AzSKPreview

4.0.0

Framework/Helpers/ResourceHelper.ps1

using namespace Microsoft.Azure.Storage.Blob
using namespace Microsoft.Azure.Commands.Management.Storage.Models
using namespace Microsoft.WindowsAzure.Commands.Common.Storage.ResourceModel
Set-StrictMode -Version Latest
class ResourceGroupHelper: EventBase
{
    [string] $ResourceGroupName;
    [string] $ResourceGroupLocation = "EastUS2";

    [PSObject] $ResourceGroup;

    ResourceGroupHelper([string] $subscriptionId, [string] $resourceGroupName):
        Base($subscriptionId)
    {
        $this.CreateInstance($resourceGroupName, "EastUS2");
    }

    ResourceGroupHelper([string] $subscriptionId, [string] $resourceGroupName, [string] $resourceGroupLocation):
        Base($subscriptionId)
    {
        $this.CreateInstance($resourceGroupName, $resourceGroupLocation);
    }

    hidden [void] CreateInstance([string] $resourceGroupName, [string] $resourceGroupLocation)
    {
        if([string]::IsNullOrWhiteSpace($resourceGroupName))
        {
            throw [System.ArgumentException] ("The argument 'resourceGroupName' is null or empty");
        }
        $this.ResourceGroupName = $resourceGroupName;
        if(-not [string]::IsNullOrWhiteSpace($resourceGroupLocation))
        {
            $this.ResourceGroupLocation = $resourceGroupLocation;
        }
    }

    [void] CreateResourceGroupIfNotExists()
    {
        if(-not $this.ResourceGroup)
        {
            $rg = Get-AzResourceGroup -Name $this.ResourceGroupName -ErrorAction ignore
            #$rg = Get-AzResourceGroup | Where-Object { $_.ResourceGroupName -eq $this.ResourceGroupName } | Select-Object -First 1
            if(-not $rg)
            {
                $this.PublishCustomMessage("Creating resource group [$($this.ResourceGroupName)]...");
                $result = [ResourceGroupHelper]::NewAzSKResourceGroup($this.ResourceGroupName, $this.ResourceGroupLocation, "");
                if($result)
                {
                    $this.ResourceGroup = $result;
                    $this.PublishCustomMessage("Successfully created resource group [$($this.ResourceGroupName)]", [MessageType]::Update);
                }
                else
                {
                    throw ([SuppressedException]::new("Error occured while creating resource group [$($this.ResourceGroupName)]", [SuppressedExceptionType]::Generic))                
                }
            }
            else
            {
                $this.ResourceGroup = $rg;
            }
        }
    }

    static [PSObject] GetResourceGroupTags([string]$RGName)
    {
        $azskResourceGroup = Get-AzResourceGroup -Name $RGName -ErrorAction SilentlyContinue;
        $tags = @{}
        if(($azskResourceGroup | Measure-Object).Count -gt 0)
        {
            $tags = $azskResourceGroup.Tags;
            if($null -eq $tags)
            {
                $tags = @{}
            }
        }
        return $tags 
    }

    static [string] GetResourceGroupTag([string]$RGName, [string] $tagName)
    {
        $azskResourceGroup = Get-AzResourceGroup -Name $RGName -ErrorAction SilentlyContinue;
        $tags = @{}
        if(($azskResourceGroup | Measure-Object).Count -gt 0)
        {
            $tags = $azskResourceGroup.Tags;
            if(($tags | Measure-Object).Count -gt 0)
            {
                return $tags[$tagName];
            }
        }
        return ""; 
    }

    static [bool] NewAzSKResourceGroup([string]$ResourceGroup, [string]$Location, [string] $Version) {
        try {
            [Hashtable] $RGTags = @{};
            if ([string]::IsNullOrWhiteSpace($Version))
             {
               $version= [Constants]::AzSKCurrentModuleVersion
            }
                $RGTags += @{
                    "AzSKVersion" = $Version;
                    "CreationTime" = $(get-date).ToUniversalTime().ToString("yyyyMMdd_HHmmss");
                }
            
            $newRG = New-AzResourceGroup -Name $ResourceGroup -Location $Location `
                -Tag $RGTags `
                -ErrorAction Stop

            return $true
        }
        catch {
            #return as false in the case of exception. Caller of this function is taking care if the value is false
            return $false
        }

