Metadata.psm1
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param( $Converters = @{} ) $ModuleManifestExtension = ".psd1" function Test-PSVersion { <# .Synopsis Test the PowerShell Version .Description This function exists so I can do things differently on older versions of PowerShell. But the reason I test in a function is that I can mock the Version to test the alternative code. .Example if(Test-PSVersion -ge 3.0) { ls | where Length -gt 12mb } else { ls | Where { $_.Length -gt 12mb } } This is just a trivial example to show the usage (you wouldn't really bother for a where-object call) #> [CmdletBinding()] param( [Version]$Version = $PSVersionTable.PSVersion, [Version]$lt, [Version]$le, [Version]$gt, [Version]$ge, [Version]$eq, [Version]$ne ) Write-Verbose "Version $Version" $all = @( if($lt) { $Version -lt $lt } if($gt) { $Version -gt $gt } if($le) { $Version -le $le } if($ge) { $Version -ge $ge } if($eq) { $Version -eq $eq } if($ne) { $Version -ne $ne } ) $all -notcontains $false } function Add-MetadataConverter { <# .Synopsis Add a converter functions for serialization and deserialization to metadata .Description Add-MetadataConverter allows you to map: * a type to a scriptblock which can serialize that type to metadata (psd1) * define a name and scriptblock as a function which will be whitelisted in metadata (for ConvertFrom-Metadata and Import-Metadata) The idea is to give you a way to extend the serialization capabilities if you really need to. .Example Add-MetadataCOnverter @{ [bool] = { if($_) { '$True' } else { '$False' } } } Shows a simple example of mapping bool to a scriptblock that serializes it in a way that's inherently parseable by PowerShell. This exact converter is already built-in to the Metadata module, so you don't need to add it. .Example Add-MetadataConverter @{ [Uri] = { "Uri '$_' " } "Uri" = { param([string]$Value) [Uri]$Value } } Shows how to map a function for serializing Uri objects as strings with a Uri function that just casts them. Normally you wouldn't need to do that for Uri, since they output strings natively, and it's perfectly logical to store Uris as strings and only cast them when you really need to. #> [CmdletBinding()] param( # A hashtable of types to serializer scriptblocks, or function names to scriptblock definitions [Parameter(Mandatory = $True)] [hashtable]$Converters ) if($Converters.Count) { switch ($Converters.Keys.GetEnumerator()) { {$Converters.$_ -isnot [ScriptBlock]} { Write-Error "Ignoring $_ converter, value must be ScriptBlock" continue } {$_ -is [String]} { Write-Verbose "Adding function $_" Set-Content "function:script:$_" $Converters.$_ continue } {$_ -is [Type]} { Write-Verbose "Adding serializer for $($_.FullName)" $MetadataConverters.$_ = $Converters.$_ continue } default { Write-Error "Unsupported key type in Converters: $_ is $($_.GetType())" } } } } function ConvertTo-Metadata { [CmdletBinding()] param( [Parameter(ValueFromPipeline = $True)] $InputObject, [Hashtable]$Converters = @{} ) begin { $t = " " $Script:OriginalMetadataConverters = $Script:MetadataConverters.Clone() Add-MetadataConverter $Converters } end { $Script:MetadataConverters = $Script:OriginalMetadataConverters.Clone() } process { # Write-verbose ("Type {0}" -f $InputObject.GetType().FullName) if($InputObject -eq $Null) { # Write-verbose "Null" '""' } elseif( $InputObject -is [Int16] -or $InputObject -is [Int32] -or $InputObject -is [Int64] -or $InputObject -is [Double] -or $InputObject -is [Decimal] -or $InputObject -is [Byte] ) { # Write-verbose "Numbers" "$InputObject" } elseif($InputObject -is [String]) { # Write-verbose "String" "'$InputObject'" } elseif($InputObject -is [DateTime]) { # Write-verbose "DateTime" "DateTime '{0}'" -f $InputObject.ToString('o') } elseif($InputObject -is [DateTimeOffset]) { # Write-verbose "DateTime" "DateTimeOffset '{0}'" -f $InputObject.ToString('o') } elseif($InputObject -is [System.Collections.IDictionary]) { # Write-verbose "Dictionary" #Write-verbose "Dictionary:`n $($InputObject|ft|out-string -width 110)" "@{{`n$t{0}`n}}" -f ($( ForEach($key in @($InputObject.Keys)) { if("$key" -match '^(\w+|-?