cloudflare-dns.ps1

function log ([string]$logdata){
	$logfile = "c:\temp\Cloudflare-dns.log"
	$date = get-date
	Write-Output  "$date - $logdata" | Out-File $logfile -width 240 -Append
}


$headers = @{
        'X-Auth-Key' = 'key';
        'X-Auth-Email' = 'email';
        'Content-Type' = 'application/json'
    }


$ZoneRecords = @(
'my.dns.com, that.dns.com'

)

[string]$Zone = 'dns.com';
[string]$cloudFlareApiBaseUrl = 'https://api.cloudflare.com/client/v4';
[string]$public_IP='';



# Get Zone ID from cloudflare
    try 
    {
        $request = Invoke-WebRequest -Uri "${cloudFlareApiBaseUrl}/zones/?name=${Zone}" -Method 'GET' -Headers $headers
    }
    catch
    {
        $MyError = $_
        Throw $MyError
    }
    $zoneId = $(ConvertFrom-Json $request.Content).result[0].id


#Lookup external ip
    try 
    {
        $public_IP = (Invoke-RestMethod https://api.ipify.org?format=json).ip.trim()
    }
    catch
    {
        $MyError = $_
        Throw $MyError
    }
     

Foreach ($Element IN $ZoneRecords) {

    #GET record info from cloudflare
    #$Recordweb = Invoke-WebRequest -Uri "${cloudFlareApiBaseUrl}/zones/${ZoneId}/dns_records/?name=${Element}" -Method 'GET' -Headers $headers
    try 
    {
        $Record = Invoke-RestMethod -Uri "${cloudFlareApiBaseUrl}/zones/${ZoneId}/dns_records/?name=${Element}" -Method 'GET' -Headers $headers -ContentType 'application/json'   
    }
    catch
    {
        $MyError = $_
        Throw $MyError
    }
    
    #When using webrequest need to convert from jason
    #$Record_ID = $(ConvertFrom-Json $Record.Content).result[0].id
    #$Record_IP = $(ConvertFrom-Json $Record.Content).result[0].content
    $Record_ID = $Record.result[0].id
    $Record_IP = $Record.result[0].content
    
    if ($Record_IP -ne $public_IP) {

        write-host "Changing from $Record_IP to new $public_IP"
        log "Changing from $Record_IP to new $public_IP"        
       

        $Data = @{
        'id' = "${Record_ID}";
        'type' = 'A';
        'name' = "${Element}";
        'content' = "${public_IP}";
        }
    
        # If it exists, UPDATE (PUT), if not, CREATE (POST)
        [string]$method = 'PUT';
        if ($Record.result.Count -eq 0) {
            $method = 'POST';
            $Data.Remove('id');
        }

        $DataJson = ConvertTo-Json $Data

        try 
        {
            $JSONResponse = Invoke-RestMethod -Uri "${cloudFlareApiBaseUrl}/zones/${ZoneId}/dns_records/${Record_ID}/" -Headers $Headers -Body $DataJson -Method "${method}" -ContentType 'application/json' -ErrorAction Stop
        }
        catch
        {
            $MyError = $_
            Throw $MyError
        }
       
    }
}