    }
    
    static [void] CreateNewResourceGroupIfNotExists([string]$ResourceGroup, [string]$Location, [string] $Version) 
    {
       if((Get-AzResourceGroup -Name $ResourceGroup -ErrorAction SilentlyContinue | Measure-Object).Count -eq 0)
        {
            [ResourceGroupHelper]::NewAzSKResourceGroup($ResourceGroup,$Location,$Version)
        }  
    }
    
    static [void] SetResourceGroupTags([string]$RGName, [PSObject]$TagsHashTable, [bool] $Remove) {
        [ResourceGroupHelper]::SetResourceGroupTags($RGName, $TagsHashTable, $Remove, $true) 
    }

    static [void] SetResourceGroupTags([string]$RGName, [PSObject]$TagsHashTable, [bool] $Remove, [bool] $update) {
        $azskResourceGroup = Get-AzResourceGroup -Name $RGName -ErrorAction SilentlyContinue;
        if(($azskResourceGroup | Measure-Object).Count -gt 0)
        {
            $tags = $azskResourceGroup.Tags;
            if($null -eq $tags)
            {
                $tags = @{}
            }
            if(($TagsHashTable | Measure-Object).Count -gt 0)
            {
                $TagsHashTable.Keys | ForEach-Object {
                    $key = $_;
                    if($null -ne $tags -and $tags.ContainsKey($key))
                    {
                        if($update)
                        {
                            $tags[$key] = $TagsHashTable[$key];
                        }
                        if($Remove)
                        {
                            $tags.Remove($key);
                        }
                    }
                    elseif(-not $Remove)
                    {
                        $tags.Add($key, $TagsHashTable[$key])
                    }
                }
            }
            try
            {
                Set-AzResourceGroup -Name $RGName -Tag $tags -ErrorAction Stop
            }
            catch
            {
                #Skipping tag exception. Exception can be raised due to privilege issues.
                #[EventBase]::PublishGenericCustomMessage(" `r`nError occured while adding tag(s) on resource group [$RGName]. $($_.Exception)", [MessageType]::Warning);
            }
        }
    }

    static [bool] IsLatestVersionConfiguredOnSub([String] $ConfigVersion,[string] $TagName,[string] $FeatureName)
    {
        $IsLatestVersionPresent = [ResourceGroupHelper]::IsLatestVersionConfiguredOnSub($ConfigVersion,$TagName)
        if($IsLatestVersionPresent){
            #<TODO Framework: Use Publish Custom Message and use only one function for latest configurations versions>
            Write-Host "$FeatureName configuration in your subscription is already up to date. If you would like to reconfigure, please rerun the command with '-Force' parameter." -ForegroundColor Cyan
        }                
        return $IsLatestVersionPresent        
    }

    static [bool] IsLatestVersionConfiguredOnSub([String] $ConfigVersion,[string] $TagName)
    {
        $IsLatestVersionPresent = $false
        $tagsOnSub =  [ResourceGroupHelper]::GetResourceGroupTags([ConfigurationManager]::GetAzSKConfigData().AzSKRGName) 
        if($tagsOnSub)
        {
            $SubConfigVersion= $tagsOnSub.GetEnumerator() | Where-Object {$_.Name -eq $TagName -and $_.Value -eq $ConfigVersion}
            
            if(($SubConfigVersion | Measure-Object).Count -gt 0)
            {
                $IsLatestVersionPresent = $true                
            }            
        }
        return $IsLatestVersionPresent        
    }

}

class ResourceHelper: EventBase{

    static [void] SetResourceTags([string] $ResourceId, [PSObject] $TagsHashTable, [bool] $Remove, [bool] $update) {
        $azskResource = Get-AzResource -ResourceId $ResourceId -ErrorAction SilentlyContinue;
        if(($azskResource | Measure-Object).Count -gt 0)
        {
            $tags = $azskResource.Tags;
            if($null -eq $tags)
            {
                $tags = @{}
            }
            if(($TagsHashTable | Measure-Object).Count -gt 0)
            {
                $TagsHashTable.Keys | ForEach-Object {
                    $key = $_;
                    if($null -ne $tags -and $tags.ContainsKey($key))
                    {
                        if($update)
                        {
                            $tags[$key] = $TagsHashTable[$key];
                        }
                        if($Remove)
                        {
                            $tags.Remove($key);
                        }
                    }
                    elseif(-not $Remove)
                    {
                        $tags.Add($key, $TagsHashTable[$key])
                    }
                }
            }            
            try
            {
                Set-AzResource -ResourceId $ResourceId -Tag $tags -Force -ErrorAction Stop
            }
            catch
            {
                [EventBase]::PublishGenericCustomMessage(" `r`nError occured while adding tag(s) on resource [$ResourceId]. $($_.Exception)", [MessageType]::Warning);
            }
        }
    }
    
