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modules/Server/public/Get-VfpPortLayer.ps1

# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.

function Get-VfpPortLayer {
    <#
    .SYNOPSIS
        Enumerates the layers contained within Virtual Filtering Platform (VFP) for specified for the port.
    .PARAMETER PortId
        The Port ID GUID for the network interface.
    .PARAMETER Name
        Returns the specific layer name. If omitted, will return all layers within VFP.
    .EXAMPLE
        PS> Get-VfpPortLayer
    .EXAMPLE
        PS> Get-VfpPortLayer -PortId '2152523D-333F-4082-ADE4-107D8CA75F5B'
    #>

    param (
        [Parameter(Mandatory = $true)]
        [GUID]$PortId,

        [Parameter(Mandatory = $false)]
        [System.String]$Name
    )

    try {
        $arrayList = [System.Collections.ArrayList]::new()
        $vfpLayers = vfpctrl /list-layer /port $PortId
        if ($null -eq $vfpLayers) {
            return $null
        }

        foreach ($line in $vfpLayers) {
            # lines in the VFP output that contain : contain properties and values
            # need to split these based on count of ":" to build key and values
            if ($line.Contains(':')) {
                [System.String[]]$results = $line.Split(':').Trim()
                if ($results.Count -eq 2) {
                    $key = $results[0]

                    # if the key is priority, we want to declare the value as an int value so we can properly sort the results
                    if ($key -ieq 'Priority') {
                        [int]$value = $results[1] 
                    }
                    else {
                        [System.String]$value = $results[1]
                    }
                }
        
                # all layers begin with this property and value so need to create a new psobject when we see these keys
                if ($key -ieq 'Layer') {
                    $object = New-Object -TypeName PSObject
                }
        
                # add the line values to the object
                $object | Add-Member -MemberType NoteProperty -Name $key -Value $value
            }
        
            # all the layers are seperated with a blank line
            # use this as our end of properties to add the current obj to the array list
            if ([string]::IsNullOrEmpty($line)) {
                if ($object) {
                    [void]$arrayList.Add($object)
                }
            }
        }
        
        if ($Name) {
            return ($arrayList | Where-Object { $_.LAYER -eq $Name })
        }
        else {
            return ($arrayList | Sort-Object -Property Priority)
        }
    }
    catch {
        "{0}`n{1}" -f $_.Exception, $_.ScriptStackTrace | Trace-Output -Level:Error
    }
}