functions/Invoke-Download.ps1
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function Invoke-WUDownload { <# .SYNOPSIS Download files at high speed using aria2. .DESCRIPTION Download files at high speed using aria2. .EXAMPLE PS C:\>Invoke-WUDownload -Uri "https://wslstorestorage.blob.core.windows.net/wslblob/wsl_update_x64.msi" -Destination $env:TMP -MaxConnectionPerServer 16 -Force This example downloads the file from the specified URI to $env:TMP. The maximum number of connections to one server is 16. Overwrites the destination file if it already exists. #> [CmdletBinding(SupportsShouldProcess, DefaultParameterSetName = 'Path')] param ( # Specify the Uri of the file to download. [Parameter(Mandatory, Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName)] [ValidateNotNullOrEmpty()] [uri] $Uri, # Specifies the path to the location where the items are being downloaded. The default is the current directory. [ValidateNotNullOrEmpty()] [string] $Destination = $PWD, # Specify the maximum number of connections to one server. The range of numbers is 1 to 16. [ValidateRange(1, 16)] [int] $MaxConnectionPerServer = 16, # Specify when overwriting the file. [switch] $Force ) $DestinationFullPath = '' $DestinationFullPath = $psCmdlet.SessionState.Path.GetUnresolvedProviderPathFromPSPath($Destination) if (!$DestinationFullPath) { return } if ((Test-Path -LiteralPath $DestinationFullPath -PathType Container)) { if (!(Assert-WUPathProperty -LiteralPath $DestinationFullPath -PSProvider FileSystem -PathType Container)) { return } $outDirPath = $DestinationFullPath $outName = '' } else { $outDirPath = Split-Path $DestinationFullPath -Parent $outName = Split-Path $DestinationFullPath -Leaf if (!$outDirPath) { Write-Error "Failed to get the parent directory of path '$DestinationFullPath'." return } if ((Test-Path -LiteralPath $outDirPath -PathType Container)) { if (!(Assert-WUPathProperty -LiteralPath $outDirPath -PSProvider FileSystem -PathType Container)) { return } } else { New-Item -Path $outDirPath -ItemType 'Directory' -Force | Out-String | Write-Verbose if (!(Assert-WUPathProperty -LiteralPath $outDirPath -PSProvider FileSystem -PathType Container)) { return } } } $cmd = '& aria2c --auto-file-renaming=false -x {0} ' -f $MaxConnectionPerServer $cmd = '{0} -d "{1}"' -f $cmd, (Convert-WUString -String $outDirPath -Type EscapeForPowerShellDoubleQuotation) if ($outName) { $cmd = '{0} -o "{1}"' -f $cmd, (Convert-WUString -String $outName -Type EscapeForPowerShellDoubleQuotation) } if ($Force) { $cmd = '{0} --allow-overwrite=true' -f $cmd } $cmd = '{0} "{1}"' -f $cmd, (Convert-WUString -String $Uri -Type EscapeForPowerShellDoubleQuotation) Write-Host "Downloading from '$Uri' to '$outDirPath'" if ($pscmdlet.ShouldProcess($cmd, 'Execute')) { Invoke-Expression $cmd } } |