Src/Public/Get-LabMedia.ps1

function Get-LabMedia {
<#
    .SYNOPSIS
        Gets registered lab media.
    .DESCRIPTION
        The Get-LabMedia cmdlet retrieves all built-in and registered custom media.
    .PARAMETER Id
        Specifies the specific media Id to return.
    .PARAMETER CustomOnly
        Specifies that only registered custom media are returned.
    .PARAMETER Legacy
        Specifies that legacy Windows 10 evaluation media definition(s) are returned.
#>

    [CmdletBinding(DefaultParameterSetName = 'Default')]
    [OutputType([System.Management.Automation.PSCustomObject])]
    [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseSingularNouns','')]
    param (
        ## Media ID
        [Parameter(ValueFromPipeline)]
        [ValidateNotNullOrEmpty()]
        [System.String] $Id,

        ## Only return custom media
        [Parameter(ValueFromPipelineByPropertyName, ParameterSetName = 'Default')]
        [System.Management.Automation.SwitchParameter] $CustomOnly,

        ## Only return legacy media
        [Parameter(ValueFromPipelineByPropertyName, ParameterSetName = 'Legacy')]
        [System.Management.Automation.SwitchParameter] $Legacy
    )
    process {

        if ($PSBoundParameters.ContainsKey('Legacy')) {

            $legacyMediaPath = Resolve-ConfigurationDataPath -Configuration LegacyMedia -IsDefaultPath
            $media = Get-ChildItem -Path $legacyMediaPath | ForEach-Object {
                        Get-Content -Path $_.FullName | ConvertFrom-Json
                    }

            if ($Id) {

                $media = $media | Where-Object { $_.Id -eq $Id };
            }
        }
        else {

            ## Retrieve built-in media
            if (-not $CustomOnly) {

                $defaultMedia = Get-ConfigurationData -Configuration Media;
            }
            ## Retrieve custom media
            $customMedia = @(Get-ConfigurationData -Configuration CustomMedia);
            if (-not $customMedia) {

                $customMedia = @();
            }

            ## Are we looking for a specific media Id
            if ($Id) {

                ## Return the custom media definition first (if it exists)
                $media = $customMedia | Where-Object { $_.Id -eq $Id };
                if ((-not $media) -and (-not $CustomOnly)) {

                    ## We didn't find a custom media entry, return a default entry (if it exists)
                    $media = $defaultMedia | Where-Object { $_.Id -eq $Id };
                }
            }
            else {

                ## Return all custom media
                $media = $customMedia;
                if (-not $CustomOnly) {

                    foreach ($mediaEntry in $defaultMedia) {

                        ## Determine whether the media is present in the custom media, i.e. make sure
                        ## we don't override a custom entry with the default one.
                        $defaultMediaEntry = $customMedia | Where-Object { $_.Id -eq $mediaEntry.Id }
                        ## If not, add it to the media array to return
                        if (-not $defaultMediaEntry) {

                            $media += $mediaEntry;
                        }
                    } #end foreach default media
                } #end if not custom only
            }
        }

        foreach ($mediaObject in $media) {

            $mediaObject.PSObject.TypeNames.Insert(0, 'VirtualEngine.Lability.Media');
            Write-Output -InputObject $mediaObject;
        }

    } #end process
} #end function

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