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// Copyright 2024 The Chromium Authors
// 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_registry.h"
#include <stddef.h>
#include <map>
#include <vector>
#include "base/check.h"
#include "base/containers/contains.h"
#include "extensions/common/extension.h"
#include "extensions/common/manifest_handler.h"
#include "extensions/common/permissions/manifest_permission.h"
#include "extensions/common/permissions/manifest_permission_set.h"
namespace extensions {
namespace {
static base::LazyInstance<ManifestHandlerRegistry>::DestructorAtExit
g_registry = LAZY_INSTANCE_INITIALIZER;
static ManifestHandlerRegistry* g_registry_override = nullptr;
} // namespace
// static
const size_t ManifestHandlerRegistry::kHandlerMax;
ManifestHandlerRegistry::ManifestHandlerRegistry() = default;
ManifestHandlerRegistry::~ManifestHandlerRegistry() = default;
void ManifestHandlerRegistry::Finalize() {
CHECK(!is_finalized_);
SortManifestHandlers();
is_finalized_ = true;
}
void ManifestHandlerRegistry::RegisterHandler(
std::unique_ptr<ManifestHandler> handler) {
CHECK(!is_finalized_);
ManifestHandler* raw_handler = handler.get();
owned_manifest_handlers_.push_back(std::move(handler));
for (const char* key : raw_handler->Keys()) {
auto insertion = handlers_.emplace(key, raw_handler);
DCHECK(insertion.second)
<< "A ManifestHandler was already registered for key: " << key;
}
}
bool ManifestHandlerRegistry::ParseExtension(Extension* extension,
std::u16string* error) {
std::map<int, ManifestHandler*> handlers_by_priority;
for (const auto& iter : handlers_) {
ManifestHandler* handler = iter.second;
if (extension->manifest()->FindPath(iter.first) ||
handler->AlwaysParseForType(extension->GetType())) {
handlers_by_priority[priority_map_[handler]] = handler;
}
}
for (const auto& iter : handlers_by_priority) {
if (!iter.second->Parse(extension, error)) {
return false;
}
}
return true;
}
bool ManifestHandlerRegistry::ValidateExtension(
const Extension* extension,
std::string* error,
std::vector<InstallWarning>* warnings) {
CHECK(extension);
std::set<ManifestHandler*> handlers;
for (const auto& iter : handlers_) {
ManifestHandler* handler = iter.second;
if (extension->manifest()->FindPath(iter.first) ||
handler->AlwaysValidateForType(extension->GetType())) {
handlers.insert(handler);
}
}
for (auto* handler : handlers) {
if (!handler->Validate(*extension, error, warnings)) {
return false;
}
}
return true;
}
ManifestPermission* ManifestHandlerRegistry::CreatePermission(
const std::string& name) {
ManifestHandlerMap::const_iterator it = handlers_.find(name);
if (it == handlers_.end()) {
return nullptr;
}
return it->second->CreatePermission();
}
void ManifestHandlerRegistry::AddExtensionInitialRequiredPermissions(
const Extension* extension,
ManifestPermissionSet* permission_set) {
for (ManifestHandlerMap::const_iterator it = handlers_.begin();
it != handlers_.end(); ++it) {
std::unique_ptr<ManifestPermission> permission(
it->second->CreateInitialRequiredPermission(extension));
if (permission) {
permission_set->insert(std::move(permission));
}
}
}
// static
ManifestHandlerRegistry* ManifestHandlerRegistry::Get() {
return g_registry_override ? g_registry_override : g_registry.Pointer();
}
// static
ManifestHandlerRegistry* ManifestHandlerRegistry::SetForTesting(
ManifestHandlerRegistry* new_registry) {
ManifestHandlerRegistry* old_registry = ManifestHandlerRegistry::Get();
if (new_registry != g_registry.Pointer()) {
g_registry_override = new_registry;
} else {
g_registry_override = nullptr;
}
return old_registry;
}
// static
void ManifestHandlerRegistry::ResetForTesting() {
ManifestHandlerRegistry* registry = Get();
registry->priority_map_.clear();
registry->handlers_.clear();
registry->is_finalized_ = false;
}
void ManifestHandlerRegistry::SortManifestHandlers() {
std::vector<ManifestHandler*> unsorted_handlers;
unsorted_handlers.reserve(handlers_.size());
for (const auto& key_value : handlers_) {
unsorted_handlers.push_back(key_value.second);
}
int priority = 0;
while (true) {
std::vector<ManifestHandler*> next_unsorted_handlers;
next_unsorted_handlers.reserve(unsorted_handlers.size());
for (ManifestHandler* handler : unsorted_handlers) {
const std::vector<std::string>& prerequisites =
handler->PrerequisiteKeys();
int unsatisfied = prerequisites.size();
for (const std::string& key : prerequisites) {
ManifestHandlerMap::const_iterator prereq_iter = handlers_.find(key);
// If the prerequisite does not exist, crash.
CHECK(prereq_iter != handlers_.end())
<< "Extension manifest handler depends on unrecognized key " << key;
// Prerequisite is in our map.
if (base::Contains(priority_map_, prereq_iter->second)) {
unsatisfied--;
}
}
if (unsatisfied == 0) {
priority_map_[handler] = priority;
priority++;
} else {
// Put in the list for next time.
next_unsorted_handlers.push_back(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.empty())
<< "Extension manifest handlers have circular dependencies!";
}
} // namespace extensions
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