\d+\.?\d*)$') { "$key = " + (ConvertTo-Metadata $InputObject.($key)) } else { "'$key' = " + (ConvertTo-Metadata $InputObject.($key)) } }) -split "`n" -join "`n$t") } elseif($InputObject -is [System.Collections.IEnumerable]) { # Write-verbose "Enumerable" "@($($(ForEach($item in @($InputObject)) { ConvertTo-Metadata $item }) -join ','))" } elseif($InputObject.GetType().FullName -eq 'System.Management.Automation.PSCustomObject') { # Write-verbose "PSCustomObject" "PSObject @{{`n$t{0}`n}}" -f ($( ForEach($key in $InputObject | Get-Member -Type Properties | Select -Expand Name) { if("$key" -match '^(\w+|-?\d+\.?\d*)$') { "$key = " + (ConvertTo-Metadata $InputObject.($key)) } else { "'$key' = " + (ConvertTo-Metadata $InputObject.($key)) } } ) -split "`n" -join "`n$t") } elseif($MetadataConverters.ContainsKey($InputObject.GetType())) { # Write-verbose "Using type converter for $($InputObject.GetType())" % $MetadataConverters.($InputObject.GetType()) -InputObject $InputObject } else { # Write-verbose "Unknown!" # $MetadataConverters.Keys | %{ Write-Verbose "We have converters for: $($_.Name)" } Write-Warning "$($InputObject.GetType().FullName) is not serializable. Serializing as string" "'{0}'" -f $InputObject.ToString() } } } function ConvertFrom-Metadata { [CmdletBinding()] param( [Parameter(ValueFromPipelineByPropertyName="True", Position=0)] [Alias("PSPath")] $InputObject, [Hashtable]$Converters = @{}, $ScriptRoot = '$PSScriptRoot' ) begin { $Script:OriginalMetadataConverters = $Script:MetadataConverters.Clone() Add-MetadataConverter $Converters [string[]]$ValidCommands = @("PSObject", "GUID", "DateTime", "DateTimeOffset", "ConvertFrom-StringData", "ConvertTo-SecureString", "Join-Path") + @($MetadataConverters.Keys.GetEnumerator()) [string[]]$ValidVariables = "PSScriptRoot", "ScriptRoot", "PoshCodeModuleRoot","PSCulture","PSUICulture","True","False","Null" } end { $Script:MetadataConverters = $Script:OriginalMetadataConverters.Clone() } process { $ErrorActionPreference = "Stop" $Tokens = $Null; $ParseErrors = $Null if(Test-PSVersion -lt "3.0") { Write-Verbose "$InputObject" if(!(Test-Path $InputObject -ErrorAction SilentlyContinue)) { $Path = [IO.path]::ChangeExtension([IO.Path]::GetTempFileName(), $ModuleManifestExtension) Set-Content -Path $Path $InputObject $InputObject = $Path } elseif(!"$InputObject".EndsWith($ModuleManifestExtension)) { $Path = [IO.path]::ChangeExtension([IO.Path]::GetTempFileName(), $ModuleManifestExtension) Copy-Item "$InputObject" "$Path" $InputObject = $Path } $Result = $null Import-LocalizedData -BindingVariable Result -BaseDirectory (Split-Path $InputObject) -FileName (Split-Path $InputObject -Leaf) -SupportedCommand $ValidCommands return $Result } if(Test-Path $InputObject -ErrorAction SilentlyContinue) { $AST = [System.Management.Automation.Language.Parser]::ParseFile( (Convert-Path $InputObject), [ref]$Tokens, [ref]$ParseErrors) $ScriptRoot = Split-Path $InputObject } else { $ScriptRoot = $PoshCodeModuleRoot $OFS = "`n" $InputObject = "$InputObject" -replace "# SIG # Begin signature block(?s:.