Ticket #1626: wp_check_nicename.diff

wp-login.php

@@ -212 +212 @@
                 require_once( ABSPATH . WPINC . '/registration.php');
 
                 $user_login = sanitize_user( $_POST['user_login'] );
+                $user_nicename = sanitize_title( $user_login );
                 $user_email = apply_filters( 'user_registration_email', $_POST['user_email'] ); 
 
                 // Check the username
@@ -220 +221 @@
                 elseif ( !validate_username( $user_login ) ) {
                         $errors['user_login'] = __('<strong>ERROR</strong>: This username is invalid.  Please enter a valid username.');
                         $user_login = '';
-                } elseif ( username_exists( $user_login ) )
+                } elseif ( username_exists( $user_login ) || nicename_exists( $user_nicename ) ) {
                         $errors['user_login'] = __('<strong>ERROR</strong>: This username is already registered, please choose another one.');
+                }
 
                 // Check the e-mail address
                 if ($user_email == '') {

wp-includes/pluggable.php

@@ -149 +149 @@
 
         wp_cache_add($user->ID, $user, 'users');
         wp_cache_add($user->user_login, $user->ID, 'userlogins');
+        wp_cache_add($user->user_nicename, $user->ID, 'usernicenames');
         return $user;
 
 }
 endif;
 
+if ( !function_exists('get_userdatabynicename') ) :
+function get_userdatabynicename($user_nicename) {
+        global $wpdb;
+        $user_nicename = sanitize_title( $user_nicename );
+
+        $user_id = wp_cache_get($user_nicename, 'usernicenames');
+        $userdata = wp_cache_get($user_id, 'users');
+
+        if ( $data )
+                return $user;
+
+        if ( empty( $user_nicename ) )
+                return false;
+
+        if ( !$user = $wpdb->get_row("SELECT * FROM $wpdb->users WHERE user_nicename = '$user_nicename'") )
+                return false;
+
+        $wpdb->hide_errors();
+        $metavalues = $wpdb->get_results("SELECT meta_key, meta_value FROM $wpdb->usermeta WHERE user_id = '$user->ID'");
+        $wpdb->show_errors();
+
+        if ($metavalues) {
+                foreach ( $metavalues as $meta ) {
+                        $value = maybe_unserialize($meta->meta_value);
+                        $user->{$meta->meta_key} = $value;
+
+                        // We need to set user_level from meta, not row
+                        if ( $wpdb->prefix . 'user_level' == $meta->meta_key )
+                                $user->user_level = $meta->meta_value;
+                }
+        }
+
+        // For backwards compat.
+        if ( isset($user->first_name) )
+                $user->user_firstname = $user->first_name;
+        if ( isset($user->last_name) )
+                $user->user_lastname = $user->last_name;
+        if ( isset($user->description) )
+                $user->user_description = $user->description;
+
+        wp_cache_add($user->ID, $user, 'users');
+        wp_cache_add($user->user_login, $user->ID, 'userlogins');
+        wp_cache_add($user->user_nicename, $user->ID, 'usernicenames');
+        return $user;
+
+}
+endif;
+
 if ( !function_exists('wp_mail') ) :
 function wp_mail($to, $subject, $message, $headers = '') {
         if( $headers == '' ) {

wp-includes/registration.php

@@ -11 +11 @@
 }
 
 
+function nicename_exists( $nicename ) {
+        global $wpdb;
+        $nicename = sanitize_title( $nicename );
+        $user = get_userdatabynicename( $nicename );
+        if ( $user )
+                return $user->ID;
+
+        return null;
+}
+
+
 function email_exists( $email ) {
         global $wpdb;
         $email = addslashes( $email );
@@ -181 +192 @@
         return wp_create_user($username, $password, $email);
 }
 
-?>
- No newline at end of file
+?>