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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.
#include "chrome/browser/policy/cloud_policy_provider_impl.h"
#include <set>
#include "base/values.h"
#include "chrome/browser/policy/configuration_policy_pref_store.h"
namespace policy {
CloudPolicyProviderImpl::CloudPolicyProviderImpl(
const ConfigurationPolicyProvider::PolicyDefinitionList* policy_list,
CloudPolicyCacheBase::PolicyLevel level)
: CloudPolicyProvider(policy_list),
level_(level),
initialization_complete_(true) {}
CloudPolicyProviderImpl::~CloudPolicyProviderImpl() {
for (ListType::iterator i = caches_.begin(); i != caches_.end(); ++i)
(*i)->RemoveObserver(this);
FOR_EACH_OBSERVER(ConfigurationPolicyProvider::Observer,
observer_list_, OnProviderGoingAway());
}
bool CloudPolicyProviderImpl::Provide(
ConfigurationPolicyStoreInterface* store) {
ApplyPolicyMap(&combined_, store);
return true;
}
bool CloudPolicyProviderImpl::IsInitializationComplete() const {
return initialization_complete_;
}
void CloudPolicyProviderImpl::AddObserver(
ConfigurationPolicyProvider::Observer* observer) {
observer_list_.AddObserver(observer);
}
void CloudPolicyProviderImpl::RemoveObserver(
ConfigurationPolicyProvider::Observer* observer) {
observer_list_.RemoveObserver(observer);
}
void CloudPolicyProviderImpl::OnCacheUpdate(CloudPolicyCacheBase* cache) {
RecombineCachesAndMaybeTriggerUpdate();
}
void CloudPolicyProviderImpl::OnCacheGoingAway(CloudPolicyCacheBase* cache) {
cache->RemoveObserver(this);
for (ListType::iterator i = caches_.begin(); i != caches_.end(); ++i) {
if (*i == cache) {
caches_.erase(i);
break;
}
}
RecombineCachesAndMaybeTriggerUpdate();
}
void CloudPolicyProviderImpl::AppendCache(CloudPolicyCacheBase* cache) {
initialization_complete_ &= cache->IsReady();
cache->AddObserver(this);
caches_.push_back(cache);
RecombineCachesAndMaybeTriggerUpdate();
}
void CloudPolicyProviderImpl::PrependCache(CloudPolicyCacheBase* cache) {
initialization_complete_ &= cache->IsReady();
cache->AddObserver(this);
caches_.insert(caches_.begin(), cache);
RecombineCachesAndMaybeTriggerUpdate();
}
// static
void CloudPolicyProviderImpl::CombineTwoPolicyMaps(const PolicyMap& base,
const PolicyMap& overlay,
PolicyMap* out_map) {
bool added_proxy_policy = false;
out_map->Clear();
for (PolicyMap::const_iterator i = base.begin(); i != base.end(); ++i) {
out_map->Set(i->first, i->second->DeepCopy());
added_proxy_policy = added_proxy_policy ||
ConfigurationPolicyPrefStore::IsProxyPolicy(i->first);
}
// Add every entry of |overlay| which has not been added by |base|. Only add
// proxy policies if none of them was added by |base|.
for (PolicyMap::const_iterator i = overlay.begin(); i != overlay.end(); ++i) {
if (ConfigurationPolicyPrefStore::IsProxyPolicy(i->first)) {
if (!added_proxy_policy) {
out_map->Set(i->first, i->second->DeepCopy());
}
} else if (!out_map->Get(i->first)) {
out_map->Set(i->first, i->second->DeepCopy());
}
}
}
void CloudPolicyProviderImpl::RecombineCachesAndMaybeTriggerUpdate() {
// Re-check whether all caches are ready.
bool force_update = false;
if (!initialization_complete_) {
bool all_caches_ready = true;
for (ListType::const_iterator i = caches_.begin();
i != caches_.end(); ++i) {
if (!(*i)->IsReady()) {
all_caches_ready = false;
break;
}
}
if (all_caches_ready) {
force_update = true;
initialization_complete_ = true;
}
}
// Reconstruct the merged policy map.
PolicyMap newly_combined;
for (ListType::iterator i = caches_.begin(); i != caches_.end(); ++i) {
if (!(*i)->IsReady())
continue;
PolicyMap tmp_map;
CombineTwoPolicyMaps(newly_combined, *(*i)->policy(level_), &tmp_map);
newly_combined.Swap(&tmp_map);
}
if (newly_combined.Equals(combined_) && !force_update)
return;
// Trigger a notification if there was a change.
combined_.Swap(&newly_combined);
FOR_EACH_OBSERVER(ConfigurationPolicyProvider::Observer,
observer_list_, OnUpdatePolicy());
}
} // namespace policy
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