DSCResources/MSFT_EXOEOPProtectionPolicyRule/MSFT_EXOEOPProtectionPolicyRule.psm1

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

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

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

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

        [Parameter(Mandatory = $true)]
        [System.Object]
        $Identity,

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

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

        [Parameter()]
        [System.Int32]
        $Priority,

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

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

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

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

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $ApplicationSecret,

        [Parameter()]
        [System.String[]]
        $AccessTokens
    )

    New-M365DSCConnection -Workload 'ExchangeOnline' `
        -InboundParameters $PSBoundParameters | Out-Null

    #Ensure the proper dependencies are installed in the current environment.
    Confirm-M365DSCDependencies

    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName.Replace('MSFT_', '')
    $CommandName = $MyInvocation.MyCommand
    $data = Format-M365DSCTelemetryParameters -ResourceName $ResourceName `
        -CommandName $CommandName `
        -Parameters $PSBoundParameters
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    $nullResult = $PSBoundParameters
    $nullResult.Ensure = 'Absent'
    try
    {
        $instance = Get-EOPProtectionPolicyRule -Identity $Identity -ErrorAction SilentlyContinue
        if ($null -eq $instance)
        {
            return $nullResult
        }

        Write-Verbose -Message "Found an instance with Identity {$Identity}"
        $results = @{
            Comments                  = $instance.Comments
            ExceptIfRecipientDomainIs = $instance.ExceptIfRecipientDomainIs
            ExceptIfSentTo            = $instance.ExceptIfSentTo
            ExceptIfSentToMemberOf    = $instance.ExceptIfSentToMemberOf
            Identity                  = $instance.Identity
            State                     = $instance.State
            Name                      = $instance.Name
            Priority                  = $instance.Priority
            RecipientDomainIs         = $instance.RecipientDomainIs
            SentTo                    = $instance.SentTo
            SentToMemberOf            = $instance.SentToMemberOf
            Ensure                    = 'Present'
            Credential                = $Credential
            ApplicationId             = $ApplicationId
            TenantId                  = $TenantId
            CertificateThumbprint     = $CertificateThumbprint
            ApplicationSecret         = $ApplicationSecret
            AccessTokens              = $AccessTokens
        }
        return [System.Collections.Hashtable] $results
    }
    catch
    {
        New-M365DSCLogEntry -Message 'Error retrieving data:' `
            -Exception $_ `
            -Source $($MyInvocation.MyCommand.Source) `
            -TenantId $TenantId `
            -Credential $Credential

        return $nullResult
    }
}

function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [Parameter()]
        [System.String]
        $Comments,

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

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

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

        [Parameter(Mandatory = $true)]
        [System.Object]
        $Identity,

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

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

        [Parameter()]
        [System.Int32]
        $Priority,

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

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

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

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

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $ApplicationSecret,

        [Parameter()]
        [System.String[]]
        $AccessTokens
    )

    New-M365DSCConnection -Workload 'ExchangeOnline' `
        -InboundParameters $PSBoundParameters | Out-Null

    #Ensure the proper dependencies are installed in the current environment.
    Confirm-M365DSCDependencies

    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName.Replace('MSFT_', '')
    $CommandName = $MyInvocation.MyCommand
    $data = Format-M365DSCTelemetryParameters -ResourceName $ResourceName `
        -CommandName $CommandName `
        -Parameters $PSBoundParameters
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    $currentInstance = Get-TargetResource @PSBoundParameters

    $BoundParameters = Remove-M365DSCAuthenticationParameter -BoundParameters $PSBoundParameters

    if ($Ensure -eq 'Present' -and $currentInstance.Ensure -eq 'Absent')
    {
        #following Microsoft recommendation, we will not create new EOPProtectionPolicyRule, instead we will enable the rule if not already done
        Write-Verbose -Message 'We not create new EOPProtectionPolicyRule if it is not present'
    }
    elseif ($Ensure -eq 'Present' -and $currentInstance.Ensure -eq 'Present')
    {
        Write-Verbose -Message "Updating {$Identity}"

        $UpdateParameters = ([Hashtable]$BoundParameters).Clone()
        $UpdateParameters.Remove('State') | Out-Null

        $keys = $UpdateParameters.Keys
        foreach ($key in $keys)
        {
            if ($null -ne $UpdateParameters.$key -and $UpdateParameters.$key.GetType().Name -like '*cimInstance*')
            {
                $keyValue = Convert-M365DSCDRGComplexTypeToHashtable -ComplexObject $UpdateParameters.$key
                $UpdateParameters.Remove($key) | Out-Null
                $UpdateParameters.Add($keyName, $keyValue)
            }
        }

        if ($currentInstance.State -ne $State)
        {
            if ($State -eq 'Enabled')
            {
                Enable-EOPProtectionPolicyRule -Identity $Identity
            }
            else
            {
                Disable-EOPProtectionPolicyRule -Identity $Identity
            }
        }

        Set-EOPProtectionPolicyRule @UpdateParameters
    }
    elseif ($Ensure -eq 'Absent' -and $currentInstance.Ensure -eq 'Present')
    {
        #following Microsoft recommendation, we will not remove EOPProtectionPolicyRules.
        Write-Verbose -Message 'We will not remove EOPProtectionPolicyRules'
    }
}

function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [Parameter()]
        [System.String]
        $Comments,

