DSCResources/MSFT_xExchClientAccessServer/MSFT_xExchClientAccessServer.psm1

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function Get-TargetResource
{
    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSDSCUseVerboseMessageInDSCResource", "")]
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $Identity,

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

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

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

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

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

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

        [Parameter()]
        [System.Boolean]
        $RemoveAlternateServiceAccountCredentials
    )

    LogFunctionEntry -Parameters @{"Identity" = $Identity} -Verbose:$VerbosePreference

    #Establish remote Powershell session
    GetRemoteExchangeSession -Credential $Credential -CommandsToLoad "Get-ClientAccessServ*" -Verbose:$VerbosePreference

    $cas = GetClientAccessServer @PSBoundParameters

    if ($null -ne $cas)
    {
        if ($null -ne $cas.AutoDiscoverSiteScope)
        {
            $sites = $cas.AutoDiscoverSiteScope.ToArray()
        }
        else
        {
            $sites = @()
        }

        $returnValue = @{
            Identity                                         = [System.String] $Identity
            AutoDiscoverServiceInternalUri                   = [System.String] $cas.AutoDiscoverServiceInternalUri
            AutoDiscoverSiteScope                            = [System.String[]] $sites
            CleanUpInvalidAlternateServiceAccountCredentials = [System.Boolean] $CleanUpInvalidAlternateServiceAccountCredentials
            DomainController                                 = [System.String] $DomainController
            RemoveAlternateServiceAccountCredentials         = [System.Boolean] $RemoveAlternateServiceAccountCredentials
        }

        if ($cas.AlternateServiceAccountConfiguration.EffectiveCredentials.Count -gt 0)
        {
            $returnValue.Add("AlternateServiceAccountCredential", [System.Management.Automation.PSCredential] $cas.AlternateServiceAccountConfiguration.EffectiveCredentials.Credential)
        }
    }

    $returnValue
}


function Set-TargetResource
{
    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSDSCUseVerboseMessageInDSCResource", "")]
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $Identity,

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

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

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

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

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

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

        [Parameter()]
        [System.Boolean]
        $RemoveAlternateServiceAccountCredentials
    )

    #check for ambiguous parameter
    if (($AlternateServiceAccountCredential -and $RemoveAlternateServiceAccountCredentials) -or ($CleanUpInvalidAlternateServiceAccountCredentials -and $RemoveAlternateServiceAccountCredentials))
    {
        throw "Ambiguous parameter detected! Don't combine AlternateServiceAccountCredential with RemoveAlternateServiceAccountCredentials or CleanUpInvalidAlternateServiceAccountCredentials with RemoveAlternateServiceAccountCredentials!"
    }
    if ($AlternateServiceAccountCredential)
    {
        #check if credentials are in correct format DOMAIN\USERNAME
        $parts = @($AlternateServiceAccountCredential.Username.Split('\'))
        if ($parts.Count -ne 2 -or $parts[0] -eq '')
        {
            throw "The username must be fully qualified!"
        }
    }

    LogFunctionEntry -Parameters @{"Identity" = $Identity} -Verbose:$VerbosePreference

    #Establish remote Powershell session
    GetRemoteExchangeSession -Credential $Credential -CommandsToLoad "Set-ClientAccessServ*" -Verbose:$VerbosePreference

    RemoveParameters -PSBoundParametersIn $PSBoundParameters -ParamsToRemove "Credential"

    SetEmptyStringParamsToNull -PSBoundParametersIn $PSBoundParameters

    $serverVersion = Get-ExchangeVersion -ThrowIfUnknownVersion $true

    if ($serverVersion -in '2016','2019')
    {
        $setCasCmd = 'Set-ClientAccessService'
    }
    elseif ($serverVersion -eq '2013')
    {
        $setCasCmd = 'Set-ClientAccessServer'
    }

    # The AlternateServiceAccount can't be set with parameters other than Identity and DomainController, so execute as one off
    if ($null -ne $AlternateServiceAccountCredential)
    {
        $asaParams = @{
            Identity = $Identity
            AlternateServiceAccountCredential = $AlternateServiceAccountCredential
        }

        if (![String]::IsNullOrEmpty($DomainController))
        {
            $asaParams.Add('DomainController', $DomainController)
        }

