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// Copyright 2014 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/extensions/active_script_controller.h"
#include "base/metrics/histogram.h"
#include "base/stl_util.h"
#include "chrome/browser/extensions/extension_action.h"
#include "chrome/browser/extensions/location_bar_controller.h"
#include "chrome/browser/extensions/tab_helper.h"
#include "chrome/common/extensions/api/extension_action/action_info.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/web_contents.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_messages.h"
#include "extensions/common/extension_set.h"
#include "extensions/common/feature_switch.h"
#include "extensions/common/permissions/permissions_data.h"
#include "ipc/ipc_message_macros.h"
namespace extensions {
ActiveScriptController::ActiveScriptController(
content::WebContents* web_contents)
: content::WebContentsObserver(web_contents),
enabled_(FeatureSwitch::scripts_require_action()->IsEnabled()) {
}
ActiveScriptController::~ActiveScriptController() {
LogUMA();
}
// static
ActiveScriptController* ActiveScriptController::GetForWebContents(
content::WebContents* web_contents) {
if (!web_contents)
return NULL;
TabHelper* tab_helper = TabHelper::FromWebContents(web_contents);
if (!tab_helper)
return NULL;
LocationBarController* location_bar_controller =
tab_helper->location_bar_controller();
// This should never be NULL.
DCHECK(location_bar_controller);
return location_bar_controller->active_script_controller();
}
void ActiveScriptController::NotifyScriptExecuting(
const std::string& extension_id, int page_id) {
content::NavigationEntry* visible_entry =
web_contents()->GetController().GetVisibleEntry();
if (!visible_entry ||
extensions_executing_scripts_.count(extension_id) ||
visible_entry->GetPageID() != page_id) {
return;
}
const Extension* extension =
ExtensionRegistry::Get(web_contents()->GetBrowserContext())
->enabled_extensions().GetByID(extension_id);
if (extension &&
PermissionsData::RequiresActionForScriptExecution(extension)) {
extensions_executing_scripts_.insert(extension_id);
LocationBarController::NotifyChange(web_contents());
}
}
void ActiveScriptController::OnAdInjectionDetected(
const std::vector<std::string> ad_injectors) {
size_t num_preventable_ad_injectors =
base::STLSetIntersection<std::set<std::string> >(
ad_injectors, extensions_executing_scripts_).size();
UMA_HISTOGRAM_COUNTS_100(
"Extensions.ActiveScriptController.PreventableAdInjectors",
num_preventable_ad_injectors);
UMA_HISTOGRAM_COUNTS_100(
"Extensions.ActiveScriptController.PreventableAdInjectors",
ad_injectors.size() - num_preventable_ad_injectors);
}
ExtensionAction* ActiveScriptController::GetActionForExtension(
const Extension* extension) {
if (!enabled_ || extensions_executing_scripts_.count(extension->id()) == 0)
return NULL; // No action for this extension.
ActiveScriptMap::iterator existing =
active_script_actions_.find(extension->id());
if (existing != active_script_actions_.end())
return existing->second.get();
linked_ptr<ExtensionAction> action(new ExtensionAction(
extension->id(), ActionInfo::TYPE_PAGE, ActionInfo()));
action->SetTitle(ExtensionAction::kDefaultTabId, extension->name());
action->SetIsVisible(ExtensionAction::kDefaultTabId, true);
const ActionInfo* action_info = ActionInfo::GetPageActionInfo(extension);
if (!action_info)
action_info = ActionInfo::GetBrowserActionInfo(extension);
if (action_info && !action_info->default_icon.empty()) {
action->set_default_icon(
make_scoped_ptr(new ExtensionIconSet(action_info->default_icon)));
}
active_script_actions_[extension->id()] = action;
return action.get();
}
LocationBarController::Action ActiveScriptController::OnClicked(
const Extension* extension) {
DCHECK(extensions_executing_scripts_.count(extension->id()) > 0);
return LocationBarController::ACTION_NONE;
}
void ActiveScriptController::OnNavigated() {
LogUMA();
extensions_executing_scripts_.clear();
}
bool ActiveScriptController::OnMessageReceived(const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(ActiveScriptController, message)
IPC_MESSAGE_HANDLER(ExtensionHostMsg_NotifyExtensionScriptExecution,
OnNotifyExtensionScriptExecution)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void ActiveScriptController::OnNotifyExtensionScriptExecution(
const std::string& extension_id,
int page_id) {
if (!Extension::IdIsValid(extension_id)) {
NOTREACHED() << "'" << extension_id << "' is not a valid id.";
return;
}
NotifyScriptExecuting(extension_id, page_id);
}
void ActiveScriptController::LogUMA() const {
UMA_HISTOGRAM_COUNTS_100(
"Extensions.ActiveScriptController.ShownActiveScriptsOnPage",
extensions_executing_scripts_.size());
}
} // namespace extensions
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