Framework/Abstracts/CommandBase.ps1

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<#
.Description
    Base class for all command classes.
    Provides functionality to fire events/operations at command levels like command started,
    command completed and perform operation like generate run-identifier, invoke auto module update,
    open log folder at the end of commmand execution etc
#>

using namespace System.Management.Automation
Set-StrictMode -Version Latest

class CommandBase: AzSKRoot {

    #Region: Properties
    [string[]] $FilterTags = @();
    [bool] $DoNotOpenOutputFolder = $false;
    [bool] $Force = $false
    #EndRegion

    #Region: Constructor
    CommandBase([string] $subscriptionId, [InvocationInfo] $invocationContext):
    Base($subscriptionId) {

        [Helpers]::AbstractClass($this, [CommandBase]);
        
        if (-not $invocationContext) {
            throw [System.ArgumentException] ("The argument 'invocationContext' is null. Pass the `$PSCmdlet.MyInvocation from PowerShell command.");
        }
        
        $this.InvocationContext = $invocationContext;
        
        #Validate if privacy is accepted by user
        [PrivacyNotice]::ValidatePrivacyAcceptance()

        #Initialize common parameter sets
        if($null -ne $this.InvocationContext.BoundParameters["DoNotOpenOutputFolder"])
        {
            $this.DoNotOpenOutputFolder = $this.InvocationContext.BoundParameters["DoNotOpenOutputFolder"];
        }
        if($null -ne $this.InvocationContext.BoundParameters["Force"])
        {
            $this.Force = $this.InvocationContext.BoundParameters["Force"];
        }
    }
    #EndRegion

    #Region: Command level listerner events
    [void] CommandStarted() {
        $this.PublishAzSKRootEvent([AzSKRootEvent]::CommandStarted, $this.CheckModuleVersion());
    }
    
    [void] PostCommandStartedAction()
    {
        
    }

    [void] CommandError([System.Management.Automation.ErrorRecord] $exception) {
        [AzSKRootEventArgument] $arguments = $this.CreateRootEventArgumentObject();
        $arguments.ExceptionMessage = $exception;

        $this.PublishEvent([AzSKRootEvent]::CommandError, $arguments);
    }

    [void] CommandCompleted([MessageData[]] $messages) {
        $this.PublishAzSKRootEvent([AzSKRootEvent]::CommandCompleted, $messages);
    }
    
    [void] CommandProgress([int] $totalItems, [int] $currentItem) {
        $this.CommandProgress($totalItems, $currentItem, 1);
    }

    [void] CommandProgress([int] $totalItems, [int] $currentItem, [int] $granularity) {
        if ($totalItems -gt 0) {
            # $granularity indicates the number of items after which percentage progress will be printed
            # Set the max granularity to total items
            if ($granularity -gt $totalItems) {
                $granularity = $totalItems;
            }

            # Conditions for posting progress: 0%, 100% and based on granularity
            if ($currentItem -eq 0 -or $currentItem -eq $totalItems -or (($currentItem % $granularity) -eq 0)) {
                $this.PublishCustomMessage("$([int](($currentItem / $totalItems) * 100))% Completed");
            }
        }
    }

    # Dummy function declaration to define the function signature
    [void] PostCommandCompletedAction([MessageData[]] $messages)
    { }
    #EndRegion

    #Region: Helper function to invoke function based on method name.
    # This is method called from command(GRS/GSS etc) files and resposinble for printing command start/end messages using listeners
    [string] InvokeFunction([PSMethod] $methodToCall) {
        return $this.InvokeFunction($methodToCall, @());
    }

    [string] InvokeFunction([PSMethod] $methodToCall, [System.Object[]] $arguments) {
        if (-not $methodToCall) {
            throw [System.ArgumentException] ("The argument 'methodToCall' is null. Pass the reference of method to call. e.g.: [YourClass]::new().YourMethod");
        }

