AzSK.ADO

1.15.0

Framework/Core/STMapping/ServiceMappingCacheHelper.ps1

                                Set-StrictMode -Version Latest

class ServiceMappingCacheHelper {

    hidden static [ServiceMappingCacheHelper] $ServiceMappingCacheHelperInstance;

    hidden [bool] $UseAzureStorageAccount;

    hidden [string] $OrganizationName;

    # Resource Caching Storage settings to cache mappings

    hidden [string] $CacheStorageName;# Storage account name for Caching 

    hidden [string] $CacheStorageRG;# Storage resource group name for Caching 

    hidden [string] $CacheTable;#Storage table to cache resource mapping

    hidden [object] $CacheStorageAccountCtx;

    hidden [string] $SharedKey

    hidden [object] $hmacsha 

    ServiceMappingCacheHelper([string] $orgName) {

        $this.OrganizationName = $orgName;

        # Resources Caching Storage settings

        $this.CacheStorageName = $env:CacheStorageName;

        $this.CacheStorageRG = $env:CacheStorageRG;

        $this.CacheTable = $env:CacheTable;         

        #get storage details       

        if ($this.CacheStorageRG -and $this.CacheStorageName) {

            $keys = Get-AzStorageAccountKey -ResourceGroupName $this.CacheStorageRG -Name $this.CacheStorageName

            if ($null -ne $keys)

            {             

               #storage context to cache resource mappings

               $CacheStorageContext = New-AzStorageContext -StorageAccountName $this.CacheStorageName -StorageAccountKey $keys[0].Value -Protocol Https                                

               $this.CacheStorageAccountCtx = $CacheStorageContext.Context; 

               $this.SharedKey = $keys[0].Value;

               $this.hmacsha = New-Object System.Security.Cryptography.HMACSHA256

               $this.hmacsha.key = [Convert]::FromBase64String($this.SharedKey) 

            }

        }

    }

    #Return ServiceMappingCacheHelper instance

    hidden static [ServiceMappingCacheHelper] GetInstance([string] $orgName) {

        [ServiceMappingCacheHelper]::ServiceMappingCacheHelperInstance = [ServiceMappingCacheHelper]::new($orgName)

        return [ServiceMappingCacheHelper]::ServiceMappingCacheHelperInstance

    }

    #function to search for existing mapping based on hash id

    hidden [object] GetWorkItemByHashAzureTable([string] $resourceType, [string] $pipelineType, [string] $pipelineId,[string] $resourceId, [string] $projectID) 

    {    

        #get storage table data.

        $azTableMappingInfo = @();   

        try {            

            $azTableMappingInfo += $this.GetTableEntity($projectID,$pipelineId,$pipelineType, $resourceId,$resourceType); 

            if ($azTableMappingInfo -and $azTableMappingInfo.count -gt 0) {                            

                return $azTableMappingInfo;

            }

        }

        catch {

            Write-Host $_

            Write-Host "Could not access storage account." -ForegroundColor Red

        }  

        return $azTableMappingInfo;

    }

    hidden [bool] InsertMappingInfoInTable( [string]  $orgName, [string]  $projectID, [string]  $pipelineID, [string]  $serviceTreeID,[string]  $pipelineLastModified,[string]  $resourceID,[string]  $resourceType,[string]  $resourceName,[string]  $pipelineType,[string]  $mappingExpiration) 

    {

        try 

        {                   

           #Get table filterd by name.

           $storageTables = @();

           $storageTables += Get-AzStorageTable -Context $this.CacheStorageAccountCtx | Select Name;

           #create table if table not found.

           if ( !$storageTables -or ($storageTables.count -eq 0) -or !($storageTables.Name -eq $this.CacheTable) ) {

               New-AzStorageTable $this.CacheTable -Context $this.CacheStorageAccountCtx;

           }

           $isDataAddedInTable = $this.AddDataInTable($orgName,$projectID,$pipelineID,$serviceTreeID,$pipelineLastModified,$resourceID,$resourceType,$resourceName,$pipelineType, $mappingExpiration)

           return $isDataAddedInTable;           

        }

        catch {

            return $false;

        } 

        return $false

    }

    hidden [string] GenerateSearchQuery($projectID,$pipelineId,$pipelineType, $resourceId,$resourceType,$hash)

    {

        $query = 'PartitionKey eq ''{0}''' -f $hash;

        if($resourceType -eq "All")

        {

           return 'OrgName eq ''{0}'' and ProjectID eq ''{1}''' -f $this.OrganizationName, $projectID; 

        }

        if($resourceType -eq "VariableGroup" -or $resourceType -eq "SecureFile" -and ![string]::IsNullOrEmpty($resourceId)) 

        {

            return 'RowKey eq ''{0}''' -f $hash;

        }

        if($resourceType -eq "VariableGroup" -or $resourceType -eq "SecureFile" -and [string]::IsNullOrEmpty($resourceId)) 

        {

            return 'OrgName eq ''{0}'' and PipelineType eq ''{1}''' -f $this.OrganizationName, $pipelineType;

        }

        return $query;

    }

    hidden [object] GetTableEntity($projectID,$pipelineId,$pipelineType, $resourceId,$resourceType) {

        try 

        {

            $hash = $this.GetHashedTag($projectID, $pipelineID, $pipelineType,$resourceID,$resourceType)            

            $query =$this.GenerateSearchQuery($projectID,$pipelineId,$pipelineType, $resourceId,$resourceType,$hash)                         

            $resource = '$filter='+[System.Web.HttpUtility]::UrlEncode($query);

            $table_url = "https://{0}.table.core.windows.net/{1}?{2}" -f $this.CacheStorageName, $this.CacheTable, $resource

