Create Multiple SPGroups in all the subsites if the SPGroups doesn't exist using power Shell script - sharepoint

Question

I need to create 2 SPGroups in the SubSites with Multiple AD Group members added to the group.
For Example,
I have sub sites x,y,z under my Site
I have groups Group A, Group B
Members of Group A are Member1, Member2, Member3
Members of Group B are Member1, Member2, Member3, Member4, Member5
I need to create the groups in the sub sites if they doesn't exist.
Please let me know for any better approach.
I am trying to do that using Power shell.
$SPWeb = $Web.Read()
if ($SPWeb.SiteGroups[$GroupName] -ne $null){
throw "Group $GroupName already exists!"
}
if ($SPWeb.Site.WebApplication.UseClaimsAuthentication){
$op = New-SPClaimsPrincipal $OwnerName -IdentityType WindowsSamAccountName
$mp = New-SPClaimsPrincipal $MemberName -IdentityType WindowsSamAccountName
$owner = $SPWeb | Get-SPUser $op
$member = $SPWeb | Get-SPUser $mp
}
else {
$owner = $SPWeb | Get-SPUser $OwnerName
$member = $SPWeb | Get-SPUser $MemberName
}
$SPWeb.SiteGroups.Add($GroupName, $owner, $member, $Description)
$SPGroup = $SPWeb.SiteGroups[$GroupName]
$SPWeb.RoleAssignments.Add($SPGroup)
$SPWeb.Dispose()

Answer 1

#Create an XML with all the details for the new Groups and menbers for the groups
<?xml version="1.0"?>
<Groups>
<Group name="GroupA" description="Test GroupA" PermissionLevel="Contribute">
<Users>
<User>Domain\Member1</User>
<User>Domain\Member2</User>
<User>Domain\Member3</User>
</Users>
</Group>
<Group name="GroupB" description="Test GroupB" PermissionLevel="Read">
<Users>
<User>Domain\Member1</User>
<User>Domain\Member2</User>
<User>Domain\Member3</User>
<User>Domain\Member4</User>
<User>Domain\Member5</User>
</Users>
</Group>
#Now create a script file with the below script
#Get Site and Web objects
$site = get-spsite https://portal/site/Test/
#Get all the sub sites under the web
foreach($web in $site.allwebs)
{
#Get XML file containing groups and associated users
$groupsXML = [xml] (Get-Content ("C:\Temp\Groups.XML"))
#Walk through each group node defined in the XML file
$groupsXML.Groups.Group | ForEach-Object {
[string]$permissionLevel = $_.PermissionLevel
#Check to see if SharePoint group already exists in the site collection
if ($web.SiteGroups[$_.name] -eq $null)
{
#If the SharePoint group doesn't exist already - create it from the name and description values at the node
$web.SiteGroups.Add($_.name, $web.CurrentUser, $null, $_.description)
$newGroup = $web.SiteGroups[$_.name]
}
#Get SharePoint group from the site collection
$group = $web.SiteGroups[$_.name]
#Add the users defined in the XML to the SharePoint group
$_.Users.User | ForEach-Object {
$group.AddUser($_, "", "", "")
}
$roleAssignment = new-object Microsoft.SharePoint.SPRoleAssignment($group)
$roleDefinition = $web.Site.RootWeb.RoleDefinitions[$permissionLevel]
$roleAssignment.RoleDefinitionBindings.Add($roleDefinition)
$web.RoleAssignments.Add($roleAssignment)
Write-Host "Group Name: "$group" Created at site: " $web.url
}
#Dispose of Web and Site objects
$web.Dispose()
$site.Dispose()
}