update ddns for cloudflare

ddns-cloudflare.sh

#!/bin/bash
# 2019-03-07 | jkpark | Created

# Account and Domain

EMAIL=email@address.com
KEY=df8e92___your_global_api_key___bd5526
DOMAIN=exsample.com
A_RECORD_LIST=exsample.com,cloud.exsample.com

# Reference

IP=$(curl -s http://ipv4.icanhazip.com)
PREV_IP_FILE="/var/local/previous_ip"
LOGFILE="/var/log/ddns-cloudflare.log"

# Logger
log() {
    if [ "$1" ]; then
        echo -e "$(date +%Y.%m.%d_%H.%M.%S) $1" >> $LOGFILE
        echo -e "$(date +%Y.%m.%d_%H.%M.%S) $1"
    fi  
}

######
if [[ $1 == "-f" ]]; then
    echo "Force update..."
elif [ -f "$PREV_IP_FILE" ]; then
    PREV_IP=$(cat -s $PREV_IP_FILE)
    if [ "$IP" == "$PREV_IP" ]; then exit 0; fi
fi

echo $IP > $PREV_IP_FILE

V4ZONE="https://api.cloudflare.com/client/v4/zones"
HEADERS="-HX-Auth-Email:$EMAIL -HX-Auth-Key:$KEY -HContent-Type:application/json"
ZONE_ID=$(curl -s -X GET "$V4ZONE?name=$DOMAIN" $HEADERS | jq -r .result[0].id )

update_record() {
    RECORD_ID=$(curl -s -X GET "$V4ZONE/$ZONE_ID/dns_records?type=A&name=$1" $HEADERS | jq -r .result[0].id)
    if [ "$RECORD_ID" == "null" ]; then 
    log "Record update failed. Record '$1' does not exist."
    log "Creating a new A record : $1"
        DATA="--data {\"type\":\"A\",\"name\":\"$1\",\"content\":\"$IP\"}"
    result=$(curl -s -X POST "$V4ZONE/$ZONE_ID/dns_records" $HEADERS $DATA | jq .success)
        if [ "$result" == "true" ]; then 
            log "Record $1 is created."
        fi
    return 0;  
    fi  

    DATA="--data {\"type\":\"A\",\"name\":\"$1\",\"content\":\"$IP\"}"
    result=$(curl -s -X PUT "$V4ZONE/$ZONE_ID/dns_records/$RECORD_ID" $HEADERS $DATA | jq .success)
    if [ "$result" == "true" ]; then 
        log "Record $1 is updated."
    fi  
}

_l=$(echo $A_RECORD_LIST | tr "," "\n")
for a in $_l; do update_record $a; done