PSDependScripts/FileDownload.ps1
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<# .SYNOPSIS Download a file .DESCRIPTION Download a file Relevant Dependency metadata: DependencyName (Key): The key for this dependency is used as the URL. This can be overridden by 'Source' Name: Optional file name for the downloaded file. Defaults to parsing filename from the URL Target: The folder to download this file to. If a full path to a new file is used, this overrides any other file name. Source: Optional override for URL AddToPath: If specified, prepend the target's parent container to PATH .PARAMETER PSDependAction Test or Install the module. Defaults to Install Test: Return true or false on whether the dependency is in place Install: Install the dependency .EXAMPLE sqllite_dll = @{ DependencyType = 'FileDownload' Source = 'https://github.com/RamblingCookieMonster/PSSQLite/blob/master/PSSQLite/x64/System.Data.SQLite.dll?raw=true' Target = 'C:\temp' } # Downloads System.Data.SQLite.dll to C:\temp .EXAMPLE 'https://github.com/RamblingCookieMonster/PSSQLite/blob/master/PSSQLite/x64/System.Data.SQLite.dll?raw=true' = @{ DependencyType = 'FileDownload' Target = 'C:\temp\sqlite.dll' } # Downloads System.Data.SQLite.dll to C:\temp\sqlite.dll #> [cmdletbinding()] param( [PSTypeName('PSDepend.Dependency')] [psobject[]] $Dependency, [ValidateSet('Test', 'Install')] [string[]]$PSDependAction = @('Install') ) function Parse-URLForFile { [cmdletbinding()] param($URL) # This will need work. Assume leaf is file. If CGI exists in leaf, assume it is after the file $FileName = $URL.split('/')[-1] if($FileName -match '\?') { $FileName.split('?')[0] } else { $FileName } Write-Verbose "Parsed file name [$FileName] from `$URL" } # Extract data from Dependency $DependencyName = $Dependency.DependencyName $Name = $Dependency.Name $Target = $Dependency.Target $Source = $Dependency.Source # Pick the URL if($Source) { $URL = $Source } else { $URL = $DependencyName } Write-Verbose "Using URL: $URL" # Act on target path.... $TargetParent = Split-Path $Target -Parent if( (Test-Path $TargetParent) -and -not (Test-Path $Target)) { # They gave us a full path, don't parse the file name, use this! $Path = $Target Write-Verbose "Found parent [$TargetParent], not target [$Target], assuming this is target file path" } elseif(Test-Path $Target -PathType Leaf) { # File exists. We should download to temp spot, compare hashes, take action as appropriate. # For now, skip the file. Write-Verbose "Skipping existing file [$Target]" if($PSDependAction -contains 'Test') { return $True } return } elseif(-not (Test-Path $Target)) { # They gave us something that doesn't look like a new container for a new or existing file. Wat? Write-Error "Could not find target path [$Target]" if($PSDependAction -contains 'Test') { return $False } return } else { Write-Verbose "[$Target] is a container, creating path to file" # We have a target container, now find the name If($Name) { # explicit name $FileName = $Name } else { $FileName = Parse-URLForFile -URL $URL } $Path = Join-Path $Target $FileName if(Test-Path $Path -PathType Leaf) { Write-Verbose "Skipping existing file [$Path]" if($PSDependAction -contains 'Test') { return $True } return } } Write-Verbose "Using [$Path] as `$Target" #No dependency found, return false if we're testing alone... if( $PSDependAction -contains 'Test' -and $PSDependAction.count -eq 1) { return $False } Write-Verbose "Downloading [$URL] to [$Path]" if($PSDependAction -contains 'Install') { # Future considerations: # Should we check for existing? And if we find it, still download file, and compare sha256 hash, replace if it does not match? # We should consider credentials at some point, but PSD1 does not lend itself to securely storing passwords Get-WebFile -URL $URL -Path $Path } if($Dependency.AddToPath) { Write-Verbose "Setting PATH to`n$($TargetParent, $env:PATH -join ';' | Out-String)" $env:PATH = $TargetParent, $env:PATH -join ';' } |