        # Reset cached context <TODO Framework: Fix Dependancy on RM module>
        [ContextHelper]::ResetCurrentRMContext()

        # Publish runidentifier(YYYYMMDD_HHMMSS) used by all listener as identifier for scan,creating log folder
        $this.PublishRunIdentifier($this.InvocationContext);
        
        # <TODO Framework: Move command time calculation methods to AIOrgTelmetry Listener>
        
        [AIOrgTelemetryHelper]::TrackCommandExecution("Command Started",
            @{"RunIdentifier" = $this.RunIdentifier}, @{}, $this.InvocationContext);
        $sw = [System.Diagnostics.Stopwatch]::StartNew();
        
        # Publish command init events
        $this.CommandStarted();
        $this.PostCommandStartedAction();

        # Invoke method with arguments
        $methodResult = @();
        try {
           $methodResult = $methodToCall.Invoke($arguments);
        }
        catch {
            # Unwrapping the first layer of exception which is added by Invoke function
            [AIOrgTelemetryHelper]::TrackCommandExecution("Command Errored",
                @{"RunIdentifier" = $this.RunIdentifier; "ErrorRecord"= $_.Exception.InnerException.ErrorRecord},
                @{"TimeTakenInMs" = $sw.ElapsedMilliseconds; "SuccessCount" = 0},
                $this.InvocationContext);
            $this.CommandError($_.Exception.InnerException.ErrorRecord);
        }

        # Publish command complete events
        $this.CommandCompleted($methodResult);
        [AIOrgTelemetryHelper]::TrackCommandExecution("Command Completed",
            @{"RunIdentifier" = $this.RunIdentifier},
            @{"TimeTakenInMs" = $sw.ElapsedMilliseconds; "SuccessCount" = 1},
            $this.InvocationContext)
        $this.PostCommandCompletedAction($methodResult);

        $folderPath = $this.GetOutputFolderPath();

        # <TODO Framework: Move PDF generation method based on listener>
        #Generate PDF report
        $GeneratePDFReport = $this.InvocationContext.BoundParameters["GeneratePDF"];
        try {
            if (-not [string]::IsNullOrEmpty($folderpath)) {
                switch ($GeneratePDFReport) {
                    None {
                        # Do nothing
                    }
                    Landscape {
                        [AzSKPDFExtension]::GeneratePDF($folderpath, $this.SubscriptionContext, $this.InvocationContext, $true);
                    }
                    Portrait {
                        [AzSKPDFExtension]::GeneratePDF($folderpath, $this.SubscriptionContext, $this.InvocationContext, $false);
                    }
                }
            }
        }
        catch {
            # Unwrapping the first layer of exception which is added by Invoke function
            $this.CommandError($_);
        }

        #
        $AttestControlParamFound = $this.InvocationContext.BoundParameters["AttestControls"];
        if($null -eq $AttestControlParamFound)
        {
            if((-not $this.DoNotOpenOutputFolder) -and (-not [string]::IsNullOrEmpty($folderPath)))
            {
                try
                {
                    Invoke-Item -Path $folderPath;
                }
                catch
                {
                    #ignore if any exception occurs
                }
            }
        }
        return $folderPath;
    }
    #EndRegion

    
    # Function to get output log folder from WriteFolder listener
    [string] GetOutputFolderPath() {
        return [WriteFolderPath]::GetInstance().FolderPath;
    }

    # <TODO Framework: Move to module helper class>
    # Function to validate module version based on Org policy and showcase warning for update or block commands if version is less than last two minor version
    [void] CheckModuleVersion() {
         