*)" $AST = [System.Management.Automation.Language.Parser]::ParseInput($InputObject, [ref]$Tokens, [ref]$ParseErrors) } if($ParseErrors -ne $null) { ThrowError -Exception (New-Object System.Management.Automation.ParseException (,[System.Management.Automation.Language.ParseError[]]$ParseErrors)) -ErrorId "Metadata Error" -Category "ParserError" -TargetObject $InputObject } $Tokens += $Tokens | Where-Object { "StringExpandable" -eq $_.Kind } | Select-Object -Expand NestedTokens if($scriptroots = @($Tokens | Where-Object { ("Variable" -eq $_.Kind) -and ($_.Name -eq "PSScriptRoot") } | ForEach-Object { $_.Extent } )) { $ScriptContent = $Ast.ToString() for($r = $scriptroots.count - 1; $r -ge 0; $r--) { $ScriptContent = $ScriptContent.Remove($scriptroots[$r].StartOffset, ($scriptroots[$r].EndOffset - $scriptroots[$r].StartOffset)).Insert($scriptroots[$r].StartOffset,'$ScriptRoot') } $AST = [System.Management.Automation.Language.Parser]::ParseInput($ScriptContent, [ref]$Tokens, [ref]$ParseErrors) } $Script = $AST.GetScriptBlock() try { $Script.CheckRestrictedLanguage( $ValidCommands, $ValidVariables, $true ) } catch { ThrowError -Exception $_.Exception.InnerException -ErrorId "Metadata Error" -Category "InvalidData" -TargetObject $Script } $Mode, $ExecutionContext.SessionState.LanguageMode = $ExecutionContext.SessionState.LanguageMode, "RestrictedLanguage" try { $Script.InvokeReturnAsIs(@()) } finally { $ExecutionContext.SessionState.LanguageMode = $Mode } } } function Import-Metadata { <# .Synopsis Creates a data object from the items in a Metadata file (e.g. a .psd1) #> [CmdletBinding()] param( [Parameter(ValueFromPipeline=$true, Mandatory=$true, ValueFromPipelineByPropertyName=$true)] [Alias("PSPath","Content")] [string]$Path, [Hashtable]$Converters = @{} ) process { $ModuleInfo = $null if(Test-Path $Path) { Write-Verbose "Importing Metadata file from `$Path: $Path" if(!(Test-Path $Path -PathType Leaf)) { $Path = Join-Path $Path ((Split-Path $Path -Leaf) + $ModuleManifestExtension) } } if(!(Test-Path $Path)) { WriteError -ExceptionType System.Management.Automation.ItemNotFoundException ` -Message "Can't find settings file $Path" ` -ErrorId "PathNotFound,Metadata\Import-Metadata" ` -Category "ObjectNotFound" return } try { ConvertFrom-Metadata -InputObject $Path -Converters $Converters } catch { ThrowError $_ } } } function Export-Metadata { <# .Synopsis Creates a metadata file from a simple object .Description Converts simple objects to psd1 data files Note that exportable data is limited by the rules of data sections (see about_Data_Sections) and the available MetadataConverters (see Add-MetadataConverter) The only things inherently importable in PowerShell metadata files are Strings, Booleans, and Numbers ... and Arrays or Hashtables where the values (and keys) are all strings, booleans, or numbers. Note: this function and the matching Import-Metadata are extensible, and have included support for PSCustomObject, Guid, Version, etc. #> [CmdletBinding()] param( # Specifies the path to the PSD1 output file. [Parameter(Mandatory=$true, Position=0)] $Path, # comments to place on the top of the file (to explain settings or whatever for people who might edit it by hand) [string[]]$CommentHeader, # Specifies the objects to export as metadata structures. # Enter a variable that contains the objects or type a command or expression that gets the objects. # You can also pipe objects to Export-Metadata. [Parameter(Mandatory=$true, ValueFromPipeline=$true)] $InputObject, [Hashtable]$Converters = @{}, # If set, output the nuspec file [Switch]$Passthru ) begin { $data = @() } process { $data += @($InputObject) } end { # Avoid arrays when they're not needed: if($data.Count -eq 1) { $data = $data[0] } Set-Content -Path $Path -Value ((@($CommentHeader) + @(ConvertTo-Metadata -InputObject $data -Converters $Converters)) -Join "`n") if($Passthru) { Get-Item $Path } } } # These functions are simple helpers for use in data sections (see about_data_sections) and .psd1 files (see ConvertFrom-Metadata) function PSObject { <# .Synopsis Creates a new PSCustomObject with the specified properties .Description This is just a wrapper for the PSObject constructor with -Property $Value It exists purely