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#! /bin/bash
# Work with DigitalOcean api to update "A" record for a domain.
# Store DigitalOcean API token in file : DIGITALOCEAN_TOKEN
# Store domain to be updated in file : DIGITALOCEAN_DOMAIN
SCRIPT="${BASH_SOURCE[0]}"
SCRIPT_DIR=$(builtin cd "${SCRIPT%/*}" && pwd )
SCRIPT_NAME=${SCRIPT##*/}
REPEAT_CHECK_DIR=$HOME/repeat_check
REPEAT_CHECK=$REPEAT_CHECK_DIR/$SCRIPT_NAME # file to save argument in if successful
DIGITALOCEAN_DOMAIN=`cat $SCRIPT_DIR/DIGITALOCEAN_DOMAIN`
DIGITALOCEAN_TOKEN=`cat $SCRIPT_DIR/DIGITALOCEAN_TOKEN`
# Get IP from command line if available. Otherwise use curl to get public IP.
IP=""
if [ "$#" == "1" ]; then
IP=$1
else
IP=`curl -4 icanhazip.com 2> /dev/null`
fi
# If $IP does not look like a valid address then complain and exit.
# For regular expression, thank you to : https://tecadmin.net/shell-script-validate-ipv4-addresses/
if ! [[ $IP =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
echo Invalid IP address format: $IP
exit
fi
get_a_record_ids() {
curl -X GET \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
"https://api.digitalocean.com/v2/domains/$DIGITALOCEAN_DOMAIN/records" 2> /dev/null | jq '.domain_records | map(select(.type == "A" and .name == "@")) | map(.id) | .[]'
}
add_a_record() {
curl -X POST \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
-d "{\"type\":\"A\" \
,\"name\":\"@\" \
,\"data\":\"$IP\" \
,\"priority\":null \
,\"port\":null \
,\"ttl\":1800 \
,\"weight\":null \
,\"flags\":null \
,\"tag\":null \
}" \
"https://api.digitalocean.com/v2/domains/$DIGITALOCEAN_DOMAIN/records" 2> /dev/null | jq '.domain_record.id'
}
delete_record_by_id() {
echo deleting existing A record for $DIGITALOCEAN_DOMAIN
curl -X DELETE \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
"https://api.digitalocean.com/v2/domains/$DIGITALOCEAN_DOMAIN/records/$1" > /dev/null 2>&1
}
replace_a_record() {
for id in `get_a_record_ids`; do
delete_record_by_id $id
done
new_record_id=`add_a_record`
if [ "$new_record_id" == "null" ] ; then
echo unable to add new A record for $DIGITALOCEAN_DOMAIN with value : $1
return 1
fi
echo added new A record for $DIGITALOCEAN_DOMAIN with value : $1
}
# exit if previous successful call was with same argument
if [[ -e $REPEAT_CHECK ]]; then
PREVIOUS_IP=`cat $REPEAT_CHECK`
if [[ "$IP" == "$PREVIOUS_IP" ]]; then
echo previous update was also with argument: \"$IP\" so exiting now to avoid duplicate work.
exit
fi
fi
# attempt to replace A record and, if successful, save arguments to check against next time
if replace_a_record $IP; then
# if successful then save arguments.
echo update worked so saving arguments \"$IP\" in $REPEAT_CHECK
mkdir -p $REPEAT_CHECK_DIR
echo "$IP" > $REPEAT_CHECK
fi
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