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// Copyright 2013 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 "extensions/common/features/feature_provider.h"
#include <map>
#include <memory>
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/trace_event/trace_event.h"
#include "content/public/common/content_switches.h"
#include "extensions/common/extensions_client.h"
#include "extensions/common/features/feature.h"
#include "extensions/common/features/feature_util.h"
#include "extensions/common/switches.h"
namespace extensions {
namespace {
class FeatureProviderStatic {
public:
FeatureProviderStatic() {
TRACE_EVENT0("startup",
"extensions::FeatureProvider::FeatureProviderStatic");
base::Time begin_time = base::Time::Now();
ExtensionsClient* client = ExtensionsClient::Get();
feature_providers_["api"] = client->CreateFeatureProvider("api");
feature_providers_["manifest"] = client->CreateFeatureProvider("manifest");
feature_providers_["permission"] =
client->CreateFeatureProvider("permission");
feature_providers_["behavior"] = client->CreateFeatureProvider("behavior");
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
std::string process_type =
command_line->GetSwitchValueASCII(::switches::kProcessType);
// Measure time only for browser process. This method gets called by the
// browser process on startup, as well as on renderer and extension
// processes throughout the execution of the browser. We are more
// interested in how long this takes as a startup cost, so we are
// just measuring the time in the browser process.
if (process_type == std::string()) {
UMA_HISTOGRAM_TIMES("Extensions.FeatureProviderStaticInitTime",
base::Time::Now() - begin_time);
}
}
FeatureProvider* GetFeatures(const std::string& name) const {
auto it = feature_providers_.find(name);
if (it == feature_providers_.end())
CRASH_WITH_MINIDUMP("FeatureProvider \"" + name + "\" not found");
return it->second.get();
}
private:
std::map<std::string, std::unique_ptr<FeatureProvider>> feature_providers_;
DISALLOW_COPY_AND_ASSIGN(FeatureProviderStatic);
};
base::LazyInstance<FeatureProviderStatic>::Leaky g_feature_provider_static =
LAZY_INSTANCE_INITIALIZER;
const Feature* GetFeatureFromProviderByName(const std::string& provider_name,
const std::string& feature_name) {
const Feature* feature =
FeatureProvider::GetByName(provider_name)->GetFeature(feature_name);
// We should always refer to existing features, but we can't CHECK here
// due to flaky JSONReader fails, see: crbug.com/176381, crbug.com/602936
DCHECK(feature) << "Feature \"" << feature_name << "\" not found in "
<< "FeatureProvider \"" << provider_name << "\"";
return feature;
}
} // namespace
FeatureProvider::FeatureProvider() {}
FeatureProvider::~FeatureProvider() {}
// static
const FeatureProvider* FeatureProvider::GetByName(const std::string& name) {
return g_feature_provider_static.Get().GetFeatures(name);
}
// static
const FeatureProvider* FeatureProvider::GetAPIFeatures() {
return GetByName("api");
}
// static
const FeatureProvider* FeatureProvider::GetManifestFeatures() {
return GetByName("manifest");
}
// static
const FeatureProvider* FeatureProvider::GetPermissionFeatures() {
return GetByName("permission");
}
// static
const FeatureProvider* FeatureProvider::GetBehaviorFeatures() {
return GetByName("behavior");
}
// static
const Feature* FeatureProvider::GetAPIFeature(const std::string& name) {
return GetFeatureFromProviderByName("api", name);
}
// static
const Feature* FeatureProvider::GetManifestFeature(const std::string& name) {
return GetFeatureFromProviderByName("manifest", name);
}
// static
const Feature* FeatureProvider::GetPermissionFeature(const std::string& name) {
return GetFeatureFromProviderByName("permission", name);
}
// static
const Feature* FeatureProvider::GetBehaviorFeature(const std::string& name) {
return GetFeatureFromProviderByName("behavior", name);
}
const Feature* FeatureProvider::GetFeature(const std::string& name) const {
FeatureMap::const_iterator iter = features_.find(name);
if (iter != features_.end())
return iter->second.get();
else
return nullptr;
}
const Feature* FeatureProvider::GetParent(const Feature& feature) const {
if (feature.no_parent())
return nullptr;
std::vector<base::StringPiece> split = base::SplitStringPiece(
feature.name(), ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
if (split.size() < 2)
return nullptr;
split.pop_back();
return GetFeature(base::JoinString(split, "."));
}
// Children of a given API are named starting with parent.name()+".", which
// means they'll be contiguous in the features_ std::map.
std::vector<const Feature*> FeatureProvider::GetChildren(
const Feature& parent) const {
std::string prefix = parent.name() + ".";
const FeatureMap::const_iterator first_child = features_.lower_bound(prefix);
// All children have names before (parent.name() + ('.'+1)).
++prefix.back();
const FeatureMap::const_iterator after_children =
features_.lower_bound(prefix);
std::vector<const Feature*> result;
result.reserve(std::distance(first_child, after_children));
for (FeatureMap::const_iterator it = first_child; it != after_children;
++it) {
if (!it->second->no_parent())
result.push_back(it->second.get());
}
return result;
}
const FeatureMap& FeatureProvider::GetAllFeatures() const {
return features_;
}
void FeatureProvider::AddFeature(base::StringPiece name,
std::unique_ptr<Feature> feature) {
features_[name.as_string()] = std::move(feature);
}
void FeatureProvider::AddFeature(base::StringPiece name, Feature* feature) {
features_[name.as_string()] = std::unique_ptr<Feature>(feature);
}
} // namespace extensions
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