Shell script using AWS Cli to purge a CloudFront distribution, by id or by public aliases CNAME

purge-cdn.sh

#!/bin/sh
# Always checkout last version from https://github.com/D4UDigitalPlatform/cloudscripts/tree/master/aws/scripts/cloudfront
show_help() {
cat << EOF
Usage:
    ${0##*/} [--verbose]  [--cloudfrontid CLDFID] [--cname CNAME] [--list]

Purge a CloudFront distribution.

options :
--verbose             : add more information
--cloudfrontid CLDFID : id of the distribution to purge
--cname CNAME         : hostname to purge (ex : www.example.com), will purge the distribution associated to this hostname.
--list                : list distribution

EOF
}


print_step() {
    echo "==================="
    echo "$1"
    echo "==================="
}

list_distribution() {
	aws  cloudfront list-distributions --query 'DistributionList.Items[*].{Id:Id,Status:Status,DomainName:DomainName,ARN:ARN,Aliases:Aliases.Items[*]}' --output table
}

VERBOSE="0"
CLOUDFRONTID=""
CNAME=""

while [[ $1 == * ]]; do
    case "$1" in
	-h|--help)
		show_help
		exit 0
		;;
    --verbose)
        VERBOSE=1
        ;;
	--list)
		list_distribution
		exit
		;;
    --cloudfrontid)
        CLOUDFRONTID="$2"
		shift
		;;
	--cname)
        CNAME="$2"
		shift
		;;
    *)
        shift
        break
        ;;
	esac
		shift
done

if [[ "$CLOUDFRONTID" == "" && "$CNAME" == "" ]]; then
	show_help
	exit 1
fi

if [[ "$CNAME" != "" ]]; then
	CLOUDFRONTID=$(aws cloudfront list-distributions --query "DistributionList.Items[?Aliases.Items!=null] | [?contains(Aliases.Items, '$CNAME')].Id | [0]")
	if [[ "$CLOUDFRONTID" == "" || "$CLOUDFRONTID" == "null" ]]; then
		echo "Unable to find a distribution with a CNAME named $CNAME".
		echo "Here are the availble distributions with CNAME :"
		list_distribution
		exit 1
	fi
	temp="${CLOUDFRONTID%\"}"
	temp="${temp#\"}"
	CLOUDFRONTID=$temp
	echo "CNAME $CNAME match with distribution $CLOUDFRONTID"
fi

aws configure set preview.cloudfront true
aws cloudfront create-invalidation --distribution-id $CLOUDFRONTID --paths '/*' --output text || exit 1