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// Copyright (c) 2009 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.
// StrictTransportSecurityState maintains an in memory database containing the
// list of hosts that currently have strict transport security enabled. This
// singleton object deals with writing that data out to disk as needed and
// loading it at startup.
// At startup we need to load the strict transport security state from the
// disk. For the moment, we don't want to delay startup for this load, so we
// let the StrictTransportSecurityState run for a while without being loaded.
// This means that it's possible for pages opened very quickly not to get the
// correct strict transport security information.
//
// To load the state, we schedule a Task on the file thread which loads,
// deserialises and configures the StrictTransportSecurityState.
//
// The StrictTransportSecurityState object supports running a callback function
// when it changes. This object registers the callback, pointing at itself.
//
// StrictTransportSecurityState calls...
// StrictTransportSecurityPersister::StateIsDirty
// since the callback isn't allowed to block or reenter, we schedule a Task
// on the file thread after some small amount of time
//
// ...
//
// StrictTransportSecurityPersister::SerialiseState
// copies the current state of the StrictTransportSecurityState, serialises
// and writes to disk.
#include "base/file_path.h"
#include "base/lock.h"
#include "base/ref_counted.h"
#include "net/base/strict_transport_security_state.h"
class StrictTransportSecurityPersister :
public base::RefCountedThreadSafe<StrictTransportSecurityPersister>,
public net::StrictTransportSecurityState::Delegate {
public:
StrictTransportSecurityPersister(net::StrictTransportSecurityState* state,
const FilePath& profile_path);
~StrictTransportSecurityPersister();
// Called by the StrictTransportSecurityState when it changes its state.
virtual void StateIsDirty(net::StrictTransportSecurityState*);
private:
// a Task callback for when the state needs to be written out.
void SerialiseState();
// a Task callback for when the state needs to be loaded from disk at startup.
void LoadState();
Lock lock_; // protects all the members
// true when the state object has signaled that we're dirty and we haven't
// serialised the state yet.
bool state_is_dirty_;
scoped_refptr<net::StrictTransportSecurityState>
strict_transport_security_state_;
// The path to the file in which we store the serialised state.
const FilePath state_file_;
};
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