FtpHandling/Get-FTPItemSize.ps1

Function Get-FTPItemSize
{
    <#
    .SYNOPSIS
        Gets the item size.

    .DESCRIPTION
        The Get-FTPItemSize cmdlet gets the specific item size.

    .PARAMETER Path
        Specifies a path to ftp location.

    .PARAMETER Silent
        Hide warnings.

    .PARAMETER Session
        Specifies a friendly name for the ftp session. Default session name is 'DefaultFTPSession'.

    .EXAMPLE
        PS> Get-FTPItemSize -Path "/myFolder/myFile.txt"
        82033

    .NOTES
        Author: Michal Gajda
        Blog : http://commandlinegeeks.com/

    .LINK
        Get-FTPChildItem
    #>


    [CmdletBinding(SupportsShouldProcess, ConfirmImpact="Low")]
    [OutputType("System.Int64")]
    Param(
        [parameter(Mandatory=$true)]
        [String]$Path,
        [Switch]$Silent = $False,
        $Session = "DefaultFTPSession"
    )

    Begin
    {
        if($Session -isnot [String])
        {
            $CurrentSession = $Session
        }
        else
        {
            $CurrentSession = Get-Variable -Scope Global -Name $Session -ErrorAction SilentlyContinue -ValueOnly
        }

        if($null -eq $CurrentSession)
        {
            Write-Warning "Add-FTPItem: Cannot find session $Session. First use Set-FTPConnection to config FTP connection."
            Break
            Return
        }
    }

    Process
    {
        Write-Debug "Native path: $Path"

        if($Path -match "ftp://")
        {
            $RequestUri = $Path
            Write-Debug "Use original path: $RequestUri"

        }
        else
        {
            $RequestUri = $CurrentSession.RequestUri.OriginalString+"/"+$Path
            Write-Debug "Add ftp:// at start: $RequestUri"
        }
        $RequestUri = [regex]::Replace($RequestUri, '/$', '')
        $RequestUri = [regex]::Replace($RequestUri, '/+', '/')
        $RequestUri = [regex]::Replace($RequestUri, '^ftp:/', 'ftp://')
        Write-Debug "Remove additonal slash: $RequestUri"

        if ($pscmdlet.ShouldProcess($RequestUri,"Get item size"))
        {
            [System.Net.FtpWebRequest]$Request = [System.Net.WebRequest]::Create($RequestUri)
            $Request.Credentials = $CurrentSession.Credentials
            $Request.EnableSsl = $CurrentSession.EnableSsl
            $Request.KeepAlive = $CurrentSession.KeepAlive
            $Request.UseBinary = $CurrentSession.UseBinary
            $Request.UsePassive = $CurrentSession.UsePassive

            $Request.Method = [System.Net.WebRequestMethods+FTP]::GetFileSize
            Try
            {
                [System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$CurrentSession.ignoreCert}
                $Response = $Request.GetResponse()

                $Status = $Response.ContentLength
                $Response.Close()
                Return $Status
            }
            Catch
            {
                if(!$Silent)
                {
                    Write-Error $_.Exception.Message -ErrorAction Stop
                }
                Return [Int64]-1
            }
        }
    }

    End{}
}