Download all files in a folder on an FTP-server to the DestinationFolder. Source and destination must be specified. UrlPort, UserName and Password can be specified. Defaults to access a hardcoded URL.

DownloadFtpFolder.ps1

# DownloadFtpFolder.ps1 created by f-steff, Sept.12 2019.
# This is a modified version of DownloadFtpDirectory() by Martin Prikryl.
# usage: DownloadFtpFolder.ps1 SourceFolder Destination folder [UrlPort Username Password]

function EnsureTargetDirectory ($localPath)
{
	# Ensure to return a full qualified path.
	# Will create the folder(s) if needed.
	try
		{
			$VerifiedDirectory = New-Item -ItemType Directory -Path $localPath -ErrorAction stop -Force
		}
		catch
		{
			write-host "Error: Destination path could not be created: '$localPath'"
			throw "$_"
	}
	return $VerifiedDirectory.ToString()
}

function DownloadFtpDirectory($url, $credentials, [string]$localPath)
{
	# This function is a slightly modified version of Martin Prikryl answer on StackOverflow: https://stackoverflow.com/questions/37080506/powershell-ftp-download-files-and-subfolders
	write-debug "localPath = $localPath"
	If (!(Test-Path -Path $localPath))
	{
		throw "Error: Path does not exist: $localPath"
	}
	write-debug "Source      = $url"
	write-debug "Destination = $localPath"
	
	$listRequest = [Net.WebRequest]::Create($url)
	$listRequest.Method = [System.Net.WebRequestMethods+Ftp]::ListDirectoryDetails
	$listRequest.UsePassive = 1
	$listRequest.Credentials = $credentials
	
	$lines = New-Object System.Collections.ArrayList
	
	try
	{
		$listResponse = $listRequest.GetResponse()
	}
	catch
	{
		write-host "Error: Can not access server"
		throw ("$_")
	}
	$listStream = $listResponse.GetResponseStream()
	$listReader = New-Object System.IO.StreamReader($listStream)
	while (!$listReader.EndOfStream)
	{
		$line = $listReader.ReadLine()
		$lines.Add($line) | Out-Null
	}

	if ($listReader.PSobject.Properties.Name -contains "Dispose") { $listReader.Dispose() }
	if ($listStream.PSobject.Properties.Name -contains "Dispose") { $listStream.Dispose() }
	if ($listResponse.PSobject.Properties.Name -contains "Dispose") { $listResponse.Dispose() }
	
	foreach ($line in $lines)
	{
		$tokens = $line.Split(" ", 9, [StringSplitOptions]::RemoveEmptyEntries)
		$name = $tokens[8]
		$permissions = $tokens[0]
		
		$localFilePath = Join-Path $localPath $name
		$fileUrl = ($url + $name)
		
		if ($permissions[0] -eq 'd')
		{
			if (!(Test-Path $localFilePath -PathType container))
			{
				Write-Host "Creating directory $localFilePath"
				New-Item $localFilePath -Type directory | Out-Null
			}
			
			DownloadFtpDirectory ($fileUrl + "/") $credentials $localFilePath
		}
		else
		{
			Write-Host "Downloading $fileUrl to $localFilePath"
			
			$downloadRequest = [Net.WebRequest]::Create($fileUrl)
			$downloadRequest.Method = [System.Net.WebRequestMethods+Ftp]::DownloadFile
			$downloadRequest.Credentials = $credentials
			
			$downloadResponse = $downloadRequest.GetResponse()
			$sourceStream = $downloadResponse.GetResponseStream()
			$targetStream = [System.IO.File]::Create($localFilePath)
			$buffer = New-Object byte[] 10240
			while (($read = $sourceStream.Read($buffer, 0, $buffer.Length)) -gt 0)
			{
				$targetStream.Write($buffer, 0, $read);
			}
			if ($targetStream.PSobject.Properties.Name -contains "Dispose") { $targetStream.Dispose() }
			if ($sourceStream.PSobject.Properties.Name -contains "Dispose") { $sourceStream.Dispose() }
			if ($downloadResponse.PSobject.Properties.Name -contains "Dispose") { $downloadResponse.Dispose() }
		}
	}
}

