DSCResources/DSC_ReplaceText/DSC_ReplaceText.psm1
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Set-StrictMode -Version 'Latest' $modulePath = Join-Path -Path (Split-Path -Path (Split-Path -Path $PSScriptRoot -Parent) -Parent) -ChildPath 'Modules' # Import the Networking Common Modules Import-Module -Name (Join-Path -Path $modulePath ` -ChildPath (Join-Path -Path 'FileContentDsc.Common' ` -ChildPath 'FileContentDsc.Common.psm1')) Import-Module -Name (Join-Path -Path $modulePath -ChildPath 'DscResource.Common') # Import Localization Strings $script:localizedData = Get-LocalizedData -DefaultUICulture 'en-US' <# .SYNOPSIS Retrieves the current state of the text file. .PARAMETER Path The path to the text file to replace the string in. .PARAMETER Search The RegEx string to use to search the text file. #> function Get-TargetResource { [OutputType([Hashtable])] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Path, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Search ) Assert-ParametersValid @PSBoundParameters $fileContent = Get-Content -Path $Path -Raw $fileEncoding = Get-FileEncoding $Path Write-Verbose -Message ($script:localizedData.SearchForTextMessage -f ` $Path, $Search) $text = '' # Search the file content for any matches $results = [regex]::Matches($fileContent, $Search) if ($results.Count -eq 0) { # No matches found - already in state Write-Verbose -Message ($script:localizedData.StringNotFoundMessage -f ` $Path, $Search) } else { $text = ($results.Value -join ',') Write-Verbose -Message ($script:localizedData.StringMatchFoundMessage -f ` $Path, $Search, $text) } # if return @{ Path = $Path Search = $Search Type = 'Text' Text = $text Encoding = $fileEncoding } } <# .SYNOPSIS Replaces text the matches the RegEx in the file. .PARAMETER Path The path to the text file to replace the string in. .PARAMETER Search The RegEx string to use to search the text file. .PARAMETER Type Specifies the value type to use as the replacement string. Defaults to 'Text'. .PARAMETER Text The text to replace the text identifed by the RegEx. Only used when Type is set to 'Text'. .PARAMETER Secret The secret text to replace the text identified by the RegEx. Only used when Type is set to 'Secret'. .PARAMETER AllowAppend Specifies to append text to the file being modified. Adds the ability to add a configuration entry. .PARAMETER Encoding Specifies the file encoding. Defaults to ASCII. #> function Set-TargetResource { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Path, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Search, [Parameter()] [ValidateSet('Text', 'Secret')] [System.String] $Type = 'Text', [Parameter()] [System.String] $Text, [Parameter()] [System.Management.Automation.PSCredential] [System.Management.Automation.Credential()] $Secret, [Parameter()] [System.Boolean] $AllowAppend = $false, [Parameter()] [ValidateSet("ASCII", "BigEndianUnicode", "BigEndianUTF32", "UTF8", "UTF32")] [System.String] $Encoding ) Assert-ParametersValid @PSBoundParameters $fileContent = Get-Content -Path $Path -Raw -ErrorAction SilentlyContinue $fileEncoding = Get-FileEncoding $Path $fileProperties = @{ Path = $Path NoNewline = $true Force = $true } if ($Type -eq 'Secret') { Write-Verbose -Message ($script:localizedData.StringReplaceSecretMessage -f ` $Path) $Text = $Secret.GetNetworkCredential().Password } elseif ($PSBoundParameters.ContainsKey('Encoding')) { if ($Encoding -eq $fileEncoding) { Write-Verbose -Message ($script:localizedData.StringReplaceTextMessage -f ` $Path, $Text) } else { Write-Verbose -Message ($script:localizedData.StringReplaceTextMessage -f ` $Path, $Text) # Add encoding parameter and value to the hashtable $fileProperties.Add('Encoding', $Encoding) } } if ($null -eq $fileContent) { # Configuration file does not exist $fileContent = $Text } elseif ([regex]::Matches($fileContent, $Search).Count -eq 0 -and $AllowAppend -eq $true) { # Configuration file exists but Text does not exist so lets add it $fileContent = Add-ConfigurationEntry -FileContent $fileContent -Text $Text } else { # Configuration file exists but Text not in a desired state so lets update it $fileContent = $fileContent -Replace $Search, $Text } $fileProperties.Add('Value', $fileContent) Set-Content @fileProperties } <# .SYNOPSIS Tests if any text in the file matches the RegEx. .PARAMETER Path The path to the text file to replace the string in. .PARAMETER Search The RegEx string to use to search the text file. .PARAMETER Type Specifies the value type to use as the replacement string. Defaults to 'Text'. .PARAMETER Text The text to replace the text identifed by the RegEx. Only used when Type is set to 'Text'. .PARAMETER Secret The secret text to replace the text identified by the RegEx. Only used when Type is set to 'Secret'. .PARAMETER