Webseite auto login

$USERNAME = 'USERNAME'  
$PASSWORD = 'PASSWORD'  
$WEBSITE = 'https://administrator.de/members/login.php'  

# functions loads required assemblies from nuget
function Load-NugetAssembly {
    [CmdletBinding()]
    param(
        [string]$url,
        [string]$name,
        [string]$zipinternalpath,
        [switch]$downloadonly
    )
    # Accept all TLS protocols
    [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::GetNames([System.Net.SecurityProtocolType]) 
    $localpath = @{$true=(join-path $psscriptroot $name);$false=(join-path $env:TEMP $name)}[($psscriptroot -ne '')]  
    $tmp = "$env:TEMP\$([IO.Path]::GetRandomFileName())"  
    try{
        if(!(Test-Path $localpath)){
            Add-Type -A System.IO.Compression.FileSystem
            write-host "Downloading and extracting required library '$name' ... " -F Green -NoNewline  
            (New-Object System.Net.WebClient).DownloadFile($url, $tmp)
            $zip = [System.IO.Compression.ZipFile]::OpenRead($tmp)
            $zip.Entries | ?{$_.Fullname -eq $zipinternalpath} | %{
                [System.IO.Compression.ZipFileExtensions]::ExtractToFile($_,$localpath)
            }
            write-host "OK" -F Green  
        }
        if(!$downloadonly.IsPresent){
            Add-Type -Path $localpath -EA Stop
        }
        
    }catch{
        throw "Error: $($_.Exception.Message)"  
    }finally{
        if ($zip){$zip.Dispose()}
        if(Test-Path $tmp){del $tmp -Force}
    }  
}

# load required assemblies if not already loaded
if (!('OpenQA.Selenium.Firefox.FirefoxDriver' -as [Type])){  
        Load-NugetAssembly 'https://www.nuget.org/api/v2/package/Selenium.WebDriver' -name 'WebDriver.dll' -zipinternalpath 'lib/net40/WebDriver.dll' -EA Stop  
        Load-NugetAssembly 'https://www.nuget.org/api/v2/package/Selenium.WebDriver.GeckoDriver' -name 'geckodriver.exe' -zipinternalpath 'driver/win64/geckodriver.exe' -downloadonly -EA Stop  
}

# -----------
# create driver service
$dService = [OpenQA.Selenium.Firefox.FirefoxDriverService]::CreateDefaultService()
# hide command prompt window
$dService.HideCommandPromptWindow = $true
# create firefox driver object
$ff = New-Object OpenQA.Selenium.Firefox.FirefoxDriver $dService

# set position and window size
$ff.Manage().window.Size = [System.Drawing.Size]::new(1024,768)
$ff.Manage().window.position = [System.Drawing.Size]::new(0,0)

# set page url and navigate to logon page
$ff.Url = $WEBSITE
$ff.Navigate() | out-null
# find username-, password- and logon button fields
$user = $ff.FindElementById('global-login-field')  
$pass = $ff.FindElementById('global-login-pass')  
$btnlogin = $ff.FindElementByTagName('button')  
# enter information into fields
$user.SendKeys($USERNAME)
$pass.SendKeys($PASSWORD)
# invoke click function of logon button
$btnlogin.Click()

# navigate to questions page
$ff.Url = 'https://administrator.de/forum/'  
$ff.Navigate() | out-null

# sleep some time for demo purpose
sleep 2

# then logout from page
$ff.Url = 'https://administrator.de/members/logout.php?true'  
$ff.Navigate() | out-null

# and finally quit browser
$ff.Quit()