How to create a site and add security groups through code: scripts, csom, ... ?

Question

Hi,
I'm new to CSOM and are looking for a way to create sites in SharePoint Office365 and especially add user to it with a specific role eg. 'visitor' or 'owner'.
I use this code to add sites from a csv file, so far so good.
But now I want to add security groups based on the csv file and assign a role. The security groups allready exists.
and also how to add a user with a 'owner' role for some sites.
That would make my life easier :-)
so thank you in advance!
# load assemblies
#[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client")
#[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.Runtime")
Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"
# site collection
$siteUrl = “https://mysharepoint.com”
# admin
$username = "[email protected]"
$password = Read-Host -Prompt "Enter password" -AsSecureString
# get clientcontext as object
$ctx = New-Object Microsoft.SharePoint.Client.ClientContext($siteUrl)
# assign credentials to clientcontext object
$credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($username, $password)
$ctx.Credentials = $credentials
# create site from template 'teamsite' => STS#0
$data = Import-Csv "c:\tools\CSOM\vakwerking_test.csv"
foreach ($row in $data) {
$webCreationInformation = New-Object Microsoft.SharePoint.Client.WebCreationInformation
$webCreationInformation.Url = $row.vakwerkingurl
$webCreationInformation.Title = $row.vakwerkingnaam
$webCreationInformation.WebTemplate = "STS#0"
$webCreationInformation.UseSamePermissionsAsParentSite = $false
$newWeb = $ctx.Web.Webs.Add($webCreationInformation)
Write-Host "Title" $newWeb.Title
#send to sharepoint
$ctx.Load($newWeb)
$ctx.ExecuteQuery()

Answer 1

Hi,
The command above about creating a group only works for the root site of the site collection, because the scope of the user group is site collection level, these groups
can be used in all the sites in this site collection.
With the existing groups in the root site, we can add users into them and grant specific permissions of a specific sub site to these groups.
Here is a demo about how to assign permission to a group using Client Object Model(though in C#) for your reference:
http://www.c-sharpcorner.com/UploadFile/54db21/set-permission-to-group-in-sharepoint-2010-programmatically/
Best regards,
Patrick
Patrick Liang
TechNet Community Support