        & $setCasCmd @asaParams

        $PSBoundParameters.Remove('AlternateServiceAccountCredential')
    }

    # Remove AlternateServiceAccount can't be performed with parameters other than Identity and DomainController, so execute as one off
    if ($RemoveAlternateServiceAccountCredentials)
    {
        $asaParams = @{
            Identity = $Identity
            RemoveAlternateServiceAccountCredentials = $true
        }

        if (![String]::IsNullOrEmpty($DomainController))
        {
            $asaParams.Add('DomainController', $DomainController)
        }

        & $setCasCmd @asaParams

        $PSBoundParameters.Remove('RemoveAlternateServiceAccountCredentials')
    }

    & $setCasCmd @PSBoundParameters
}


function Test-TargetResource
{
    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSDSCUseVerboseMessageInDSCResource", "")]
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $Identity,

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

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

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

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

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

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

        [Parameter()]
        [System.Boolean]
        $RemoveAlternateServiceAccountCredentials
    )

    LogFunctionEntry -Parameters @{"Identity" = $Identity} -Verbose:$VerbosePreference

    #Establish remote Powershell session
    GetRemoteExchangeSession -Credential $Credential -CommandsToLoad "Get-ClientAccessServ*" -Verbose:$VerbosePreference

    $cas = GetClientAccessServer @PSBoundParameters

    $testResults = $true

    if ($null -eq $cas)
    {
        Write-Error -Message 'Unable to retrieve Client Access Server settings for server'

        $testResults = $false
    }
    else
    {
        if (!(VerifySetting -Name "AutoDiscoverServiceInternalUri" -Type "String" -ExpectedValue $AutoDiscoverServiceInternalUri -ActualValue $cas.AutoDiscoverServiceInternalUri.AbsoluteUri -PSBoundParametersIn $PSBoundParameters -Verbose:$VerbosePreference))
        {
            $testResults = $false
        }

        if (!(VerifySetting -Name "AutoDiscoverSiteScope" -Type "Array" -ExpectedValue $AutoDiscoverSiteScope -ActualValue $cas.AutoDiscoverSiteScope -PSBoundParametersIn $PSBoundParameters -Verbose:$VerbosePreference))
        {
            $testResults = $false
        }

        if (!(VerifySetting -Name "AlternateServiceAccountCredential" -Type "PSCredential" -ExpectedValue $AlternateServiceAccountCredential -ActualValue ($cas.AlternateServiceAccountConfiguration.EffectiveCredentials | Sort-Object WhenAddedUTC | Select-Object -Last 1).Credential $PSBoundParameters -Verbose:$VerbosePreference))
        {
            $testResults = $false
        }
        if ($CleanUpInvalidAlternateServiceAccountCredentials)
        {
            Write-Verbose -Message 'CleanUpInvalidAlternateServiceAccountCredentials is set to $true. Forcing Test-TargetResource to return $false.'
            $testResults = $false
        }
        if ($RemoveAlternateServiceAccountCredentials -and ($cas.AlternateServiceAccountConfiguration.EffectiveCredentials.Count -gt 0))
        {
            Write-Verbose -Message 'RemoveAlternateServiceAccountCredentials is set to $true, and AlternateServiceAccountConfiguration currently has credentials configured. Returning $false.'
            $testResults = $false
        }
    }

    return $testResults
}

#Runs Get-ClientAcccessServer, only specifying Identity, and optionally DomainController
function GetClientAccessServer
{
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $Identity,

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

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

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

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

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

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

        [Parameter()]
        [System.Boolean]
        $RemoveAlternateServiceAccountCredentials
    )

    #Remove params we don't want to pass into the next command
    RemoveParameters -PSBoundParametersIn $PSBoundParameters -ParamsToKeep 'Identity','DomainController'

    $serverVersion = Get-ExchangeVersion -ThrowIfUnknownVersion $true
    if (($null -ne $AlternateServiceAccountCredential) -or ($RemoveAlternateServiceAccountCredentials))
    {
        $PSBoundParameters.Add('IncludeAlternateServiceAccountCredentialPassword',$true)
    }

    if ($serverVersion -in '2016','2019')
    {
        return (Get-ClientAccessService @PSBoundParameters)
    }
    elseif ($serverVersion -eq '2013')
    {
        return (Get-ClientAccessServer @PSBoundParameters)
    }
}

Export-ModuleMember -Function *-TargetResource