Icecast: Pull Configuration from S3

icecast-downloadxml.sh

#!/bin/sh

# This script downloads your Icecast XML script from AWS S3, compares it for changes, and reloads Icecast if changes have been found
# Written by Anthony Eden (http://mediarealm.com.au/)

file="icecast.xml"
bucket="BUCKET-NAME-GOES-HERE"
s3Key="KEY-GOES-HERE"
s3Secret="SECRET-GOES-HERE"


resource="/${bucket}/${file}"
contentType="application/xml"
dateValue="`date +'%a, %d %b %Y %H:%M:%S %z'`"

stringToSign="GET\n\n${contentType}\n${dateValue}\n${resource}"

signature=`/bin/echo -en "$stringToSign" | openssl sha1 -hmac ${s3Secret} -binary | base64`

curl -H "Host: ${bucket}.s3.amazonaws.com" \
-H "Date: ${dateValue}" \
-H "Content-Type: ${contentType}" \
-H "Authorization: AWS ${s3Key}:${signature}" \
https://${bucket}.s3.amazonaws.com/${file} \
-o $file

diff --brief icecast.xml /etc/icecast2/icecast.xml >/dev/null
comp_value=$?

if [ $comp_value -eq 1 ]
then
	# These files are different - update live config
	echo "The new file is different. Copying to the live icecast directory"
	cp /etc/icecast2/icecast.xml /etc/icecast2/icecast-backup.xml
	cp icecast.xml /etc/icecast2/icecast.xml
	
	# Restart icecast (soft restart, respecting existing connections)
	/etc/init.d/icecast2 reload
	
else
  # No change - leave as-is
	echo "The new file is unchanged. Not moving."
Fi