    static [bool] IsvNetExpressRouteConnected($resourceName, $resourceGroupName)
    {
        $result = $false;
        $gateways = @();
        $gateways += Get-AzVirtualNetworkGateway -ResourceGroupName $resourceGroupName | Where-Object { $_.GatewayType -eq "ExpressRoute" }
        if($gateways.Count -ne 0)
        {
            $vNet = Get-AzVirtualNetwork -Name $resourceName -ResourceGroupName $resourceGroupName 
            if($vnet)
            {
                $subnetIds = @();
                $vnet | ForEach-Object {
                    if($_.Subnets)
                    {
                        $subnetIds += $_.Subnets | Select-Object -Property Id | Select-Object -ExpandProperty Id
                    }
                };
            
                if($subnetIds.Count -ne 0)
                {
                    $gateways | ForEach-Object {
                        $result = $result -or (($_.IpConfigurations | Where-Object { $subnetIds -contains $_.Subnet.Id } | Measure-Object).Count -ne 0);
                    };
                }
            }
        }
        return $result; 
    }

    static [void] RegisterResourceProviderIfNotRegistered([string] $provideNamespace)
    {
        if([string]::IsNullOrWhiteSpace($provideNamespace))
        {
            throw [System.ArgumentException] "The argument '$provideNamespace' is null or empty";
        }

        # Check if provider is registered or not
        if(-not [ResourceHelper]::IsProviderRegistered($provideNamespace))
        {
            [EventBase]::PublishGenericCustomMessage(" `r`nThe resource provider: [$provideNamespace] is not registered on the subscription. `r`nRegistering resource provider, this can take up to a minute...", [MessageType]::Warning);

            Register-AzResourceProvider -ProviderNamespace $provideNamespace

            $retryCount = 10;
            while($retryCount -ne 0 -and (-not [ResourceHelper]::IsProviderRegistered($provideNamespace)))
            {
                $timeout = 10
                Start-Sleep -Seconds $timeout
                $retryCount--;
                #[EventBase]::PublishGenericCustomMessage("Checking resource provider status every $timeout seconds...");
            }

            if(-not [ResourceHelper]::IsProviderRegistered($provideNamespace))
            {
                throw ([SuppressedException]::new(("Resource provider: [$provideNamespace] registration failed. `r`nTry registering the resource provider from Azure Portal --> your Subscription --> Resource Providers --> $provideNamespace --> Register"), [SuppressedExceptionType]::Generic))
            }
            else
            {
                [EventBase]::PublishGenericCustomMessage("Resource provider: [$provideNamespace] registration successful.`r`n ", [MessageType]::Update);
            }
        }
    }

    hidden static [bool] IsProviderRegistered([string] $provideNamespace)
    {
        return ((Get-AzResourceProvider -ProviderNamespace $provideNamespace | Where-Object { $_.RegistrationState -ne "Registered" } | Measure-Object).Count -eq 0);
    }

}


class StorageHelper: ResourceGroupHelper
{
    hidden [PSStorageAccount] $StorageAccount = $null;
    [string] $StorageAccountName;
    [string] $StorageKind; 
    [string] $AccessKey;
    [int] $HaveWritePermissions = 0;
    [int] $retryCount = 3;
    [int] $sleepIntervalInSecs = 10;
    static [StorageHelper] $AzSKStorageHelperInstance = $null
    hidden [string] $ResourceType = "Microsoft.Storage/storageAccounts";

    StorageHelper([string] $subscriptionId, [string] $resourceGroupName, [string] $resourceGroupLocation, [string] $storageAccountName):
        Base($subscriptionId, $resourceGroupName, $resourceGroupLocation)
    {
        if([string]::IsNullOrWhiteSpace($storageAccountName))
        {
            throw [System.ArgumentException] ("The argument 'storageAccountName' is null or empty");
        }
        $this.StorageAccountName = $storageAccountName;
        $this.StorageKind = [Constants]::NewStorageKind;
    }
    StorageHelper([string] $subscriptionId, [string] $resourceGroupName, [string] $resourceGroupLocation, [string] $storageAccountName, [string] $storageKind):
        Base($subscriptionId, $resourceGroupName, $resourceGroupLocation)
    {
        if([string]::IsNullOrWhiteSpace($storageAccountName))
        {
            throw [System.ArgumentException] ("The argument 'storageAccountName' is null or empty");
        }
        $this.StorageAccountName = $storageAccountName;
        $this.StorageKind = $storageKind
    }
    [void] UpdateCurrentInstance([StorageHelper] $AzSKStorageHelperInstance)
    {
        $this.AccessKey = $AzSKStorageHelperInstance.AccessKey
        $this.HaveWritePermissions = $AzSKStorageHelperInstance.HaveWritePermissions
    }

    static [void] UploadStorageBlobContent([string] $fileName, [string] $blobName, [string] $containerName, [object] $stgCtx)
    {
            Set-AzStorageBlobContent -Blob $blobName -Container $containerName -File $fileName -Context $stgCtx -Force | Out-Null
    }

    static [object] GetStorageBlobContent([string] $folderName, [string] $fileName, [string] $blobName, [string] $containerName, [object] $stgCtx)
    {
             $fileName = $folderName.TrimEnd("\")+ "\" + $fileName
             return [StorageHelper]::GetStorageBlobContent($fileName, $blobName, $containerName, $stgCtx)
    }

    static [object] GetStorageBlobContent([string] $fileName, [string] $blobName, [string] $containerName, [object] $stgCtx)
    {
        $result = Get-AzStorageBlobContent -Blob $blobName -Container $containerName -Destination $fileName -Context $stgCtx -Force 
        return $result
    }


