SignTool/SignTool.psm1

using namespace System
using namespace System.Collections.Generic

function Format-SignToolArgumentList {
    param (
        [Parameter(Mandatory)]
        [List[string]]$FileList,

        [Parameter(Mandatory)]
        [string]$FileDigest,

        [Parameter()]
        [AllowEmptyString()]
        [string]$TimestampRfc3161,

        [Parameter()]
        [AllowEmptyString()]
        [string]$TimestampDigest,

        [Parameter(Mandatory)]
        [string]$DlibFilePath,

        [Parameter(Mandatory)]
        [string]$MetadataFilePath,

        [Parameter()]
        [switch]$AppendSignature = $false,

        [Parameter()]
        [AllowEmptyString()]
        [string]$Description,

        [Parameter()]
        [AllowEmptyString()]
        [string]$DescriptionUrl,

        [Parameter()]
        [AllowEmptyString()]
        [string]$GenerateDigestPath,

        [Parameter()]
        [switch]$GenerateDigestXml = $false,

        [Parameter()]
        [AllowEmptyString()]
        [string]$IngestDigestPath,

        [Parameter()]
        [switch]$SignDigest = $false,

        [Parameter()]
        [switch]$GeneratePageHashes = $false,

        [Parameter()]
        [switch]$SuppressPageHashes = $false,

        [Parameter()]
        [switch]$GeneratePkcs7 = $false,

        [Parameter()]
        [AllowEmptyString()]
        [string]$Pkcs7Options,

        [Parameter()]
        [AllowEmptyString()]
        [string]$Pkcs7Oid,

        [Parameter()]
        [AllowEmptyString()]
        [string]$EnhancedKeyUsage
    )

    $result = [List[string]]::new()
    $result.Add("sign")
    $result.Add("/v")
    $result.Add("/debug")

    $result.Add("/fd")
    $result.Add($FileDigest)

    if ($TimestampRfc3161) {
        $result.Add("/tr")
        $result.Add($TimestampRfc3161)
    }

    if ($TimestampDigest) {
        $result.Add("/td")
        $result.Add($TimestampDigest)
    }

    $result.Add("/dlib")
    $result.Add("`"$DlibFilePath`"")

    $result.Add("/dmdf")
    $result.Add("`"$MetadataFilePath`"")

    if ($AppendSignature) {
        $result.Add("/as")
    }

    if ($Description) {
        $result.Add("/d")
        $result.Add("`"$Description`"")
    }

    if ($DescriptionUrl) {
        $result.Add("/du")
        $result.Add("`"$DescriptionUrl`"")
    }

    if ($GenerateDigestPath) {
        $result.Add("/dg")
        $result.Add("`"$GenerateDigestPath`"")
    }

    if ($GenerateDigestXml) {
        $result.Add("/dxml")
    }

    if ($IngestDigestPath) {
        $result.Add("/di")
        $result.Add("`"$IngestDigestPath`"")
    }

    if ($SignDigest) {
        $result.Add("/ds")
    }

    if ($GeneratePageHashes) {
        $result.Add("/ph")
    }

    if ($SuppressPageHashes) {
        $result.Add("/nph")
    }

    if ($GeneratePkcs7) {
        $result.Add("/p7")
    }

    if ($Pkcs7Options) {
        $result.Add("/p7ce")
        $result.Add("`"$Pkcs7Options`"")
    }

    if ($Pkcs7Oid) {
        $result.Add("/p7co")
        $result.Add("`"$Pkcs7Oid`"")
    }

    if ($EnhancedKeyUsage) {
        $result.Add("/u")
        $result.Add("`"$EnhancedKeyUsage`"")
    }

    $result.AddRange($FileList)

    return $result
}

function Invoke-SignTool
{
    param (
        [Parameter(Mandatory)]
        [string]$SignToolFolderPath,

        [Parameter(Mandatory)]
        [List[string]]$SignToolArguments,

        [Parameter(Mandatory)]
        [int]$Timeout
    )

