PortForward.ps1

Add-Type -AssemblyName System.Web
$hostPort = 8080
$guestPort = 443

# Not using $env:USERNAME because this script needs to run as an administrator, and the username at that point will likely be different than the logged in user, at least within an Active Directory domain environment. 
# This function will instead get the current logged in user and strip the domain from the username. If you didn't strip the domain, the output would be DOMAIN\username
#
# To easily make this usuable outside of an AD domain, you can probably just delete this function and change $(loggedInUser) to $env:USERNAME within the 'Set-Ports' function.
function Get-LoggedInUser($loggedInUser) {
  (Get-WMIObject -class Win32_ComputerSystem | Select-Object -ExpandProperty UserName | Out-String).trim("$env:USERDOMAIN\").trim()
}

function Test-Config {
  $checkPorts = Invoke-Expression "netsh interface portproxy show v4tov4 listenport=$hostPort listenaddress=0.0.0.0"
  # When there is a configuration present, $checkPortsWithSpecialCharacters will return System.Object[]
  # There was no other way I could figure out to test if a config was present because
  # without the HtmlEncode method, $checkPorts was returning an empty string no matter what
  $checkPortsWithSpecialCharacters = [System.Web.HttpUtility]::HtmlEncode($checkPorts)
  if ($checkPortsWithSpecialCharacters -eq "") {
    Write-Host
    Write-Host -ForegroundColor Green "No existing configuration to clear"
    Write-Host
  }
  else {
    Write-Host
    Write-Host -ForegroundColor Yellow "Clearing previous configuration"
    Write-Host
    Invoke-Expression "netsh interface portproxy delete v4tov4 listenport=$hostPort listenaddress=0.0.0.0" >$null
  }
}

function Set-Ports {
  $filePath = $filePath = "C:\Users\$(loggedInUser)\.wslip"
  if (Test-Path $filePath -PathType Leaf) {
    Write-Host -ForegroundColor Green "Found WSL IP: $(Get-Content $filePath)in $filePath"
    Invoke-Expression "netsh interface portproxy add v4tov4 listenport=$hostPort listenaddress=0.0.0.0 connectport=$guestPort connectaddress=$(Get-Content $filePath)" -ErrorVariable SetPortsError
  }
  else {
    Write-Host -ForegroundColor Red "Could not find WSL IP in $filePath."
    Break
  }
    Write-Host
    Write-Host -ForegroundColor Yellow "Your new configuration:"
    Write-Host
    Invoke-Expression "netsh interface portproxy show v4tov4" | Write-Host -ForegroundColor Yellow
    Write-Host
    Write-Host
}

Test-Config

Set-Ports

Read-Host -Prompt "Press Enter to exit"