wingetautoupdate/Winget-AutoUpdate/functions/Test-ListPath.ps1

# Function to check Block/Allow List External Path

function Test-ListPath
{
   # URL, UNC or Local Path 
   [CmdletBinding()]
   param
   (
      [string]
      $ListPath,
      [string]
      $UseWhiteList,
      [string]
      $WingetUpdatePath
   )
   
   if ($UseWhiteList)
   {
      $ListType = 'included_apps.txt'
   }
   else
   {
      $ListType = 'excluded_apps.txt'
   }
   
   # Get local and external list paths
   $LocalList = -join ($WingetUpdatePath, '\', $ListType)
   $ExternalList = -join ($ListPath, '\', $ListType)
   
   # Check if a list exists
   if (Test-Path -Path $LocalList -ErrorAction SilentlyContinue)
   {
      $dateLocal = (Get-Item -Path $LocalList).LastWriteTime.ToString('yyyy-MM-dd HH:mm:ss')
   }
   
   # If path is URL
   if ($ListPath -like 'http*')
   {
      $ExternalList = -join ($ListPath, '/', $ListType)
      $wc = (New-Object -TypeName System.Net.WebClient)
      
      try
      {
         $null = $wc.OpenRead($ExternalList).Close()
         $dateExternal = ([DateTime]$wc.ResponseHeaders['Last-Modified']).ToString('yyyy-MM-dd HH:mm:ss')
         
         if ($dateExternal -gt $dateLocal)
         {
            try
            {
               $wc.DownloadFile($ExternalList, $LocalList)
            }
            catch
            {
               $Script:ReachNoPath = $True
               return $False
            }
            return $True
         }
      }
      catch
      {
         try
         {
            $content = $wc.DownloadString(('{0}' -f $ExternalList))
            
            if ($null -ne $content -and $content -match '\w\.\w')
            {
               $wc.DownloadFile($ExternalList, $LocalList)
               return $True
            }
            else
            {
               $Script:ReachNoPath = $True
               return $False
            }
         }
         catch
         {
            $Script:ReachNoPath = $True
            return $False
         }
      }
   }
   else
   {
      # If path is UNC or local
      if (Test-Path -Path $ExternalList)
      {
         try
         {
            $dateExternal = (Get-Item -Path ('{0}' -f $ExternalList)).LastWriteTime.ToString('yyyy-MM-dd HH:mm:ss')
         }
         catch
         {
            $Script:ReachNoPath = $True
            return $False
         }
         
         if ($dateExternal -gt $dateLocal)
         {
            try
            {
               Copy-Item -Path $ExternalList -Destination $LocalList -Force
            }
            catch
            {
               $Script:ReachNoPath = $True
               return $False
            }
            return $True
         }
      }
      else
      {
         $Script:ReachNoPath = $True
      }
      
      return $False
   }
}