DSCResources/MSFT_SCCaseHoldRule/MSFT_SCCaseHoldRule.psm1

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

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

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

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

        [Parameter()]
        [System.Boolean]
        $Disabled = $false,

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

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

    Write-Verbose -Message "Getting configuration of SCCaseHoldRule 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

    $Rules = Get-CaseHoldRule -Policy $Policy -ErrorAction 'SilentlyContinue'
    $Rule = $Rules | Where-Object { $_.Name -eq $Name }

    if ($null -eq $Rule)
    {
        Write-Verbose -Message "SCCaseHoldRule $($Name) does not exist."
        $result = $PSBoundParameters
        $result.Ensure = 'Absent'
        return $result
    }
    else
    {
        Write-Verbose "Found existing SCCaseHoldRule $($Name)"

        $result = @{
            Name               = $Rule.Name
            Policy             = $Policy
            Comment            = $Rule.Comment
            Disabled           = $Rule.Disabled
            ContentMatchQuery  = $Rule.ContentMatchQuery
            GlobalAdminAccount = $GlobalAdminAccount
            Ensure             = 'Present'
        }

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

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

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

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

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

        [Parameter()]
        [System.Boolean]
        $Disabled = $false,

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

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

    Write-Verbose -Message "Setting configuration of SCCaseHoldRule 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")

        Write-Verbose "Creating new Case Hold Rule $Name calling the New-CaseHoldRule cmdlet."
        New-CaseHoldRule @CreationParams
    }
    # Compliance Case exists and it should. Update it.
    elseif (('Present' -eq $Ensure) -and ('Present' -eq $CurrentRule.Ensure))
    {
        $UpdateParams = @{
            Identity          = $Name
            Comment           = $Comment
            Disabled          = $Disabled
            ContentMatchQuery = $ContentMatchQuery
        }
        Write-Verbose "Updating Case Hold Rule $Name by calling the Set-CaseHoldRule cmdlet."
        Set-CaseHoldRule @UpdateParams
    }
    # Compliance Case exists but it shouldn't. Remove it.
    elseif (('Absent' -eq $Ensure) -and ('Present' -eq $CurrentTag.Ensure))
    {
        Remove-CaseHoldRule -Identity $Name -Confirm:$false
    }
}

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

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

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

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

        [Parameter()]
        [System.Boolean]
        $Disabled = $false,

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

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

    Write-Verbose -Message "Testing configuration of SCCaseHoldRule 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
    )

    $InformationPreference = "Continue"
    #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 $GlobalAdminAccount `
        -Platform SecurityComplianceCenter
    [array]$Rules = Get-CaseHoldRule

    $dscContent = ""
    $i = 1
    foreach ($Rule in $Rules)
    {
        Write-Information " - [$i/$($Rules.Count)] $($Rule.Name)"
        try
        {
            $policy = Get-CaseHoldPolicy -Identity $Rule.Policy -ErrorAction Stop

            $params = @{
                Name               = $Rule.Name
                Policy             = $policy.Name
                GlobalAdminAccount = $GlobalAdminAccount
            }
            $result = Get-TargetResource @params
            $result.GlobalAdminAccount = Resolve-Credentials -UserName "globaladmin"
            $dscContent += " SCCaseHoldRule " + (New-GUID).ToString() + "`r`n"
            $dscContent += " {`r`n"
            $currentDSCBlock = Get-DSCBlock -Params $result -ModulePath $PSScriptRoot
            $partialContent = Convert-DSCStringParamToVariable -DSCBlock $currentDSCBlock -ParameterName "GlobalAdminAccount"
            $partialContent += " }`r`n"
            $dscContent += $partialContent
        }
        catch
        {
            Write-Information "You are not authorized to access Case Hold Policy {$($Rule.Policy)}"
        }
        $i++
    }
    return $dscContent
}

Export-ModuleMember -Function *-TargetResource