AllowAppend Specifies to append text to the file being modified. Adds the ability to add a configuration entry. .PARAMETER Encoding Specifies the file encoding. Defaults to ASCII. #> function Test-TargetResource { [OutputType([System.Boolean])] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Path, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Search, [Parameter()] [ValidateSet('Text', 'Secret')] [System.String] $Type = 'Text', [Parameter()] [System.String] $Text, [Parameter()] [System.Management.Automation.PSCredential] [System.Management.Automation.Credential()] $Secret, [Parameter()] [System.Boolean] $AllowAppend = $false, [Parameter()] [ValidateSet("ASCII", "BigEndianUnicode", "BigEndianUTF32", "UTF8", "UTF32")] [System.String] $Encoding ) Assert-ParametersValid @PSBoundParameters # Check if file being managed exists. If not return $false. if (-not (Test-Path -Path $Path)) { return $false } $fileContent = Get-Content -Path $Path -Raw $fileEncoding = Get-FileEncoding $Path Write-Verbose -Message ($script:localizedData.SearchForTextMessage -f ` $Path, $Search) # Search the file content for any matches $results = [regex]::Matches($fileContent, $Search) if ($results.Count -eq 0) { if ($AllowAppend -eq $true) { # No matches found - but we want to append Write-Verbose -Message ($script:localizedData.StringNotFoundMessageAppend -f ` $Path, $Search) return $false } if ($PSBoundParameters.ContainsKey('Encoding')) { if ($Encoding -eq $fileEncoding) { # No matches found and encoding is in desired state Write-Verbose -Message ($script:localizedData.StringNotFoundMessage -f ` $Path, $Search) return $true } else { # No matches found but encoding is not in desired state Write-Verbose -Message ($script:localizedData.FileEncodingNotInDesiredState -f ` $fileEncoding, $Encoding) return $false } } } # Flag to signal whether settings are correct [System.Boolean] $desiredConfigurationMatch = $true if ($Type -eq 'Secret') { $Text = $Secret.GetNetworkCredential().Password } # if foreach ($result in $results) { if ($result.Value -ne $Text) { $desiredConfigurationMatch = $false } # if } # foreach if ($desiredConfigurationMatch) { Write-Verbose -Message ($script:localizedData.StringNoReplacementMessage -f ` $Path, $Search) } else { Write-Verbose -Message ($script:localizedData.StringReplacementRequiredMessage -f ` $Path, $Search) } # if return $desiredConfigurationMatch } <# .SYNOPSIS Validates the parameters that have been passed are valid. If they are not valid then an exception will be thrown. .PARAMETER Path The path to the text file to replace the string in. .PARAMETER Search The RegEx string to use to search the text file. .PARAMETER Type Specifies the value type to use as the replacement string. Defaults to 'Text'. .PARAMETER Text The text to replace the text identifed by the RegEx. Only used when Type is set to 'Text'. .PARAMETER Secret The secret text to replace the text identified by the RegEx. Only used when Type is set to 'Secret'. .PARAMETER Encoding Specifies the file encoding. Defaults to ASCII. #> function Assert-ParametersValid { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Path, [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $Search, [Parameter()] [ValidateSet('Text', 'Secret')] [System.String] $Type = 'Text', [Parameter()] [System.String] $Text, [Parameter()] [System.Management.Automation.PSCredential] [System.Management.Automation.Credential()] $Secret, [Parameter()] [System.Boolean] $AllowAppend = $false, [Parameter()] [ValidateSet("ASCII", "BigEndianUnicode", "BigEndianUTF32", "UTF8", "UTF32")] [System.String] $Encoding ) # Does the file's parent path exist? $parentPath = Split-Path -Path $Path -Parent if (-not (Test-Path -Path $parentPath)) { New-InvalidArgumentException ` -Message ($script:localizedData.FileParentNotFoundError -f $parentPath) ` -ArgumentName 'Path' } # if } <# .SYNOPSIS Uses the stringBuilder class to append a configuration entry to the existing file content. .PARAMETER FileContent The existing file content of the configuration file. .PARAMETER Text The text to append to the end of the FileContent. #> function Add-ConfigurationEntry { [OutputType([System.String])] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.String] $FileContent, [Parameter(Mandatory = $true)] [System.String] $Text ) if ($FileContent -match '\n$' -and $FileContent -notmatch '\r\n$') { # default *nix line ending $detectedNewLineFormat = "`n" } else { # default Windows line ending $detectedNewLineFormat = "`r`n" } $stringBuilder = New-Object -TypeName System.Text.StringBuilder $null = $stringBuilder.Append($FileContent) $null = $stringBuilder.Append($Text) $null = $stringBuilder.Append($detectedNewLineFormat) return $stringBuilder.ToString() } Export-ModuleMember -Function *-TargetResource |