#!/usr/bin/env bash
set -e

# Not needed but useful to know
function aws_ip_check {

    aws route53 list-resource-record-sets --hosted-zone-id $HOSTED_ZONE_ID \
	--query "ResourceRecordSets[?(Name == 'senders.io.' && Type == 'A')].ResourceRecords[0].Value | [0]" --output text
}

if [ $# -lt 1 ]; then
    echo "Usage: ./update.sh HOSTED_ZONE_ID DOMAIN
       ./update.sh CONFIG_FILE
"
    exit 1
fi
if [ $# -eq 1 ]; then
    source $1
fi
if [ $# -eq 2 ]; then
    HOSTED_ZONE_ID=$1
    DOMAIN=$2
fi
RECORD_CHANGE_JSON=/tmp/aws-ip-update.json

# Fetch IPs

config_ip=$(dig +short $DOMAIN)
actual_ip=$(curl -s https://ipinfo.io/ip)

if [ "$config_ip" != "$actual_ip" ]; then
    echo "Updating IP from $config_id to $actual_ip for $DOMAIN"
    cat <<EOF > $RECORD_CHANGE_JSON
{
  "Changes": [
    "Action": "UPSERT",
    "ResourceRecordSet": {
      "Name": "$DOMAIN",
      "Type": "A",
      "TTL": 300,
      "ResourceRecords": [
        "Value": "$actual_ip"
      ]
    }
  ]
}
EOF
    aws route53 change-resource-record-sets --hosted-zone-id $HOSTED_ZONE_ID \
	--change-batch $RECORD_CHANGE_JSON
    
else
    echo "$DOMAIN is currently registered properly: $config_ip $actual_ip"
fi

exit 0