    [void] CreateStorageIfNotExists()
    {
        if(-not $this.StorageAccount)
        {
            $isAzSKStorage = $false;
            $this.CreateResourceGroupIfNotExists();
            if($this.ResourceGroupName -eq [ConfigurationManager]::GetAzSKConfigData().AzSKRGName -and $this.StorageAccountName -like "$([Constants]::StorageAccountPreName)*")           
            {
                if($null -ne [StorageHelper]::AzSKStorageHelperInstance)
                {
                    $this.UpdateCurrentInstance([StorageHelper]::AzSKStorageHelperInstance);
                    return;
                }
                else {
                    $isAzSKStorage = $true
                }               
            }   
            $existingResources = Get-AzResource -ResourceGroupName $this.ResourceGroupName -ResourceType $this.ResourceType
            
            # Assuming 1 storage account is needed on Resource group
            if(($existingResources | Measure-Object).Count -gt 1)
            {
                throw ([SuppressedException]::new(("Multiple storage accounts found in resource group: [$($this.ResourceGroupName)]. This is not expected. Please contact support team."), [SuppressedExceptionType]::InvalidOperation))
            }
            elseif(($existingResources | Measure-Object).Count -eq 0)
            {
                $this.PublishCustomMessage("Creating a storage account: ["+ $this.StorageAccountName +"]...");
                $newStorage = [StorageHelper]::NewAzskCompliantStorage($this.StorageAccountName, $this.StorageKind, $this.ResourceGroupName, $this.ResourceGroupLocation);
                if($newStorage)
                {
                    $this.PublishCustomMessage("Successfully created storage account [$($this.StorageAccountName)]", [MessageType]::Update);
                }
                else
                {
                    throw ([SuppressedException]::new("Failed to create storage account [$($this.StorageAccountName)]", [SuppressedExceptionType]::Generic))
                }
            }
            elseif(($existingResources | Measure-Object).Count -eq 1)
            {
                $this.StorageAccountName = $existingResources.Name;
            }

            # Fetch the Storage account context
            $this.StorageAccount = Get-AzStorageAccount -ResourceGroupName $this.ResourceGroupName -Name $this.StorageAccountName -ErrorAction Ignore
            if(-not ($this.StorageAccount -and $this.StorageAccount.Context))
            {
                $this.StorageAccount = $null;
                throw ([SuppressedException]::new("Unable to fetch the storage account [$($this.StorageAccountName)]", [SuppressedExceptionType]::InvalidOperation))                
            }

            #fetch access key
            $keys = Get-AzStorageAccountKey -ResourceGroupName $this.ResourceGroupName -Name $this.StorageAccountName -ErrorAction SilentlyContinue 
            if($keys)
            {
                $this.AccessKey = $keys[0].Value;
            }    
            
            #precompute storage access permissions for the current scan account
            $this.ComputePermissions();
            if($isAzSKStorage)
            {
                [StorageHelper]::AzSKStorageHelperInstance = $this
            }
        }
    }

    [AzureStorageContainer] CreateStorageContainerIfNotExists([string] $containerName)
    {
        return $this.CreateStorageContainerIfNotExists($containerName, [BlobContainerPublicAccessType]::Off);
    }
    
    [AzureStorageContainer] CreateStorageContainerIfNotExists([string] $containerName, [BlobContainerPublicAccessType] $accessType)
    {
        if([string]::IsNullOrWhiteSpace($containerName))
        {
            throw [System.ArgumentException] ("The argument 'containerName' is null or empty");
        }

        $this.CreateStorageIfNotExists();

        $container = Get-AzStorageContainer -Context $this.StorageAccount.Context -Name $containerName -ErrorAction Ignore
        if(($container| Measure-Object).Count -eq 0)
        {
            $this.PublishCustomMessage("Creating storage container [$containerName]...");
            $container = New-AzStorageContainer -Context $this.StorageAccount.Context -Name $containerName -Permission $accessType
            if($container)
            {
                $this.PublishCustomMessage("Successfully created storage container [$containerName]", [MessageType]::Update);
            }
        }

        if(($container| Measure-Object).Count -eq 0)
        {
            throw ([SuppressedException]::new("Unable to fetch/create the container [$containerName] under storage account [$($this.StorageAccountName)]", [SuppressedExceptionType]::InvalidOperation))                
        }

        return $container;
    }

    [AzureStorageTable] CreateTableIfNotExists([string] $tableName)
    {
        if([string]::IsNullOrWhiteSpace($tableName))
        {
            throw [System.ArgumentException] ("The argument 'tableName' is null or empty");
        }

