Downloads the latest driver pack from Dell for any model or models you specify

Download-LatestDellDriverPack.ps1

[CmdletBinding()]
Param
(
    [Parameter(Mandatory=$true,
                ValueFromPipelineByPropertyName=$true,
                ValueFromPipeline=$true,
                Position=0)]
    [String[]]$Model,

    [Parameter(Mandatory=$true,
                Position=1)]
    [ValidateSet("Windows 10","Windows 8.1","Windows 8","Windows 7")]
    $OperatingSystem,

    [Parameter(Mandatory=$true,
                Position=2)]
    [String]$DownloadDirectory
)

Begin
{
    function Get-LatestDellDriverPackURL {
    
        [CmdletBinding()]
        Param
        (
            [Parameter(Mandatory=$true,
                        ValueFromPipelineByPropertyName=$true,
                        Position=0)]
            [String]$Model,

            [Parameter(Mandatory=$true,
                        ValueFromPipelineByPropertyName=$true,
                        Position=1)]
            [ValidateSet("Windows 10","Windows 8.1","Windows 8","Windows 7")]
            $OperatingSystem
        )

        # Remove the "E" prefix character from Latitude models due to some dodgy Dell URLs...
        If ($Model.ToCharArray()[0] -eq "E" -and $Model -notmatch "Embedded")
        {
            $Model = $Model.Replace("E","")
        }

        # Find the specific wiki page for the model from the main wiki page
        $URI = "http://en.community.dell.com/techcenter/enterprise-client/w/wiki/2065.dell-command-deploy-driver-packs-for-enterprise-client-os-deployment"
        Try
        {
            $HTML = Invoke-WebRequest -Uri $URI -ErrorAction Stop
            If ($OperatingSystem -eq "Windows 8")
            {
                # Filter out Windows 8.1 from the results if it's just Windows 8
                $Href = $HTML.AllElements | Where {$_.innerText -match ("$Model" + " W") -and $_.innerText -match $OperatingSystem -and $_.innerText -notmatch "8.1" -and $_.innerText -match "Driver" -and $_.tagName -eq "A"} | Select -ExpandProperty href
            }
            Else
            {
                $Href = $HTML.AllElements | Where {$_.innerText -match ("$Model" + " W") -and $_.innerText -match $OperatingSystem -and $_.innerText -match "Driver" -and $_.tagName -eq "A"} | Select -ExpandProperty href
            }
        }
        Catch
        {
            $_
            Return
        }

        If (!$Href)
        {
            Write-Error "No Wiki page found for $Model and $OperatingSystem."
            Return
        }

        # Find the download URL from the model
        $URI = "http://en.community.dell.com/$Href"
        Try
        {
            $HTML = Invoke-WebRequest -Uri $URI -ErrorAction Stop
            $CabDownloadLink = $HTML.AllElements | Where {$_.innerHTML -match "Download Now" -and $_.tagName -eq "A"} | Select -ExpandProperty href
            Return $CabDownloadLink
        }
        Catch
        {
            $_
            Return
        }

        Write-Error "No download URL found for $Model."
    
    }

    # Start a timer
    $Stopwatch = New-Object System.Diagnostics.Stopwatch
    $Stopwatch.Start()

}
Process
{
    Foreach ($System in $Model)
    {
        Write-Verbose "Finding the download URL for '$System' and '$OperatingSystem'"
        Try
        {
            # Get the download URL
            $URL = Get-LatestDellDriverPackURL -Model $System -OperatingSystem $OperatingSystem -ErrorAction Stop
        }
        Catch
        {
            $Stopwatch.Stop()
            $_
            Return
        }
            
        Write-Verbose "Initiating download of URL '$URL' with BITS"
        Try
        {
            # Begin the download
            Start-BitsTransfer -Source $URL -Destination $DownloadDirectory
        }
        Catch
        {
            $Stopwatch.Stop()
            $_
            Return
        }
    }
}
End
{
    $Stopwatch.Stop()
    Write-Verbose "Completed in $($Stopwatch.Elapsed.Minutes) minutes and $($Stopwatch.Elapsed.Seconds) seconds"
}