WDACConfig

0.3.8

XMLOps/Remove-DuplicateAllowAndFileRuleRefElements_IDBased.psm1

                                Function Remove-DuplicateAllowAndFileRuleRefElements_IDBased {

    <#

    .SYNOPSIS

        Removes duplicates <Allow> elements from the <FileRules> nodes

        and <FileRuleRef> elements from the <FileRulesRef> nodes in every <ProductSigners> node of each <SigningScenario> node

        The criteria for removing duplicates is the ID attribute of the <Allow> elements and the RuleID attribute of the <FileRuleRef> elements

    .PARAMETER XmlFilePath

        The file path of the XML document to be modified

    .INPUTS

        System.IO.FileInfo

    .OUTPUTS

        System.Void

    #>

    [CmdletBinding()]

    [OutputType([System.Void])]

    param (

        [Parameter(Mandatory = $true)][System.IO.FileInfo]$XmlFilePath

    )

    Begin {

        # Importing the $PSDefaultParameterValues to the current session, prior to everything else

        . "$ModuleRootPath\CoreExt\PSDefaultParameterValues.ps1"

        # Load the XML document from the specified file path

        [System.Xml.XmlDocument]$XmlDocument = Get-Content -Path $XmlFilePath

        # Create a namespace manager for handling XML namespaces

        [System.Xml.XmlNamespaceManager]$NsMgr = New-Object -TypeName System.Xml.XmlNamespaceManager -ArgumentList $XmlDocument.NameTable

        $NsMgr.AddNamespace('sip', 'urn:schemas-microsoft-com:sipolicy')

    }

    Process {

        # Remove duplicate <Allow> elements within the <FileRules> section

        [System.Xml.XmlNodeList]$AllowElements = $XmlDocument.SelectNodes('//sip:FileRules/sip:Allow', $NsMgr)

        [System.Collections.Hashtable]$UniqueAllowIDs = @{}

        foreach ($AllowElement in $AllowElements) {

            [System.String]$AllowID = $AllowElement.ID

            if ($UniqueAllowIDs.ContainsKey($AllowID)) {

                Write-Verbose "Removing duplicate Allow element with ID: $AllowID"

                [System.Void]$AllowElement.ParentNode.RemoveChild($AllowElement)

            }

            else {

                $UniqueAllowIDs[$AllowID] = $true

            }

        }

        # Remove duplicate <FileRuleRef> elements within <FileRulesRef> under <ProductSigners> nodes

        [System.Xml.XmlNodeList]$SigningScenarios = $XmlDocument.SelectNodes('//sip:SigningScenarios/sip:SigningScenario', $NsMgr)

        foreach ($Scenario in $SigningScenarios) {

            $ProductSigners = $Scenario.ProductSigners

            $FileRulesRefs = $ProductSigners.FileRulesRef

            foreach ($FileRulesRef in $FileRulesRefs) {

                [System.Collections.Hashtable]$UniqueFileRuleRefIDs = @{}

                [System.Xml.XmlElement[]]$FileRuleRefs = $FileRulesRef.FileRuleRef

                foreach ($FileRuleRef in $FileRuleRefs) {

                    [System.String]$RuleID = $FileRuleRef.RuleID

                    if ($UniqueFileRuleRefIDs.ContainsKey($RuleID)) {

                        Write-Verbose "Removing duplicate FileRuleRef element with ID: $RuleID"

                        [System.Void]$FileRulesRef.RemoveChild($FileRuleRef)

                    }

                    else {

                        $UniqueFileRuleRefIDs[$RuleID] = $true

                    }

                }

            }

        }

    }

    End {

        # Save the modified XML document back to the original file path

        $XmlDocument.Save($XmlFilePath)

    }

}

Export-ModuleMember -Function 'Remove-DuplicateAllowAndFileRuleRefElements_IDBased'

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