Scripts/Get-BPAUserGroup.ps1

function Get-BPAUserGroup {
    <#
        .SYNOPSIS
            Gets AutoMate BPA user groups.
 
        .DESCRIPTION
            Get-BPAUserGroup gets user group objects from AutoMate BPA. Get-BPAUserGroup can receive items on the pipeline and return related objects.
 
        .PARAMETER InputObject
            The object(s) to use in search for user groups.
 
        .PARAMETER Name
            The name of the user group (case sensitive). Wildcard characters can be escaped using the ` character. If using escaped wildcards, the string
            must be wrapped in single quotes. For example: Get-BPAUserGroup -Name '`[Test`]'
 
        .PARAMETER ID
            The ID of the user group.
 
        .PARAMETER FilterSet
            The parameters to filter the search on. Supply hashtable(s) with the following properties: Property, Comparator, Value.
            Valid values for the Comparator are: =, !=, <, >, contains (default - no need to supply Comparator when using 'contains')
 
        .PARAMETER FilterSetMode
            If multiple filter sets are provided, FilterSetMode determines if the filter sets should be evaluated with an AND or an OR
 
        .PARAMETER SortProperty
            The object property to sort results on. Do not use BPAServer or TypeName, since those are custom properties added by this module, and not exposed in the API.
 
        .PARAMETER SortDescending
            If specified, this will sort the output on the specified SortProperty in descending order. Otherwise, ascending order is assumed.
 
        .PARAMETER BPAServer
            The AutoMate BPA management server.
 
        .INPUTS
            Agents related to the following objects can be retrieved by this function:
            User
            Folder
 
        .EXAMPLE
            # Get user group "group01"
            Get-BPAUserGroup "group01"
 
        .EXAMPLE
            # Get group membership for user "MyUsername"
            Get-BPAUser "MyUsername" | Get-BPAUserGroup
 
        .EXAMPLE
            # Get folders using filter sets
            Get-BPAUserGroup -FilterSet @{ Property = "Name"; Value = "admin"}
 
        .NOTES
            Author(s): : David Seibel
            Contributor(s) :
            Date Created : 08/24/2016
            Date Modified : 05/03/2018
 
        .LINK
            https://github.com/davidseibel/PoshBPA
    #>

    [CmdletBinding(DefaultParameterSetName = "All")]
    [OutputType([System.Object[]])]
    param(
        [Parameter(ValueFromPipeline = $true, ParameterSetName = "ByPipeline")]
        [ValidateNotNullOrEmpty()]
        $InputObject,

        [Parameter(Position = 0)]
        [ValidateNotNullOrEmpty()]
        [string]$Name,

        [Parameter(ParameterSetName = "ByID")]
        [ValidateNotNullOrEmpty()]
        [string]$ID,

        [Hashtable[]]$FilterSet,

        [ValidateSet("And","Or")]
        [string]$FilterSetMode = "And",

        [ValidateNotNullOrEmpty()]
        [string[]]$SortProperty = "Name",

        [switch]$SortDescending = $false,

        [ValidateNotNullOrEmpty()]
        [string]$BPAServer
    )
    
    BEGIN {
        # If the server is specified, or only 1 server is connected, don't show it. Otherwise, show the server.
        if ($PSCmdlet.ParameterSetName -eq "ByID" -and (-not $PSBoundParameters.ContainsKey("BPAServer")) -and ($global:BPAConnectionInfo.Count -gt 1)) {
            throw "When searching by ID: 1) BPAServer must be specified, OR 2) only one server can be connected."
        }
        $splat = @{
            RestMethod = "Get"
            BPAServer  = $BPAServer
        }
        $result = @()
        $userGroupCache = @{}
        if ($PSBoundParameters.ContainsKey("Name") -and (-not [System.Management.Automation.WildcardPattern]::ContainsWildcardCharacters($Name))) {
            $FilterSet += @{Property = "Name"; Comparator = "="; Value = [System.Management.Automation.WildcardPattern]::Unescape($Name)}
        } elseif ($PSBoundParameters.ContainsKey("Name") -and [System.Management.Automation.WildcardPattern]::ContainsWildcardCharacters($Name)) {
            try   { "" -like $Name | Out-Null } # Test wildcard string
            catch { throw }                     # Throw error if wildcard invalid
            $splat += @{ FilterScript = {$_.Name -like $Name} }
        }
    }

    PROCESS {
        switch($PSCmdlet.ParameterSetName) {
            "All" {
                $splat += @{ Resource = Format-BPAUri -Path "user_groups/list" -FilterSet $FilterSet -FilterSetMode $FilterSetMode -SortProperty $SortProperty -SortDescending:$SortDescending.ToBool() }
                $result = Invoke-BPARestMethod @splat
            }
            "ByID" {
                $splat += @{ Resource = "user_groups/$ID/get" }
                $result = Invoke-BPARestMethod @splat 
            }
            "ByPipeline" {
                foreach ($obj in $InputObject) {
                    $tempSplat = $splat
                    if (-not $tempSplat.ContainsKey("BPAServer")) {
                        $tempSplat += @{ BPAServer = $obj.BPAServer } 
                    } else { 
                        $tempSplat["BPAServer"] = $obj.BPAServer
                    }
                    if (-not $userGroupCache.ContainsKey($obj.BPAServer)) {
                        Write-Verbose "Caching user group objects for server $($obj.BPAServer) for better performance"
                        $userGroupCache.Add($obj.BPAServer, (Get-BPAUserGroup -FilterSet $FilterSet -FilterSetMode $FilterSetMode -SortProperty $SortProperty -SortDescending:$SortDescending.ToBool() -BPAServer $obj.BPAServer))
                    }
                    switch ($obj.TypeName) {
                        "User" {
                            foreach ($userGroup in $userGroupCache[$obj.BPAServer]) {
                                if ($userGroup.UserIDs -contains $obj.ID) {
                                    $result += $userGroup
                                }
                            }
                        }
                        "Folder" {
                            # Get folders contained within the provided folder(s)
                            $result += $userGroupCache[$obj.BPAServer] | Where-Object {$_.ParentID -eq $obj.ID}
                        }
                        "SystemPermission" {
                            $result += Get-BPAUserGroup -ID $obj.GroupID
                        }
                        default {
                            $unsupportedType = $obj.GetType().FullName
                            if ($_) { 
                                $unsupportedType = $_ 
                            } elseif (($null -ne $obj.Type) -and ($obj.Type -ne "")) {
                                $unsupportedType = $obj.Type
                            }
                            Write-Error -Message "Unsupported input type '$unsupportedType' encountered!" -TargetObject $obj
                        }
                    }
                }
            }
        }
    }

    END {
        $SortProperty += "BPAServer", "ID"
        return $result | Sort-Object $SortProperty -Unique -Descending:$SortDescending.ToBool()
    }
}