DSCResources/MSFT_AADMSGroup/MSFT_AADMSGroup.psm1

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

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

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

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

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

        [Parameter()]
        [ValidateSet('On', 'Paused')]
        [System.String]
        $MembershipRuleProcessingState,

        [Parameter()]
        [System.Boolean]
        $SecurityEnabled,

        [Parameter()]
        [System.Boolean]
        $MailEnabled,

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

        [Parameter()]
        [ValidateSet('Public', 'Private', 'HiddenMembership')]
        [System.String]
        $Visibility,

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

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

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

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

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

    Write-Verbose -Message "Getting configuration of AzureAD Group"
    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName.Replace("MSFT_", "")
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $ResourceName)
    $data.Add("Method", $MyInvocation.MyCommand)
    $data.Add("Principal", $GlobalAdminAccount.UserName)
    $data.Add("TenantId", $TenantId)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    $ConnectionMode = New-M365DSCConnection -Platform 'AzureAD' -InboundParameters $PSBoundParameters
    $nullReturn = $PSBoundParameters
    $nullReturn.Ensure = "Absent"
    try
    {
        if ($PSBoundParameters.ContainsKey("Id"))
        {
            Write-Verbose -Message "GroupID was specified"
            try
            {
                $Group = Get-AzureADMSGroup -id $Id -ErrorAction Stop
            }
            catch
            {
                $Group = Get-AzureADMSGroup -Filter "DisplayName eq '$DisplayName'" -ErrorAction Stop
                if ($Group.Length -gt 1)
                {
                    throw "Duplicate AzureAD Groups named $DisplayName exist in tenant"
                }
            }
        }
        else
        {
            Write-Verbose -Message "Id was NOT specified"
            ## Can retreive multiple AAD Groups since displayname is not unique
            $Group = Get-AzureADMSGroup -Filter "DisplayName eq '$DisplayName'" -ErrorAction Stop
            if ($Group.Length -gt 1)
            {
                throw "Duplicate AzureAD Groups named $DisplayName exist in tenant"
            }
        }

        if ($null -eq $Group)
        {
            return $nullReturn
        }
        else
        {
            Write-Verbose -Message "Found existing AzureAD Group"

            $result = @{
                DisplayName                   = $Group.DisplayName
                Id                            = $Group.Id
                Description                   = $Group.Description
                GroupTypes                    = [System.String[]]$Group.GroupTypes
                MembershipRule                = $Group.MembershipRule
                MembershipRuleProcessingState = $Group.MembershipRuleProcessingState
                SecurityEnabled               = $Group.SecurityEnabled
                MailEnabled                   = $Group.MailEnabled
                MailNickname                  = $Group.MailNickname
                Visibility                    = $Group.Visibility
                Ensure                        = "Present"
                GlobalAdminAccount            = $GlobalAdminAccount
                ApplicationId                 = $ApplicationId
                TenantId                      = $TenantId
                CertificateThumbprint         = $CertificateThumbprint
            }
            Write-Verbose -Message "Get-TargetResource Result: `n $(Convert-M365DscHashtableToString -Hashtable $result)"
            return $result
        }
    }
    catch
    {
        Write-Verbose -Message $_
        Add-M365DSCEvent -Message $_ -EntryType 'Error' `
            -EventID 1 -Source $($MyInvocation.MyCommand.Source)
        return $nullReturn
    }
}

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

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

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

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

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

        [Parameter()]
        [ValidateSet('On', 'Paused')]
        [System.String]
        $MembershipRuleProcessingState,

        [Parameter()]
        [System.Boolean]
        $SecurityEnabled,

        [Parameter()]
        [System.Boolean]
        $MailEnabled,

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

        [Parameter()]
        [ValidateSet('Public', 'Private', 'HiddenMembership')]
        [System.String]
        $Visibility,

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

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

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

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

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

    Write-Verbose -Message "Setting configuration of Azure AD Groups"
    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName.Replace("MSFT_", "")
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $ResourceName)
    $data.Add("Method", $MyInvocation.MyCommand)
    $data.Add("Principal", $GlobalAdminAccount.UserName)
    $data.Add("TenantId", $TenantId)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    $currentGroup = Get-TargetResource @PSBoundParameters
    $currentParameters = $PSBoundParameters
    $currentParameters.Remove("ApplicationId")
    $currentParameters.Remove("TenantId")
    $currentParameters.Remove("CertificateThumbprint")
    $currentParameters.Remove("GlobalAdminAccount")
    $currentParameters.Remove("Ensure")