        $this.CreateStorageIfNotExists();

        $table = Get-AzStorageTable -Context $this.StorageAccount.Context -Name $tableName -ErrorAction Ignore
        if(($table| Measure-Object).Count -eq 0)
        {
            $this.PublishCustomMessage("Creating table [$tableName]...");
            $table = New-AzStorageTable -Name $tableName -Context $this.StorageAccount.Context 
            if($table)
            {
                $this.PublishCustomMessage("Successfully created table: [$tableName] in storage: [$($this.StorageAccountName)]", [MessageType]::Update);
            }
        }

        if(($table| Measure-Object).Count -eq 0)
        {
            throw ([SuppressedException]::new("Unable to fetch/create the table [$tableName] under storage account [$($this.StorageAccountName)]", [SuppressedExceptionType]::InvalidOperation))                
        }

        return $table;
    }

    hidden [void] ComputePermissions()
    {        
        if($null -eq $this.StorageAccount)
        {
            #No storage account => no permissions at all
            $this.HaveWritePermissions = 0
            return;
        }
        
        $this.HaveWritePermissions = 0
        #this is local constant with dummy container name to check for storage permissions
        $writeTestContainerName = "wt" + $(get-date).ToUniversalTime().ToString("yyyyMMddHHmmss");

        #see if user can create the test container in the storage account. If yes then user have both RW permissions.
        try
        {
            
            New-AzStorageContainer -Context $this.StorageAccount.Context -Name $writeTestContainerName -ErrorAction Stop
            $this.HaveWritePermissions = 1
            Remove-AzStorageContainer -Name $writeTestContainerName -Context  $this.StorageAccount.Context -ErrorAction SilentlyContinue -Force
        }
        catch
        {
            $this.HaveWritePermissions = 0
        }
    }


    [AzureStorageContainer] UploadFilesToBlob([string] $containerName, [string] $blobPath, [System.IO.FileInfo[]] $filesToUpload, [bool] $overwrite)
    {
        return $this.UploadFilesToBlob([string] $containerName, [BlobContainerPublicAccessType]::Off, $blobPath, $filesToUpload, $overwrite);
    }

    [AzureStorageContainer] UploadFilesToBlob([string] $containerName, [string] $blobPath, [System.IO.FileInfo[]] $filesToUpload)
    {
        return $this.UploadFilesToBlob([string] $containerName, [BlobContainerPublicAccessType]::Off, $blobPath, $filesToUpload);
    }

    [AzureStorageContainer] UploadFilesToBlob([string] $containerName, [BlobContainerPublicAccessType] $accessType, [string] $blobPath, [System.IO.FileInfo[]] $filesToUpload)
    {
        return $this.UploadFilesToBlob([string] $containerName, $accessType, $blobPath, $filesToUpload, $true);
    }

    [AzureStorageContainer] UploadFilesToBlob([string] $containerName, [BlobContainerPublicAccessType] $accessType, [string] $blobPath, [System.IO.FileInfo[]] $filesToUpload, [bool] $overwrite)
    {
        $result = $null;
        if($filesToUpload -and $filesToUpload.Count -ne 0)
        {
            $result = $this.CreateStorageContainerIfNotExists($containerName, $accessType);

            $this.PublishCustomMessage("Uploading [$($filesToUpload.Count)] file(s) to container [$containerName]...");
            $filesToUpload |
            ForEach-Object {
                $blobName = $_.Name;
                if(-not [string]::IsNullOrWhiteSpace($blobPath))
                {
                    $blobName = $blobPath + "/" + $blobName;
                }
                if($_.Extension.ToLower() -ne '.zip')
                {
                    [Helpers]::RemoveUtf8BOM($_);
                }

                $loopValue = $this.retryCount;
                $sleepValue = $this.sleepIntervalInSecs;
                while($loopValue -gt 0)
                {
                    $loopValue = $loopValue - 1;
                    try {
                        if($overwrite)
                        {
                             [StorageHelper]::UploadStorageBlobContent($_.FullName, $blobName , $containerName ,$this.StorageAccount.Context)
                             #Set-AzStorageBlobContent -Blob $blobName -Container $containerName -File $_.FullName -Context $this.StorageAccount.Context -Force | Out-Null
                        }
                        else
                        {
                            $currentBlob = Get-AzStorageBlob -Blob $blobName -Container $containerName -Context $this.StorageAccount.Context -ErrorAction Ignore
                        
