download file powershell

download-file.ps1

$ErrorActionPreference = "Stop"

function Invoke-DownloadFileCore{
    param(
        [string]$url, 
        [string]$output, 
        [bool]$skipTlsValidation, 
        [X509Certificate]$certificate)
$code = @'
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;

public class TrustAllCertsUtility
{
     public static Func<HttpRequestMessage,X509Certificate2,X509Chain,SslPolicyErrors,Boolean> ValidationCallback = 
        (message, cert, chain, errors) => {                
            return true; 
     };        
}

'@    
    Add-Type $code
    $handler = [System.Net.Http.HttpClientHandler]::new()
    if ($skipTlsValidation){
        $handler.ServerCertificateCustomValidationCallback = [TrustAllCertsUtility]::ValidationCallback
    }
    $client = [System.Net.Http.HttpClient]::new($handler)
    
    $result = $client.GetAsync($url).Result
    if (-not ($result.IsSuccessStatusCode)){
        throw [System.Exception] "Invalid response code. Expected 200 found $($result.StatusCode)"
    }
    $file = [System.IO.File]::Create($output)
    $task = $result.Content.CopyToAsync($file)
    $task.Result | Out-Null
    $file.Close()    
}

function Invoke-DownloadFileDesktop{
param(
    [string]$url, 
    [string]$output, 
    [bool]$skipTlsValidation, 
    [X509Certificate]$certificate)
    add-type @"
using System.Net;
using System.Security.Cryptography.X509Certificates;
public class TrustAllCertsPolicy : ICertificatePolicy {
    public bool CheckValidationResult(
        ServicePoint srvPoint, X509Certificate certificate,
        WebRequest request, int certificateProblem) {
        return true;
    }
}
"@
    $AllProtocols = [System.Net.SecurityProtocolType]'Ssl3,Tls,Tls11,Tls12'
    [System.Net.ServicePointManager]::SecurityProtocol = $AllProtocols
    [System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy
    $wc = New-Object System.Net.WebClient
    $wc.DownloadFile($url, $output)
}

function Invoke-DownloadFile{
    param(
        [string]$url, 
        [string]$output, 
        [bool]$skipTlsValidation, 
        [X509Certificate]$certificate)
    if ($PSEdition -eq 'Core'){
        return Invoke-DownloadFileCore -url $url -output $output -skipTlsValidation $skipTlsValidation -certificate $certificate
    }
    return Invoke-DownloadFileDesktop -url $url -output $output -skipTlsValidation $skipTlsValidation -certificate $certificate
}

Invoke-DownloadFile -url "https://packages.cloudfoundry.org/stable?release=windows64-exe&version=6.37.0&source=github-rel" -output "/tools/cf.zip"