Bring back legacy ldap mailbox search for old sogo

src/ldap.js

@@ -284,6 +284,40 @@ function mailboxSearch(req, res, next) {
                 res.end();
             }
         });
+    } else if (req.dn.rdns[0].attrs.domain) {
+        var domain = req.dn.rdns[0].attrs.domain.value.toLowerCase();
+
+        mailboxdb.listMailboxes(domain, 1, 1000, function (error, result) {
+
+            if (error) return next(new ldap.OperationsError(error.toString()));
+
+            var results = [];
+
+            // send mailbox objects
+            result.forEach(function (mailbox) {
+                var dn = ldap.parseDN(`cn=${mailbox.name}@${domain},domain=${domain},ou=mailboxes,dc=cloudron`);
+
+                var obj = {
+                    dn: dn.toString(),
+                    attributes: {
+                        objectclass: ['mailbox'],
+                        objectcategory: 'mailbox',
+                        cn: `${mailbox.name}@${domain}`,
+                        uid: `${mailbox.name}@${domain}`,
+                        mail: `${mailbox.name}@${domain}`
+                    }
+                };
+
+                // ensure all filter values are also lowercase
+                var lowerCaseFilter = safe(function () { return ldap.parseFilter(req.filter.toString().toLowerCase()); }, null);
+                if (!lowerCaseFilter) return next(new ldap.OperationsError(safe.error.toString()));
+                if ((req.dn.equals(dn) || req.dn.parentOf(dn)) && lowerCaseFilter.matches(obj.attributes)) {
+                    results.push(obj);
+                }
+            });
+
+            finalSend(results, req, res, next);
+        });
     } else {
         mailboxdb.listAllMailboxes(1, 1000, function (error, mailboxes) {
             if (error) return next(new ldap.OperationsError(error.toString()));