// 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 "net/ssl/ssl_config_service.h"

#include "base/lazy_instance.h"
#include "base/synchronization/lock.h"
#include "net/ssl/ssl_config_service_defaults.h"

namespace net {

SSLConfigService::SSLConfigService()
    : observer_list_(ObserverList<Observer>::NOTIFY_EXISTING_ONLY) {
}

// GlobalSSLObject holds a reference to a global SSL object, such as the
// CRLSet or the EVCertsWhitelist. It simply wraps a lock  around a
// scoped_refptr so that getting a reference doesn't race with
// updating the global object.
template <class T>
class GlobalSSLObject {
 public:
  void Set(const scoped_refptr<T>& new_ssl_object) {
    base::AutoLock locked(lock_);
    ssl_object_ = new_ssl_object;
  }

  scoped_refptr<T> Get() const {
    base::AutoLock locked(lock_);
    return ssl_object_;
  }

 private:
  scoped_refptr<T> ssl_object_;
  mutable base::Lock lock_;
};

typedef GlobalSSLObject<CRLSet> GlobalCRLSet;
typedef GlobalSSLObject<ct::EVCertsWhitelist> GlobalEVCertsWhitelist;

base::LazyInstance<GlobalCRLSet>::Leaky g_crl_set = LAZY_INSTANCE_INITIALIZER;
base::LazyInstance<GlobalEVCertsWhitelist>::Leaky g_ev_whitelist =
    LAZY_INSTANCE_INITIALIZER;

// static
void SSLConfigService::SetCRLSet(scoped_refptr<CRLSet> crl_set) {
  // Note: this can be called concurently with GetCRLSet().
  g_crl_set.Get().Set(crl_set);
}

// static
scoped_refptr<CRLSet> SSLConfigService::GetCRLSet() {
  return g_crl_set.Get().Get();
}

// static
void SSLConfigService::SetEVCertsWhitelist(
    scoped_refptr<ct::EVCertsWhitelist> ev_whitelist) {
  g_ev_whitelist.Get().Set(ev_whitelist);
}

// static
scoped_refptr<ct::EVCertsWhitelist> SSLConfigService::GetEVCertsWhitelist() {
  return g_ev_whitelist.Get().Get();
}

void SSLConfigService::AddObserver(Observer* observer) {
  observer_list_.AddObserver(observer);
}

void SSLConfigService::RemoveObserver(Observer* observer) {
  observer_list_.RemoveObserver(observer);
}

void SSLConfigService::NotifySSLConfigChange() {
  FOR_EACH_OBSERVER(Observer, observer_list_, OnSSLConfigChanged());
}

bool SSLConfigService::SupportsFastradioPadding(const GURL& url) {
  return false;
}

SSLConfigService::~SSLConfigService() {
}

void SSLConfigService::ProcessConfigUpdate(const SSLConfig& orig_config,
                                           const SSLConfig& new_config) {
  bool config_changed =
      (orig_config.rev_checking_enabled != new_config.rev_checking_enabled) ||
      (orig_config.rev_checking_required_local_anchors !=
       new_config.rev_checking_required_local_anchors) ||
      (orig_config.version_min != new_config.version_min) ||
      (orig_config.version_max != new_config.version_max) ||
      (orig_config.disabled_cipher_suites !=
       new_config.disabled_cipher_suites) ||
      (orig_config.channel_id_enabled != new_config.channel_id_enabled) ||
      (orig_config.false_start_enabled != new_config.false_start_enabled) ||
      (orig_config.require_forward_secrecy !=
       new_config.require_forward_secrecy);

  if (config_changed)
    NotifySSLConfigChange();
}

}  // namespace net