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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/external_install_manager.h"
#include <string>
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/extensions/external_install_error.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_source.h"
#include "extensions/browser/extension_prefs.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/extension.h"
#include "extensions/common/feature_switch.h"
#include "extensions/common/manifest.h"
#include "extensions/common/manifest_url_handlers.h"
namespace extensions {
namespace {
// Histogram values for logging events related to externally installed
// extensions.
enum ExternalExtensionEvent {
EXTERNAL_EXTENSION_INSTALLED = 0,
EXTERNAL_EXTENSION_IGNORED,
EXTERNAL_EXTENSION_REENABLED,
EXTERNAL_EXTENSION_UNINSTALLED,
EXTERNAL_EXTENSION_BUCKET_BOUNDARY,
};
// Prompt the user this many times before considering an extension acknowledged.
const int kMaxExtensionAcknowledgePromptCount = 3;
void LogExternalExtensionEvent(const Extension* extension,
ExternalExtensionEvent event) {
UMA_HISTOGRAM_ENUMERATION("Extensions.ExternalExtensionEvent",
event,
EXTERNAL_EXTENSION_BUCKET_BOUNDARY);
if (ManifestURL::UpdatesFromGallery(extension)) {
UMA_HISTOGRAM_ENUMERATION("Extensions.ExternalExtensionEventWebstore",
event,
EXTERNAL_EXTENSION_BUCKET_BOUNDARY);
} else {
UMA_HISTOGRAM_ENUMERATION("Extensions.ExternalExtensionEventNonWebstore",
event,
EXTERNAL_EXTENSION_BUCKET_BOUNDARY);
}
}
} // namespace
ExternalInstallManager::ExternalInstallManager(
content::BrowserContext* browser_context,
bool is_first_run)
: browser_context_(browser_context),
is_first_run_(is_first_run),
extension_prefs_(ExtensionPrefs::Get(browser_context_)),
extension_registry_observer_(this) {
DCHECK(browser_context_);
extension_registry_observer_.Add(ExtensionRegistry::Get(browser_context_));
registrar_.Add(
this,
extensions::NOTIFICATION_EXTENSION_REMOVED,
content::Source<Profile>(Profile::FromBrowserContext(browser_context_)));
}
ExternalInstallManager::~ExternalInstallManager() {
}
void ExternalInstallManager::AddExternalInstallError(const Extension* extension,
bool is_new_profile) {
if (HasExternalInstallError())
return; // Only have one external install error at a time.
ExternalInstallError::AlertType alert_type =
(ManifestURL::UpdatesFromGallery(extension) && !is_new_profile)
? ExternalInstallError::BUBBLE_ALERT
: ExternalInstallError::MENU_ALERT;
error_.reset(new ExternalInstallError(
browser_context_, extension->id(), alert_type, this));
}
void ExternalInstallManager::RemoveExternalInstallError() {
error_.reset();
UpdateExternalExtensionAlert();
}
bool ExternalInstallManager::HasExternalInstallError() const {
return error_.get() != NULL;
}
void ExternalInstallManager::UpdateExternalExtensionAlert() {
// If the feature is not enabled, or there is already an error displayed, do
// nothing.
if (!FeatureSwitch::prompt_for_external_extensions()->IsEnabled() ||
HasExternalInstallError()) {
return;
}
// Look for any extensions that were disabled because of being unacknowledged
// external extensions.
const Extension* extension = NULL;
const ExtensionSet& disabled_extensions =
ExtensionRegistry::Get(browser_context_)->disabled_extensions();
for (ExtensionSet::const_iterator iter = disabled_extensions.begin();
iter != disabled_extensions.end();
++iter) {
if (IsUnacknowledgedExternalExtension(iter->get())) {
extension = iter->get();
break;
}
}
if (!extension)
return; // No unacknowledged external extensions.
// Otherwise, warn the user about the suspicious extension.
if (extension_prefs_->IncrementAcknowledgePromptCount(extension->id()) >
kMaxExtensionAcknowledgePromptCount) {
// Stop prompting for this extension and record metrics.
extension_prefs_->AcknowledgeExternalExtension(extension->id());
LogExternalExtensionEvent(extension, EXTERNAL_EXTENSION_IGNORED);
// Check if there's another extension that needs prompting.
UpdateExternalExtensionAlert();
return;
}
if (is_first_run_)
extension_prefs_->SetExternalInstallFirstRun(extension->id());
// |first_run| is true if the extension was installed during a first run
// (even if it's post-first run now).
AddExternalInstallError(
extension, extension_prefs_->IsExternalInstallFirstRun(extension->id()));
}
void ExternalInstallManager::AcknowledgeExternalExtension(
const std::string& id) {
extension_prefs_->AcknowledgeExternalExtension(id);
UpdateExternalExtensionAlert();
}
bool ExternalInstallManager::HasExternalInstallBubbleForTesting() const {
return error_.get() &&
error_->alert_type() == ExternalInstallError::BUBBLE_ALERT;
}
void ExternalInstallManager::OnExtensionLoaded(
content::BrowserContext* browser_context,
const Extension* extension) {
if (!IsUnacknowledgedExternalExtension(extension))
return;
// We treat loading as acknowledgement (since the user consciously chose to
// re-enable the extension).
AcknowledgeExternalExtension(extension->id());
LogExternalExtensionEvent(extension, EXTERNAL_EXTENSION_REENABLED);
// If we had an error for this extension, remove it.
if (error_.get() && extension->id() == error_->extension_id())
RemoveExternalInstallError();
}
void ExternalInstallManager::OnExtensionInstalled(
content::BrowserContext* browser_context,
const Extension* extension,
bool is_update) {
// Certain extension locations are specific enough that we can
// auto-acknowledge any extension that came from one of them.
if (Manifest::IsPolicyLocation(extension->location()) ||
extension->location() == Manifest::EXTERNAL_COMPONENT) {
AcknowledgeExternalExtension(extension->id());
return;
}
if (!IsUnacknowledgedExternalExtension(extension))
return;
LogExternalExtensionEvent(extension, EXTERNAL_EXTENSION_INSTALLED);
UpdateExternalExtensionAlert();
}
void ExternalInstallManager::OnExtensionUninstalled(
content::BrowserContext* browser_context,
const Extension* extension,
extensions::UninstallReason reason) {
if (IsUnacknowledgedExternalExtension(extension))
LogExternalExtensionEvent(extension, EXTERNAL_EXTENSION_UNINSTALLED);
}
bool ExternalInstallManager::IsUnacknowledgedExternalExtension(
const Extension* extension) const {
if (!FeatureSwitch::prompt_for_external_extensions()->IsEnabled())
return false;
return (Manifest::IsExternalLocation(extension->location()) &&
!extension_prefs_->IsExternalExtensionAcknowledged(extension->id()) &&
!(extension_prefs_->GetDisableReasons(extension->id()) &
Extension::DISABLE_SIDELOAD_WIPEOUT));
}
void ExternalInstallManager::Observe(
int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
DCHECK_EQ(extensions::NOTIFICATION_EXTENSION_REMOVED, type);
// The error is invalidated if the extension has been loaded or removed.
// It's a shame we have to use the notification system (instead of the
// registry observer) for this, but the ExtensionUnloaded notification is
// not sent out if the extension is disabled (which it is here).
if (error_.get() &&
content::Details<const Extension>(details).ptr()->id() ==
error_->extension_id()) {
RemoveExternalInstallError();
}
}
} // namespace extensions
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