DSCResources/MSFT_SPStateServiceApp/MSFT_SPStateServiceApp.psm1

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

        [parameter(Mandatory = $true)]  
        [System.String] 
        $DatabaseName,

        [parameter(Mandatory = $false)] 
        [System.String] 
        $DatabaseServer,

        [parameter(Mandatory = $false)] 
        [ValidateSet("Present","Absent")] 
        [System.String] 
        $Ensure = "Present",

        [parameter(Mandatory = $false)] 
        [System.Management.Automation.PSCredential] 
        $DatabaseCredentials,

        [parameter(Mandatory = $false)] 
        [System.Management.Automation.PSCredential] 
        $InstallAccount
    )

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

    $result = Invoke-SPDSCCommand -Credential $InstallAccount `
                                  -Arguments $PSBoundParameters `
                                  -ScriptBlock {
        $params = $args[0]
        
        $serviceApp = Get-SPStateServiceApplication -Identity $params.Name `
                                                    -ErrorAction SilentlyContinue

        if ($null -eq $serviceApp) 
        { 
            return @{
                Name = $params.Name
                Ensure = "Absent"
                InstallAccount = $params.InstallAccount
            } 
        }
        
        return @{
            Name = $serviceApp.DisplayName
            DatabaseName = $serviceApp.Databases.Name
            DatabaseServer = $serviceApp.Databases.Server.Name
            InstallAccount = $params.InstallAccount
            Ensure = "Present"
        }
    }
    return $result
}

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

        [parameter(Mandatory = $true)]  
        [System.String] 
        $DatabaseName,

        [parameter(Mandatory = $false)] 
        [System.String] 
        $DatabaseServer,

        [parameter(Mandatory = $false)] 
        [ValidateSet("Present","Absent")] 
        [System.String] 
        $Ensure = "Present",

        [parameter(Mandatory = $false)] 
        [System.Management.Automation.PSCredential] 
        $DatabaseCredentials,

        [parameter(Mandatory = $false)] 
        [System.Management.Automation.PSCredential] 
        $InstallAccount
    )

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

    if ($Ensure -eq "Present") 
    {
        Write-Verbose -Message "Creating State Service Application $Name"
        Invoke-SPDSCCommand -Credential $InstallAccount `
                            -Arguments $PSBoundParameters `
                            -ScriptBlock {

            $params = $args[0]
            
            $dbParams = @{}
            if ($params.ContainsKey("DatabaseName")) 
            { 
                $dbParams.Add("Name", $params.DatabaseName) 
            }
            if ($params.ContainsKey("DatabaseServer")) 
            { 
                $dbParams.Add("DatabaseServer", $params.DatabaseServer) 
            }
            if ($params.ContainsKey("DatabaseCredentials")) 
            { 
                $dbParams.Add("DatabaseCredentials", $params.DatabaseCredentials) 
            }

            $database = New-SPStateServiceDatabase @dbParams
            $app = New-SPStateServiceApplication -Name $params.Name -Database $database 
            New-SPStateServiceApplicationProxy -ServiceApplication $app -DefaultProxyGroup | Out-Null
        }
    }
    if ($Ensure -eq "Absent") 
    {
        Write-Verbose -Message "Removing State Service Application $Name"
        Invoke-SPDSCCommand -Credential $InstallAccount -Arguments $PSBoundParameters -ScriptBlock {
            $params = $args[0]
            
            $serviceApp =  Get-SPStateServiceApplication -Name $params.Name
            Remove-SPServiceApplication $serviceApp -Confirm:$false
        }
    }
}

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

        [parameter(Mandatory = $true)]  
        [System.String] 
        $DatabaseName,

        [parameter(Mandatory = $false)] 
        [System.String] 
        $DatabaseServer,

        [parameter(Mandatory = $false)] 
        [ValidateSet("Present","Absent")] 
        [System.String] 
        $Ensure = "Present",

        [parameter(Mandatory = $false)] 
        [System.Management.Automation.PSCredential] 
        $DatabaseCredentials,

        [parameter(Mandatory = $false)] 
        [System.Management.Automation.PSCredential] 
        $InstallAccount
    )

    Write-Verbose -Message "Testing for state service application $Name"

    $PSBoundParameters.Ensure = $Ensure

    $CurrentValues = Get-TargetResource @PSBoundParameters

    return Test-SPDscParameterState -CurrentValues $CurrentValues `
                                    -DesiredValues $PSBoundParameters `
                                    -ValuesToCheck @("Name", "Ensure")
}

Export-ModuleMember -Function *-TargetResource