            $headers = $this.GetHeader($this.CacheTable)

            $item = Invoke-RestMethod -Method Get -Uri $table_url -Headers $headers -ContentType "application/json"

            return $item.value;

        }

        catch

        {

            #Write-Host $_

            Write-Host "Could not fetch the entry for partition key from table storage or the table was not found.";

            return $null

        }

    }

    hidden [bool] AddDataInTable([string]  $orgName, [string]  $projectID, [string]  $pipelineID, [string]  $serviceTreeID,[string]  $pipelineLastModified,[string]  $resourceID,[string]  $resourceType,[string]  $resourceName,[string]  $pipelineType,[string]  $mappingExpiration) 

    {        

        $partitionKey = $this.GetHashedTag($projectID, $pipelineID, $pipelineType,"","");

        $rowKey = $this.GetHashedTag($projectID, $pipelineID, $pipelineType,$resourceID,$resourceType)

        try 

        {

            #Add data in table.            

            $entity = @{"PartitionKey" = $partitionKey; "RowKey" = $rowKey; "OrgName" = $orgName; "ProjectID" = $projectID; "PipelineID" = $pipelineID;"ServiceTreeID" = $serviceTreeID;"PipelineLastModified" = $pipelineLastModified;"ResourceID" = $resourceID;"ResourceType" = $resourceType;"ResourceName" = $resourceName;"PipelineType" = $pipelineType;  "MappingExpiration" = $MappingExpiration};

            $table_url = "https://{0}.table.core.windows.net/{1}" -f $this.CacheStorageName, $this.CacheTable

            $headers = $this.GetHeader($this.CacheTable);

            $body = $entity | ConvertTo-Json

            $item = Invoke-RestMethod -Method POST -Uri $table_url -Headers $headers -Body $body -ContentType "application/json"

            return $true;

        }

        catch

        {

            Write-Host $_

            Write-Host "Could not push an entry in the table for row key [$rowKey]";

            return $false;

        }

    }

    hidden [bool] UpdateTableEntity([string]  $orgName, [string]  $projectID, [string]  $pipelineID, [string]  $serviceTreeID,[string]  $pipelineLastModified,[string]  $resourceID,[string]  $resourceType,[string]  $resourceName,[string]  $pipelineType,[string]  $mappingExpiration) 

    {

        $partitionKey = $this.GetHashedTag($projectID, $pipelineID, $pipelineType,"","");

        $rowKey = $this.GetHashedTag($projectID, $pipelineID, $pipelineType,$resourceID,$resourceType)

        try {

            #Update data in table.

            $tableName = $this.CacheTable;

            $entity = @{"OrgName" = $orgName; "ProjectID" = $projectID; "PipelineID" = $pipelineID;"ServiceTreeID" = $serviceTreeID;"PipelineLastModified" = $pipelineLastModified;"ResourceID" = $resourceID;"ResourceType" = $resourceType;"ResourceName" = $resourceName;"PipelineType" = $pipelineType;  "MappingExpiration" = $MappingExpiration};

            $body = $entity | ConvertTo-Json

            $version = "2017-04-17"

            $resource = "$tableName(PartitionKey='$PartitionKey',RowKey='$Rowkey')"

            $table_url = "https://$($this.CacheStorageName).table.core.windows.net/$resource"

            $GMTTime = (Get-Date).ToUniversalTime().toString('R')

            $stringToSign = "$GMTTime`n/$($this.CacheStorageName)/$resource"

            $signature = $this.hmacsha.ComputeHash([Text.Encoding]::UTF8.GetBytes($stringToSign))

            $signature = [Convert]::ToBase64String($signature)

            $body = $entity | ConvertTo-Json

            $headers = @{

                'x-ms-date'      = $GMTTime

                Authorization    = "SharedKeyLite " + $this.CacheStorageName + ":" + $signature

                "x-ms-version"   = $version

                Accept           = "application/json;odata=minimalmetadata"

                'If-Match'       = "*"

            }

            Invoke-RestMethod -Method PUT -Uri $table_url -Headers $headers -Body $body -ContentType "application/json;odata=minimalmetadata"

            return $true;

        }

        catch

        {

            Write-Host $_

            Write-Host "Could not update entry in the table for row key [$RowKey]";

            return $false;

        }

    }

    hidden [object] GetHeader($tableName)

    {

        $version = "2017-07-29"

        $GMTTime = (Get-Date).ToUniversalTime().toString('R')

        $stringToSign = "$GMTTime`n/$($this.CacheStorageName)/$tableName"

        $signature = $this.hmacsha.ComputeHash([Text.Encoding]::UTF8.GetBytes($stringToSign))

        $signature = [Convert]::ToBase64String($signature)

        $headers = @{

            'x-ms-date'    = $GMTTime

            Authorization  = "SharedKeyLite " + $this.CacheStorageName + ":" + $signature

            "x-ms-version" = $version

            Accept         = "application/json;odata=minimalmetadata"

        }

        return $headers

    }

    #function to compute hash and return the tag

    hidden [string] GetHashedTag([string] $projectID, [string] $pipelineID, [string] $pipelineType,[string] $resourceID,[string] $resourceType) { 

        $stringToHash = "$projectID#$pipelineID#$pipelineType";  

        if(![string]::IsNullOrEmpty($resourceType))

        {    

            $stringToHash = "$projectID#$pipelineID##$pipelineType$resourceID#$resourceType";

        }   

        return $this.ComputeHashX($stringToHash);     

    }

    hidden [string] ComputeHashX([string] $dataToHash) {

        return [Helpers]::ComputeHashShort($dataToHash, [Constants]::AutoBugLogTagLen)

    }

}

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