        $currentModuleVersion = [System.Version] $this.GetCurrentModuleVersion()
        $serverVersion = [System.Version] ([ConfigurationManager]::GetAzSKConfigData().GetLatestAzSKVersion($this.GetModuleName()));
        $currentModuleVersion = [System.Version] $this.GetCurrentModuleVersion() 
        if($currentModuleVersion -ne "0.0.0.0" -and $serverVersion -gt $this.GetCurrentModuleVersion()) {
            $this.RunningLatestPSModule = $false;
            $this.InvokeAutoUpdate()
            $this.PublishCustomMessage(([Constants]::VersionCheckMessage -f $serverVersion), [MessageType]::Warning);
            $this.PublishCustomMessage(([ConfigurationManager]::GetAzSKConfigData().InstallationCommand + "`r`n"), [MessageType]::Update);
            $this.PublishCustomMessage([Constants]::VersionWarningMessage, [MessageType]::Warning);

            $serverVersions = @()
            [ConfigurationManager]::GetAzSKConfigData().GetAzSKVersionList($this.GetModuleName()) | ForEach-Object { 
                #Take major and minor version and ignore build version for comparision
               $serverVersions+= [System.Version] ("$($_.Major)" +"." + "$($_.Minor)")
             }            
            $serverVersions =  $serverVersions | Select-Object -Unique
            $latestVersionList = $serverVersions | Where-Object {$_ -gt $currentModuleVersion}
            if(($latestVersionList | Measure-Object).Count -gt [ConfigurationManager]::GetAzSKConfigData().BackwardCompatibleVersionCount)
            {
                throw ([SuppressedException]::new(("Your version of AzSK is too old. Please update now!"),[SuppressedExceptionType]::Generic))
            }
        }
        
        $psGalleryVersion = [System.Version] ([ConfigurationManager]::GetAzSKConfigData().GetAzSKLatestPSGalleryVersion($this.GetModuleName()));            
        if($psGalleryVersion -ne $serverVersion)
        {
            $serverVersions = @()
            [ConfigurationManager]::GetAzSKConfigData().GetAzSKVersionList($this.GetModuleName()) | ForEach-Object { 
                #Take major and minor version and ignore build version for comparision
               $serverVersions+= [System.Version] ("$($_.Major)" +"." + "$($_.Minor)")
             }            
            $serverVersions =  $serverVersions | Select-Object -Unique
            $latestVersionAvailableFromGallery = $serverVersions | Where-Object {$_ -gt $serverVersion}
            if(($latestVersionAvailableFromGallery | Measure-Object).Count -gt [ConfigurationManager]::GetAzSKConfigData().BackwardCompatibleVersionCount)
            {
                $this.PublishCustomMessage("Your Org AzSK version [$serverVersion] is too old. It must be updated to latest available version [$psGalleryVersion].",[MessageType]::Error);
            }
        }
        
    }
    
    # <TODO Framework: Move to module helper class>
    # Funtion to execute module auto update flow based on switch
    [void] InvokeAutoUpdate()
    {
        $AutoUpdateSwitch= [ConfigurationManager]::GetAzSKSettings().AutoUpdateSwitch;
        $AutoUpdateCommand = [ConfigurationManager]::GetAzSKSettings().AutoUpdateCommand;

        if($AutoUpdateSwitch -ne [AutoUpdate]::On)
        {
            if($AutoUpdateSwitch -eq [AutoUpdate]::NotSet)
            {
                Write-Host "Auto-update for AzSK is currently not enabled for your machine. To set it, run the command below:" -ForegroundColor Yellow
                Write-Host "Set-AzSKPolicySettings -AutoUpdate On`n" -ForegroundColor Green
            }
            return;
        }

        #Step 1: Get the list of active running powershell prcesses including the current running PS Session
        $PSProcesses = Get-Process | Where-Object { ($_.Name -eq 'powershell' -or $_.Name -eq 'powershell_ise' -or $_.Name -eq 'powershelltoolsprocesshost')}

        $userChoice = ""
        if(($PSProcesses | Measure-Object).Count -ge 1)
        {            
            Write-Host "A new version of AzSK is available. Starting the auto-update workflow...`nTo prepare for auto-update, please:`n`t a) Save your work from all active PS sessions including the current one and`n`t b) Close all PS sessions other than the current one. " -ForegroundColor Cyan
        }

