googleads.g.doubleclick.net
127.0.0.1 pubads.g.doubleclick.net
127.0.0.1 securepubads.g.doubleclick.net
127.0.0.1 audio2.spotify.com
127.0.0.1 www.omaze.com
127.0.0.1 omaze.com
127.0.0.1 bounceexchange.com
127.0.0.1 core.insightexpressai.com
127.0.0.1 content.bitsontherun.com
127.0.0.1 s0.2mdn.net
127.0.0.1 v.jwpcdn.com
127.0.0.1 d2gi7ultltnc2u.cloudfront.net
127.0.0.1 crashdump.spotify.com
127.0.0.1 adeventtracker.spotify.com
127.0.0.1 log.spotify.com
127.0.0.1 analytics.spotify.com
127.0.0.1 ads-fa.spotify.com
# spotiblock.sh end"

# check if the script has already been applied
updated_entries=false
result=`cat $HOSTS_FILE | grep "spotiblock.sh"`
if [ "$result" != '' ]; then
	old_buf=""
	read_block=false
	while read -r line; do
		if [ "$line" == "# spotiblock.sh start" ]; then
			read_block=true
		elif [ "$line" == "# spotiblock.sh end" ]; then
			old_buf="$old_buf$line"
			break
		fi
		if [ $read_block == true ]; then
			old_buf="$old_buf$line"$'\n'
		fi
	done < $HOSTS_FILE

	if [ "$old_buf" == "$ENTRIES" ] && [ "$1" != "-f" ]; then
		echo "spotiblock.sh has already been run, entries are up to date."
		echo "If you really want to run again, force execution using -f."
		exit 0
	fi

	echo "spotiblock.sh has already been run, updating entries."
	echo "difference (new+ vs old-):"
	diff -u <(echo "$old_buf") <(echo "$ENTRIES")
	remove_line=false
	while read -r line; do
		if [ "$line" == "# spotiblock.sh start" ]; then
			remove_line=true
		elif [ "$line" == "# spotiblock.sh end" ]; then
			sed -i '' "/$line/d" $HOSTS_FILE
			break
		fi
		if [ $remove_line == true ]; then
			sed -i '' "/$line/d" $HOSTS_FILE
		fi
	done < $HOSTS_FILE
	updated_entries=true
fi

# write entries to hosts file
if [ $updated_entries == false ]; then
	ENTRIES=$'\n'"$ENTRIES"
fi
echo "$ENTRIES" >> $HOSTS_FILE

# check if entries were written successfully
result=`cat $HOSTS_FILE | grep "spotiblock.sh"`
if [ "$result" == '' ]; then
	echo "Could not add adblock entries to $HOSTS_FILE!"
	exit 1
fi

echo "Spotify adblock entries successfully written to $HOSTS_FILE!"
exit 0