Gets the most recent thumbprint of a TLS certificate on a Windows host for use within Octopus Deploy processes.

TlsThumbprintForOctopusUse.ps1

function FindTlsThumbprintToUse
{
    param(
        [String]$VariableName = "TlsThumbprint"
    )
    
    $thumbprint = Get-ChildItem -Path cert:\LocalMachine\My\* -EKU "Server Authentication" |
        Where-Object { 
            # The last where, for -eq $true helps avoid returning a null object in some cases.
            $_.DnsNameList -and ($_.DnsNameList.punycode.endswith(".yourtlddomain.here") | Where-Object { $_ -eq $true })
        } |
        Sort-Object notbefore -desc |
        Select-Object -Last 1 -ExpandProperty thumbprint
    if ($thumbprint) {
        Set-OctopusVariable -name $VariableName -value $thumbprint
        Write-Host "Setting variable named $variableName with the thumbprint of $thumbprint"
    }
}