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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 //
5 
6 #include "chrome/browser/sync/engine/verify_updates_command.h"
7 
8 #include "chrome/browser/sync/engine/syncer.h"
9 #include "chrome/browser/sync/engine/syncer_proto_util.h"
10 #include "chrome/browser/sync/engine/syncer_types.h"
11 #include "chrome/browser/sync/engine/syncer_util.h"
12 #include "chrome/browser/sync/engine/syncproto.h"
13 #include "chrome/browser/sync/protocol/bookmark_specifics.pb.h"
14 #include "chrome/browser/sync/syncable/directory_manager.h"
15 #include "chrome/browser/sync/syncable/syncable.h"
16 
17 namespace browser_sync {
18 
19 using syncable::ScopedDirLookup;
20 using syncable::SyncName;
21 using syncable::WriteTransaction;
22 
23 using syncable::GET_BY_ID;
24 using syncable::SYNCER;
25 
VerifyUpdatesCommand()26 VerifyUpdatesCommand::VerifyUpdatesCommand() {}
~VerifyUpdatesCommand()27 VerifyUpdatesCommand::~VerifyUpdatesCommand() {}
28 
ModelChangingExecuteImpl(sessions::SyncSession * session)29 void VerifyUpdatesCommand::ModelChangingExecuteImpl(
30     sessions::SyncSession* session) {
31   VLOG(1) << "Beginning Update Verification";
32   ScopedDirLookup dir(session->context()->directory_manager(),
33                       session->context()->account_name());
34   if (!dir.good()) {
35     LOG(ERROR) << "Scoped dir lookup failed!";
36     return;
37   }
38   WriteTransaction trans(dir, SYNCER, __FILE__, __LINE__);
39   sessions::StatusController* status = session->status_controller();
40   const GetUpdatesResponse& updates = status->updates_response().get_updates();
41   int update_count = updates.entries().size();
42 
43   VLOG(1) << update_count << " entries to verify";
44   for (int i = 0; i < update_count; i++) {
45     const SyncEntity& update =
46         *reinterpret_cast<const SyncEntity *>(&(updates.entries(i)));
47     ModelSafeGroup g = GetGroupForModelType(update.GetModelType(),
48                                             session->routing_info());
49     if (g != status->group_restriction())
50       continue;
51 
52     VerifyUpdateResult result = VerifyUpdate(&trans, update,
53                                              session->routing_info());
54     status->mutable_update_progress()->AddVerifyResult(result.value, update);
55     status->increment_num_updates_downloaded_by(1);
56     if (update.deleted())
57       status->increment_num_tombstone_updates_downloaded_by(1);
58   }
59 }
60 
61 namespace {
62 // In the event that IDs match, but tags differ AttemptReuniteClient tag
63 // will have refused to unify the update.
64 // We should not attempt to apply it at all since it violates consistency
65 // rules.
VerifyTagConsistency(const SyncEntity & entry,const syncable::MutableEntry & same_id)66 VerifyResult VerifyTagConsistency(const SyncEntity& entry,
67                                   const syncable::MutableEntry& same_id) {
68   if (entry.has_client_defined_unique_tag() &&
69       entry.client_defined_unique_tag() !=
70           same_id.Get(syncable::UNIQUE_CLIENT_TAG)) {
71     return VERIFY_FAIL;
72   }
73   return VERIFY_UNDECIDED;
74 }
75 }  // namespace
76 
VerifyUpdate(syncable::WriteTransaction * trans,const SyncEntity & entry,const ModelSafeRoutingInfo & routes)77 VerifyUpdatesCommand::VerifyUpdateResult VerifyUpdatesCommand::VerifyUpdate(
78     syncable::WriteTransaction* trans, const SyncEntity& entry,
79     const ModelSafeRoutingInfo& routes) {
80   syncable::Id id = entry.id();
81   VerifyUpdateResult result = {VERIFY_FAIL, GROUP_PASSIVE};
82 
83   const bool deleted = entry.has_deleted() && entry.deleted();
84   const bool is_directory = entry.IsFolder();
85   const syncable::ModelType model_type = entry.GetModelType();
86 
87   if (!id.ServerKnows()) {
88     LOG(ERROR) << "Illegal negative id in received updates";
89     return result;
90   }
91   {
92     const std::string name = SyncerProtoUtil::NameFromSyncEntity(entry);
93     if (name.empty() && !deleted) {
94       LOG(ERROR) << "Zero length name in non-deleted update";
95       return result;
96     }
97   }
98 
99   syncable::MutableEntry same_id(trans, GET_BY_ID, id);
100   result.value = SyncerUtil::VerifyNewEntry(entry, &same_id, deleted);
101 
102   syncable::ModelType placement_type = !deleted ? entry.GetModelType()
103       : same_id.good() ? same_id.GetModelType() : syncable::UNSPECIFIED;
104   result.placement = GetGroupForModelType(placement_type, routes);
105 
106   if (VERIFY_UNDECIDED == result.value) {
107     result.value = VerifyTagConsistency(entry, same_id);
108   }
109 
110   if (VERIFY_UNDECIDED == result.value) {
111     if (deleted)
112       result.value = VERIFY_SUCCESS;
113   }
114 
115   // If we have an existing entry, we check here for updates that break
116   // consistency rules.
117   if (VERIFY_UNDECIDED == result.value) {
118     result.value = SyncerUtil::VerifyUpdateConsistency(trans, entry, &same_id,
119         deleted, is_directory, model_type);
120   }
121 
122   if (VERIFY_UNDECIDED == result.value)
123     result.value = VERIFY_SUCCESS;  // No news is good news.
124 
125   return result;  // This might be VERIFY_SUCCESS as well
126 }
127 
128 }  // namespace browser_sync
129