Ticket #43148: 43148.1.diff

src/wp-includes/ms-functions.php

@@ -497 +497 @@
 
         $limited_email_domains = get_site_option( 'limited_email_domains' );
         if ( is_array( $limited_email_domains ) && ! empty( $limited_email_domains ) ) {
-                $emaildomain = substr( $user_email, 1 + strpos( $user_email, '@' ) );
-                if ( ! in_array( $emaildomain, $limited_email_domains ) ) {
+                $allowed_domains = array_map( 'strtolower', $limited_email_domains );
+                $emaildomain = strtolower( substr( $user_email, 1 + strpos( $user_email, '@' ) ) );
+                if ( ! in_array( $emaildomain, $allowed_domains, true ) ) {
                         $errors->add( 'user_email', __( 'Sorry, that email address is not allowed!' ) );
                 }
         }

tests/phpunit/tests/multisite/wpmuValidateUserSignup.php

@@ -62 +62 @@
                         $this->assertContains( 'user_email', $v['errors']->get_error_codes() );
                 }
 
+                public function test_should_not_fail_for_emails_from_whitelisted_domains_with_mixed_case() {
+                        $domains = array( 'foo.com', 'bar.org' );
+                        update_site_option( 'limited_email_domains', $domains );
+
+                        $v = wpmu_validate_user_signup( 'foo123', 'foo@BAR.org' );
+                        $this->assertNotContains( 'user_email', $v['errors']->get_error_codes() );
+                }
+
                 public function test_should_fail_for_existing_user_name() {
                         $u = self::factory()->user->create( array( 'user_login' => 'foo123' ) );
                         $v = wpmu_validate_user_signup( 'foo123', 'foo@example.com' );