                            if(-not $currentBlob)
                            {
                                [StorageHelper]::UploadStorageBlobContent($_.FullName, $blobName, $containerName, $this.StorageAccount.Context)
                                #Set-AzStorageBlobContent -Blob $blobName -Container $containerName -File $_.FullName -Context $this.StorageAccount.Context | Out-Null
                            }
                        }
                        $loopValue = 0;
                    }
                    catch {
                        #sleep for incremental 10 seconds before next retry;
                        Start-Sleep -Seconds $sleepValue;
                        $sleepValue = $sleepValue + 10;
                    }
                }

            };
            $this.PublishCustomMessage("All files have been uploaded to container [$containerName]");
        }
        else
        {
            throw [System.ArgumentException] ("The argument 'filesToUpload' is null or empty");
        }
        return $result;
    }

    [void] DownloadFilesFromBlob([string] $containerName, [string] $blobName, [string] $destinationPath, [bool] $overwrite)
    {
        $loopValue = $this.retryCount;
        $sleepValue = $this.sleepIntervalInSecs;
        while($loopValue -gt 0)
        {
            $loopValue = $loopValue - 1;
            try {
                if($overwrite)
                {
                    [StorageHelper]::GetStorageBlobContent($destinationPath, $blobName , $containerName ,$this.StorageAccount.Context)
                    #Get-AzStorageBlobContent -Blob $blobName -Container $containerName -Context $this.StorageAccount.Context -Destination $destinationPath -Force -ErrorAction Stop
                }
                else {
                    [StorageHelper]::GetStorageBlobContent($destinationPath, $blobName , $containerName ,$this.StorageAccount.Context)
                    #Get-AzStorageBlobContent -Blob $blobName -Container $containerName -Context $this.StorageAccount.Context -Destination $destinationPath -ErrorAction Stop
                }
                $loopValue = 0;
            }
            catch {
                #sleep for incremental 10 seconds before next retry;
                Start-Sleep -Seconds $sleepValue;
                $sleepValue = $sleepValue + 10;
            }
        }
    }

    [psobject] DownloadFilesFromBlob([string] $containerName, [string] $blobName, [string] $destinationPath, [bool] $overwrite,[bool] $WithoutVirtualDirectory)
    {
        $loopValue = $this.retryCount;
        $sleepValue = $this.sleepIntervalInSecs;
        $blobDetails =$null
        if($WithoutVirtualDirectory)
        {
            $copyDestinationPath = Join-Path $([Constants]::AzSKTempFolderPath) "ContainerContent"
            [Helpers]::CreateFolderIfNotExist($copyDestinationPath,$true)
        }
        else
        {
            $copyDestinationPath= $destinationPath
        }

        while($loopValue -gt 0)
        {
            $loopValue = $loopValue - 1;
            try {
                if($overwrite)
                {
                    [StorageHelper]::GetStorageBlobContent($copyDestinationPath, $blobName , $containerName ,$this.StorageAccount.Context)
                    #$blobDetails= Get-AzStorageBlobContent -Blob $blobName -Container $containerName -Context $this.StorageAccount.Context -Destination $copyDestinationPath -Force -ErrorAction Stop
                }
                else {
                    [StorageHelper]::GetStorageBlobContent($copyDestinationPath, $blobName , $containerName ,$this.StorageAccount.Context)
                    #$blobDetails= Get-AzStorageBlobContent -Blob $blobName -Container $containerName -Context $this.StorageAccount.Context -Destination $copyDestinationPath -ErrorAction Stop
                }
                $loopValue = 0;
            }
            catch {
                #sleep for incremental 10 seconds before next retry;
                Start-Sleep -Seconds $sleepValue;
                $sleepValue = $sleepValue + 10;
            }
        }
        if($WithoutVirtualDirectory)
        {
            Get-ChildItem -Path $copyDestinationPath -Recurse -File | Copy-Item -Destination $destinationPath -Force
        }
        return $blobDetails
    }