for the sake of psd1 serialization .Parameter Value The hashtable of properties to add to the created objects #> param([hashtable]$Value) New-Object System.Management.Automation.PSObject -Property $Value } function DateTime { <# .Synopsis Creates a DateTime with the specified value .Description This is basically just a type cast to DateTime, the string needs to be castable. It exists purely for the sake of psd1 serialization .Parameter Value The DateTime value, preferably from .Format('o'), the .Net round-trip format #> param([string]$Value) [DateTime]$Value } function DateTimeOffset { <# .Synopsis Creates a DateTimeOffset with the specified value .Description This is basically just a type cast to DateTimeOffset, the string needs to be castable. It exists purely for the sake of psd1 serialization .Parameter Value The DateTimeOffset value, preferably from .Format('o'), the .Net round-trip format #> param([string]$Value) [DateTimeOffset]$Value } function PSCredential { <# .Synopsis Creates a new PSCredential with the specified properties .Description This is just a wrapper for the PSObject constructor with -Property $Value It exists purely for the sake of psd1 serialization .Parameter Value The hashtable of properties to add to the created objects #> param([string]$UserName, [string]$Password) New-Object PSCredential $UserName, (ConvertTo-SecureString $Password) } $MetadataConverters = @{} if($Converters -is [Collections.IDictionary]) { Add-MetadataConverter $Converters } # The OriginalMetadataConverters Add-MetadataConverter @{ [bool] = { if($_) { '$True' } else { '$False' } } [Version] = { "'$_'" } [PSCredential] = { 'PSCredential "{0}" "{1}"' -f $_.UserName, (ConvertFrom-SecureString $_.Password) } [SecureString] = { "ConvertTo-SecureString {0}" -f (ConvertFrom-SecureString $_) } # This GUID is here instead of as a function # just to make sure the tests can validate the converter hashtables Guid = { <# .Synopsis Creates a GUID with the specified value .Description This is basically just a type cast to GUID. It exists purely for the sake of psd1 serialization .Parameter Value The GUID value. #> param([string]$Value) [Guid]$Value } [Guid] = { "Guid '$_'" } } $Script:OriginalMetadataConverters = $MetadataConverters.Clone() function Optimize-Object { <# .Synopsis Remove duplicate data from an object .Description Removes values from the delta object that are in the base object #> } function Update-Object { <# .Synopsis Update a custom object (or hashtable) with new values .Description Updates the InputObject with data from the update object. .Example Update-Object -Input @{ One = "Un" Two = "Dos" } -Update @{ One = "Uno" Three = "Tres" } Updates the InputObject with the values in the UpdateObject will return the following object: @{ One = "Uno" Two = "Dos" Three = "Tres" } #> [CmdletBinding()] param( [AllowNull()] [Parameter(Position=0, Mandatory=$true)] $UpdateObject, [Parameter(ValueFromPipeline=$true, Mandatory = $true)] $InputObject ) process { Write-Verbose "INPUT OBJECT:" Write-Verbose (($InputObject | out-string -stream | % TrimEnd) -join "`n") Write-Verbose "Update OBJECT:" Write-Verbose (($UpdateObject | out-string -stream | % TrimEnd) -join "`n") if($InputObject -eq $null) { return } if($InputObject -is [System.Collections.IDictionary]) { $OutputObject = $InputObject } else { # Create a PSCustomObject with all the properties $OutputObject = $InputObject | Select-Object * } if(!$UpdateObject) { Write-Output $OutputObject return } if($UpdateObject -is [System.Collections.IDictionary]) { $Keys = $UpdateObject.Keys } else { $Keys = @($UpdateObject | gm -type Properties | Where { $p1 -notcontains $_.Name } | select -expand Name) } Write-Debug "Keys: $Keys" ForEach($key in $Keys) { if(($OutputObject.$Key -is [System.Collections.IDictionary] -or $OutputObject.