DSCResources/xDownloadFile/xDownloadFile.psm1

function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [parameter(Mandatory = $true)]
        [System.String]
        $SourcePath,
        
        [parameter(Mandatory = $true)]
        [System.String]
        $FileName,

        [parameter(Mandatory = $true)]
        [System.String]
        $DestinationDirectoryPath,

        [parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

        [parameter()]
        [System.String]
        [ValidateSet("Basic", "Digest", "Negotiate", "NTLM", "Passport")]
        $Authentication
    )
    $returnValue = @{
        SourcePath = $SourcePath
        FileName  = $FileName
        DestinationDirectoryPath = $DestinationDirectoryPath
    }
    $returnValue
}


function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [parameter(Mandatory = $true)]
        [System.String]
        $SourcePath,
        
        [parameter(Mandatory = $true)]
        [System.String]
        $FileName,

        [parameter(Mandatory = $true)]
        [System.String]
        $DestinationDirectoryPath,

        [parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

        [parameter()]
        [System.String]
        [ValidateSet("Basic", "Digest", "Negotiate", "NTLM", "Passport")]
        $Authentication
    )

    Write-Verbose "Create Destination Directory"
    if(!(Test-Path $DestinationDirectoryPath))
    {
        New-Item -Path $DestinationDirectoryPath -ItemType Directory -Force
    }

    $output = Join-Path $DestinationDirectoryPath $FileName
    $startTime = [System.DateTimeOffset]::Now
    Write-Verbose "Start to download file from $SourcePath"
    Get-BitsTransfer | Remove-BitsTransfer

    if ($null -ne $Credential -and -not [System.String]::IsNullOrEmpty($Authentication))
    {
        $downloadJob = Start-BitsTransfer -Source $SourcePath `
            -Destination $output `
            -DisplayName "Download" `
            -Asynchronous `
            -RetryInterval 60 `
            -Priority Foreground `
            -Credential $Credential `
            -Authentication $Authentication
    }
    else
    {
        $downloadJob = Start-BitsTransfer -Source $SourcePath `
            -Destination $output `
            -DisplayName "Download" `
            -Asynchronous `
            -RetryInterval 60 `
            -Priority Foreground
    }

    while (-not ((Get-BitsTransfer -JobId $downloadJob.JobId).JobState -eq "Transferred"))
    {
        Start-Sleep -Seconds (20)
        Write-Verbose -Verbose -Message ("Waiting for $SourcePath, time taken: {0}" -f ([System.DateTimeOffset]::Now - $startTime).ToString())
        Write-Verbose -Message ($downloadJob | Format-List | Out-String)
    }
    Complete-BitsTransfer -BitsJob $downloadJob
    Write-Verbose "Complete download file from $SourcePath"
}


function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [parameter(Mandatory = $true)]
        [System.String]
        $SourcePath,
        
        [parameter(Mandatory = $true)]
        [System.String]
        $FileName,

        [parameter(Mandatory = $true)]
        [System.String]
        $DestinationDirectoryPath,

        [parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

        [parameter()]
        [System.String]
        [ValidateSet("Basic", "Digest", "Negotiate", "NTLM", "Passport")]
        $Authentication
    )
    $output = Join-Path $DestinationDirectoryPath $FileName
    Test-Path $output
}


Export-ModuleMember -Function *-TargetResource