Fix bug where cache keys could exceed length limit specified in db schema (#7004)

CHANGELOG

@@ -3,6 +3,7 @@ CHANGELOG Roundcube Webmail
 
 - Managesieve: Fix locked UI after opening filter frame (#7007)
 - Fix PHP warning: "array_merge(): Expected parameter 2 to be an array, null given in sendmail.inc (#7003)
+- Fix bug where cache keys could exceed length limit specified in db schema (#7004)
 
 RELEASE 1.4.0
 -------------

program/lib/Roundcube/rcube_cache.php

@@ -156,7 +156,7 @@ class rcube_cache
      * @param boolean $prefix_mode Enable it to clear all keys starting
      *                             with prefix specified in $key
      */
-    public function remove($key=null, $prefix_mode=false)
+    public function remove($key = null, $prefix_mode = false)
     {
         // Remove all keys
         if ($key === null) {
@@ -232,6 +232,33 @@ class rcube_cache
         $this->cache_changes = array();
     }
 
+    /**
+     * A helper to build cache key for specified parameters.
+     *
+     * @param string $prefix Key prefix (Max. length 64 characters)
+     * @param array  $params Additional parameters
+     *
+     * @return string Key name
+     */
+    public static function key_name($prefix, $params = array())
+    {
+        $cache_key = $prefix;
+
+        if (!empty($params)) {
+            $func   = function($v) {
+                if (is_array($v)) {
+                    sort($v);
+                }
+                return is_string($v) ? $v : serialize($v);
+            };
+
+            $params = array_map($func, $params);
+            $cache_key .= '.' . md5(implode(':', $params));
+        }
+
+        return $cache_key;
+    }
+
     /**
      * Reads cache entry.
      *

program/lib/Roundcube/rcube_imap.php

@@ -2859,14 +2859,9 @@ class rcube_imap extends rcube_storage
      *
      * @return  array   List of folders
      */
-    public function list_folders_subscribed($root='', $name='*', $filter=null, $rights=null, $skip_sort=false)
+    public function list_folders_subscribed($root = '', $name = '*', $filter = null, $rights = null, $skip_sort = false)
     {
-        $cache_key = $root.':'.$name;
-        if (!empty($filter)) {
-            $cache_key .= ':'.(is_string($filter) ? $filter : serialize($filter));
-        }
-        $cache_key .= ':'.$rights;
-        $cache_key = 'mailboxes.'.md5($cache_key);
+        $cache_key = rcube_cache::key_name('mailboxes', array($root, $name, $filter, $rights));
 
         // get cached folder list
         $a_mboxes = $this->get_cache($cache_key);
@@ -2996,14 +2991,9 @@ class rcube_imap extends rcube_storage
      *
      * @return array Indexed array with folder names
      */
-    public function list_folders($root='', $name='*', $filter=null, $rights=null, $skip_sort=false)
+    public function list_folders($root = '', $name = '*', $filter = null, $rights = null, $skip_sort = false)
     {
-        $cache_key = $root.':'.$name;
-        if (!empty($filter)) {
-            $cache_key .= ':'.(is_string($filter) ? $filter : serialize($filter));
-        }
-        $cache_key .= ':'.$rights;
-        $cache_key = 'mailboxes.list.'.md5($cache_key);
+        $cache_key = rcube_cache::key_name('mailboxes.list', array($root, $name, $filter, $rights));
 
         // get cached folder list
         $a_mboxes = $this->get_cache($cache_key);
@@ -3716,7 +3706,7 @@ class rcube_imap extends rcube_storage
         }
 
         // get cached metadata
-        $cache_key = 'mailboxes.folder-info.' . $folder;
+        $cache_key = rcube_cache::key_name('mailboxes.folder-info', array($folder));
         $cached    = $this->get_cache($cache_key);
 
         if (is_array($cached)) {
@@ -3886,7 +3876,7 @@ class rcube_imap extends rcube_storage
             return false;
         }
 
-        $this->clear_cache('mailboxes.folder-info.' . $folder);
+        $this->clear_cache(rcube_cache::key_name('mailboxes.folder-info', array($folder)));
 
         return $this->conn->setACL($folder, $user, $acl);
     }
@@ -4063,13 +4053,7 @@ class rcube_imap extends rcube_storage
         $entries = (array) $entries;
 
         if (!$force) {
-            // create cache key
-            // @TODO: this is the simplest solution, but we do the same with folders list
-            //        maybe we should store data per-entry and merge on request
-            sort($options);
-            sort($entries);
-            $cache_key = 'mailboxes.metadata.' . $folder;
-            $cache_key .= '.' . md5(serialize($options).serialize($entries));
+            $cache_key = rcube_cache::key_name('mailboxes.metadata', array($folder, $options, $entries));
 
             // get cached data
             $cached_data = $this->get_cache($cache_key);

program/lib/Roundcube/rcube_ldap.php

@@ -339,7 +339,7 @@ class rcube_ldap extends rcube_addressbook
                     $search_base_dn = strtr($conf['search_base_dn'], $replaces);
                     $search_filter  = strtr($conf['search_filter'], $replaces);
 
-                    $cache_key = 'DN.' . md5("$host:$search_bind_dn:$search_base_dn:$search_filter:" . $conf['search_bind_pw']);
+                    $cache_key = rcube_cache::key_name('DN', array($host, $search_bind_dn, $search_base_dn, $search_filter, $conf['search_bind_pw']));
 
                     if ($this->cache && ($dn = $this->cache->get($cache_key))) {
                         $replaces['%dn'] = $dn;