#!/bin/sh

## edit this
cf_ddns_host=myddns.mydomain.com
# My Profile - API Tokens - Create Token - Use template of Edit zone DNS - Zone Resources - Include - All zones - Continue to summary - Create Token
cf_token=
## edit end

# auto fetch
cf_zoneid=
cf_recordid=

servers='
http://myip.ipip.net/s
http://ipinfo.io/ip
http://ipecho.net/plain
http://members.3322.org/dyndns/getip
http://ip.sb
http://ifconfig.me
'

cfcurl(){
    curl -H "Authorization: Bearer $cf_token" -H "Content-Type: application/json" $@
}
# get root domain

get_cf_ids(){
    domain=$(curl "http://223.5.5.5/resolve?name=$cf_ddns_host&type=ns" | tr , '\n' | awk -F'"' '/Authority/{print $(NF-1)}')

    cf_zoneid=$(cfcurl "https://api.cloudflare.com/client/v4/zones?name=$domain" \
        | tr , '\n' \
        | awk -F'"' '/"id"/{print $(NF-1)}' \
        | head -1
    )

    cf_recordid=$(cfcurl -X GET "https://api.cloudflare.com/client/v4/zones/$cf_zoneid/dns_records?type=A&name=$cf_ddns_host" \
        | tr , '\n' \
        | awk -F'"' '/"id"/{print $(NF-1)}' \
        | head -1
    )

    sed -i "s/^cf_zoneid=.*$/cf_zoneid=$cf_zoneid/" $0
    sed -i "s/^cf_recordid=.*$/cf_recordid=$cf_recordid/" $0
}

for s in $servers
do
    ip=$(curl -s -m3 $s)
    [ "$ip" ] && break
done

[ "$cf_recordid" ] || get_cf_ids

cfcurl -X PUT "https://api.cloudflare.com/client/v4/zones/$cf_zoneid/dns_records/$cf_recordid" \
    --data '{"type":"A","name":"'$cf_ddns_host'","content":"'$ip'","ttl":3600,"proxied":false}'