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// Copyright (c) 2011 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.
// Most of this code is copied from:
// src/chrome/browser/policy/asynchronous_policy_loader.{h,cc}
#include "remoting/host/plugin/policy_hack/nat_policy.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/location.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop_proxy.h"
#include "base/synchronization/waitable_event.h"
#include "base/time.h"
#include "base/values.h"
namespace remoting {
namespace policy_hack {
namespace {
// The time interval for rechecking policy. This is our fallback in case the
// delegate never reports a change to the ReloadObserver.
const int kFallbackReloadDelayMinutes = 15;
} // namespace
const char NatPolicy::kNatPolicyName[] = "RemoteAccessHostFirewallTraversal";
NatPolicy::NatPolicy(base::MessageLoopProxy* message_loop_proxy)
: message_loop_proxy_(message_loop_proxy),
current_nat_enabled_state_(false),
first_state_published_(false),
ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
}
NatPolicy::~NatPolicy() {
}
void NatPolicy::StartWatching(const NatEnabledCallback& nat_enabled_cb) {
if (!OnPolicyThread()) {
message_loop_proxy_->PostTask(FROM_HERE,
base::Bind(&NatPolicy::StartWatching,
base::Unretained(this),
nat_enabled_cb));
return;
}
nat_enabled_cb_ = nat_enabled_cb;
StartWatchingInternal();
}
void NatPolicy::StopWatching(base::WaitableEvent* done) {
if (!OnPolicyThread()) {
message_loop_proxy_->PostTask(FROM_HERE,
base::Bind(&NatPolicy::StopWatching,
base::Unretained(this), done));
return;
}
StopWatchingInternal();
weak_factory_.InvalidateWeakPtrs();
nat_enabled_cb_.Reset();
done->Signal();
}
void NatPolicy::ScheduleFallbackReloadTask() {
DCHECK(OnPolicyThread());
ScheduleReloadTask(
base::TimeDelta::FromMinutes(kFallbackReloadDelayMinutes));
}
void NatPolicy::ScheduleReloadTask(const base::TimeDelta& delay) {
DCHECK(OnPolicyThread());
message_loop_proxy_->PostDelayedTask(
FROM_HERE,
base::Bind(&NatPolicy::Reload, weak_factory_.GetWeakPtr()),
delay.InMilliseconds());
}
bool NatPolicy::OnPolicyThread() const {
return message_loop_proxy_->BelongsToCurrentThread();
}
void NatPolicy::UpdateNatPolicy(base::DictionaryValue* new_policy) {
DCHECK(OnPolicyThread());
bool new_nat_enabled_state = false;
if (!new_policy->HasKey(kNatPolicyName)) {
// If unspecified, the default value of this policy is true.
//
// TODO(dmaclach): Currently defaults to false on Mac and Linux until we
// have polices in place on those platforms.
#if defined(OS_WIN)
new_nat_enabled_state = true;
#elif defined(OS_MACOSX)
new_nat_enabled_state = false;
#elif defined(OS_LINUX)
new_nat_enabled_state = false;
#else
// Be conservative for now
new_nat_enabled_state = false;
#endif // defined(OS_WIN)
} else {
// Otherwise, try to parse the value and only change from false if we get
// a successful read.
base::Value* value;
if (new_policy->Get(kNatPolicyName, &value) &&
value->IsType(base::Value::TYPE_BOOLEAN)) {
CHECK(value->GetAsBoolean(&new_nat_enabled_state));
}
}
if (!first_state_published_ ||
(new_nat_enabled_state != current_nat_enabled_state_)) {
first_state_published_ = true;
current_nat_enabled_state_ = new_nat_enabled_state;
nat_enabled_cb_.Run(current_nat_enabled_state_);
}
}
} // namespace policy_hack
} // namespace remoting
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