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// Copyright 2021 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/browser/user_script_manager.h"
#include "base/containers/contains.h"
#include "content/public/browser/browser_context.h"
#include "extensions/browser/api/scripting/scripting_constants.h"
#include "extensions/browser/api/scripting/scripting_utils.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/extension_system.h"
#include "extensions/browser/extension_util.h"
#include "extensions/browser/extensions_browser_client.h"
#include "extensions/browser/state_store.h"
#include "extensions/browser/user_script_loader.h"
#include "extensions/common/api/content_scripts.h"
#include "extensions/common/manifest_handlers/content_scripts_handler.h"
#include "extensions/common/mojom/host_id.mojom.h"
#include "extensions/common/mojom/run_location.mojom-shared.h"
#include "extensions/common/utils/content_script_utils.h"
namespace extensions {
UserScriptManager::UserScriptManager(content::BrowserContext* browser_context)
: browser_context_(browser_context) {
extension_registry_observation_.Observe(
ExtensionRegistry::Get(browser_context_));
StateStore* store =
ExtensionSystem::Get(browser_context_)->dynamic_user_scripts_store();
if (store)
store->RegisterKey(scripting::kRegisteredScriptsStorageKey);
}
UserScriptManager::~UserScriptManager() = default;
UserScriptLoader* UserScriptManager::GetUserScriptLoaderByID(
const mojom::HostID& host_id) {
switch (host_id.type) {
case mojom::HostID::HostType::kExtensions:
return GetUserScriptLoaderForExtension(host_id.id);
case mojom::HostID::HostType::kWebUi:
return GetUserScriptLoaderForWebUI(GURL(host_id.id));
}
}
ExtensionUserScriptLoader* UserScriptManager::GetUserScriptLoaderForExtension(
const ExtensionId& extension_id) {
const Extension* extension = ExtensionRegistry::Get(browser_context_)
->enabled_extensions()
.GetByID(extension_id);
DCHECK(extension);
auto it = extension_script_loaders_.find(extension->id());
return (it == extension_script_loaders_.end())
? CreateExtensionUserScriptLoader(extension)
: it->second.get();
}
WebUIUserScriptLoader* UserScriptManager::GetUserScriptLoaderForWebUI(
const GURL& url) {
auto it = webui_script_loaders_.find(url);
return (it == webui_script_loaders_.end()) ? CreateWebUIUserScriptLoader(url)
: it->second.get();
}
void UserScriptManager::OnExtensionWillBeInstalled(
content::BrowserContext* browser_context,
const Extension* extension,
bool is_update,
const std::string& old_name) {
scripting::ClearPersistentScriptURLPatterns(browser_context, extension->id());
}
void UserScriptManager::OnExtensionLoaded(
content::BrowserContext* browser_context,
const Extension* extension) {
ExtensionUserScriptLoader* loader =
GetUserScriptLoaderForExtension(extension->id());
if (loader->AddScriptsForExtensionLoad(
*extension,
base::BindOnce(&UserScriptManager::OnInitialExtensionLoadComplete,
weak_factory_.GetWeakPtr()))) {
pending_initial_extension_loads_.insert(extension->id());
}
}
void UserScriptManager::OnExtensionUnloaded(
content::BrowserContext* browser_context,
const Extension* extension,
UnloadedExtensionReason reason) {
// The renderer will clean up its scripts from an IPC message which is sent
// when the extension is unloaded. All we need to do here is to remove the
// unloaded extension's loader.
extension_script_loaders_.erase(extension->id());
RemovePendingExtensionLoadAndSignal(extension->id());
}
void UserScriptManager::OnInitialExtensionLoadComplete(
UserScriptLoader* loader,
const absl::optional<std::string>& error) {
RemovePendingExtensionLoadAndSignal(loader->host_id().id);
}
void UserScriptManager::RemovePendingExtensionLoadAndSignal(
const ExtensionId& extension_id) {
int erased = pending_initial_extension_loads_.erase(extension_id);
if (!erased || !pending_initial_extension_loads_.empty())
return; // Not a relevant extension, or still waiting on more.
// All our extensions are loaded!
ExtensionsBrowserClient::Get()->SignalContentScriptsLoaded(browser_context_);
}
ExtensionUserScriptLoader* UserScriptManager::CreateExtensionUserScriptLoader(
const Extension* extension) {
DCHECK(!base::Contains(extension_script_loaders_, extension->id()));
// Inserts a new ExtensionUserScriptLoader and returns a ptr to it.
ExtensionUserScriptLoader* loader =
extension_script_loaders_
.emplace(extension->id(),
std::make_unique<ExtensionUserScriptLoader>(
browser_context_, *extension,
ExtensionSystem::Get(browser_context_)
->dynamic_user_scripts_store(),
/*listen_for_extension_system_loaded=*/true))
.first->second.get();
return loader;
}
WebUIUserScriptLoader* UserScriptManager::CreateWebUIUserScriptLoader(
const GURL& url) {
DCHECK(!base::Contains(webui_script_loaders_, url));
// Inserts a new WebUIUserScriptLoader and returns a ptr to it.
WebUIUserScriptLoader* loader =
webui_script_loaders_
.emplace(url, std::make_unique<WebUIUserScriptLoader>(
browser_context_, url))
.first->second.get();
return loader;
}
} // namespace extensions
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