From 8b4845854599d2979adab56c65aeebfbaf5ce66c Mon Sep 17 00:00:00 2001
From: haydarkozat <haydarrana@gmail.com>
Date: Sat, 29 Aug 2026 16:19:13 +0300
Subject: [PATCH] feat: add department group assignment script

---
 .../Set-DepartmentGroupMemberships.ps1        | 100 ++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 enterprise-lab/scripts/Set-DepartmentGroupMemberships.ps1

diff --git a/enterprise-lab/scripts/Set-DepartmentGroupMemberships.ps1 b/enterprise-lab/scripts/Set-DepartmentGroupMemberships.ps1
new file mode 100644
index 0000000..4c7215c
--- /dev/null
+++ b/enterprise-lab/scripts/Set-DepartmentGroupMemberships.ps1
@@ -0,0 +1,100 @@
+[CmdletBinding(SupportsShouldProcess = $true, ConfirmImpact = 'Medium')]
+param(
+    [Parameter(Mandatory)]
+    [ValidateScript({ Test-Path -LiteralPath $_ })]
+    [string]$CsvPath
+)
+
+$ErrorActionPreference = 'Stop'
+
+foreach ($moduleName in @('Microsoft.Graph.Users', 'Microsoft.Graph.Groups')) {
+    if (-not (Get-Module -ListAvailable -Name $moduleName)) {
+        throw "Required module '$moduleName' is not installed. Install-Module Microsoft.Graph -Scope CurrentUser"
+    }
+}
+
+Import-Module Microsoft.Graph.Users
+Import-Module Microsoft.Graph.Groups
+
+$context = Get-MgContext
+if (-not $context) {
+    throw 'No Microsoft Graph session found. Connect first.'
+}
+
+$rows = @(Import-Csv -LiteralPath $CsvPath)
+if ($rows.Count -eq 0) {
+    throw 'CSV contains no users.'
+}
+
+$results = foreach ($row in $rows) {
+    $upn = [string]$row.UserPrincipalName
+    $department = [string]$row.Department
+
+    if ([string]::IsNullOrWhiteSpace($upn) -or [string]::IsNullOrWhiteSpace($department)) {
+        [pscustomobject]@{
+            UserPrincipalName = $upn
+            Department        = $department
+            Group             = $null
+            Status            = 'Skipped'
+            Reason            = 'Missing UPN or Department.'
+        }
+        continue
+    }
+
+    $groupName = "SG-Dept-$department"
+    $escapedUpn = $upn.Replace("'", "''")
+    $escapedGroup = $groupName.Replace("'", "''")
+
+    $user = Get-MgUser -Filter "userPrincipalName eq '$escapedUpn'" -Property Id, UserPrincipalName
+    if (-not $user) {
+        [pscustomobject]@{
+            UserPrincipalName = $upn
+            Department        = $department
+            Group             = $groupName
+            Status            = 'Skipped'
+            Reason            = 'User not found.'
+        }
+        continue
+    }
+
+    $group = Get-MgGroup -Filter "displayName eq '$escapedGroup'" -Property Id, DisplayName
+    if (-not $group) {
+        [pscustomobject]@{
+            UserPrincipalName = $upn
+            Department        = $department
+            Group             = $groupName
+            Status            = 'Skipped'
+            Reason            = 'Department group not found.'
+        }
+        continue
+    }
+
+    $memberIds = @(Get-MgGroupMember -GroupId $group.Id -All | ForEach-Object { $_.Id })
+    if ($user.Id -in $memberIds) {
+        [pscustomobject]@{
+            UserPrincipalName = $upn
+            Department        = $department
+            Group             = $groupName
+            Status            = 'Existing'
+            Reason            = 'Membership already exists.'
+        }
+        continue
+    }
+
+    $target = "$upn -> $groupName"
+    if ($PSCmdlet.ShouldProcess($target, 'Add Microsoft Entra group membership')) {
+        New-MgGroupMemberByRef -GroupId $group.Id -BodyParameter @{
+            '@odata.id' = "https://graph.microsoft.com/v1.0/directoryObjects/$($user.Id)"
+        }
+
+        [pscustomobject]@{
+            UserPrincipalName = $upn
+            Department        = $department
+            Group             = $groupName
+            Status            = 'Added'
+            Reason            = 'Department membership assigned.'
+        }
+    }
+}
+
+$results | Sort-Object Group, UserPrincipalName