DSCResources/MSFT_SCSupervisoryReviewRule/MSFT_SCSupervisoryReviewRule.psm1

function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [Parameter(Mandatory = $true)]
        [ValidateLength(1, 64)]
        [System.String]
        $Name,

        [Parameter(Mandatory = $true)]
        [System.String]
        $Policy,

        [Parameter()]
        [System.String]
        $Condition,

        [Parameter()]
        [ValidateRange(0, 100)]
        [System.UInt32]
        $SamplingRate,

        [Parameter()]
        [ValidateSet('Present', 'Absent')]
        [System.String]
        $Ensure = 'Present',

        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $GlobalAdminAccount
    )

    Write-Verbose -Message "Getting configuration of SupervisoryReviewRule for $Name"
    #region Telemetry
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $MyInvocation.MyCommand.ModuleName)
    $data.Add("Method", $MyInvocation.MyCommand)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    Test-MSCloudLogin -CloudCredential $GlobalAdminAccount `
        -Platform SecurityComplianceCenter

    $RuleObjects = Get-SupervisoryReviewRule
    $RuleObject = $RuleObjects | Where-Object { $_.Name -eq $Name }

    if ($null -eq $RuleObject)
    {
        Write-Verbose -Message "SupervisoryReviewRule $($Name) does not exist."
        $result = $PSBoundParameters
        $result.Ensure = 'Absent'
        return $result
    }
    else
    {
        Write-Verbose "Found existing SupervisoryReviewRule $($Name)"
        $PolicyName = (Get-SupervisoryReviewPolicyV2 -Identity $RuleObject.Policy).Name

        $result = @{
            Name               = $RuleObject.Name
            Policy             = $PolicyName
            Condition          = $RuleObject.Condition
            SamplingRate       = $RuleObject.SamplingRate
            Ensure             = 'Present'
            GlobalAdminAccount = $GlobalAdminAccount
        }

        Write-Verbose -Message "Found SupervisoryReviewRule $($Name)"
        Write-Verbose -Message "Get-TargetResource Result: `n $(Convert-M365DscHashtableToString -Hashtable $result)"
        return $result
    }
}

function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory = $true)]
        [ValidateLength(1, 64)]
        [System.String]
        $Name,

        [Parameter(Mandatory = $true)]
        [System.String]
        $Policy,

        [Parameter()]
        [System.String]
        $Condition,

        [Parameter()]
        [ValidateRange(0, 100)]
        [System.UInt32]
        $SamplingRate,

        [Parameter()]
        [ValidateSet('Present', 'Absent')]
        [System.String]
        $Ensure = 'Present',

        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $GlobalAdminAccount
    )

    Write-Verbose -Message "Setting configuration of SupervisoryReviewRule for $Name"
    #region Telemetry
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $MyInvocation.MyCommand.ModuleName)
    $data.Add("Method", $MyInvocation.MyCommand)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    Test-MSCloudLogin -CloudCredential $GlobalAdminAccount `
        -Platform SecurityComplianceCenter

    $CurrentRule = Get-TargetResource @PSBoundParameters

    if (('Present' -eq $Ensure) -and ('Absent' -eq $CurrentRule.Ensure))
    {
        $CreationParams = $PSBoundParameters
        $CreationParams.Remove("GlobalAdminAccount")
        $CreationParams.Remove("Ensure")
        New-SupervisoryReviewRule @CreationParams
    }
    elseif (('Present' -eq $Ensure) -and ('Present' -eq $CurrentRule.Ensure))
    {
        Set-SupervisoryReviewRule -Identity $CurrentRule.Name `
            -Condition $CurrentRule.Condition `
            -SamplingRate $CurrentRule.SamplingRate
    }
    elseif ('Absent' -eq $Ensure)
    {
        throw "The SCSupervisoryReviewRule resource doesn't not support deleting Rules. " + `
            "Instead try removing the associated policy, or modifying the existing rule."
    }
}

function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [Parameter(Mandatory = $true)]
        [ValidateLength(1, 64)]
        [System.String]
        $Name,

        [Parameter(Mandatory = $true)]
        [System.String]
        $Policy,

        [Parameter()]
        [System.String]
        $Condition,

        [Parameter()]
        [ValidateRange(0, 100)]
        [System.UInt32]
        $SamplingRate,

        [Parameter()]
        [ValidateSet('Present', 'Absent')]
        [System.String]
        $Ensure = 'Present',

        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $GlobalAdminAccount
    )

    Write-Verbose -Message "Testing configuration of SupervisoryReviewRule for $Name"

    $CurrentValues = Get-TargetResource @PSBoundParameters
    Write-Verbose -Message "Target Values: $(Convert-M365DscHashtableToString -Hashtable $PSBoundParameters)"

    $ValuesToCheck = $PSBoundParameters
    $ValuesToCheck.Remove('GlobalAdminAccount') | Out-Null

    $TestResult = Test-Microsoft365DSCParameterState -CurrentValues $CurrentValues `
        -Source $($MyInvocation.MyCommand.Source) `
        -DesiredValues $PSBoundParameters `
        -ValuesToCheck $ValuesToCheck.Keys

    Write-Verbose -Message "Test-TargetResource returned $TestResult"

    return $TestResult
}

function Export-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.String])]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $GlobalAdminAccount
    )
    #region Telemetry
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $MyInvocation.MyCommand.ModuleName)
    $data.Add("Method", $MyInvocation.MyCommand)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    Test-MSCloudLogin -CloudCredential $GlobalAdminAccount `
        -Platform SecurityComplianceCenter `
        -ErrorAction SilentlyContinue

    $rules = Get-SupervisoryReviewRule
    $organization = ""
    $principal = "" # Principal represents the "NetBios" name of the tenant (e.g. the M365DSC part of M365DSC.onmicrosoft.com)
    if ($GlobalAdminAccount.UserName.Contains("@"))
    {
        $organization = $GlobalAdminAccount.UserName.Split("@")[1]

        if ($organization.IndexOf(".") -gt 0)
        {
            $principal = $organization.Split(".")[0]
        }
    }

    $totalRules = $rules.Length
    if ($null -eq $totalRules)
    {
        $totalRules = 1
    }
    $i = 1
    $content = ''
    foreach ($rule in $rules)
    {
        Write-Information " [$i/$totalRules] $($rule.Name)"
        $params = @{
            GlobalAdminAccount = $GlobalAdminAccount
            Name               = $rule.Name
            Policy             = $rule.Policy
        }
        $result = Get-TargetResource @params
        $result.GlobalAdminAccount = Resolve-Credentials -UserName "globaladmin"
        $content += " SCSupervisoryReviewRule " + (New-GUID).ToString() + "`r`n"
        $content += " {`r`n"
        $partialContent = Get-DSCBlock -Params $result -ModulePath $PSScriptRoot
        $partialContent = Convert-DSCStringParamToVariable -DSCBlock $partialContent -ParameterName "GlobalAdminAccount"
        if ($partialContent.ToLower().Contains($organization.ToLower()) -or `
                $partialContent.ToLower().Contains($principal.ToLower()))
        {
            $partialContent = $partialContent -ireplace [regex]::Escape("@" + $organization), "@`$(`$OrganizationName)"
        }
        $content += $partialContent
        $content += " }`r`n"
        $i++
    }
    return $content
}

Export-ModuleMember -Function *-TargetResource