cloudflare dyndns script / update a A and AAAA record using bash script

cloudflare-dyndns-a-aaaa-record-update.sh

#!/bin/bash

# Author: Jari Pennanen
# Url: https://gist.github.com/Ciantic/4e543f2d878a87a38c25032d5c727bf2

# create your API Key at https://dash.cloudflare.com/profile/api-tokens
# Required permissions: Zone Settings:Read, Zone:Read, DNS:Edit (all under zone)
AUTH_KEY="" # Get this from My profile -> API Keys -> View
DOMAIN="example.com" # main domain
SUBDOMAIN="home.example.com" # set A and AAAA-record of this subdomain

ZONE_ID=$(\
    curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$DOMAIN&status=active" \
        -H "Authorization: Bearer $AUTH_KEY" \
        -H "Content-Type: application/json" \
     | \
        python3 -c "import sys, json; print(json.load(sys.stdin)['result'][0]['id'])" \
)
if [[ -z "$ZONE_ID" ]]; then
    echo "Zone ID can't be determined" 1>&2
    exit 1
fi
echo "Zone ID:" $ZONE_ID

RECORD_IPV4_ID=$(\
    curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records?type=A&name=$SUBDOMAIN" \
        -H "Authorization: Bearer $AUTH_KEY" \
        -H "Content-Type: application/json" \
    | \
        python3 -c "import sys, json; print(json.load(sys.stdin)['result'][0]['id'])" \
)
if [[ -z "$RECORD_IPV4_ID" ]]; then
    echo "Record ID can't be determined" 1>&2
    exit 1
fi
echo "A-Record ID:" $RECORD_IPV4_ID

RECORD_IPV6_ID=$(\
    curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records?type=AAAA&name=$SUBDOMAIN" \
        -H "Authorization: Bearer $AUTH_KEY" \
        -H "Content-Type: application/json" \
    | \
        python3 -c "import sys, json; print(json.load(sys.stdin)['result'][0]['id'])" \
)
if [[ -z "$RECORD_IPV6_ID" ]]; then
    echo "Record ID can't be determined" 1>&2
    exit 1
fi
echo "AAAA-Record ID:" $RECORD_IPV6_ID

# curl -s -4 https://ifconfig.co/ip \
IPV4_ADDRESS=$(\
    curl -s https://ipv4.icanhazip.com \
)
if [[ -z "$IPV4_ADDRESS" ]]; then
    echo "IPV4 Address can't be determined" 1>&2
    exit 1
fi

# curl -s -6 https://ifconfig.co/ip \
IPV6_ADDRESS=$(\
    curl -s https://ipv6.icanhazip.com \
)
if [[ -z "$IPV6_ADDRESS" ]]; then
    echo "IPV6 Address can't be determined" 1>&2
    exit 1
fi

echo "IP Address: " $IPV4_ADDRESS " / " $IPV6_ADDRESS


# Note: TTL=1 automatic
IPV4_UPDATE_RESULT=$(\
    curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$RECORD_IPV4_ID" \
        -H "Authorization: Bearer $AUTH_KEY" \
        -H "Content-Type: application/json" \
        --data '{"type":"A","name":"'"$SUBDOMAIN"'","content":"'"$IPV4_ADDRESS"'","ttl":1,"proxied":false}' \
    | \
        python3 -c "import sys, json; print(json.load(sys.stdin)['success'])" \
)
     
if [[ "$IPV4_UPDATE_RESULT" -ne "True" ]]; then
    echo "IPV4 Address can't be set" 1>&2
    exit 1
fi

IPV6_UPDATE_RESULT=$(\
    curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$RECORD_IPV6_ID" \
        -H "Authorization: Bearer $AUTH_KEY" \
        -H "Content-Type: application/json" \
        --data '{"type":"AAAA","name":"'"$SUBDOMAIN"'","content":"'"$IPV6_ADDRESS"'","ttl":1,"proxied":false}' \
    | \
        python3 -c "import sys, json; print(json.load(sys.stdin)['success'])" \
)


if [[ "$IPV6_UPDATE_RESULT" -ne "True" ]]; then
    echo "IPV6 Address can't be set" 1>&2
    exit 1
fi