M bin/scripts/update_home_dns.sh → bin/scripts/update_home_dns.sh

@@ -1,79 +1,40 @@ 
 #!/bin/bash
 #
-# This is a script to update a Netlify subdomain A record with the current external IP.
-# The example below would update the local.example.com A record to the current external IP with a TTL of 5 minutes.
-#
-# Usage:
-# netlify-ddns.sh <ACCESS_TOKEN> <DOMAIN> <SUBDOMAIN> <TTL>
-#
-# Example:
-# netlify-ddns.sh aCcEsStOKeN example.com local 300
-#
-# if [ "$#" -ne 4 ]; then
-#     echo "Wrong number of parameters passed"
-#     echo "Usage:"
-#     echo "$0 <ACCESS_TOKEN> <DOMAIN> <SUBDOMAIN> <TTL>"
-#     exit
-# fi
-
-# ACCESS_TOKEN="$1"
-# DOMAIN="$2"
-# SUBDOMAIN="$3"
-# TTL="$4"
-
-ACCESS_TOKEN="$NETLIFY_ACCESS_TOKEN"
-DOMAIN="prithu.xyz"
-SUBDOMAIN="$SUBDOMAIN_"
-TTL="5"
+# a quick dirty script to update a specific dns record using netlify api
+# could spend some time later improving it and making it robust
+# set env variables DNS_HOSTNAME_ and NETLIFY_ACCESS_TOKEN_
 
-NETLIFY_API="https://api.netlify.com/api/v1"
+netlify_api="https://api.netlify.com/api/v1"
+token="$D_NETLIFY_ACCESS_TOKEN"
+hostname="$D_HOSTNAME"
+domain=$(echo -n $hostname | cut -d'.' -f2-3)
 
 ping -q -c 1 ifconfig.io >/dev/null || exit
-EXTERNAL_IP=`curl -s ifconfig.io`
+IP=`curl -s ifconfig.io`
 
-#EXTERNAL_IP=`dig +short myip.opendns.com @resolver1.opendns.com`
-echo "Current external IP is $EXTERNAL_IP"
+echo "Fetching records"
 
-HOSTNAME="$SUBDOMAIN.$DOMAIN"
+dns_zones=`curl -s "$netlify_api/dns_zones?access_token=$token" --header "Content-Type:application/json"`
+zone_id=`echo $dns_zones | jq ".[]  | select(.name == \"$domain\") | .id" --raw-output`
+record=$(curl -s "$netlify_api/dns_zones/$zone_id/dns_records?access_token=$token" --header "Content-Type:application/json" | jq ".[]  | select(.hostname == \"$hostname\")" --raw-output)
+record_val=`echo $record | jq ".value" --raw-output`
+record_id=`echo $record | jq ".id" --raw-output`
 
-DNS_ZONES_RESPONSE=`curl -s "$NETLIFY_API/dns_zones?access_token=$ACCESS_TOKEN" --header "Content-Type:application/json"`
-ZONE_ID=`echo $DNS_ZONES_RESPONSE | jq ".[]  | select(.name == \"$DOMAIN\") | .id" --raw-output`
-DNS_RECORDS_RESPONSE=`curl -s "$NETLIFY_API/dns_zones/$ZONE_ID/dns_records?access_token=$ACCESS_TOKEN" --header "Content-Type:application/json"`
-RECORD=`echo $DNS_RECORDS_RESPONSE | jq ".[]  | select(.hostname == \"$HOSTNAME\")" --raw-output`
-RECORD_VALUE=`echo $RECORD | jq ".value" --raw-output`
-echo "Current $HOSTNAME value is $RECORD_VALUE"
+if [[ "$record_val" != "$IP" ]]; then
 
-if [[ "$RECORD_VALUE" != "$EXTERNAL_IP" ]]; then
+  # delete the record first
+  [[ $record_val -ne "" ]] && curl -X DELETE -s "$netlify_api/dns_zones/$zone_id/dns_records/$record_id?access_token=$token" --header "Content-Type:application/json"
 
-  if [[ "$RECORD_VALUE" != "" ]]; then
-    echo "Deleting current entry for $HOSTNAME"
-    RECORD_ID=`echo $RECORD | jq ".id" --raw-output`
-    DELETE_RESPONSE_CODE=`curl -X DELETE -s -w "%{response_code}" "$NETLIFY_API/dns_zones/$ZONE_ID/dns_records/$RECORD_ID?access_token=$ACCESS_TOKEN" --header "Content-Type:application/json"`
+  body=$(cat <<EOF
+{
+  "type": "A",
+  "hostname": "$hostname",
+  "value": "$IP",
+  "ttl": 5
+}
+EOF
+  )
 
-    if [[ $DELETE_RESPONSE_CODE != 204 ]]; then
-      echo "There was a problem deleting the existing $HOSTNAME entry, response code was $DELETE_RESPONSE_CODE"
-      exit
-    fi
-  fi
-
-  echo "Creating new entry for $HOSTNAME with value $EXTERNAL_IP"
-  CREATE_BODY=`jq -n --arg hostname "$HOSTNAME" --arg externalIp "$EXTERNAL_IP" --arg ttl $TTL '
-  {
-      "type": "A",
-      "hostname": $hostname,
-      "value": $externalIp,
-      "ttl": $ttl|tonumber
-  }'`
-
-  CREATE_RESPONSE=`curl -s --data "$CREATE_BODY" "$NETLIFY_API/dns_zones/$ZONE_ID/dns_records?access_token=$ACCESS_TOKEN" --header "Content-Type:application/json"`
-
-  NEW_RECORD_TYPE=`echo $CREATE_RESPONSE | jq ".type" --raw-output`
-  NEW_RECORD_HOSTNAME=`echo $CREATE_RESPONSE | jq ".hostname" --raw-output`
-  NEW_RECORD_VALUE=`echo $CREATE_RESPONSE | jq ".value" --raw-output`
-  NEW_RECORD_TTL=`echo $CREATE_RESPONSE | jq ".ttl" --raw-output`
-
-  if [[ $NEW_RECORD_TYPE != "A" ]] || [[ $NEW_RECORD_HOSTNAME != $HOSTNAME ]] || [[ $NEW_RECORD_VALUE != $EXTERNAL_IP ]] || [[ $NEW_RECORD_TTL != $TTL ]]; then
-    echo "There was a problem creating the new entry, some values did not match"
-    exit
-  fi
+  echo "Setting new record"
+  response=$(curl -s --data "$body" "$netlify_api/dns_zones/$zone_id/dns_records?access_token=$token" --header "Content-Type:application/json")
 fi