dns_add_windows_dns_server

#!/usr/bin/env bash

# Windows DNS server using powershell - dnscmd is going to be deprecated 
# Using Windows Sublinux for executing windows commands
# dnscmd command will be depricated use powershell instead

regexp='[A-z0-9]+(\.(co|com))?\.\w+$'

fulldomain=${1}
# Get root domain api.[domain|.co|.uk]
rootdomain=$(echo "${fulldomain}" | grep -Eo "${regexp}")
# Exlude root domain [api].domain.com
subdomain=$(result=$(echo "${fulldomain}" | grep -Po '(.*)(?=\.[A-z0-9]+(\.(co|com))?\.\w+$)') && if [[ ${#result} -gt 0 ]]; then echo ".${result}"; else echo ""; fi)
token=${2}

nloop=1
retries=15 # Sometimes it fails
while [[ ${nloop} -le ${retries} ]]; do

    # Add TXT record
    echo "Tries ${nloop} out of ${retries}" 
    
    echo "Adding acme challenge record for ${fulldomain} with token ${token}"
    cmd=(powershell.exe Add-DnsServerResourceRecord -DescriptiveText \'"${token}"\' -Name \'"_acme-challenge${subdomain}"\' -Txt -ZoneName \'"${rootdomain}"\' -TimeToLive 0:0:0:1)
    echo "${cmd[@]}"

    result_stderr=$({ "${cmd[@]}" ;} 2>&1)

    if [[ ${#result_stderr} -eq 0 ]]; then
        break
    else
        echo "${result_stderr}"
    fi

    nloop=$((nloop+1))

    echo "Sleeping 5 seconds"
    sleep 5
done