#!/bin/bash
## change to "bin/sh" when necessary

cf_email=$1
cf_apikey=$2
cf_record=$3
cf_zoneid=$4

talk_roomuri=$5
talk_username=$6
talk_token=$7


auth_email=$cf_email                               # The email used to login 'https://dash.cloudflare.com'
auth_method="token"                                # Set to "global" for Global API Key or "token" for Scoped API Token 
auth_key=$cf_apikey                                # Your API Token or Global API Key
zone_identifier=$cf_zoneid                         # Can be found in the "Overview" tab of your domain
record_name=$cf_record                             # Which record you want to be synced
ttl="3600"                                         # Set the DNS TTL (seconds)
proxy=true                                         # Set the proxy to true or false
talkroomuri=$talk_roomuri                          # URI for nextcloud talk webhook "https://nextcloud.holzeis.me/ocs/v2.php/apps/spreed/api/v1/chat/xxxxx"
talkusername=$talk_username                        # Webhook user name (needs to be moderator of chat)
talktoken=$talk_token                              # API Token for user name


###########################################
## Check if we have a public IP
###########################################
ip=$(curl -s https://api.ipify.org || curl -s https://ipv4.icanhazip.com/)

if [ "${ip}" == "" ]; then 
  logger -s "DDNS Updater: No public IP found"
  exit 1
fi

###########################################
## Check and set the proper auth header
###########################################
if [ "${auth_method}" == "global" ]; then
  auth_header="X-Auth-Key:"
else
  auth_header="Authorization: Bearer"
fi

###########################################
## Seek for the A record
###########################################

logger "DDNS Updater: Check Initiated"
record=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?type=A&name=$record_name" \
                      -H "X-Auth-Email: $auth_email" \
                      -H "$auth_header $auth_key" \
                      -H "Content-Type: application/json")

###########################################
## Check if the domain has an A record
###########################################
if [[ $record == *"\"count\":0"* ]]; then
  logger -s "DDNS Updater: Record does not exist, perhaps create one first? (${ip} for ${record_name})"
  exit 1
fi

###########################################
## Get existing IP
###########################################
old_ip=$(echo "$record" | sed -E 's/.*"content":"(([0-9]{1,3}\.){3}[0-9]{1,3})".*/\1/')
# Compare if they're the same
if [[ $ip == $old_ip ]]; then
  logger "DDNS Updater: IP ($ip) for ${record_name} has not changed."
  exit 0
fi

###########################################
## Set the record identifier from result
###########################################
record_identifier=$(echo "$record" | sed -E 's/.*"id":"(\w+)".*/\1/')

###########################################
## Change the IP@Cloudflare using the API
###########################################
update=$(curl -s -X PATCH "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record_identifier" \
                     -H "X-Auth-Email: $auth_email" \
                     -H "$auth_header $auth_key" \
                     -H "Content-Type: application/json" \
              --data "{\"type\":\"A\",\"name\":\"$record_name\",\"content\":\"$ip\",\"ttl\":\"$ttl\",\"proxied\":${proxy}}")

###########################################
## Report the status
###########################################
case "$update" in
*"\"success\":false"*)
  logger -s "DDNS Updater: $ip $record_name DDNS failed for $record_identifier ($ip). DUMPING RESULTS:\n$update"
  if [[ $talkroomuri != "" ]]; then

    curl -L -X POST $talkroomuri \
     -H "Content-Type: application/json" \
     -H "OCS-APIRequest: true" \
     -u "'$talkusername':'$talktoken'"
    --data-raw '{
      "message": "DDNS Update Failed: '$record_name': '$record_identifier' ('$ip')."
      }'
  fi
  exit 1;;
*)
  logger "DDNS Updater: $ip $record_name DDNS updated."
  if [[ $talkroomuri != "" ]]; then
    curl -L -X POST $talkroomuri \
    -H "Content-Type: application/json" \
    -H "OCS-APIRequest: true" \
    -u "'$talkusername':'$talktoken'"
    --data-raw '{
      "message" : "Updated: '$record_name''"'"'s'""' new IP Address is '$ip'"
    }'
  fi
  exit 0;;
esac