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// 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/extensions/api/push_messaging/push_messaging_invalidation_handler.h"
#include <algorithm>
#include <vector>
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "chrome/browser/extensions/api/push_messaging/push_messaging_invalidation_handler_delegate.h"
#include "components/crx_file/id_util.h"
#include "components/invalidation/invalidation_service.h"
#include "components/invalidation/object_id_invalidation_map.h"
#include "extensions/common/extension.h"
#include "google/cacheinvalidation/types.pb.h"
namespace extensions {
namespace {
const int kNumberOfSubchannels = 4;
// Chrome push messaging object IDs currently have the following format:
// <format type>/<GAIA ID>/<extension ID>/<subchannel>
// <format type> must be 'U', and <GAIA ID> is handled server-side so the client
// never sees it.
syncer::ObjectIdSet ExtensionIdToObjectIds(const std::string& extension_id) {
syncer::ObjectIdSet object_ids;
for (int i = 0; i < kNumberOfSubchannels; ++i) {
std::string name("U/");
name += extension_id;
name += "/";
name += base::IntToString(i);
object_ids.insert(invalidation::ObjectId(
ipc::invalidation::ObjectSource::CHROME_PUSH_MESSAGING,
name));
}
return object_ids;
}
// Returns true iff the conversion was successful.
bool ObjectIdToExtensionAndSubchannel(const invalidation::ObjectId& object_id,
std::string* extension_id,
int* subchannel) {
if (object_id.source() !=
ipc::invalidation::ObjectSource::CHROME_PUSH_MESSAGING) {
DLOG(WARNING) << "Invalid source: " << object_id.source();
return false;
}
const std::string& name = object_id.name();
std::vector<std::string> components;
base::SplitStringDontTrim(name, '/', &components);
if (components.size() < 3) {
DLOG(WARNING) << "Invalid format type from object name " << name;
return false;
}
if (components[0] != "U") {
DLOG(WARNING) << "Invalid format type from object name " << name;
return false;
}
if (!crx_file::id_util::IdIsValid(components[1])) {
DLOG(WARNING) << "Invalid extension ID from object name " << name;
return false;
}
*extension_id = components[1];
if (!base::StringToInt(components[2], subchannel)) {
DLOG(WARNING) << "Subchannel not a number from object name " << name;
return false;
}
if (*subchannel < 0 || *subchannel >= kNumberOfSubchannels) {
DLOG(WARNING) << "Subchannel out of range from object name " << name;
return false;
}
return true;
}
} // namespace
PushMessagingInvalidationHandler::PushMessagingInvalidationHandler(
invalidation::InvalidationService* service,
PushMessagingInvalidationHandlerDelegate* delegate)
: service_(service),
delegate_(delegate) {
DCHECK(service_);
service_->RegisterInvalidationHandler(this);
}
PushMessagingInvalidationHandler::~PushMessagingInvalidationHandler() {
DCHECK(thread_checker_.CalledOnValidThread());
service_->UnregisterInvalidationHandler(this);
}
void PushMessagingInvalidationHandler::SuppressInitialInvalidationsForExtension(
const std::string& extension_id) {
DCHECK(thread_checker_.CalledOnValidThread());
const syncer::ObjectIdSet& suppressed_ids =
ExtensionIdToObjectIds(extension_id);
suppressed_ids_.insert(suppressed_ids.begin(), suppressed_ids.end());
}
void PushMessagingInvalidationHandler::RegisterExtension(
const std::string& extension_id) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(crx_file::id_util::IdIsValid(extension_id));
registered_extensions_.insert(extension_id);
UpdateRegistrations();
}
void PushMessagingInvalidationHandler::UnregisterExtension(
const std::string& extension_id) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(crx_file::id_util::IdIsValid(extension_id));
registered_extensions_.erase(extension_id);
UpdateRegistrations();
}
void PushMessagingInvalidationHandler::OnInvalidatorStateChange(
syncer::InvalidatorState state) {
DCHECK(thread_checker_.CalledOnValidThread());
// Nothing to do.
}
void PushMessagingInvalidationHandler::OnIncomingInvalidation(
const syncer::ObjectIdInvalidationMap& invalidation_map) {
DCHECK(thread_checker_.CalledOnValidThread());
invalidation_map.AcknowledgeAll();
syncer::ObjectIdSet ids = invalidation_map.GetObjectIds();
for (syncer::ObjectIdSet::const_iterator it = ids.begin();
it != ids.end(); ++it) {
const syncer::SingleObjectInvalidationSet& list =
invalidation_map.ForObject(*it);
const syncer::Invalidation& invalidation = list.back();
std::string payload;
if (invalidation.is_unknown_version()) {
payload = std::string();
} else {
payload = list.back().payload();
}
syncer::ObjectIdSet::iterator suppressed_id = suppressed_ids_.find(*it);
if (suppressed_id != suppressed_ids_.end()) {
suppressed_ids_.erase(suppressed_id);
continue;
}
DVLOG(2) << "Incoming push message, id is: "
<< syncer::ObjectIdToString(*it)
<< " and payload is:" << payload;
std::string extension_id;
int subchannel;
if (ObjectIdToExtensionAndSubchannel(*it, &extension_id, &subchannel)) {
const syncer::SingleObjectInvalidationSet& invalidation_list =
invalidation_map.ForObject(*it);
// We always forward unknown version invalidation when we receive one.
if (invalidation_list.StartsWithUnknownVersion()) {
DVLOG(2) << "Sending push message to receiver, extension is "
<< extension_id << ", subchannel is " << subchannel
<< "and payload was lost";
delegate_->OnMessage(extension_id, subchannel, std::string());
}
// If we receive a new max version for this object, forward its payload.
const syncer::Invalidation& max_invalidation = invalidation_list.back();
if (!max_invalidation.is_unknown_version() &&
max_invalidation.version() > max_object_version_map_[*it]) {
max_object_version_map_[*it] = max_invalidation.version();
DVLOG(2) << "Sending push message to receiver, extension is "
<< extension_id << ", subchannel is " << subchannel
<< ", and payload is " << max_invalidation.payload();
delegate_->OnMessage(extension_id,
subchannel,
max_invalidation.payload());
}
}
}
}
std::string PushMessagingInvalidationHandler::GetOwnerName() const {
return "PushMessagingApi";
}
void PushMessagingInvalidationHandler::UpdateRegistrations() {
syncer::ObjectIdSet ids;
for (std::set<std::string>::const_iterator it =
registered_extensions_.begin(); it != registered_extensions_.end();
++it) {
const syncer::ObjectIdSet& object_ids = ExtensionIdToObjectIds(*it);
ids.insert(object_ids.begin(), object_ids.end());
}
service_->UpdateRegisteredInvalidationIds(this, ids);
}
} // namespace extensions
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