Add site limit

CHANGELOG-WIP.md

@@ -359,6 +359,8 @@
 - Added `craft\services\ProjectConfig::find()`.
 - Added `craft\services\ProjectConfig::flush()`.
 - Added `craft\services\ProjectConfig::writeYamlFiles()`.
+- Added `craft\services\Sites::$maxSites`. ([#14307](https://github.com/craftcms/cms/pull/14307))
+- Added `craft\services\Sites::getRemainingSites()`. ([#14307](https://github.com/craftcms/cms/pull/14307))
 - Added `craft\web\CpScreenResponseBehavior::$actionMenuItems`.
 - Added `craft\web\CpScreenResponseBehavior::$contextMenuItems`.
 - Added `craft\web\CpScreenResponseBehavior::$selectableSites`.
@@ -609,6 +611,7 @@
 - Improved the performance of autosaves for elements with newly-created Matrix entries.
 - Slugs are no longer required for elements that don’t have a URI format that contains `slug`.
 - Garbage collection now deletes orphaned nested entries.
+- Craft now has a default limit of 100 sites, which can be increased via `craft\ervices\Sites::$maxSites` at your own peril. ([#14307](https://github.com/craftcms/cms/pull/14307))
 - Fixed a bug where multi-site element queries weren’t scoring elements on a per-site basis. ([#13801](https://github.com/craftcms/cms/discussions/13801))
 - Fixed an error that could occur if eager-loading aliases conflicted with native eager-loading handles, such as `author`. ([#14057](https://github.com/craftcms/cms/issues/14057))
 - Fixed a bug where layout components provided by disabled plugins weren’t getting omitted. ([#14219](https://github.com/craftcms/cms/pull/14219))

CHANGELOG.md

@@ -5,6 +5,9 @@
 - Improved global sidebar styling. ([#14281](https://github.com/craftcms/cms/pull/14281))
 - The global sidebar is now collapsible. ([#14281](https://github.com/craftcms/cms/pull/14281))
 - Entry cards without a thumbnail now show their entry type icon. ([#14305](https://github.com/craftcms/cms/issues/14305))
+- Craft now has a default limit of 100 sites, which can be increased via `craft\ervices\Sites::$maxSites` at your own peril. ([#14307](https://github.com/craftcms/cms/pull/14307))
+- Added `craft\services\Sites::$maxSites`. ([#14307](https://github.com/craftcms/cms/pull/14307))
+- Added `craft\services\Sites::getRemainingSites()`. ([#14307](https://github.com/craftcms/cms/pull/14307))
 - Added `Craft.ElementEditor::markDeltaNameAsModified()`.
 - Removed `craft\elements\NestedElementManager::$allowDeletion`.
 - Fixed a bug where element editor forms could submit duplicate input values. ([#14276](https://github.com/craftcms/cms/issues/14276))

src/controllers/SitesController.php

@@ -56,7 +56,6 @@ public function beforeAction($action): bool
     public function actionSettingsIndex(?int $groupId = null): Response
     {
         $sitesService = Craft::$app->getSites();
-        $allGroups = $sitesService->getAllGroups();
 
         if ($groupId) {
             if (($group = $sitesService->getGroupById($groupId)) === null) {
@@ -88,9 +87,8 @@ public function actionSettingsIndex(?int $groupId = null): Response
 
         return $this->renderTemplate('settings/sites/index.twig', compact(
             'crumbs',
-            'allGroups',
             'group',
-            'sites'
+            'sites',
         ));
     }
 

src/services/Sites.php

@@ -125,6 +125,19 @@ class Sites extends Component
      */
     public const EVENT_AFTER_DELETE_SITE = 'afterDeleteSite';
 
+    /**
+     * This value can be configured as needed, but exists as a safeguard against performance issues.
+     *
+     * ::: warning
+     * Craft’s multi-site support is not designed to be infinitely scalable.
+     * Increase this limit at your own risk!
+     * :::
+     *
+     * @var int The maximum number of sites that can be created.
+     * @since 5.0.0
+     */
+    public int $maxSites = 100;
+
     /**
      * @var MemoizableArray<SiteGroup>|null
      * @see _groups()
@@ -633,6 +646,18 @@ public function getSiteByHandle(string $siteHandle, ?bool $withDisabled = null):
         return ArrayHelper::firstWhere($this->_allSites($withDisabled), 'handle', $siteHandle, true);
     }
 
+    /**
+     * Returns the number of sites that can be created, based on [[$maxSites]].
+     *
+     * @return int
+     * @see $maxSites
+     * @since 5.0.0
+     */
+    public function getRemainingSites(): int
+    {
+        return max($this->maxSites - count($this->_allSitesById), 0);
+    }
+
     /**
      * Saves a site.
      *
@@ -646,6 +671,10 @@ public function saveSite(Site $site, bool $runValidation = true): bool
     {
         $isNewSite = !$site->id;
 
+        if ($isNewSite && !$this->getRemainingSites()) {
+            throw new Exception("Maximum number of sites cannot exceed $this->maxSites.");
+        }
+
         if (!empty($this->_allSitesById)) {
             $primarySite = $this->getPrimarySite();
         } else {

src/templates/settings/sites/index.twig

@@ -6,16 +6,19 @@
 
 
 {% block actionButton %}
-    {% set newSiteUrl = url('settings/sites/new', (group ? { groupId: group.id } : null)) %}
-    <a href="{{ newSiteUrl }}" class="btn submit add icon">{{ "New site"|t('app') }}</a>
+    {{ tag('a', {
+        href: url('settings/sites/new', (group ? { groupId: group.id } : null)),
+        class:  ['btn', 'submit', 'add', 'icon', craft.app.sites.getRemainingSites() ? null : 'disabled'],
+        text: "New site"|t('app'),
+    }) }}
 {% endblock %}
 
 
 {% block sidebar %}
     <nav>
         <ul id="groups">
             <li><a href="{{ url('settings/sites') }}"{% if not group %} class="sel"{% endif %}>{{ "All Sites"|t('app') }}</a></li>
-            {% for g in allGroups %}
+            {% for g in craft.app.sites.getAllGroups() %}
                 <li>
                     {{ tag('a', {
                         href: url('settings/sites', {groupId: g.id}),