# Main

$DebugPreference = "Continue" # Display debug
$DebugPreference = "SilentlyContinue" # Suppress debug

try
{
	$SourceFolder      = If ($($args[0])) { $($args[0]) } Else { throw 'Error: Source folder not specified' }      # Opt. Comment during Debugging.
	$DestinationFolder = If ($($args[1])) { $($args[1]) } Else { throw 'Error: Destination folder not specified' } # Opt. Comment during Debugging.
#	$SourceFolder = '/pub/hvsc/C64Music/DEMOS/Commodore//' # Debug
#	$DestinationFolder = 'c:\Work\DownloadFtpFolder\test\' # Debug
	$UrlPort           = If ($($args[2])) { $($args[2]) } Else { 'arnold.c64.org:21' }
	$Username          = If ($($args[3])) { $($args[3]) } Else { 'anonymous' }
	$PassWord          = If ($($args[4])) { $($args[4]) } Else { '[email protected]' }
	
	if ($SourceFolder[-1] -ne "/") { $SourceFolder += "/" }
	
    Write-Host ""
	Write-Host "Downloading FTP directory using DownloadFtpFolder.ps1"
	write-Host "Src = ftp://$UrlPort$SourceFolder"
	write-debug "Dst = $DestinationFolder"
	write-debug "UrlPort = $UrlPort"
	write-debug "Username = $Username"
	write-debug "PassWord = $PassWord"
	
	$credentials = New-Object System.Net.NetworkCredential($UserName, $Password)
	$url = "ftp://$UrlPort/$SourceFolder"
	
	$VerifiedFolder = EnsureTargetDirectory $DestinationFolder # Ensure we have a full working path.
	Write-Host "Dst = $VerifiedFolder"
	DownloadFtpDirectory $url $credentials $VerifiedFolder
    Write-Host ""
	Exit 0
}
catch
{
	$line = $_.InvocationInfo.ScriptLineNumber
    Write-Host -ForegroundColor Red "ERROR:"
	Write-Host -ForegroundColor Red "An exception occurred at line $line"
	Write-Host -ForegroundColor Red '$_ = ' $_
	Write-Host -ForegroundColor Red '$_.Exception.Message = ' $_.Exception.Message
	Write-Host -ForegroundColor Red '$_.GetType().FullName = ' $_.GetType().FullName
	Write-Host -ForegroundColor Red '$_.Exception.GetType().FullName = ' $_.Exception.GetType().FullName
	Write-Host -ForegroundColor Red '$_.Exception = ' $_.Exception
    Write-Host ""
	Exit 1
}

Download files from a specified folder loacted an an FTP server.

Requires Jenkins Managed Configuration plugin and the Powershell plugin.

FTP URL and port, as well as username and password are hardcoded in the script, but can be overwritten during invocation.

Instructions for uploading the script.

1. Upload script to Managed Scripts
2. Name the script: "DownloadFtpFolder.ps1"
3. Add a Comment such as "Download all files in a folder on an FTP-server to the DestinationFolder. Source and destination must be specified. UrlPort, UserName and Password can be specified. Defaults to access the HVSC"
4. Add argument: SourceFolder
5. Add argument: DestinationFolder
6. Add argument: [UrlPort]
7. Add argument: [UserName]
8. Add argument: [Password]

Instructions for using the script.

1. Add a Execute managed powershell build step.
2. Select the script to execute: DownloadFtpFolder.ps1
3. Select Define arguments:
4. Set the source folder. - If using together with the List_FTP_Folders.groovy, specify '${MySelectedFolder}'
5. Set the destination folder: '${WORKSPACE}\HVSC'

Once executed, the files will be downloaded.