DSCResources/DSC_xRemoteFile/DSC_xRemoteFile.psm1
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$errorActionPreference = 'Stop' Set-StrictMode -Version 'Latest' $modulePath = Join-Path -Path (Split-Path -Path (Split-Path -Path $PSScriptRoot -Parent) -Parent) -ChildPath 'Modules' # Import the shared modules Import-Module -Name (Join-Path -Path $modulePath ` -ChildPath (Join-Path -Path 'xPSDesiredStateConfiguration.Common' ` -ChildPath 'xPSDesiredStateConfiguration.Common.psm1')) # Import Localization Strings $script:localizedData = Get-LocalizedData -ResourceName 'DSC_xRemoteFile' # Path where cache will be stored. It's cleared whenever LCM gets new configuration. $script:cacheLocation = "$env:ProgramData\Microsoft\Windows\PowerShell\Configuration\BuiltinProvCache\DSC_xRemoteFile" <# .SYNOPSIS The Get-TargetResource function is used to fetch the status of file specified in DestinationPath on the target machine. .PARAMETER DestinationPath Path under which downloaded or copied file should be accessible after operation. .PARAMETER Uri Uri of a file which should be copied or downloaded. This parameter supports HTTP and HTTPS values. .PARAMETER ChecksumType The algorithm used to calculate the checksum of the file. #> function Get-TargetResource { [CmdletBinding()] [OutputType([System.Collections.Hashtable])] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $DestinationPath, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Uri, [Parameter()] [System.String] [ValidateSet('None', 'SHA1', 'SHA256', 'SHA384', 'SHA512', 'MACTripleDES', 'MD5', 'RIPEMD160')] $ChecksumType = 'None' ) # Check whether DestinationPath is existing file $ensure = 'Absent' $pathItemType = Get-PathItemType -Path $DestinationPath $checksumValue = '' switch ($pathItemType) { 'File' { Write-Verbose -Message ($script:localizedData.DestinationPathIsExistingFile -f $DestinationPath) $ensure = 'Present' if ($ChecksumType -ine 'None') { $getFileHash = Get-FileHash -Path $DestinationPath -Algorithm $ChecksumType $checksumValue = $getFileHash.Hash } } 'Directory' { Write-Verbose -Message ($script:localizedData.DestinationPathIsExistingPath -f $DestinationPath) # If it's existing directory, let's check whether expectedDestinationPath exists $uriFileName = Split-Path -Path $Uri -Leaf $expectedDestinationPath = Join-Path -Path $DestinationPath -ChildPath $uriFileName if (Test-Path -Path $expectedDestinationPath) { Write-Verbose -Message ($script:localizedData.FileExistsInDestinationPath -f $uriFileName) $ensure = 'Present' if ($ChecksumType -ine 'None') { $getFileHash = Get-FileHash -Path $expectedDestinationPath -Algorithm $ChecksumType $checksumValue = $getFileHash.Hash } } } 'Other' { Write-Verbose -Message ($script:localizedData.DestinationPathUnknownType -f $DestinationPath, $pathItemType) } 'NotExists' { Write-Verbose -Message ($script:localizedData.DestinationPathDoesNotExist -f $DestinationPath) } } return @{ DestinationPath = $DestinationPath Uri = $Uri Ensure = $ensure Checksum = $checksumValue } } <# .SYNOPSIS The Set-TargetResource function is used to download file found under Uri location to DestinationPath. Additional parameters can be specified to configure web request. .PARAMETER DestinationPath Path under which downloaded or copied file should be accessible after operation. .PARAMETER Uri Uri of a file which should be copied or downloaded. This parameter supports HTTP and HTTPS values. .PARAMETER UserAgent User agent for the web request. .PARAMETER Headers Headers of the web request. .PARAMETER Credential Specifies a user account that has permission to send the request. .PARAMETER MatchSource A boolean value to indicate whether the remote file should be re-downloaded if the file in the DestinationPath was modified locally. The default