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// Copyright 2015 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 "components/gcm_driver/instance_id/instance_id_impl.h"
#include <algorithm>
#include "base/base64.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_number_conversions.h"
#include "components/gcm_driver/gcm_driver_desktop.h"
#include "crypto/random.h"
namespace instance_id {
// static
InstanceID* InstanceID::Create(const std::string& app_id,
gcm::GCMDriver* gcm_driver) {
return new InstanceIDImpl(app_id, gcm_driver);
}
InstanceIDImpl::InstanceIDImpl(const std::string& app_id,
gcm::GCMDriver* gcm_driver)
: InstanceID(app_id),
gcm_driver_(gcm_driver),
load_from_store_(false),
weak_ptr_factory_(this) {
gcm_driver_->GetInstanceIDStore()->GetInstanceIDData(
app_id,
base::Bind(&InstanceIDImpl::GetInstanceIDDataCompleted,
weak_ptr_factory_.GetWeakPtr()));
}
InstanceIDImpl::~InstanceIDImpl() {
}
void InstanceIDImpl::GetID(const GetIDCallback& callback) {
if (!delayed_task_controller_.CanRunTaskWithoutDelay()) {
delayed_task_controller_.AddTask(
base::Bind(&InstanceIDImpl::DoGetID,
weak_ptr_factory_.GetWeakPtr(),
callback));
return;
}
DoGetID(callback);
}
void InstanceIDImpl::DoGetID(const GetIDCallback& callback) {
EnsureIDGenerated();
callback.Run(id_);
}
void InstanceIDImpl::GetCreationTime(const GetCreationTimeCallback& callback) {
if (!delayed_task_controller_.CanRunTaskWithoutDelay()) {
delayed_task_controller_.AddTask(
base::Bind(&InstanceIDImpl::DoGetCreationTime,
weak_ptr_factory_.GetWeakPtr(),
callback));
return;
}
DoGetCreationTime(callback);
}
void InstanceIDImpl::DoGetCreationTime(
const GetCreationTimeCallback& callback) {
callback.Run(creation_time_);
}
void InstanceIDImpl::GetToken(
const std::string& authorized_entity,
const std::string& scope,
const std::map<std::string, std::string>& options,
const GetTokenCallback& callback) {
NOTIMPLEMENTED();
}
void InstanceIDImpl::DeleteToken(const std::string& authorized_entity,
const std::string& scope,
const DeleteTokenCallback& callback) {
NOTIMPLEMENTED();
}
void InstanceIDImpl::DeleteID(const DeleteIDCallback& callback) {
gcm_driver_->GetInstanceIDStore()->RemoveInstanceIDData(app_id());
id_.clear();
creation_time_ = base::Time();
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(callback, InstanceID::SUCCESS));
}
void InstanceIDImpl::GetInstanceIDDataCompleted(
const std::string& instance_id_data) {
Deserialize(instance_id_data);
delayed_task_controller_.SetReady();
}
void InstanceIDImpl::EnsureIDGenerated() {
if (!id_.empty())
return;
// Now produce the ID in the following steps:
// 1) Generates the random number in 8 bytes which is required by the server.
// We don't want to be strictly cryptographically secure. The server might
// reject the ID if there is a conflict or problem.
uint8 bytes[kInstanceIDByteLength];
crypto::RandBytes(bytes, sizeof(bytes));
// 2) Transforms the first 4 bits to 0x7. Note that this is required by the
// server.
bytes[0] &= 0x0f;
bytes[0] |= 0x70;
// 3) Encode the value in Android-compatible base64 scheme:
// * URL safe: '/' replaced by '_' and '+' replaced by '-'.
// * No padding: any trailing '=' will be removed.
base::Base64Encode(
base::StringPiece(reinterpret_cast<const char*>(bytes), sizeof(bytes)),
&id_);
std::replace(id_.begin(), id_.end(), '+', '-');
std::replace(id_.begin(), id_.end(), '/', '_');
id_.erase(std::remove(id_.begin(), id_.end(), '='), id_.end());
creation_time_ = base::Time::Now();
// Save to the persistent store.
gcm_driver_->GetInstanceIDStore()->AddInstanceIDData(
app_id(), SerializeAsString());
}
std::string InstanceIDImpl::SerializeAsString() const {
std::string serialized_data;
serialized_data += id_;
serialized_data += ",";
serialized_data += base::Int64ToString(creation_time_.ToInternalValue());
return serialized_data;
}
void InstanceIDImpl::Deserialize(const std::string& serialized_data) {
if (serialized_data.empty())
return;
std::size_t pos = serialized_data.find(',');
if (pos == std::string::npos) {
DVLOG(1) << "Failed to deserialize the InstanceID data: " + serialized_data;
return;
}
id_ = serialized_data.substr(0, pos);
int64 time_internal = 0LL;
if (!base::StringToInt64(serialized_data.substr(pos + 1), &time_internal)) {
DVLOG(1) << "Failed to deserialize the InstanceID data: " + serialized_data;
return;
}
creation_time_ = base::Time::FromInternalValue(time_internal);
}
} // namespace instance_id
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