Private/Get-UpdateCatalogDownloadInfo.ps1

Function Get-UpdateCatalogDownloadInfo {
    <#
        .SYNOPSIS
            Builds an object with the update notes and download details.
    #>

    [OutputType([System.Management.Automation.PSObject])]
    [CmdletBinding(SupportsShouldProcess = $False)]
    Param(
        [Parameter(Mandatory = $True)]
        [ValidateNotNullOrEmpty()]
        [System.String] $UpdateId,

        [Parameter(Mandatory = $False)]
        [System.String] $Architecture = 'x64|x86|ARM64',

        [Parameter(Mandatory = $False)]
        [ValidateNotNullOrEmpty()]
        [System.String] $OS = "Windows 10|Windows Server"
    )

    # Get module strings from the JSON
    $resourceStrings = Get-ModuleResource

    # Search the Update Catalog for the specific update KB
    $searchResult = Invoke-UpdateCatalogSearch -UpdateId $UpdateId

    If ($Null -ne $searchResult) {
        # Determine link id's and update description
        $UpdateCatalogItems = ($searchResult.Links | Where-Object { $_.Id -match "_link" })
        ForEach ($UpdateCatalogItem in $UpdateCatalogItems) {
            If (($UpdateCatalogItem.outerHTML -match $Architecture) -and ($UpdateCatalogItem.outerHTML -match $OS)) {
                $CurrentUpdateDescription = ($UpdateCatalogItem.outerHTML -replace $resourceStrings.Matches.DownloadDescription, '$1').TrimStart().TrimEnd()
                $CurrentUpdateLinkID = $UpdateCatalogItem.id.Replace("_link", "")
                Write-Verbose -Message "$($MyInvocation.MyCommand): match item [$CurrentUpdateDescription]"
            }

            # Construct update catalog object that will be used to call update catalog download API
            $UpdateCatalogData = [PSCustomObject] @{
                KB          = $UpdateId
                LinkID      = $CurrentUpdateLinkID
                Description = $CurrentUpdateDescription
            }

            # Construct an ordered hashtable containing the update ID data and convert to JSON
            $UpdateCatalogTable = [ordered] @{
                Size      = 0
                Languages = $resourceStrings.Languages.Default
                UidInfo   = $UpdateCatalogData.LinkID
                UpdateID  = $UpdateCatalogData.LinkID
            }
            $UpdateCatalogJSON = $UpdateCatalogTable | ConvertTo-Json -Compress

            # Construct body object for web request call
            $Body = @{
                UpdateIDs = "[$($UpdateCatalogJSON)]"
            }

            # Call update catalog download dialog using a rest call
            $updateDownload = Invoke-UpdateCatalogDownloadDialog -Body $Body

            # Match specific update
            If ($Null -ne $updateDownload) {
                $updateDownloadURL = $updateDownload | Select-Object -ExpandProperty Content |
                        Select-String -AllMatches -Pattern $resourceStrings.Matches.DownloadUrl |
                        ForEach-Object { $_.Matches.Value }
                        
                Write-Verbose -Message "$($MyInvocation.MyCommand): extract URL [$updateDownloadURL]"
            
                $UpdateCatalogDownloadItem = [PSCustomObject] @{
                    KB   = $UpdateCatalogData.KB
                    Note = $CurrentUpdateDescription
                    URL  = $updateDownloadURL
                }

                Write-Output -InputObject $UpdateCatalogDownloadItem
            }
        }
    }
}