[Sync] Add SyncEncryptionHandler

chrome/browser/sync/glue/nigori_change_processor.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/sync/glue/nigori_change_processor.h"
+
+#include "base/tracked_objects.h"
+#include "sync/internal_api/public/read_node.h"
+#include "sync/internal_api/public/read_transaction.h"
+#include "sync/internal_api/public/sync_encryption_handler.h"
+#include "sync/internal_api/public/user_share.h"
+#include "sync/internal_api/public/util/experiments.h"
+#include "sync/protocol/nigori_specifics.pb.h"
+
+namespace browser_sync {
+
+namespace {
+// The maximum number of times we will automatically overwrite the nigori node
+// because the encryption keys don't match (per chrome instantiation).
+static const int kNigoriOverwriteLimit = 10;
+}
+
+NigoriChangeProcessor::NigoriChangeProcessor(
+    syncer::SyncEncryptionHandler* encryption_handler)
+    : user_share_(NULL),
+      encryption_handler_(encryption_handler) {
+}
+NigoriChangeProcessor::~NigoriChangeProcessor() {}
+
+void NigoriChangeProcessor::AssociateModels(syncer::UserShare* user_share) {
+  user_share_ = user_share;
+  encryption_handler_->ReloadNigori();
+}
+
+void NigoriChangeProcessor::DisassociateModels() {
+  user_share_ = NULL;
+  encryption_handler_ = NULL;
+}
+
+bool NigoriChangeProcessor::ReceivedExperiments(
+    syncer::Experiments* experiments) {
+  if (!user_share_)
+    return false;  // Tests may not have user shares.
+  syncer::ReadTransaction trans(FROM_HERE, user_share_);
+  syncer::ReadNode node(&trans);
+  if (node.InitByTagLookup(syncer::kNigoriTag) != syncer::BaseNode::INIT_OK) {
+    DVLOG(1) << "Couldn't find Nigori node.";
+    return false;
+  }
+  bool found_experiment = false;
+  if (node.GetNigoriSpecifics().sync_tab_favicons()) {
+    experiments->sync_tab_favicons = true;
+    found_experiment = true;
+  }
+  return found_experiment;
+}
+
+}  // namespace browser_sync