Lability

0.15.1

Src/Private/Invoke-WebClientDownload.ps1

                                function Invoke-WebClientDownload {

<#

    .SYNOPSIS

        Downloads a (web) resource using System.Net.WebClient.

    .NOTES

        This solves issue #19 when running downloading resources using BITS under alternative credentials.

#>

    [CmdletBinding()]

    [OutputType([System.IO.FileInfo])]

    param (

        [Parameter(Mandatory, ValueFromPipeline)]

        [System.String] $DestinationPath,

        [Parameter(Mandatory, ValueFromPipelineByPropertyName)]

        [System.String] $Uri,

        [Parameter(ValueFromPipelineByPropertyName)]

        [System.UInt32] $BufferSize = 64KB,

        [Parameter(ValueFromPipelineByPropertyName)] [AllowNull()]

        [System.Management.Automation.PSCredential]

        [System.Management.Automation.CredentialAttribute()]

        $Credential

    )

    process {

        try {

            [System.Net.WebClient] $webClient = New-Object -TypeName 'System.Net.WebClient';

            $webClient.Headers.Add('user-agent', $labDefaults.ModuleName);

            $webClient.Proxy = [System.Net.WebRequest]::GetSystemWebProxy();

            if (-not $webClient.Proxy.IsBypassed($Uri)) {

                $proxyInfo = $webClient.Proxy.GetProxy($Uri);

                Write-Verbose -Message ($localized.UsingProxyServer -f $proxyInfo.AbsoluteUri);

            }

            if ($Credential) {

                $webClient.Credentials = $Credential;

                $webClient.Proxy.Credentials = $Credential;

            }

            else {

                $webClient.UseDefaultCredentials = $true;

                $webClient.Proxy.Credentials = [System.Net.CredentialCache]::DefaultCredentials;

            }

            [System.IO.Stream] $inputStream = $webClient.OpenRead($Uri);

            [System.UInt64] $contentLength = $webClient.ResponseHeaders['Content-Length'];

            $path = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($DestinationPath);

            [System.IO.Stream] $outputStream = [System.IO.File]::Create($path);

            [System.Byte[]] $buffer = New-Object -TypeName System.Byte[] -ArgumentList $BufferSize;

            [System.UInt64] $bytesRead = 0;

            [System.UInt64] $totalBytes = 0;

            $writeProgessActivity = $localized.DownloadingActivity -f $Uri;

            do {

                $bytesRead = $inputStream.Read($buffer, 0, $buffer.Length);

                $totalBytes += $bytesRead;

                $outputStream.Write($buffer, 0, $bytesRead);

                ## Avoid divide by zero

                if ($contentLength -gt 0) {

                    [System.Byte] $percentComplete = ($totalBytes/$contentLength) * 100;

                    $writeProgressParams = @{

                        Activity = $writeProgessActivity;

                        PercentComplete = $percentComplete;

                        Status = $localized.DownloadStatus -f $totalBytes, $contentLength, $percentComplete;

                    }

                    Write-Progress @writeProgressParams;

                }

            }

            while ($bytesRead -ne 0)

            $outputStream.Close();

            return (Get-Item -Path $path);

        }

        catch {

            throw ($localized.WebResourceDownloadFailedError -f $Uri);

        }

        finally {

            if ($null -ne $writeProgressActivity) {

                Write-Progress -Activity $writeProgessActivity -Completed;

            }

            if ($null -ne $outputStream) {

                $outputStream.Close();

            }

            if ($null -ne $inputStream) {

                $inputStream.Close();

            }

            if ($null -ne $webClient) {

                $webClient.Dispose();

            }

        }

    } #end process

} #end function

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