Public/Get-AADGroupMembers.ps1

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<#
    .NOTES
    ===========================================================================
     Created with: SAPIEN Technologies, Inc., PowerShell Studio 2017 v5.4.135
     Created on: 2/14/2017 6:02 AM
     Created by: Mark Kraus
     Organization: Mitel
     Filename: Get-AADGroupMembers.ps1
    ===========================================================================
    .DESCRIPTION
        Get-AADGroupMembers Function
#>


<#
    .SYNOPSIS
        Returns the members for the given Group
    
    .DESCRIPTION
        Returns the members for the given Group
    
    .PARAMETER User
        A MSGraphAPI.DirectoryObject.Group object retruned by Get-AADGroup* cmdlets
    
    .PARAMETER BaseURL
        The Azure AD Graph Base URL. This is not required. Deafult
            https://graph.windows.net
    
    .PARAMETER APIVersion
        version of the API to use. Default is 1.6
    
    .EXAMPLE
        PS C:\> $AADGroupMembers = $AADGroup | Get-AADGroupMembers
    
    .NOTES
        Additional information about the function.
#>

function Get-AADGroupMembers {
    [CmdletBinding(SupportsShouldProcess = $true)]
    [OutputType('MSGraphAPI.DirectoryObject.User')]
    param
    (
        [Parameter(Mandatory = $true,
                   ValueFromPipeline = $true,
                   ValueFromPipelineByPropertyName = $true)]
        [ValidateNotNullOrEmpty()]
        [PSTypeName('MSGraphAPI.DirectoryObject.Group')]
        [object[]]$Group,
        
        [Parameter(Mandatory = $false,
                   ValueFromPipelineByPropertyName = $true)]
        [string]$BaseUrl = 'https://graph.windows.net',
        
        [Parameter(ValueFromPipelineByPropertyName = $true)]
        [string]$APIVersion = '1.6'
    )
    
    process {
        Foreach ($GroupObject in $Group) {
            if (-not $pscmdlet.ShouldProcess($GroupObject.objectId)) {
                return
            }
            $AccessToken = $GroupObject._AccessToken
            $Application = $AccessToken.Application
            $Tenant = $Application.Tenant
            $SkipToken = $null
            do {
                $Url = '{0}/{1}/{2}/{3}/{4}?api-version={5}{6}' -f @(
                    $BaseUrl
                    $Tenant
                    'groups'
                    $GroupObject.objectId
                    'members'
                    $APIversion
                    $SkipToken
                )
                $Params = @{
                    Uri = $Url
                    Method = 'GET'
                    AccessToken = $AccessToken
                    ErrorAction = 'Stop'
                }
                try {
                    $Results = Invoke-GraphRequest @Params
                }
                catch {
                    $ErrorMessage = "Unable to query members for group '{0}': {1}" -f $GroupObject.objectId, $_.Exception.Message
                    Write-Error $ErrorMessage
                    break
                }
                foreach ($Result in $Results.ContentObject.value) {
                    $OutputObject = $Result.psobject.copy()
                    $OutputObject.psobject.TypeNames.Insert(0, 'MSGraphAPI.DirectoryObject.User')
                    $OutputObject | Add-Member -MemberType NoteProperty -Name _AccessToken -Value $AccessToken
                    $OutputObject
                }
                $SkipToken = $Results.ContentObject.'odata.nextLink' -replace '^.*skiptoken', '&$skiptoken'
            }
            while ($SkipToken)
        }
    }
}