DSCResources/MSFT_SPServiceAppPool/MSFT_SPServiceAppPool.psm1

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

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $InstallAccount
    )

    Write-Verbose -Message "Getting service application pool '$Name'"

    $result = Invoke-SPDscCommand -Credential $InstallAccount `
        -Arguments $PSBoundParameters `
        -ScriptBlock {
        $params = $args[0]

        $sap = Get-SPServiceApplicationPool -Identity $params.Name `
            -ErrorAction SilentlyContinue
        if ($null -eq $sap)
        {
            return @{
                Name           = $params.Name
                ServiceAccount = $params.ProcessAccountName
                Ensure         = "Absent"
            }
        }
        return @{
            Name           = $sap.Name
            ServiceAccount = $sap.ProcessAccountName
            Ensure         = "Present"
        }
    }
    return $result
}

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

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $InstallAccount
    )

    Write-Verbose -Message "Setting service application pool '$Name'"

    $CurrentValues = Get-TargetResource @PSBoundParameters

    if ($CurrentValues.Ensure -eq "Absent" -and $Ensure -eq "Present")
    {
        Write-Verbose -Message "Creating Service Application Pool $Name"
        Invoke-SPDscCommand -Credential $InstallAccount `
            -Arguments $PSBoundParameters `
            -ScriptBlock {
            $params = $args[0]

            New-SPServiceApplicationPool -Name $params.Name `
                -Account $params.ServiceAccount

            $sap = Get-SPServiceApplicationPool -Identity $params.Name `
                -ErrorAction SilentlyContinue
            if ($null -ne $sap)
            {
                if ($sap.ProcessAccountName -ne $params.ServiceAccount)
                {
                    Set-SPServiceApplicationPool -Identity $params.Name `
                        -Account $params.ServiceAccount
                }
            }
        }
    }
    if ($CurrentValues.Ensure -eq "Present" -and $Ensure -eq "Present")
    {
        Write-Verbose -Message "Updating Service Application Pool $Name"
        Invoke-SPDscCommand -Credential $InstallAccount `
            -Arguments $PSBoundParameters `
            -ScriptBlock {
            $params = $args[0]

            $sap = Get-SPServiceApplicationPool -Identity $params.Name `
                -ErrorAction SilentlyContinue
            if ($sap.ProcessAccountName -ne $params.ServiceAccount)
            {
                Set-SPServiceApplicationPool -Identity $params.Name `
                    -Account $params.ServiceAccount
            }
        }
    }
    if ($Ensure -eq "Absent")
    {
        Write-Verbose -Message "Removing Service Application Pool $Name"
        Invoke-SPDscCommand -Credential $InstallAccount `
            -Arguments $PSBoundParameters `
            -ScriptBlock {
            $params = $args[0]
            Remove-SPServiceApplicationPool -Identity $params.Name -Confirm:$false
        }
    }
}

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

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

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

        [Parameter()]
        [System.Management.Automation.PSCredential]
        $InstallAccount
    )

    Write-Verbose -Message "Testing service application pool '$Name'"

    $PSBoundParameters.Ensure = $Ensure

    $CurrentValues = Get-TargetResource @PSBoundParameters

    Write-Verbose -Message "Current Values: $(Convert-SPDscHashtableToString -Hashtable $CurrentValues)"
    Write-Verbose -Message "Target Values: $(Convert-SPDscHashtableToString -Hashtable $PSBoundParameters)"

    if ($Ensure -eq "Present")
    {
        $result = Test-SPDscParameterState -CurrentValues $CurrentValues `
            -Source $($MyInvocation.MyCommand.Source) `
            -DesiredValues $PSBoundParameters `
            -ValuesToCheck @("ServiceAccount", "Ensure")
    }
    else
    {
        $result = Test-SPDscParameterState -CurrentValues $CurrentValues `
            -Source $($MyInvocation.MyCommand.Source) `
            -DesiredValues $PSBoundParameters `
            -ValuesToCheck @("Ensure")
    }

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

    return $result
}

Export-ModuleMember -Function *-TargetResource