feat: new Guest Invite standard

Modules/CIPPCore/Public/Standards/Invoke-CIPPStandardGuestInvite.ps1

@@ -0,0 +1,68 @@
+function Invoke-CIPPStandardGuestInvite {
+    <#
+    .FUNCTIONALITY
+        Internal
+    .COMPONENT
+        (APIName) GuestInvite
+    .SYNOPSIS
+        (Label) Guest Invite settings
+    .DESCRIPTION
+        (Helptext) This setting controls who can invite guests to your directory to collaborate on resources secured by your company, such as SharePoint sites or Azure resources.
+        (DocsDescription) This setting controls who can invite guests to your directory to collaborate on resources secured by your company, such as SharePoint sites or Azure resources.
+    .NOTES
+        CAT
+            InTune Standards
+        TAG
+            "highimpact"
+        ADDEDCOMPONENT
+        IMPACT
+            High Impact
+        RECOMMENDEDBY
+        UPDATECOMMENTBLOCK
+            Run the Tools\Update-StandardsComments.ps1 script to update this comment block
+    .LINK
+        https://docs.cipp.app/user-documentation/tenant/standards/edit-standards
+    #>
+
+    param($Tenant, $Settings)
+
+    $CurrentState = New-GraphGetRequest -Uri 'https://graph.microsoft.com/beta/policies/authorizationPolicy/authorizationPolicy' -tenantid $Tenant
+
+    if ($null -eq $Settings.allowInvitesFrom) { $Settings.allowInvitesFrom = 'Everyone' } # none, adminsAndGuestInviters, adminsGuestInvitersAndAllMembers, everyone
+    $StateIsCorrect =   ($CurrentState.allowInvitesFrom -eq $Settings.allowInvitesFrom)
+
+    if ($Settings.remediate -eq $true) {
+        if ($StateIsCorrect -eq $true) {
+            Write-LogMessage -API 'Standards' -Tenant $Tenant -Message 'Guest Invite settings is already applied correctly.' -Sev Info
+        } else {
+            try {
+                $GraphRequest = @{
+                    tenantID    = $Tenant
+                    uri         = "https://graph.microsoft.com/beta/policies/authorizationPolicy/authorizationPolicy"
+                    AsApp       = $false
+                    Type        = 'PATCH'
+                    ContentType = 'application/json; charset=utf-8'
+                    Body        = [pscustomobject]@{
+                        allowInvitesFrom = $Settings.allowInvitesFrom
+                    } | ConvertTo-Json -Compress
+                }
+                New-GraphPostRequest @GraphRequest
+                Write-LogMessage -API 'Standards' -Tenant $Tenant -Message "Successfully updated Guest Invite setting to $($Settings.allowInvitesFrom)" -Sev Info
+            } catch {
+                Write-LogMessage -API 'Standards' -Tenant $Tenant -Message "Failed to update Guest Invite setting to $($Settings.allowInvitesFrom)" -Sev Error -LogData $_
+            }
+        }
+    }
+
+    if ($Settings.alert -eq $true) {
+        if ($StateIsCorrect -eq $true) {
+            Write-LogMessage -API 'Standards' -tenant $tenant -message 'Guest Invite settings is enabled.' -sev Info
+        } else {
+            Write-LogMessage -API 'Standards' -tenant $tenant -message 'Guest Invite settings is not enabled.' -sev Alert
+        }
+    }
+
+    if ($Settings.report -eq $true) {
+        Add-CIPPBPAField -FieldName 'GuestInvite' -FieldValue $StateIsCorrect -StoreAs bool -Tenant $tenant
+    }
+}