Automatos.Common

1.0.0

Functions/SSL/Get-PublicKey.ps1

function Get-PublicKey
    {
    PARAM
        (
        [Parameter(Mandatory=$true)]
        [Uri]
        $Uri,
        
        [Parameter(Mandatory=$false)]
        [string]
        $OutputFilepath
        )

    $request = [System.Net.HttpWebRequest]::Create($uri)

    try
        {
        #Make the request but ignore (dispose it) the response, since we only care about the service point
        $request.GetResponse().Dispose()
        }
    catch [System.Net.WebException]
        {
            if ($_.Exception.Status -eq [System.Net.WebExceptionStatus]::TrustFailure)
            {
                # We ignore trust failures, since we only want the certificate, and the service point is still populated at this point
            }
            else
            {
                # Let other exceptions bubble up, or write-error the exception and return from this method
                throw
            }
        }

    #The ServicePoint object should now contain the Certificate for the site.
    $servicePoint = $request.ServicePoint
    $certificate = $servicePoint.Certificate
    if($OutputFilepath){$OutputFile = New-Item -Path $OutputFilepath}
    if ($OutputFile)
        {
        $certBytes = $certificate.Export([System.Security.Cryptography.X509Certificates.X509ContentType]::Cert)
        [System.IO.File]::WriteAllBytes( $OutputFile, $certBytes )
        $OutputFile.Refresh()
        }
    else
        {$certificate}
    }