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# The resource URI
$resource = ""
# Your Client ID and Client Secret obainted when registering your WebApp
$clientid = "726ec7c7-ff9e-4c28-b864-************"
$clientSecret = "KjYwt9tIf13kdBub7vaBJv4********************="
$redirectUri = "https://localhost:8001"
# UrlEncode the ClientID and ClientSecret and URL's for special characters
$clientIDEncoded = [System.Web.HttpUtility]::UrlEncode($clientid)
$clientSecretEncoded = [System.Web.HttpUtility]::UrlEncode($clientSecret)
$redirectUriEncoded = [System.Web.HttpUtility]::UrlEncode($redirectUri)
$resourceEncoded = [System.Web.HttpUtility]::UrlEncode($resource)
$scopeEncoded = [System.Web.HttpUtility]::UrlEncode("")
# Function to popup Auth Dialog Windows Form
Function Get-AuthCode {
Add-Type -AssemblyName System.Windows.Forms
$form = New-Object -TypeName System.Windows.Forms.Form -Property @{Width=440;Height=640}
$web = New-Object -TypeName System.Windows.Forms.WebBrowser -Property @{Width=420;Height=600;Url=($url -f ($Scope -join "%20")) }
$DocComp = {
$Global:uri = $web.Url.AbsoluteUri
if ($Global:uri -match "error=[^&]*|code=[^&]*") {$form.Close() }
$web.ScriptErrorsSuppressed = $true
$form.ShowDialog() | Out-Null
$queryOutput = [System.Web.HttpUtility]::ParseQueryString($web.Url.Query)
$output = @{}
foreach($key in $queryOutput.Keys){
$output["$key"] = $queryOutput[$key]
# Get AuthCode
$url = "$redirectUriEncoded&client_id=$clientID&resource=$resourceEncoded&prompt=admin_consent&scope=$scopeEncoded"
# Extract Access token from the returned URI
$regex = '(?<=code=)(.*)(?=&)'
$authCode = ($uri | Select-string -pattern $regex).Matches[0].Value
Write-output "Received an authCode, $authCode"

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Nilis312 commented Jun 13, 2017

Hi Darren,

I got the error message:
Unable to find type [System.Web.HttpUtility].

  • $queryOutput = [System.Web.HttpUtility]::ParseQueryString($web.Ur ...
  •                ~~~~~~~~~~~~~~~~~~~~~~~~
    • CategoryInfo : InvalidOperation: (System.Web.HttpUtility:TypeName) [], RuntimeException
    • FullyQualifiedErrorId : TypeNotFound

After adding "Add-Type -AssemblyName System.Web" at the beginning of the PowerShell script is started to work.
Running Windows 10 Creators update + .net 4.7.

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