Monitor-Defacement.ps1

cls
$url = 'https://www.google.com'
$retryInterval = 2
$c = 1

function Get-Response
{
    param($url)
    Write-Progress -Activity "attempt number #$c" -Status $url
    
    $response = Invoke-WebRequest $url `
        -Headers @{
                'Cache-Control'='no-cache'
                'User-Agent' = 'xtr-cwp-defmon'
                'x-defmonmonitor' = ("xtr-cwp-defmon?t=" + (Get-Date -f 'yyyyMMddHHmm'))
            }
    #$parsedHtml = $response.ParsedHtml

    #$meta = ($parsedHtml.IHTMLDocument3_getElementsByTagName('meta') | %{$_.outerHTML}) -join [Environment]::NewLine
    #$contents = $parsedHtml.IHTMLDocument3_getElementById('contents').innerHtml
    #$contentsEnc = [System.Text.Encoding]::ASCII.GetString([System.Text.Encoding]::ASCII.GetBytes($contents))
    
    $b = $false
    $rawContent = $response.RawContent -split [Environment]::NewLine | %{
        if (!$b -and $_ -like '*contents*')
        {
            $b = $true
        }

        if ($_ -like '*// FOOTER START*')
        {
            $b = $false
        }

        if ($b)
        {
            $_
        }
    }
    $rawContent = $rawContent -join [Environment]::NewLine

    $meta,$contentsEnc,$rawContent -join [Environment]::NewLine
}

Get-Response $url | tee -Variable baseline
[System.IO.File]::WriteAllLines('baseline.txt', $baseline)

# open baseline in browser
#start msedge -ArgumentList $url,'--inprivate'

Get-Date
do
{
    $c++
    $guid = (New-Guid).ToString()
    sleep $retryInterval
    $currentVersion = Get-Response ($url + "?" + $guid)
}
while ($baseline -eq $currentVersion)
Get-Date
Write-Host "attempt" $c -ForegroundColor Red
$currentVersion

# open current version in browser
# do a hard-refresh to get the difference
#start msedge -ArgumentList $url,'--inprivate'
[System.IO.File]::WriteAllLines('currentVersion.txt', $currentVersion)