    [string] GenerateSASToken([string] $containerName)
    {
        $this.CreateStorageContainerIfNotExists($containerName);
        $sasToken = New-AzStorageContainerSASToken -Name $containerName -Context $this.StorageAccount.Context -ExpiryTime (Get-Date).AddMonths(6) -Permission rl -Protocol HttpsOnly -StartTime (Get-Date).AddDays(-1)
        if([string]::IsNullOrWhiteSpace($sasToken))
        {
            throw ([SuppressedException]::new("Unable to create SAS token for storage account [$($this.StorageAccountName)]", [SuppressedExceptionType]::InvalidOperation))
        }
        return $sasToken;
    }
    [string] GenerateTableSASToken([string] $tableName)
    {
        $this.CreateTableIfNotExists($tableName);
        $sasToken = New-AzStorageTableSASToken -Context $this.StorageAccount.Context -Name $tableName -Permission rau -Protocol HttpsOnly -StartTime (Get-Date).AddDays(-1) -ExpiryTime (Get-Date).AddHours(6) 
        if([string]::IsNullOrWhiteSpace($sasToken))
        {
            throw ([SuppressedException]::new("Unable to create SAS token for table [$tableName] in storage account [$($this.StorageAccountName)]", [SuppressedExceptionType]::InvalidOperation))
        }
        return $sasToken;
    }

    [void] GetStorageAccountInstance()
    {
        # Fetch the Storage account context
        $this.StorageAccount = Get-AzStorageAccount -ResourceGroupName $this.ResourceGroupName -Name $this.StorageAccountName -ErrorAction Ignore
        if(-not ($this.StorageAccount -and $this.StorageAccount.Context))
        {
            $this.StorageAccount = $null;
            throw ([SuppressedException]::new("Unable to fetch the storage account [$($this.StorageAccountName)] under resource group [$($this.ResourceGroupName)]", [SuppressedExceptionType]::InvalidOperation))                
        }
    }

    #Function to download files from container with or without virtual directory
    [PSObject] DownloadFilesFromContainer([string] $containerName, [string] $folderName, [string] $destinationPath, [bool] $overwrite, [bool] $WithoutVirtualDirectory)
    {
        $loopValue = $this.retryCount;
        $sleepValue = $this.sleepIntervalInSecs;
        $blobList = @()
        [Helpers]::CreateFolderIfNotExist($destinationPath,$false)
        if($WithoutVirtualDirectory)
        {
            $copyDestinationPath = Join-Path $([Constants]::AzSKTempFolderPath) "ContainerContent"
            [Helpers]::CreateFolderIfNotExist($copyDestinationPath,$true)
        }
        else
        {
            $copyDestinationPath= $destinationPath

        }
        while($loopValue -gt 0)
        {
            $loopValue = $loopValue - 1;
            try {
                $blobs = Get-AzStorageBlob -Container $containerName -Context $($this.StorageAccount.Context) | Where-Object {$_.Name -like "*$folderName*"}                 
                foreach ($blob in $blobs)
                {
                    $blobName = $blob.Name
                    $blobList+= [StorageHelper]::GetStorageBlobContent($copyDestinationPath, $blobName.Split("/")[-1], $blobName , $containerName ,$this.StorageAccount.Context)
                }
                $loopValue = 0;
            }
            catch {
                #sleep for incremental 10 seconds before next retry;
                Start-Sleep -Seconds $sleepValue;
                $sleepValue = $sleepValue + 10;
            }
        }
        if($WithoutVirtualDirectory)
        {
            Get-ChildItem -Path $copyDestinationPath -Recurse -File | Copy-Item -Destination $destinationPath -Force
        }
        return $blobList
    }
    
    static [PSObject] NewAzskCompliantStorage([string]$StorageName, [string]$StorageKind,[string]$ResourceGroup,[string]$Location) {
        $storageSku = [Constants]::NewStorageSku
        $storageObject = $null
        try {
            #register resource providers
            [ResourceHelper]::RegisterResourceProviderIfNotRegistered("Microsoft.Storage");
            [ResourceHelper]::RegisterResourceProviderIfNotRegistered("microsoft.insights");

            #create storage
            $status = Get-AzStorageAccountNameAvailability -Name $StorageName
            if($null -ne $status -and  $status.NameAvailable -eq $true)
            {
                $newStorage = New-AzStorageAccount -ResourceGroupName $ResourceGroup `
                    -Name $StorageName `
                    -Type $storageSku `
                    -Location $Location `
                    -Kind $StorageKind `
                    -AccessTier Cool `
                    -EnableHttpsTrafficOnly $true `
                    -ErrorAction Stop

                $retryAccount = 0
                do {
                    $storageObject = Get-AzStorageAccount -ResourceGroupName $ResourceGroup -Name $StorageName -ErrorAction SilentlyContinue
                    Start-Sleep -seconds 2
                    $retryAccount++
                }while (!$storageObject -and $retryAccount -ne 6)