    if ($Ensure -eq 'Present' -and $GroupTypes.Contains("Unified") -and $MailEnabled -eq $false)
    {
        Write-Verbose -Message "Cannot set mailenabled to false if GroupTypes is set to Unified when creating group."
        throw "Cannot set mailenabled to false if GroupTypes is set to Unified when creating a group."
    }

    if ($Ensure -eq 'Present' -and $currentGroup.Ensure -eq 'Present')
    {
        try
        {
            Set-AzureADMSGroup @currentParameters
        }
        catch
        {
            New-M365DSCLogEntry -Error $_ -Message "Couldn't set group $DisplayName" -Source $MyInvocation.MyCommand.ModuleName
        }
    }
    elseif ($Ensure -eq 'Present' -and $currentGroup.Ensure -eq 'Absent')
    {
        $currentParameters.Remove("Id")
        try
        {
            New-AzureADMSGroup @currentParameters
        }
        catch
        {
            New-M365DSCLogEntry -Error $_ -Message "Couldn't create group $DisplayName" -Source $MyInvocation.MyCommand.ModuleName
        }
    }
    elseif ($Ensure -eq 'Absent' -and $currentGroup.Ensure -eq 'Present')
    {
        try
        {
            Remove-AzureADMSGroup -Id $currentGroup.ID
        }
        catch
        {
            New-M365DSCLogEntry -Error $_ -Message "Couldn't delete group $DisplayName" -Source $MyInvocation.MyCommand.ModuleName
        }
    }
}

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

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

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

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

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

        [Parameter()]
        [ValidateSet('On', 'Paused')]
        [System.String]
        $MembershipRuleProcessingState,

        [Parameter()]
        [System.Boolean]
        $SecurityEnabled,

        [Parameter()]
        [System.Boolean]
        $MailEnabled,

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

        [Parameter()]
        [ValidateSet('Public', 'Private', 'HiddenMembership')]
        [System.String]
        $Visibility,

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

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

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

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

        [Parameter()]
        [System.String]
        $CertificateThumbprint
    )
    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName.Replace("MSFT_", "")
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $ResourceName)
    $data.Add("Method", $MyInvocation.MyCommand)
    $data.Add("Principal", $GlobalAdminAccount.UserName)
    $data.Add("TenantId", $TenantId)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    Write-Verbose -Message "Testing configuration of AzureAD Groups"

    $CurrentValues = Get-TargetResource @PSBoundParameters

    Write-Verbose -Message "Target Values: $(Convert-M365DscHashtableToString -Hashtable $PSBoundParameters)"

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

    $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]
        $GlobalAdminAccount,

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

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

        [Parameter()]
        [System.String]
        $CertificateThumbprint
    )
    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName.Replace("MSFT_", "")
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $ResourceName)
    $data.Add("Method", $MyInvocation.MyCommand)
    $data.Add("Principal", $GlobalAdminAccount.UserName)
    $data.Add("TenantId", $TenantId)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    $ConnectionMode = New-M365DSCConnection -Platform 'AzureAD' -InboundParameters $PSBoundParameters
    try
    {
        [array] $groups = Get-AzureADMSGroup -All:$true -ErrorAction Stop
        $i = 1
        $dscContent = ''
        Write-Host "`r`n" -NoNewLine
        foreach ($group in $groups)
        {
            Write-Host " |---[$i/$($groups.Count)] $($group.DisplayName)" -NoNewLine
            $Params = @{
                GlobalAdminAccount    = $GlobalAdminAccount
                DisplayName           = $group.DisplayName
                Id                    = $group.Id
                ApplicationId         = $ApplicationId
                TenantId              = $TenantId
                CertificateThumbprint = $CertificateThumbprint
            }
            $Results = Get-TargetResource @Params
            $Results = Update-M365DSCExportAuthenticationResults -ConnectionMode $ConnectionMode `
                -Results $Results
            $dscContent += Get-M365DSCExportContentForResource -ResourceName $ResourceName `
                -ConnectionMode $ConnectionMode `
                -ModulePath $PSScriptRoot `
                -Results $Results `
                -GlobalAdminAccount $GlobalAdminAccount
            Write-Host $Global:M365DSCEmojiGreenCheckMark
            $i++
        }
        return $dscContent
    }
    catch
    {
        Write-Verbose -Message $_
        Add-M365DSCEvent -Message $_ -EntryType 'Error' `
            -EventID 1 -Source $($MyInvocation.MyCommand.Source)
        return ""
    }
}

Export-ModuleMember -Function *-TargetResource