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// Copyright (c) 2010 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 "chrome/browser/net/pref_proxy_config_service.h"
#include "chrome/browser/browser_thread.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/prefs/pref_set_observer.h"
#include "chrome/common/notification_details.h"
#include "chrome/common/notification_source.h"
#include "chrome/common/notification_type.h"
#include "chrome/common/pref_names.h"
PrefProxyConfigTracker::PrefProxyConfigTracker(PrefService* pref_service)
: pref_service_(pref_service) {
valid_ = ReadPrefConfig(&pref_config_);
proxy_prefs_observer_.reset(
PrefSetObserver::CreateProxyPrefSetObserver(pref_service_, this));
}
PrefProxyConfigTracker::~PrefProxyConfigTracker() {
DCHECK(pref_service_ == NULL);
}
bool PrefProxyConfigTracker::GetProxyConfig(net::ProxyConfig* config) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (valid_)
*config = pref_config_;
return valid_;
}
void PrefProxyConfigTracker::DetachFromPrefService() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// Stop notifications.
proxy_prefs_observer_.reset();
pref_service_ = NULL;
}
void PrefProxyConfigTracker::AddObserver(
PrefProxyConfigTracker::ObserverInterface* observer) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
observers_.AddObserver(observer);
}
void PrefProxyConfigTracker::RemoveObserver(
PrefProxyConfigTracker::ObserverInterface* observer) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
observers_.RemoveObserver(observer);
}
void PrefProxyConfigTracker::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (type == NotificationType::PREF_CHANGED &&
Source<PrefService>(source).ptr() == pref_service_) {
net::ProxyConfig new_config;
bool valid = ReadPrefConfig(&new_config);
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
NewRunnableMethod(this,
&PrefProxyConfigTracker::InstallProxyConfig,
new_config, valid));
} else {
NOTREACHED() << "Unexpected notification of type " << type.value;
}
}
void PrefProxyConfigTracker::InstallProxyConfig(const net::ProxyConfig& config,
bool valid) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (valid_ != valid || !pref_config_.Equals(config)) {
valid_ = valid;
if (valid_)
pref_config_ = config;
FOR_EACH_OBSERVER(ObserverInterface, observers_,
OnPrefProxyConfigChanged());
}
}
bool PrefProxyConfigTracker::ReadPrefConfig(net::ProxyConfig* config) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// Clear the configuration.
*config = net::ProxyConfig();
// Scan for all "enable" type proxy switches.
static const char* proxy_prefs[] = {
prefs::kProxyPacUrl,
prefs::kProxyServer,
prefs::kProxyBypassList,
prefs::kProxyAutoDetect
};
// Check whether the preference system holds a valid proxy configuration. Note
// that preferences coming from a lower-priority source than the user settings
// are ignored. That's because chrome treats the system settings as the
// default values, which should apply if there's no explicit value forced by
// policy or the user.
bool found_enable_proxy_pref = false;
for (size_t i = 0; i < arraysize(proxy_prefs); i++) {
const PrefService::Preference* pref =
pref_service_->FindPreference(proxy_prefs[i]);
DCHECK(pref);
if (pref && (!pref->IsUserModifiable() || pref->HasUserSetting())) {
found_enable_proxy_pref = true;
break;
}
}
if (!found_enable_proxy_pref &&
!pref_service_->GetBoolean(prefs::kNoProxyServer)) {
return false;
}
if (pref_service_->GetBoolean(prefs::kNoProxyServer)) {
// Ignore all the other proxy config preferences if the use of a proxy
// has been explicitly disabled.
return true;
}
if (pref_service_->HasPrefPath(prefs::kProxyServer)) {
std::string proxy_server = pref_service_->GetString(prefs::kProxyServer);
config->proxy_rules().ParseFromString(proxy_server);
}
if (pref_service_->HasPrefPath(prefs::kProxyPacUrl)) {
std::string proxy_pac = pref_service_->GetString(prefs::kProxyPacUrl);
config->set_pac_url(GURL(proxy_pac));
}
config->set_auto_detect(pref_service_->GetBoolean(prefs::kProxyAutoDetect));
if (pref_service_->HasPrefPath(prefs::kProxyBypassList)) {
std::string proxy_bypass =
pref_service_->GetString(prefs::kProxyBypassList);
config->proxy_rules().bypass_rules.ParseFromString(proxy_bypass);
}
return true;
}
PrefProxyConfigService::PrefProxyConfigService(
PrefProxyConfigTracker* tracker,
net::ProxyConfigService* base_service)
: base_service_(base_service),
pref_config_tracker_(tracker),
registered_observers_(false) {
}
PrefProxyConfigService::~PrefProxyConfigService() {
if (registered_observers_) {
base_service_->RemoveObserver(this);
pref_config_tracker_->RemoveObserver(this);
}
}
void PrefProxyConfigService::AddObserver(
net::ProxyConfigService::Observer* observer) {
RegisterObservers();
observers_.AddObserver(observer);
}
void PrefProxyConfigService::RemoveObserver(
net::ProxyConfigService::Observer* observer) {
observers_.RemoveObserver(observer);
}
bool PrefProxyConfigService::GetLatestProxyConfig(net::ProxyConfig* config) {
RegisterObservers();
const net::ProxyConfig pref_config;
if (pref_config_tracker_->GetProxyConfig(config))
return true;
return base_service_->GetLatestProxyConfig(config);
}
void PrefProxyConfigService::OnLazyPoll() {
base_service_->OnLazyPoll();
}
void PrefProxyConfigService::OnProxyConfigChanged(
const net::ProxyConfig& config) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// Check whether there is a proxy configuration defined by preferences. In
// this case that proxy configuration takes precedence and the change event
// from the delegate proxy service can be disregarded.
net::ProxyConfig pref_config;
if (!pref_config_tracker_->GetProxyConfig(&pref_config)) {
FOR_EACH_OBSERVER(net::ProxyConfigService::Observer, observers_,
OnProxyConfigChanged(config));
}
}
void PrefProxyConfigService::OnPrefProxyConfigChanged() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// Evaluate the proxy configuration. If GetLatestProxyConfig returns false,
// we are using the system proxy service, but it doesn't have a valid
// configuration yet. Once it is ready, OnProxyConfigChanged() will be called
// and broadcast the proxy configuration.
// Note: If a switch between a preference proxy configuration and the system
// proxy configuration occurs an unnecessary notification might get send if
// the two configurations agree. This case should be rare however, so we don't
// handle that case specially.
net::ProxyConfig new_config;
if (GetLatestProxyConfig(&new_config)) {
FOR_EACH_OBSERVER(net::ProxyConfigService::Observer, observers_,
OnProxyConfigChanged(new_config));
}
}
void PrefProxyConfigService::RegisterObservers() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (!registered_observers_) {
base_service_->AddObserver(this);
pref_config_tracker_->AddObserver(this);
registered_observers_ = true;
}
}
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