                if ($storageObject) {                                       

                    #set diagnostics on
                    $currentContext = $storageObject.Context
                    Set-AzStorageServiceLoggingProperty -ServiceType Blob -LoggingOperations All -Context $currentContext -RetentionDays 365 -PassThru -ErrorAction Stop
                    Set-AzStorageServiceMetricsProperty -MetricsType Hour -ServiceType Blob -Context $currentContext -MetricsLevel ServiceAndApi -RetentionDays 365 -PassThru -ErrorAction Stop
                }
            }
            else
            {
                throw ([SuppressedException]::new(("The specified name for the storage account is not available. Please rerun this command to try a different name."), [SuppressedExceptionType]::Generic));          
            }
        }
        catch {
            [EventBase]::PublishGenericException($_);
            $storageObject = $null
            #clean-up storage if error occurs
            if ((Get-AzResource -ResourceGroupName $ResourceGroup -Name $StorageName|Measure-Object).Count -gt 0) {
            # caused deletion of storage on any exception.
                # Remove-AzureRmStorageAccount -ResourceGroupName $ResourceGroup -Name $StorageName -Force -ErrorAction SilentlyContinue
                
            }
        }
        return $storageObject
    }
    
    static [PSObject] NewAzskCompliantStorage([string]$StorageName, [string]$ResourceGroup, [string]$Location) {
        return [StorageHelper]::NewAzskCompliantStorage($StorageName,[Constants]::NewStorageKind,[string]$ResourceGroup,[string]$Location)
      }

    static [string] CreateStorageAccountSharedKey([string] $StringToSign,[string] $AccountName,[string] $AccessKey)
    {
        $KeyBytes = [System.Convert]::FromBase64String($AccessKey)
        $HMAC = New-Object System.Security.Cryptography.HMACSHA256
        $HMAC.Key = $KeyBytes
        $UnsignedBytes = [System.Text.Encoding]::UTF8.GetBytes($StringToSign)
        $KeyHash = $HMAC.ComputeHash($UnsignedBytes)
        $SignedString = [System.Convert]::ToBase64String($KeyHash)
        $sharedKey = $AccountName+":"+$SignedString
        return $sharedKey        
    }
}

class AppInsightHelper: ResourceGroupHelper
{
    [PSObject] $AppInsightInstance = $null;
    [string] $AppInsightName;
    [string] $AppInsightLocation;

    hidden [string] $ResourceType = "Microsoft.Insights/components";

    AppInsightHelper([string] $subscriptionId, [string] $resourceGroupName,[string] $resourceGroupLocation, [string] $appInsightsLocation, [string] $appInsightName):
        Base($subscriptionId, $resourceGroupName, $resourceGroupLocation)
    {
        if([string]::IsNullOrWhiteSpace($appInsightName))
        {
            throw [System.ArgumentException] ("The argument 'appInsightName' is null or empty");
        }
        $this.AppInsightName = $appInsightName;
        $this.AppInsightLocation = $appInsightsLocation;
    }

    [void] CreateAppInsightIfNotExists()
    {
        if(-not $this.AppInsightInstance)
        {
            $this.CreateResourceGroupIfNotExists();
            [ResourceHelper]::RegisterResourceProviderIfNotRegistered("microsoft.insights");
            $existingResources = Get-AzResource -ResourceGroupName $this.ResourceGroupName -ResourceType $this.ResourceType

            # Assuming 1 storage account is needed on Resource group
            if(($existingResources | Measure-Object).Count -gt 1)
            {
                throw ([SuppressedException]::new(("Multiple application insight resources found in resource group: [$($this.ResourceGroupName)]. This is not expected. Please contact support team."), [SuppressedExceptionType]::InvalidOperation))
            }
            elseif(($existingResources | Measure-Object).Count -eq 0)
            {
                $this.PublishCustomMessage("Creating an application insight resource ["+ $this.AppInsightName +"]...");
                $newResource = New-AzResource -ResourceName $this.AppInsightName -ResourceGroupName $this.ResourceGroupName -ResourceType $this.ResourceType `
                                    -Location $this.AppInsightLocation -PropertyObject @{"Application_Type"="web"} -Force
                if($newResource)
                {
                    $this.PublishCustomMessage("Successfully created application insight resource [$($this.AppInsightName)]", [MessageType]::Update);
                }
                else
                {
                    throw ([SuppressedException]::new("Failed to create application insight resource [$($this.AppInsightName)]", [SuppressedExceptionType]::Generic))
                }
            }
            elseif(($existingResources | Measure-Object).Count -eq 1)
            {
                $this.AppInsightName = $existingResources.Name;
            }

            # Fetch the application insight
            $this.AppInsightInstance = Get-AzResource -Name $this.AppInsightName -ResourceGroupName $this.ResourceGroupName -ResourceType $this.ResourceType -ExpandProperties 
            if(-not ($this.AppInsightInstance -and $this.AppInsightInstance.Properties))
            {
                $this.AppInsightInstance = $null;
                throw ([SuppressedException]::new("Unable to fetch application insight resource [$($this.AppInsightName)]", [SuppressedExceptionType]::InvalidOperation))                
            }
        }
    }
}