        #User choice that captures the decision to close the active PS Sessions
        $secondUserChoice =""
        $InvalidOption = $true;
        while($InvalidOption)
        {
            if([string]::IsNullOrWhiteSpace($userChoice) -or ($userChoice.Trim() -ne 'y' -and $userChoice.Trim() -ne 'n'))
            {
                $userChoice = Read-Host "Continue (Y/N)"
                if([string]::IsNullOrWhiteSpace($userChoice) -or ($userChoice.Trim() -ne 'y' -and $userChoice.Trim() -ne 'n'))
                {
                    Write-Host "Enter the valid option." -ForegroundColor Yellow
                }
                continue;
            }
            elseif($userChoice.Trim() -eq 'n')
            {
                $InvalidOption = $false;
            }
            elseif($userChoice.Trim() -eq 'y')
            {
                #Get the number of PS active sessions
                $PSProcesses = Get-Process | Where-Object { ($_.Name -eq 'powershell' -or $_.Name -eq 'powershell_ise' -or $_.Name -eq 'powershelltoolsprocesshost') -and $_.Id -ne $PID}
                if(($PSProcesses | Measure-Object).Count -gt 0)
                {
                    Write-Host "`nThe following other PS sessions are still active. Please save your work and close them. You can also use Task Manager to close these sessions." -ForegroundColor Yellow
                    Write-Host ($PSProcesses | Select-Object Id, ProcessName, Path | Out-String)
                    $secondUserChoice = Read-Host "Continue (Y/N)"
                }
                elseif(($PSProcesses | Measure-Object).Count -eq 0)
                {
                    Write-Host "`nThe current PS session will be closed now. Have you saved your work?" -ForegroundColor Yellow
                    $secondUserChoice = Read-Host "Continue (Y/N)"
                }
                if(-not [string]::IsNullOrWhiteSpace($secondUserChoice) -and `
                (($PSProcesses | Measure-Object).Count -eq 0 -and $secondUserChoice.Trim() -eq 'y') -or `
                $secondUserChoice.Trim() -eq 'n')
                {
                    $InvalidOption = $false;
                }
            }
        }
        #Check if the first user want to continue with auto-update using userChoice field and then check if user still wants to continue with auto-update after finding the active PS sessions.
        #In either case it is no it would exit the auto-update process
        if($userChoice.Trim() -eq "n" -or $secondUserChoice.Trim() -eq 'n')
        {            
            Write-Host "Exiting auto-update workflow. To disable auto-update permanently, run the command below:" -ForegroundColor Yellow
            Write-Host "Set-AzSKPolicySettings -AutoUpdate Off`n" -ForegroundColor Green
            return
        }
        $AzSKTemp = Join-Path $([Constants]::AzSKAppFolderPath) "Temp";
        try
        {
            $fileName = "au_" + $(get-date).ToUniversalTime().ToString("yyyyMMdd_HHmmss") + ".ps1";

            $autoUpdateContent = [ConfigurationHelper]::LoadOfflineConfigFile("ModuleAutoUpdate.ps1");
            if(-not (Test-Path -Path $AzSKTemp))
            {
                New-Item -Path $AzSKTemp -ItemType Directory -Force
            }
            Remove-Item -Path (Join-Path $AzSKTemp "au_*") -Force -Recurse -ErrorAction SilentlyContinue

            $autoUpdateContent = $autoUpdateContent.Replace("##installurl##",$AutoUpdateCommand);
            $autoUpdateContent | Out-File (Join-Path $AzSKTemp $fileName) -Force

            Start-Process -WindowStyle Normal -FilePath "powershell.exe" -ArgumentList (Join-Path $AzSKTemp $fileName)
        }
        catch
        {
            $this.CommandError($_.Exception.InnerException.ErrorRecord);
        }
    }
}