    $signToolPath = Join-Path -Path $SignToolFolderPath -ChildPath "signtool.exe"

    Write-Information -MessageData "`tExecuting signtool.exe: $signToolPath $SignToolArguments" -InformationAction Continue

    $startProcessParams = @{
        FilePath = $signToolPath
        ArgumentList = $SignToolArguments
        NoNewWindow = $true
        PassThru = $true
    }
    $process = Start-Process @startProcessParams

    try
    {
        Wait-Process -InputObject $process -Timeout $Timeout -ErrorAction Stop
    }
    catch [TimeoutException]
    {
        Stop-Process -Id $process.Id -Force -ErrorAction Stop
        $process.WaitForExit()
        $timeoutError = "The Artifact Signing service could not finish the request within the"
        $timeoutError += " allotted time of $Timeout seconds. This may happen if you are signing"
        $timeoutError += " a large number of files. You can try to increase the value of the"
        $timeoutError += " 'Timeout' parameter which is 300 seconds by default."
        throw $timeoutError
    }

    return $process.ExitCode
}

function Invoke-SignToolBatch
{
    param (
        [Parameter(Mandatory)]
        [string]$SignToolFolderPath,

        [Parameter(Mandatory)]
        [List[List[string]]]$ArgumentLists,

        [Parameter(Mandatory)]
        [ValidateRange(1, 256)]
        [int]$MaxConcurrency,

        [Parameter(Mandatory)]
        [int]$Timeout
    )

    $signToolPath = Join-Path -Path $SignToolFolderPath -ChildPath "signtool.exe"
    $workers = [List[object]]::new()
    $nextBatch = 0

    try
    {
        while ($nextBatch -lt $ArgumentLists.Count -or $workers.Count -gt 0)
        {
            for ($index = $workers.Count - 1; $index -ge 0; $index--)
            {
                $worker = $workers[$index]
                $process = $worker.Process
                if ($process.HasExited)
                {
                    $process.WaitForExit()
                    $exitCode = $process.ExitCode
                    if ($exitCode -ne 0 -and $exitCode -ne 2)
                    {
                        throw "SignTool failed with exit code $exitCode"
                    }
                    $process.Dispose()
                    $workers.RemoveAt($index)
                }
                elseif ($worker.Timer.Elapsed.TotalSeconds -ge $Timeout)
                {
                    throw "SignTool batch $($worker.Batch) exceeded the timeout of $Timeout seconds."
                }
            }

            while ($nextBatch -lt $ArgumentLists.Count -and $workers.Count -lt $MaxConcurrency)
            {
                $arguments = $ArgumentLists[$nextBatch]
                Write-Information -MessageData "Starting SignTool batch $($nextBatch + 1) of $($ArgumentLists.Count)." -InformationAction Continue
                Write-Information -MessageData "`tExecuting signtool.exe: $signToolPath $arguments" -InformationAction Continue
                $timer = [System.Diagnostics.Stopwatch]::StartNew()
                $process = Start-Process -FilePath $signToolPath -ArgumentList $arguments -NoNewWindow -PassThru -ErrorAction Stop
                $workers.Add([pscustomobject]@{
                    Process = $process
                    Timer = $timer
                    Batch = $nextBatch + 1
                })
                $nextBatch++
            }

            if ($workers.Count -gt 0)
            {
                Start-Sleep -Milliseconds 50
            }
        }
    }
    finally
    {
        $cleanupError = $null
        foreach ($worker in $workers)
        {
            $process = $worker.Process
            try
            {
                if (-not $process.HasExited)
                {
                    Stop-Process -Id $process.Id -Force -ErrorAction Stop
                    $process.WaitForExit()
                }
            }
            catch
            {
                if (-not $process.HasExited)
                {
                    $cleanupError = $_
                }
            }
            finally
            {
                $process.Dispose()
            }
        }
        if ($null -ne $cleanupError)
        {
            throw $cleanupError
        }
    }
}

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