$Key -is [PSObject]) -and ($InputObject.$Key -is [System.Collections.IDictionary] -or $InputObject.$Key -is [PSObject])) { $Value = Update-Object -InputObject $InputObject.$Key -UpdateObject $UpdateObject.$Key } else { $Value = $UpdateObject.$Key } if($OutputObject -is [System.Collections.IDictionary]) { $OutputObject.$key = $Value } else { $OutputObject = Add-Member -in $OutputObject -type NoteProperty -name $key -value $Value -Passthru -Force } } $Keys = $OutputObject.Keys Write-Debug "Keys: $Keys" Write-Output $OutputObject } } # Utility to throw an errorrecord function ThrowError { param ( [Parameter()] [ValidateNotNullOrEmpty()] [System.Management.Automation.PSCmdlet] $Cmdlet = $((Get-Variable -Scope 1 PSCmdlet).Value), [Parameter(Mandatory = $true, ParameterSetName="ExistingException", Position=1, ValueFromPipeline=$true, ValueFromPipelineByPropertyName=$true)] [Parameter(ParameterSetName="NewException")] [ValidateNotNullOrEmpty()] [System.Exception] $Exception, [Parameter(ParameterSetName="NewException", Position=2)] [ValidateNotNullOrEmpty()] [System.String] $ExceptionType="System.Management.Automation.RuntimeException", [Parameter(Mandatory = $true, ParameterSetName="NewException", Position=3)] [ValidateNotNullOrEmpty()] [System.String] $Message, [Parameter(Mandatory = $false)] [System.Object] $TargetObject, [Parameter(Mandatory = $true, ParameterSetName="ExistingException", Position=10)] [Parameter(Mandatory = $true, ParameterSetName="NewException", Position=10)] [ValidateNotNullOrEmpty()] [System.String] $ErrorId, [Parameter(Mandatory = $true, ParameterSetName="ExistingException", Position=11)] [Parameter(Mandatory = $true, ParameterSetName="NewException", Position=11)] [ValidateNotNull()] [System.Management.Automation.ErrorCategory] $Category, [Parameter(Mandatory = $true, ParameterSetName="Rethrow", Position=1)] [System.Management.Automation.ErrorRecord]$ErrorRecord ) process { if(!$ErrorRecord) { if($PSCmdlet.ParameterSetName -eq "NewException") { if($Exception) { $Exception = New-Object $ExceptionType $Message, $Exception } else { $Exception = New-Object $ExceptionType $Message } } $errorRecord = New-Object System.Management.Automation.ErrorRecord $Exception, $ErrorId, $Category, $TargetObject } $Cmdlet.ThrowTerminatingError($errorRecord) } } # Utility to throw an errorrecord function WriteError { param ( [Parameter()] [ValidateNotNullOrEmpty()] [System.Management.Automation.PSCmdlet] $Cmdlet = $((Get-Variable -Scope 1 PSCmdlet).Value), [Parameter(Mandatory = $true, ParameterSetName="ExistingException", Position=1, ValueFromPipeline=$true, ValueFromPipelineByPropertyName=$true)] [Parameter(ParameterSetName="NewException")] [ValidateNotNullOrEmpty()] [System.Exception] $Exception, [Parameter(ParameterSetName="NewException", Position=2)] [ValidateNotNullOrEmpty()] [System.String] $ExceptionType="System.Management.Automation.RuntimeException", [Parameter(Mandatory = $true, ParameterSetName="NewException", Position=3)] [ValidateNotNullOrEmpty()] [System.String] $Message, [Parameter(Mandatory = $false)] [System.Object] $TargetObject, [Parameter(Mandatory = $true, Position=10)] [ValidateNotNullOrEmpty()] [System.String] $ErrorId, [Parameter(Mandatory = $true, Position=11)] [ValidateNotNull()] [System.Management.Automation.ErrorCategory] $Category, [Parameter(Mandatory = $true, ParameterSetName="Rethrow", Position=1)] [System.Management.Automation.ErrorRecord]$ErrorRecord ) process { if(!$ErrorRecord) { if($PSCmdlet.ParameterSetName -eq "NewException") { if($Exception) { $Exception = New-Object $ExceptionType $Message, $Exception } else { $Exception = New-Object $ExceptionType $Message } } $errorRecord = New-Object System.Management.Automation.ErrorRecord $Exception, $ErrorId, $Category, $TargetObject } $Cmdlet.WriteError($errorRecord) } } |