value is true. .PARAMETER TimeoutSec Specifies how long the request can be pending before it times out. .PARAMETER Proxy Uses a proxy server for the request, rather than connecting directly to the Internet resource. Should be the URI of a network proxy server (e.g 'http://10.20.30.1'). .PARAMETER ProxyCredential Specifies a user account that has permission to use the proxy server that is specified by the Proxy parameter. .PARAMETER Checksum Specifies the expected checksum value of downloaded file. .PARAMETER ChecksumType The algorithm used to calculate the checksum of the file. #> function Set-TargetResource { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $DestinationPath, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Uri, [Parameter()] [System.String] $UserAgent, [Parameter()] [Microsoft.Management.Infrastructure.CimInstance[]] $Headers, [Parameter()] [System.Management.Automation.Credential()] [System.Management.Automation.PSCredential] $Credential, [Parameter()] [System.Boolean] $MatchSource = $true, [Parameter()] [System.Uint32] $TimeoutSec, [Parameter()] [System.String] $Proxy, [Parameter()] [System.Management.Automation.Credential()] [System.Management.Automation.PSCredential] $ProxyCredential, [Parameter()] [System.String] [ValidateSet('None', 'SHA1', 'SHA256', 'SHA384', 'SHA512', 'MACTripleDES', 'MD5', 'RIPEMD160')] $ChecksumType = 'None', [Parameter()] [System.String] $Checksum ) # Validate Uri if (-not (Test-UriScheme -Uri $Uri -Scheme 'http|https|file')) { $errorMessage = $script:localizedData.InvalidWebUriError -f $Uri New-InvalidDataException ` -ErrorId 'UriValidationFailure' ` -ErrorMessage $errorMessage } # Validate DestinationPath scheme if (-not (Test-UriScheme -Uri $DestinationPath -Scheme 'file')) { $errorMessage = $script:localizedData.InvalidDestinationPathSchemeError -f $DestinationPath New-InvalidDataException ` -ErrorId 'DestinationPathSchemeValidationFailure' ` -ErrorMessage $errorMessage } # Validate DestinationPath is not UNC path if ($DestinationPath.StartsWith('\\')) { $errorMessage = $script:localizedData.DestinationPathIsUncError -f $DestinationPath New-InvalidDataException ` -ErrorId 'DestinationPathIsUncFailure' ` -ErrorMessage $errorMessage } # Validate DestinationPath does not contain invalid characters @('*', '?', '"', '<', '>', '|') | ForEach-Object -Process { if ($DestinationPath.Contains($_)) { $errorMessage = $script:localizedData.DestinationPathHasInvalidCharactersError -f $DestinationPath New-InvalidDataException ` -ErrorId 'DestinationPathHasInvalidCharactersError' ` -ErrorMessage $errorMessage } } # Validate DestinationPath does not end with / or \ (Invoke-WebRequest requirement) if ($DestinationPath.EndsWith('/') -or $DestinationPath.EndsWith('\')) { $errorMessage = $script:localizedData.DestinationPathEndsWithInvalidCharacterError -f $DestinationPath New-InvalidDataException ` -ErrorId 'DestinationPathEndsWithInvalidCharacterError' ` -ErrorMessage $errorMessage } # Check whether DestinationPath's parent directory exists. Create if it doesn't. $destinationPathParent = Split-Path -Path $DestinationPath -Parent if (-not (Test-Path $destinationPathParent)) { $null = New-Item -ItemType Directory -Path $destinationPathParent -Force } # Check whether DestinationPath's leaf is an existing folder $uriFileName = Split-Path -Path $Uri -Leaf if (Test-Path $DestinationPath -PathType Container) { $DestinationPath = Join-Path -Path $DestinationPath -ChildPath $uriFileName } # Remove ChecksumType and Checksum from parameters as they are not parameters of Invoke-WebRequest. $null = $PSBoundParameters.Remove('ChecksumType') $null = $PSBoundParameters.Remove('Checksum') # Remove DestinationPath and MatchSource from parameters as they are not parameters of Invoke-WebRequest $null = $PSBoundParameters.Remove('DestinationPath') $null = $PSBoundParameters.Remove('MatchSource') # Convert headers to hashtable $null = $PSBoundParameters.Remove('Headers') $headersHashtable = $null if ($null -ne $Headers) { $headersHashtable = Convert-KeyValuePairArrayToHashtable -Array $Headers } # Invoke web request try { $currentProgressPreference = $ProgressPreference $ProgressPreference = 'SilentlyContinue' Write-Verbose -Message ($script:localizedData.DownloadingURI -f $DestinationPath, $URI) $count = 0 $success = $false do { try { $count++ Invoke-WebRequest ` @PSBoundParameters ` -Headers $headersHashtable ` -OutFile $DestinationPath $success = $true } catch [System.Exception] { Write-Verbose -Message ($script:localizedData.DownloadingFailedRetry -f $URI, $count, $_.Exception.Message) if ($count -gt 5) { # Inside catch variable $_ is not the exception itself, but a System.Management.Automation.ErrorRecord that contains the actual Exception throw $_.Exception } Start-Sleep -Seconds 5 } } while ($success -eq $false) } catch [System.OutOfMemoryException] { $errorMessage = $script:localizedData.DownloadOutOfMemoryException -f $_ New-InvalidDataException ` -ErrorId 'SystemOutOfMemoryException' ` -ErrorMessage $errorMessage } catch [System.Exception] { $errorMessage = $script:localizedData.DownloadException -f $_ New-InvalidDataException ` -ErrorId 'SystemException' ` -ErrorMessage $errorMessage } finally { $ProgressPreference = $currentProgressPreference } # Check checksum if ($ChecksumType -ine 'None' -and -not [String]::IsNullOrEmpty($Checksum)) { $fileHashSplat = @{ Path = $DestinationPath Algorithm = $ChecksumType } $getFileHash = Get-FileHash @fileHashSplat $fileHash = $getFileHash.Hash if ($fileHash -ine $Checksum) { # the checksum failed $errorMessage = $script:localizedData.ChecksumDoesNotMatch -f $Checksum, $fileHash New-InvalidDataException ` -ErrorId 'ChecksumDoesNotMatch' ` -ErrorMessage $errorMessage } } # Update cache if (Test-Path -Path $DestinationPath) { $downloadedFile = Get-Item -Path $DestinationPath $lastWriteTime = $downloadedFile.LastWriteTimeUtc $filesize = $downloadedFile.Length $inputObject = @{ } $inputObject['LastWriteTime'] = $lastWriteTime $inputObject['FileSize'] = $filesize Update-Cache -DestinationPath $DestinationPath -Uri $Uri -InputObject $inputObject } } <# .SYNOPSIS The Test-TargetResource function is used to validate if the DestinationPath exists on the machine. .PARAMETER DestinationPath Path under which downloaded or copied file should be accessible after operation. .PARAMETER Uri Uri of a file which should be copied or downloaded. This parameter supports HTTP and HTTPS values. .PARAMETER UserAgent User agent for the web request. .PARAMETER Headers Headers of the web request. .PARAMETER Credential Specifies a user account that has permission to send the request. .PARAMETER MatchSource A boolean value to indicate whether the remote file should be re-downloaded if the file in the DestinationPath was modified locally. The default value is true. .PARAMETER TimeoutSec Specifies how long the request can be pending before it times out. .PARAMETER Proxy Uses a proxy server for the request, rather than connecting directly to the Internet resource. Should be the URI of a network proxy server (e.g 'http://10.20.30.1'). .PARAMETER ProxyCredential Specifies a user account that has permission to use the proxy server that is specified by the Proxy parameter. .PARAMETER Checksum Specifies the expected checksum value of downloaded file. .PARAMETER ChecksumType The algorithm used to calculate the checksum of the file. #> function Test-TargetResource { [CmdletBinding()] [OutputType([System.Boolean])] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $DestinationPath, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Uri, [Parameter()] [System.String] $UserAgent, [Parameter()] [Microsoft.Management.Infrastructure.CimInstance[]] $Headers, [Parameter()] [System.Management.Automation.Credential()] [System.Management.Automation.PSCredential] $Credential, [Parameter()] [System.Boolean] $MatchSource = $true, [Parameter()] [System.Uint32] $TimeoutSec, [Parameter()] [System.String] $Proxy, [Parameter()] [System.Management.Automation.Credential()] [System.Management.Automation.PSCredential] $ProxyCredential, [Parameter()] [System.String] [ValidateSet('None', 'SHA1', 'SHA256', 'SHA384', 'SHA512', 'MACTripleDES', 'MD5', 'RIPEMD160')] $ChecksumType = 'None', [Parameter()] [System.String] $Checksum ) # Check whether DestinationPath points to existing file or directory $fileExists = $false $uriFileName = Split-Path -Path $Uri -Leaf $pathItemType = Get-PathItemType -Path $DestinationPath switch ($pathItemType) { 'File' { Write-Verbose -Message ($script:localizedData.DestinationPathIsExistingFile -f $DestinationPath) if ($MatchSource) { $file = Get-Item -Path $DestinationPath # Getting cache. It's cleared every time user runs Start-DscConfiguration $cache = Get-Cache -DestinationPath $DestinationPath -Uri $Uri if ($null -ne $cache ` -and ($cache.LastWriteTime -eq $file.LastWriteTimeUtc) ` -and ($cache.FileSize -eq $file.Length)) { Write-Verbose -Message $script:localizedData.CacheReflectsCurrentState $fileExists = $true } else { Write-Verbose -Message $script:localizedData.CacheIsEmptyOrNotMatchCurrentState } } else { Write-Verbose -Message $script:localizedData.MatchSourceFalse $fileExists = $true } if ($ChecksumType -ine 'None' ` -and -not [String]::IsNullOrEmpty($Checksum) ` -and $fileExists -eq $true) { $fileHashSplat = @{ Path = $DestinationPath Algorithm = $ChecksumType } $getFileHash = Get-FileHash @fileHashSplat $fileHash = $getFileHash.Hash if ($fileHash -ieq $Checksum) { $fileExists = $true } else { # The checksum does not match. The file may match what is in the cached data. Resetting it to false. $fileExists = $false } } } 'Directory' { Write-Verbose -Message ($script:localizedData.DestinationPathIsExistingPath -f $DestinationPath) $expectedDestinationPath = Join-Path -Path $DestinationPath -ChildPath $uriFileName if (Test-Path -Path $expectedDestinationPath) { if ($MatchSource) { $file = Get-Item -Path $expectedDestinationPath $cache = Get-Cache -DestinationPath $expectedDestinationPath -Uri $Uri if ($null -ne $cache -and ($cache.LastWriteTime -eq $file.LastWriteTimeUtc)) { Write-Verbose -Message $script:localizedData.CacheReflectsCurrentState $fileExists = $true } else { Write-Verbose -Message $script:localizedData.CacheIsEmptyOrNotMatchCurrentState } } else { Write-Verbose -Message $script:localizedData.MatchSourceFalse $fileExists = $true } if ($ChecksumType -ine 'None' ` -and -not [String]::IsNullOrEmpty($Checksum) ` -and $fileExists -eq $true) { $fileHashSplat = @{ Path = $expectedDestinationPath Algorithm = $ChecksumType } $getFileHash = Get-FileHash @fileHashSplat $fileHash = $getFileHash.Hash if ($fileHash -ieq $Checksum) { $fileExists = $true } else { # The checksum does not match. The file may match what is in the cached data. Resetting it to false. $fileExists = $false } } } } 'Other' { Write-Verbose -Message ($script:localizedData.DestinationPathUnknownType -f $DestinationPath, $pathItemType) } 'NotExists' { Write-Verbose -Message ($script:localizedData.DestinationPathDoesNotExist -f $DestinationPath) } } $result = $fileExists return $result } <# .SYNOPSIS Checks whether given URI represents specific scheme. .DESCRIPTION Most common schemes: file, http, https, ftp We can also specify logical expressions like: [http|https] .PARAMETER Uri The path of the item to test the scheme of. .PARAMETER