DSCResources/MSFT_SPSearchCrawlMapping/MSFT_SPSearchCrawlMapping.psm1

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

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

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

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

    Write-Verbose -Message "Getting Search Crawl Mapping for '$Url'"

    $result = Invoke-SPDSCCommand -Credential $InstallAccount `
                                  -Arguments $PSBoundParameters `
                                  -ScriptBlock {

        $params = $args[0]
        $searchApp = Get-SPEnterpriseSearchServiceApplication -Identity $params.ServiceAppName
        if($null -eq $searchApp) 
        {
            Write-Verbose -Message "Search Service Application $($params.ServiceAppName) not found"
            $returnVal = @{
                ServiceAppName = ""
                Url = $params.Url
                Target = ""
                Ensure = "Absent"
                InstallAccount = $params.InstallAccount
            }
            return $returnVal
        }        
        
        $mappings = $searchApp | Get-SPEnterpriseSearchCrawlMapping
        
        if($null -eq $mappings) 
        {
            Write-Verbose -Message "Search Service Application $($params.ServiceAppName) has no mappings"
            $returnVal = @{
                ServiceAppName = $params.ServiceAppName
                Url = $params.Url
                Target = ""
                Ensure = "Absent"
                InstallAccount = $params.InstallAccount
            }
            return $returnVal
        }
        
        $mapping = $mappings | Where-Object -FilterScript { $_.Source -eq "$($params.Url)" } | Select-Object -First 1
        
        if($null -eq $mapping) 
        {
            Write-Verbose "Search Service Application $($params.ServiceAppName) has no matching mapping"
            $returnVal = @{
                ServiceAppName = $params.ServiceAppName
                Url = $params.Url
                Target = ""
                Ensure = "Absent"
                InstallAccount = $params.InstallAccount
            }
            return $returnVal
        }
        else 
        {
            Write-Verbose "Search Service Application $($params.ServiceAppName) has a matching mapping"
            $returnVal = @{
                ServiceAppName = $params.ServiceAppName
                Url = $mapping.Source
                Target = $mapping.Target
                Ensure = "Present"
                InstallAccount = $params.InstallAccount
            }
            return $returnVal

        }
        
    }

    return $result
    
}


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

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

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

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

        [System.Management.Automation.PSCredential]
        $InstallAccount
    )
     Write-Verbose -Message "Setting Search Crawl Mapping Rule '$Url'"
    $result = Get-TargetResource @PSBoundParameters

    if($result.Ensure -eq "Absent" -and $Ensure -eq "Present") 
    {
        Write-Verbose "Adding the Crawl Mapping '$Url'"
       
        Invoke-SPDSCCommand -Credential $InstallAccount `
                            -Arguments $PSBoundParameters `
                            -ScriptBlock {
            $params = $args[0]

            $searchApp = Get-SPEnterpriseSearchServiceApplication -Identity $params.ServiceAppName
            if($null -eq $searchApp) 
            {
                throw [Exception] "The Search Service Application does not exist"
            }
            else 
            {
                New-SPEnterpriseSearchCrawlMapping -SearchApplication $searchApp -Url $params.Url -Target $params.Target                        
            }
        }
    }
    if($result.Ensure -eq "Present" -and $Ensure -eq "Present") 
    {
        Write-Verbose "Updating the Crawl Mapping '$Url'"
        Invoke-SPDSCCommand -Credential $InstallAccount `
                            -Arguments $PSBoundParameters `
                            -ScriptBlock {
            $params = $args[0]        

            $searchApp = Get-SPEnterpriseSearchServiceApplication -Identity $params.ServiceAppName
            $mappings = $searchApp | Get-SPEnterpriseSearchCrawlMapping
            $mapping = $mappings | Where-Object -FilterScript { $_.Source -eq $params.Url } | Select-Object -First 1
            $mapping | Remove-SPEnterpriseSearchCrawlMapping

            New-SPEnterpriseSearchCrawlMapping -SearchApplication $searchApp -Url $params.Url -Target $params.Target                            
        }
    }
    if($result.Ensure -eq "Present" -and $Ensure -eq "Absent") 
    {
        
        Write-Verbose "Removing the Crawl Mapping '$Url'"
        Invoke-SPDSCCommand -Credential $InstallAccount `
                            -Arguments $PSBoundParameters `
                            -ScriptBlock {
            $params = $args[0]
            
            $searchapp = Get-SPEnterpriseSearchServiceApplication -Identity $params.ServiceAppName
            $mappings = $searchApp | Get-SPEnterpriseSearchCrawlMapping
            $mapping = $mappings | Where-Object -FilterScript { $_.Source -eq $params.Url } | Select-Object -First 1
            $mapping | Remove-SPEnterpriseSearchCrawlMapping                    
        }
    }
}


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

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

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

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

        [System.Management.Automation.PSCredential]
        $InstallAccount
    )
    Write-Verbose -Message "Testing Search Crawl Mapping for '$Url'"
    
    $PSBoundParameters.Ensure = $Ensure

    $CurrentValues = Get-TargetResource @PSBoundParameters

    if($Ensure -eq "Present") 
    {
        return Test-SPDscParameterState -CurrentValues $CurrentValues `
                                        -DesiredValues $PSBoundParameters `
                                        -ValuesToCheck @("ServiceAppName","Url","Target","Ensure")
    }
    else 
    {
        return Test-SPDscParameterState -CurrentValues $CurrentValues `
                                        -DesiredValues $PSBoundParameters `
                                        -ValuesToCheck @("Ensure")
    }
}

Export-ModuleMember -Function *-TargetResource