Internal: Add setting to limit number of same e-mails - refs #5112

public/main/auth/inscription.php

@@ -288,6 +288,15 @@
 
     $form->addEmailRule('email');
 
+    $form->addRule(
+        'email',
+        get_lang('This e-mail address has already been used by the maximum number of allowed accounts. Please use another.'),
+        'callback',
+        function ($email) {
+            return !api_email_reached_registration_limit($email);
+        }
+    );
+
     // USERNAME
     if ('true' != api_get_setting('login_is_email')) {
         $form->addText(

public/main/inc/lib/api.lib.php

@@ -7574,3 +7574,21 @@ function api_calculate_increment_percent(int $newValue, int $oldValue): string
     }
     return $result;
 }
+
+/**
+ * @todo Move to UserRegistrationHelper when migrating inscription.php to Symfony
+ */
+function api_email_reached_registration_limit(string $email): bool
+{
+    $limit = (int) api_get_setting('platform.hosting_limit_identical_email');
+
+    if ($limit <= 0 || empty($email)) {
+        return false;
+    }
+
+    $repo = Container::getUserRepository();
+    $count = $repo->countUsersByEmail($email);
+
+    return $count >= $limit;
+}
+

public/main/inc/lib/internationalization.lib.php

@@ -219,6 +219,9 @@ function api_get_timezone(): string
         Session::write('system_timezone', $timezone);
     }
 
+    // Replace backslashes by forward slashes in case of wrong timezone format
+    $timezone = str_replace('\\', '/', $timezone);
+
     return $timezone;
 }
 

src/CoreBundle/DataFixtures/SettingsCurrentFixtures.php

@@ -2012,6 +2012,11 @@ public static function getNewConfigurationSettings(): array
                 ],
             ],
             'platform' => [
+                [
+                    'name' => 'hosting_limit_identical_email',
+                    'title' => 'Limit identical email usage',
+                    'comment' => 'Maximum number of accounts allowed to share the same e-mail address. Set to 0 to disable this limit.',
+                ],
                 [
                     'name' => 'allow_double_validation_in_registration',
                     'title' => 'Double validation for registration process',

src/CoreBundle/Migrations/Schema/V200/Version20250709201100.php

@@ -0,0 +1,87 @@
+<?php
+
+/* For licensing terms, see /license.txt */
+
+declare(strict_types=1);
+
+namespace Chamilo\CoreBundle\Migrations\Schema\V200;
+
+use Chamilo\CoreBundle\Migrations\AbstractMigrationChamilo;
+use Doctrine\DBAL\Schema\Schema;
+
+final class Version20250709201100 extends AbstractMigrationChamilo
+{
+    public function getDescription(): string
+    {
+        return 'Insert or update the platform setting for hosting_limit_identical_email.';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $setting = [
+            'variable' => 'hosting_limit_identical_email',
+            'selected_value' => '0',
+            'title' => 'Limit identical email usage',
+            'comment' => 'Maximum number of accounts allowed to share the same e-mail address. Set to 0 to disable this limit.',
+            'category' => 'platform',
+        ];
+
+        $sqlCheck = sprintf(
+            "SELECT COUNT(*) as count
+             FROM settings
+             WHERE variable = '%s'
+               AND subkey IS NULL
+               AND access_url = 1",
+            addslashes($setting['variable'])
+        );
+
+        $stmt = $this->connection->executeQuery($sqlCheck);
+        $result = $stmt->fetchAssociative();
+
+        if ($result && (int)$result['count'] > 0) {
+            // UPDATE existing setting
+            $this->addSql(sprintf(
+                "UPDATE settings
+                 SET selected_value = '%s',
+                     title = '%s',
+                     comment = '%s',
+                     category = '%s'
+                 WHERE variable = '%s'
+                   AND subkey IS NULL
+                   AND access_url = 1",
+                addslashes($setting['selected_value']),
+                addslashes($setting['title']),
+                addslashes($setting['comment']),
+                addslashes($setting['category']),
+                addslashes($setting['variable'])
+            ));
+            $this->write(sprintf("Updated setting: %s", $setting['variable']));
+        } else {
+            // INSERT new setting
+            $this->addSql(sprintf(
+                "INSERT INTO settings
+                    (variable, subkey, type, category, selected_value, title, comment, access_url_changeable, access_url_locked, access_url)
+                 VALUES
+                    ('%s', NULL, NULL, '%s', '%s', '%s', '%s', 1, 0, 1)",
+                addslashes($setting['variable']),
+                addslashes($setting['category']),
+                addslashes($setting['selected_value']),
+                addslashes($setting['title']),
+                addslashes($setting['comment'])
+            ));
+            $this->write(sprintf("Inserted setting: %s", $setting['variable']));
+        }
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql("
+            DELETE FROM settings
+             WHERE variable = 'hosting_limit_identical_email'
+               AND subkey IS NULL
+               AND access_url = 1
+        ");
+
+        $this->write("Removed setting: hosting_limit_identical_email.");
+    }
+}

src/CoreBundle/Repository/Node/UserRepository.php

@@ -1270,4 +1270,21 @@ public function findUsersForSessionAdmin(
 
         return $qb->getQuery()->getResult();
     }
+
+    /**
+     * Returns the number of users registered with a given email.
+     *
+     * @param string $email
+     *
+     * @return int
+     */
+    public function countUsersByEmail(string $email): int
+    {
+        return (int) $this->createQueryBuilder('u')
+            ->select('COUNT(u.id)')
+            ->where('u.email = :email')
+            ->setParameter('email', $email)
+            ->getQuery()
+            ->getSingleScalarResult();
+    }
 }

src/CoreBundle/Settings/PlatformSettingsSchema.php

@@ -98,6 +98,7 @@ public function buildSettings(AbstractSettingsBuilder $builder): void
                     'show_tabs_per_role' => '{}',
                     'session_admin_user_subscription_search_extra_field_to_search' => '',
                     'push_notification_settings' => '',
+                    'hosting_limit_identical_email' => '0',
                 ]
             )
             ->setTransformer(
@@ -161,6 +162,7 @@ public function buildForm(FormBuilderInterface $builder): void
             ->add('use_custom_pages', YesNoType::class)
             ->add('pdf_logo_header')
             ->add('allow_my_files', YesNoType::class)
+            // old settings with no category
             ->add('chamilo_database_version')
             ->add(
                 'load_term_conditions_section',
@@ -247,7 +249,16 @@ public function buildForm(FormBuilderInterface $builder): void
                     'help' => 'User extra field key to use when searching and naming sessions from /admin-dashboard/register.',
                 ]
             )
-            ->add('push_notification_settings', TextareaType::class);
+            ->add('push_notification_settings', TextareaType::class)
+            ->add(
+                'hosting_limit_identical_email',
+                TextType::class,
+                [
+                    'label' => 'Limit identical emails',
+                    'help' => 'Maximum number of accounts allowed with the same email. Set to 0 to disable limit.'
+                ]
+            )
+        ;
 
         $this->updateFormFieldsFromSettingsInfo($builder);
     }