Scheme The type of scheme to test the item is. #> function Test-UriScheme { [CmdletBinding()] [OutputType([System.Boolean])] param ( [Parameter(Mandatory = $true)] [System.String] $Uri, [Parameter(Mandatory = $true)] [System.String] $Scheme ) $newUri = $Uri -as [System.URI] return ($null -ne $newUri.AbsoluteURI -and $newUri.Scheme -match $Scheme) } <# .SYNOPSIS Gets type of the item which path points to. .PARAMETER Path The path of the item to return the item type of. .OUTPUTS File, Directory, Other or NotExists. #> function Get-PathItemType { [CmdletBinding()] [OutputType([System.String])] param ( [Parameter(Mandatory = $true)] [System.String] $Path ) $type = $null # Check whether path exists if (Test-Path -Path $path) { # Check type of the path $pathItem = Get-Item -Path $Path $pathItemType = $pathItem.GetType().Name if ($pathItemType -eq 'FileInfo') { $type = 'File' } elseif ($pathItemType -eq 'DirectoryInfo') { $type = 'Directory' } else { $type = 'Other' } } else { $type = 'NotExists' } return $type } <# .SYNOPSIS Converts CimInstance array of type KeyValuePair to hashtable .PARAMETER Array The array of KeyValuePairs to convert to a hashtable. #> function Convert-KeyValuePairArrayToHashtable { [CmdletBinding()] [OutputType([System.Collections.Hashtable])] param ( [Parameter(Mandatory = $true)] [Microsoft.Management.Infrastructure.CimInstance[]] $Array ) $hashtable = @{ } foreach ($item in $Array) { $hashtable += @{ $item.Key = $item.Value } } return $hashtable } <# .SYNOPSIS Gets cache for specific DestinationPath and Uri. .PARAMETER DestinationPath The path to the cache. .PARAMETER Uri The URI of the file to get the cache content for. #> function Get-Cache { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $DestinationPath, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Uri ) $cacheContent = $null $key = Get-CacheKey -DestinationPath $DestinationPath -Uri $Uri $path = Join-Path -Path $script:cacheLocation -ChildPath $key Write-Verbose -Message ($script:localizedData.CacheLookingForPath -f $Path) if (-not (Test-Path -Path $path)) { Write-Verbose -Message ($script:localizedData.CacheNotFoundForPath -f $DestinationPath, $Uri, $Key) $cacheContent = $null } else { $cacheContent = Import-Clixml -Path $path Write-Verbose -Message ($script:localizedData.CacheFoundForPath -f $DestinationPath, $Uri, $Key) } return $cacheContent } <# .SYNOPSIS Creates or updates cache for specific DestinationPath and Uri. .PARAMETER DestinationPath The path to the cache. .PARAMETER Uri The URI of the file to update the cache for. .PARAMETER Uri The content of the file to update in the cache. #> function Update-Cache { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $DestinationPath, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Uri, [Parameter(Mandatory = $true)] [System.Object] $InputObject ) $key = Get-CacheKey -DestinationPath $DestinationPath -Uri $Uri $path = Join-Path -Path $script:cacheLocation -ChildPath $key if (-not (Test-Path -Path $script:cacheLocation)) { $null = New-Item -ItemType Directory -Path $script:cacheLocation } Write-Verbose -Message ($script:localizedData.UpdatingCache -f $DestinationPath, $Uri, $Key) Export-Clixml -Path $path -InputObject $InputObject -Force } <# .SYNOPSIS Returns cache key for given parameters. .PARAMETER DestinationPath The path to the cache. .PARAMETER Uri The URI of the file to get the cache key for. #> function Get-CacheKey { [CmdletBinding()] [OutputType([System.String])] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $DestinationPath, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Uri ) return [System.String]::Join('', @($DestinationPath, $Uri)).GetHashCode().ToString() } Export-ModuleMember -Function Get-TargetResource, Set-TargetResource, Test-TargetResource |