OS_EOL_Checker_Bad_API

<#09/03/2021
    EDIT : Adding Extended Support Check (ESU program)
#>

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

$os_name =  (Get-Item "HKLM:SOFTWARE\Microsoft\Windows NT\CurrentVersion").GetValue('ProductName')
$search = $os_name.ToString().Replace(" ",'%20')

$display =  (Get-Item "HKLM:SOFTWARE\Microsoft\Windows NT\CurrentVersion").GetValue('DisplayVersion')
if ($display -eq $null){
    $display = [System.Environment]::OSVersion.Version.Build
}

#Works on 2016/W10/W8
$wrongly_called_api = Invoke-WebRequest -ErrorAction SilentlyContinue -Uri "https://docs.microsoft.com/api/contentbrowser/search/lifecycles?locale=en-us&terms=$search&facet=products&%24top=1" -Headers @{
"method"="GET"
  "authority"="docs.microsoft.com"
  "scheme"="https"
  "user-agent"="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36"
  "accept"="*/*"
  "sec-fetch-site"="same-origin"
  "sec-fetch-mode"="cors"
  "sec-fetch-dest"="empty"
  "accept-encoding"="gzip, deflate, br"
}

#Workaround for older version of Powershell
if ($wrongly_called_api -eq $null){
    $wrongly_called_api = Invoke-WebRequest -UseBasicParsing -Uri "https://docs.microsoft.com/api/contentbrowser/search/lifecycles?locale=en-us&terms=$search&facet=products&%24top=1" -Headers @{
    "method"="GET"
      "authority"="docs.microsoft.com"
      "scheme"="https"
      "sec-fetch-site"="same-origin"
      "sec-fetch-mode"="cors"
      "sec-fetch-dest"="empty"
      "accept-encoding"="gzip, deflate, br"
    }
}


$json = $wrongly_called_api.Content | ConvertFrom-Json
$search_result = Invoke-WebRequest ("https://docs.microsoft.com/en-us"+$json.results.Url)

$dates = ($search_result.Content -split "<tbody>" -split "</tbody>" )[1,3] -split "</tr>"
$headers = (($search_result.Content -split "<tbody>" -split "</tbody>" )[0] -split "<thead>" -split "</thead>")[1] -split "<tr>" -split "</tr>"
$headers = (($headers -split '<th align="right">')[2..(($headers -split '<th align="right">').Count)] -replace '</th>').Trim() | Where-Object {$_}

$sorted_info = @()

$dates | % {

    $minmax = ($_ -split "<local-time datetime=`"")[1..(($_ -split "<local-time datetime=`"").Count -1)] | % {(($_ -split '</local-time>')[0] -split '">')[1]}
    if($minmax -ne $null){
        $value = [PSCustomObject]@{
            Name = ($_ -split"<td>" -split "</td>")[1]
            Start = [Datetime]$minmax[0]
            End= [Datetime]$minmax[1]
        }
        if ($headers[-1] -like "Extended End Date"){
            $extended = [Datetime]$minmax[2]
            $value | Add-Member -MemberType NoteProperty -Name 'Extended' -Value $extended
        }
        $sorted_info += $value
    }
}



if ((get-date) -lt ($sorted_info | where Name -Match $display | select -expand End)){
    Write-Host -ForegroundColor Green "OS currently supported"
}
else{
    Write-Host -ForegroundColor Red "OS out of support"
    if ((get-date) -lt ($sorted_info | where Name -Match $display | select -expand Extended)){
        Write-Host -ForegroundColor Yellow "ESU is still supported"
    }
}