Recursively gets RoleAssignments for a SharePoint site and subsites

SP-GetRoleAssignmentsRecursive.ps1

[CmdletBinding()]
Param(
    [Parameter(Mandatory=$true, HelpMessage="This is the path to the CSV file.")]
    [string]$CSVFile,

    [Parameter(Mandatory=$true, HelpMessage="This is the URL to the SharePoint Online site.")]
    [string]$Url, 

    [Parameter(Mandatory=$false, HelpMessage="This is the path to the DLLs for CSOM.")]
    [string]$CSOMPath
)

Set-Strictmode -Version 1

If ($CSOMPath -eq $null -or $CSOMPath -eq "") { $CSOMPath = "." }
Add-Type -Path "$CSOMPath\Microsoft.SharePoint.Client.dll" 
Add-Type -Path "$CSOMPath\Microsoft.SharePoint.Client.Runtime.dll" 

function getWeb ([Microsoft.SharePoint.Client.Web]$currentWeb) {
    $context.Load($currentWeb)
    $context.Load($currentWeb.RoleAssignments)
    $context.Load($currentWeb.Webs)
    $context.ExecuteQuery()

    Write-Host $currentWeb.Title: $currentWeb.Url

    $currentWeb.RoleAssignments | ForEach-Object { 
        $context.Load($_.Member)
        $context.Load($_.RoleDefinitionBindings)
    }
    $context.ExecuteQuery()

    $currentWeb.RoleAssignments | ForEach-Object {
        $loginName = $_.Member.LoginName
        $_.RoleDefinitionBindings | ForEach-Object {
            $csvLine = New-Object -TypeName PSCustomObject -Property @{
                'WebTitle'=$currentWeb.Title;
                'WebUrl'=$currentWeb.Url;
                'MemberLogin'=$loginName;
                'RoleDefinition'=$_.Name;
            }
            Export-CSV -Append -NoTypeInformation -InputObject $csvLine -Path $CSVFile
        }
    }
    
    $currentWeb.Webs | ForEach-Object {
        getWeb($_)
    }
}

$psCredentials = Get-Credential
$spoCredentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($psCredentials.UserName, $psCredentials.Password)
$context = New-Object Microsoft.SharePoint.Client.ClientContext($Url) 
$context.Credentials = $spoCredentials 

If ($context.ServerObjectIsNull.Value) { 
    Write-Error "Could not connect to SharePoint Online site collection: $Url"
} Else {
    Write-Host "Connected to SharePoint Online site collection: " $Url -ForegroundColor Green        
                
    $web = $context.Web
    getWeb($web)
}