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

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

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

        [Parameter(Mandatory = $true)]
        [System.Object]
        $Identity,

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

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

        [Parameter()]
        [System.Int32]
        $Priority,

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

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

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $Credential,

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

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $ApplicationSecret,

        [Parameter()]
        [System.String[]]
        $AccessTokens
    )

    #Ensure the proper dependencies are installed in the current environment.
    Confirm-M365DSCDependencies

    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName.Replace('MSFT_', '')
    $CommandName = $MyInvocation.MyCommand
    $data = Format-M365DSCTelemetryParameters -ResourceName $ResourceName `
        -CommandName $CommandName `
        -Parameters $PSBoundParameters
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    Write-Verbose -Message "Testing configuration of {$Identity}"

    $CurrentValues = Get-TargetResource @PSBoundParameters
    $ValuesToCheck = ([Hashtable]$PSBoundParameters).Clone()
    $ValuesToCheck.Remove('Identity') | Out-Null

    if ($CurrentValues.Ensure -eq 'Absent')
    {
        Write-Verbose -Message "Test-TargetResource returned $false"
        return $false
    }

    Write-Verbose -Message "Current Values: $(Convert-M365DscHashtableToString -Hashtable $CurrentValues)"
    Write-Verbose -Message "Target Values: $(Convert-M365DscHashtableToString -Hashtable $ValuesToCheck)"

    foreach ($key in $ValuesToCheck.Keys)
    {
        # Convert any DateTime to String
        if (($null -ne $CurrentValues[$key]) `
                -and ($CurrentValues[$key].GetType().Name -eq 'DateTime'))
        {
            $CurrentValues[$key] = $CurrentValues[$key].toString()
            continue
        }

        if ($null -eq $CurrentValues[$key])
        {
            switch -regex ($key)
            {
                '^ExceptIf\w+$|^RecipientDomainIs$|^SentTo(\w+)?$'
                {
                    $CurrentValues[$key] = @()
                    break
                }
            }
        }
    }

    $testResult = Test-M365DSCParameterState -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()]
        [System.Management.Automation.PSCredential]
        $Credential,

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $ApplicationSecret,

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

        [Parameter()]
        [Switch]
        $ManagedIdentity,

        [Parameter()]
        [System.String[]]
        $AccessTokens
    )

    $ConnectionMode = New-M365DSCConnection -Workload 'ExchangeOnline' `
        -InboundParameters $PSBoundParameters

    #Ensure the proper dependencies are installed in the current environment.
    Confirm-M365DSCDependencies

    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName.Replace('MSFT_', '')
    $CommandName = $MyInvocation.MyCommand
    $data = Format-M365DSCTelemetryParameters -ResourceName $ResourceName `
        -CommandName $CommandName `
        -Parameters $PSBoundParameters
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    try
    {
        [array]$getValue = Get-EOPProtectionPolicyRule -ErrorAction Stop

        $i = 1
        $dscContent = ''
        if ($getValue.Length -eq 0)
        {
            Write-Host $Global:M365DSCEmojiGreenCheckMark
        }
        else
        {
            Write-Host "`r`n" -NoNewline
        }
        foreach ($config in $getValue)
        {
            if ($null -ne $Global:M365DSCExportResourceInstancesCount)
            {
                $Global:M365DSCExportResourceInstancesCount++
            }

            $displayedKey = $config.Identity
            if (-not [String]::IsNullOrEmpty($config.displayName))
            {
                $displayedKey = $config.displayName
            }
            Write-Host " |---[$i/$($getValue.Count)] $displayedKey" -NoNewline
            $params = @{
                Identity              = $config.Identity
                Ensure                = 'Present'
                Credential            = $Credential
                ApplicationId         = $ApplicationId
                TenantId              = $TenantId
                CertificateThumbprint = $CertificateThumbprint
                ApplicationSecret     = $ApplicationSecret
                AccessTokens          = $AccessTokens
            }

            $Results = Get-TargetResource @Params
            $Results = Update-M365DSCExportAuthenticationResults -ConnectionMode $ConnectionMode `
                -Results $Results

            $currentDSCBlock = Get-M365DSCExportContentForResource -ResourceName $ResourceName `
                -ConnectionMode $ConnectionMode `
                -ModulePath $PSScriptRoot `
                -Results $Results `
                -Credential $Credential
            $dscContent += $currentDSCBlock
            Save-M365DSCPartialExport -Content $currentDSCBlock `
                -FileName $Global:PartialExportFileName
            $i++
            Write-Host $Global:M365DSCEmojiGreenCheckMark
        }
        return $dscContent
    }
    catch
    {
        Write-Host $Global:M365DSCEmojiRedX

        New-M365DSCLogEntry -Message 'Error during Export:' `
            -Exception $_ `
            -Source $($MyInvocation.MyCommand.Source) `
            -TenantId $TenantId `
            -Credential $Credential

        return ''
    }
}

Export-ModuleMember -Function *-TargetResource