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// Copyright (c) 2012 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/navigation_observer.h"
#include "base/memory/ptr_util.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_types.h"
#include "extensions/browser/extension_prefs.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/extension_system.h"
using content::NavigationController;
using content::NavigationEntry;
namespace extensions {
namespace {
// Whether to repeatedly prompt for the same extension id.
bool g_repeat_prompting = false;
}
NavigationObserver::NavigationObserver(Profile* profile)
: profile_(profile),
extension_registry_observer_(this),
weak_factory_(this) {
RegisterForNotifications();
extension_registry_observer_.Add(ExtensionRegistry::Get(profile));
}
NavigationObserver::~NavigationObserver() {}
void NavigationObserver::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
DCHECK_EQ(content::NOTIFICATION_NAV_ENTRY_COMMITTED, type);
NavigationController* controller =
content::Source<NavigationController>(source).ptr();
if (!profile_->IsSameProfile(
Profile::FromBrowserContext(controller->GetBrowserContext())))
return;
PromptToEnableExtensionIfNecessary(controller);
}
// static
void NavigationObserver::SetAllowedRepeatedPromptingForTesting(bool allowed) {
g_repeat_prompting = allowed;
}
void NavigationObserver::RegisterForNotifications() {
registrar_.Add(this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
content::NotificationService::AllSources());
}
void NavigationObserver::PromptToEnableExtensionIfNecessary(
NavigationController* nav_controller) {
// Bail out if we're already running a prompt.
if (!in_progress_prompt_extension_id_.empty())
return;
NavigationEntry* nav_entry = nav_controller->GetVisibleEntry();
if (!nav_entry)
return;
const GURL& url = nav_entry->GetURL();
// NOTE: We only consider chrome-extension:// urls, and deliberately don't
// consider hosted app urls. This is because it's really annoying to visit the
// site associated with a hosted app (like calendar.google.com or
// drive.google.com) and have it repeatedly prompt you to re-enable an item.
// Visiting a chrome-extension:// url is a much stronger signal, and, without
// the item enabled, we won't show anything.
// TODO(devlin): While true, I still wonder how useful this is. We should get
// metrics.
if (!url.SchemeIs(kExtensionScheme))
return;
const Extension* extension = ExtensionRegistry::Get(profile_)
->disabled_extensions()
.GetExtensionOrAppByURL(url);
if (!extension)
return;
// Try not to repeatedly prompt the user about the same extension.
if (!prompted_extensions_.insert(extension->id()).second &&
!g_repeat_prompting) {
return;
}
ExtensionPrefs* extension_prefs = ExtensionPrefs::Get(profile_);
// TODO(devlin): Why do we only consider extensions that escalate permissions?
// Maybe because it's the only one we have a good prompt for?
if (extension_prefs->DidExtensionEscalatePermissions(extension->id())) {
// Keep track of the extension id and nav controller we're prompting for.
// These must be reset in OnInstallPromptDone.
in_progress_prompt_extension_id_ = extension->id();
in_progress_prompt_navigation_controller_ = nav_controller;
extension_install_prompt_.reset(
new ExtensionInstallPrompt(nav_controller->GetWebContents()));
ExtensionInstallPrompt::PromptType type =
ExtensionInstallPrompt::GetReEnablePromptTypeForExtension(profile_,
extension);
extension_install_prompt_->ShowDialog(
base::Bind(&NavigationObserver::OnInstallPromptDone,
weak_factory_.GetWeakPtr()),
extension, nullptr,
base::MakeUnique<ExtensionInstallPrompt::Prompt>(type),
ExtensionInstallPrompt::GetDefaultShowDialogCallback());
}
}
void NavigationObserver::OnInstallPromptDone(
ExtensionInstallPrompt::Result result) {
// The extension was already uninstalled.
if (in_progress_prompt_extension_id_.empty())
return;
ExtensionService* extension_service =
extensions::ExtensionSystem::Get(profile_)->extension_service();
const Extension* extension = extension_service->GetExtensionById(
in_progress_prompt_extension_id_, true);
CHECK(extension);
if (result == ExtensionInstallPrompt::Result::ACCEPTED) {
NavigationController* nav_controller =
in_progress_prompt_navigation_controller_;
CHECK(nav_controller);
// Grant permissions, re-enable the extension, and then reload the tab.
extension_service->GrantPermissionsAndEnableExtension(extension);
nav_controller->Reload(content::ReloadType::NORMAL, true);
} else {
// TODO(devlin): These metrics aren't very useful, since they're lumped in
// with the same for re-enabling/canceling when the extension first gets
// disabled, which is likely significantly more common (though impossible to
// tell). We need to separate these.
std::string histogram_name =
result == ExtensionInstallPrompt::Result::USER_CANCELED
? "ReEnableCancel"
: "ReEnableAbort";
ExtensionService::RecordPermissionMessagesHistogram(extension,
histogram_name.c_str());
}
in_progress_prompt_extension_id_ = std::string();
in_progress_prompt_navigation_controller_ = nullptr;
extension_install_prompt_.reset();
}
void NavigationObserver::OnExtensionUninstalled(
content::BrowserContext* browser_context,
const Extension* extension,
UninstallReason reason) {
if (in_progress_prompt_extension_id_.empty() ||
in_progress_prompt_extension_id_ != extension->id()) {
return;
}
in_progress_prompt_extension_id_ = std::string();
in_progress_prompt_navigation_controller_ = nullptr;
extension_install_prompt_.reset();
}
} // namespace extensions
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