Common Powershell Functions

Expand-Item.ps1

function Expand-Item
{
  param
  (
    [Parameter(Mandatory=$true)] [string] $zipFile,
    [Parameter(Mandatory=$true)] [string] $destinationDirectory
  )

  if (!(Test-Path -Path $zipFile -PathType Leaf))
  {
    throw ("Specified zipFile is invalid: " + $zipFile)
  }

  if (!(Test-Path -Path $destinationDirectory -PathType Container))
  {
    New-Item $destinationDirectory -ItemType Directory | Out-Null
  }

  $shell_app = new-object -com shell.application
  $zip_file = $shell_app.namespace($zipFile)
  $destination = $shell_app.namespace($destinationDirectory)
  $destination.Copyhere($zip_file.items(), 0x14)
}

Get-DownloadableFile.ps1

function Get-DownloadFile
{
    param
    (
        [Parameter(Mandatory=$true)] [string] $url,
        [Parameter(Mandatory=$true)] [string] $localPath
    )

    $localDirectory = Split-Path $localPath

    if(!(Test-Path $localDirectory))
    {
        New-Item $localDirectory -Type Directory | Out-Null
    }

    $webClient = New-Object System.Net.WebClient
    $webClient.DownloadFile($url, $localPath)
}

Test-ElevatedShell.ps1

function Test-ElevatedShell
{
	$user = [Security.Principal.WindowsIdentity]::GetCurrent()
	(New-Object Security.Principal.WindowsPrincipal $user).IsInRole([Security.Principal.WindowsBuiltinRole]::Administrator)
}