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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.
#ifndef REMOTING_HOST_POLICY_HACK_POLICY_WATCHER_H_
#define REMOTING_HOST_POLICY_HACK_POLICY_WATCHER_H_
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/values.h"
namespace base {
class SingleThreadTaskRunner;
class TimeDelta;
class WaitableEvent;
} // namespace base
namespace remoting {
namespace policy_hack {
// Watches for changes to the managed remote access host policies.
// If StartWatching() has been called, then before this object can be deleted,
// StopWatching() have completed (the provided |done| event must be signaled).
class PolicyWatcher {
public:
// Called first with all policies, and subsequently with any changed policies.
typedef base::Callback<void(scoped_ptr<base::DictionaryValue>)>
PolicyCallback;
explicit PolicyWatcher(
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
virtual ~PolicyWatcher();
// This guarantees that the |policy_callback| is called at least once with
// the current policies. After that, |policy_callback| will be called
// whenever a change to any policy is detected. It will then be called only
// with the changed policies.
virtual void StartWatching(const PolicyCallback& policy_callback);
// Should be called after StartWatching() before the object is deleted. Calls
// just wait for |done| to be signaled before deleting the object.
virtual void StopWatching(base::WaitableEvent* done);
// Implemented by each platform. This message loop should be an IO message
// loop.
static PolicyWatcher* Create(
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
// The name of the NAT traversal policy.
static const char kNatPolicyName[];
// The name of the policy for requiring 2-factor authentication.
static const char kHostRequireTwoFactorPolicyName[];
// The name of the host domain policy.
static const char kHostDomainPolicyName[];
// The name of the username policy. This policy is ignored on Windows.
// This policy is currently considered 'internal only' and so is not
// documented in policy_templates.json.
static const char kHostMatchUsernamePolicyName[];
// The name of the policy that controls the host talkgadget prefix.
static const char kHostTalkGadgetPrefixPolicyName[];
// The name of the policy for requiring curtain-mode.
static const char kHostRequireCurtainPolicyName[];
// The names of the policies for token authentication URLs.
static const char kHostTokenUrlPolicyName[];
static const char kHostTokenValidationUrlPolicyName[];
static const char kHostTokenValidationCertIssuerPolicyName[];
// The name of the policy for disabling PIN-less authentication.
static const char kHostAllowClientPairing[];
// The name of the policy for disabling gnubbyd forwarding.
static const char kHostAllowGnubbyAuthPolicyName[];
// The name of the policy for overriding policies, for use in testing.
static const char kHostDebugOverridePoliciesName[];
protected:
virtual void StartWatchingInternal() = 0;
virtual void StopWatchingInternal() = 0;
virtual void Reload() = 0;
// Used to check if the class is on the right thread.
bool OnPolicyWatcherThread() const;
// Takes the policy dictionary from the OS specific store and extracts the
// relevant policies.
void UpdatePolicies(const base::DictionaryValue* new_policy);
// Used for time-based reloads in case something goes wrong with the
// notification system.
void ScheduleFallbackReloadTask();
void ScheduleReloadTask(const base::TimeDelta& delay);
// Returns a DictionaryValue containing the default values for each policy.
const base::DictionaryValue& Defaults() const;
private:
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
PolicyCallback policy_callback_;
scoped_ptr<base::DictionaryValue> old_policies_;
scoped_ptr<base::DictionaryValue> default_values_;
scoped_ptr<base::DictionaryValue> bad_type_values_;
// Allows us to cancel any inflight FileWatcher events or scheduled reloads.
base::WeakPtrFactory<PolicyWatcher> weak_factory_;
};
} // namespace policy_hack
} // namespace remoting
#endif // REMOTING_HOST_POLICY_HACK_POLICY_WATCHER_H_
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