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// Copyright (c) 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/manifest_handler.h"
#include <map>
#include "base/logging.h"
#include "base/stl_util.h"
#include "chrome/common/extensions/extension.h"
namespace extensions {
namespace {
static base::LazyInstance<ManifestHandlerRegistry> g_registry =
LAZY_INSTANCE_INITIALIZER;
static ManifestHandlerRegistry* g_registry_override = NULL;
ManifestHandlerRegistry* GetRegistry() {
if (!g_registry_override)
return g_registry.Pointer();
return g_registry_override;
}
} // namespace
ManifestHandler::ManifestHandler() {
}
ManifestHandler::~ManifestHandler() {
}
bool ManifestHandler::Validate(const Extension* extension,
std::string* error,
std::vector<InstallWarning>* warnings) const {
return true;
}
bool ManifestHandler::AlwaysParseForType(Manifest::Type type) const {
return false;
}
bool ManifestHandler::AlwaysValidateForType(Manifest::Type type) const {
return false;
}
const std::vector<std::string> ManifestHandler::PrerequisiteKeys() const {
return std::vector<std::string>();
}
void ManifestHandler::Register() {
linked_ptr<ManifestHandler> this_linked(this);
const std::vector<std::string> keys = Keys();
for (size_t i = 0; i < keys.size(); ++i)
GetRegistry()->RegisterManifestHandler(keys[i], this_linked);
}
// static
void ManifestHandler::FinalizeRegistration() {
GetRegistry()->Finalize();
}
// static
bool ManifestHandler::IsRegistrationFinalized() {
return GetRegistry()->is_finalized_;
}
// static
bool ManifestHandler::ParseExtension(Extension* extension, string16* error) {
return GetRegistry()->ParseExtension(extension, error);
}
// static
bool ManifestHandler::ValidateExtension(const Extension* extension,
std::string* error,
std::vector<InstallWarning>* warnings) {
return GetRegistry()->ValidateExtension(extension, error, warnings);
}
// static
const std::vector<std::string> ManifestHandler::SingleKey(
const std::string& key) {
return std::vector<std::string>(1, key);
}
ManifestHandlerRegistry::ManifestHandlerRegistry() : is_finalized_(false) {
}
ManifestHandlerRegistry::~ManifestHandlerRegistry() {
}
void ManifestHandlerRegistry::Finalize() {
CHECK(!is_finalized_);
SortManifestHandlers();
is_finalized_ = true;
}
void ManifestHandlerRegistry::RegisterManifestHandler(
const std::string& key, linked_ptr<ManifestHandler> handler) {
CHECK(!is_finalized_);
handlers_[key] = handler;
}
bool ManifestHandlerRegistry::ParseExtension(Extension* extension,
string16* error) {
std::map<int, ManifestHandler*> handlers_by_priority;
for (ManifestHandlerMap::iterator iter = handlers_.begin();
iter != handlers_.end(); ++iter) {
ManifestHandler* handler = iter->second.get();
if (extension->manifest()->HasPath(iter->first) ||
handler->AlwaysParseForType(extension->GetType())) {
handlers_by_priority[priority_map_[handler]] = handler;
}
}
for (std::map<int, ManifestHandler*>::iterator iter =
handlers_by_priority.begin();
iter != handlers_by_priority.end(); ++iter) {
if (!(iter->second)->Parse(extension, error))
return false;
}
return true;
}
bool ManifestHandlerRegistry::ValidateExtension(
const Extension* extension,
std::string* error,
std::vector<InstallWarning>* warnings) {
std::set<ManifestHandler*> handlers;
for (ManifestHandlerMap::iterator iter = handlers_.begin();
iter != handlers_.end(); ++iter) {
ManifestHandler* handler = iter->second.get();
if (extension->manifest()->HasPath(iter->first) ||
handler->AlwaysValidateForType(extension->GetType())) {
handlers.insert(handler);
}
}
for (std::set<ManifestHandler*>::iterator iter = handlers.begin();
iter != handlers.end(); ++iter) {
if (!(*iter)->Validate(extension, error, warnings))
return false;
}
return true;
}
// static
ManifestHandlerRegistry* ManifestHandlerRegistry::SetForTesting(
ManifestHandlerRegistry* new_registry) {
ManifestHandlerRegistry* old_registry = GetRegistry();
if (new_registry != g_registry.Pointer())
g_registry_override = new_registry;
else
g_registry_override = NULL;
return old_registry;
}
void ManifestHandlerRegistry::SortManifestHandlers() {
std::set<ManifestHandler*> unsorted_handlers;
for (ManifestHandlerMap::const_iterator iter = handlers_.begin();
iter != handlers_.end(); ++iter) {
unsorted_handlers.insert(iter->second.get());
}
int priority = 0;
while (true) {
std::set<ManifestHandler*> next_unsorted_handlers;
for (std::set<ManifestHandler*>::const_iterator iter =
unsorted_handlers.begin();
iter != unsorted_handlers.end(); ++iter) {
ManifestHandler* handler = *iter;
const std::vector<std::string>& prerequisites =
handler->PrerequisiteKeys();
int unsatisfied = prerequisites.size();
for (size_t i = 0; i < prerequisites.size(); ++i) {
ManifestHandlerMap::const_iterator prereq_iter =
handlers_.find(prerequisites[i]);
// If the prerequisite does not exist, crash.
CHECK(prereq_iter != handlers_.end())
<< "Extension manifest handler depends on unrecognized key "
<< prerequisites[i];
// Prerequisite is in our map.
if (ContainsKey(priority_map_, prereq_iter->second.get()))
unsatisfied--;
}
if (unsatisfied == 0) {
priority_map_[handler] = priority;
priority++;
} else {
// Put in the list for next time.
next_unsorted_handlers.insert(handler);
}
}
if (next_unsorted_handlers.size() == unsorted_handlers.size())
break;
unsorted_handlers.swap(next_unsorted_handlers);
}
// If there are any leftover unsorted handlers, they must have had
// circular dependencies.
CHECK(unsorted_handlers.size() == 0) << "Extension manifest handlers have "
<< "circular dependencies!";
}
} // namespace extensions
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