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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/permissions_updater.h"
#include "base/json/json_writer.h"
#include "base/memory/ref_counted.h"
#include "base/values.h"
#include "chrome/browser/extensions/api/permissions/permissions_api_helpers.h"
#include "chrome/browser/extensions/event_router.h"
#include "chrome/browser/extensions/extension_prefs.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/extensions/extension_system.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/signin/token_service.h"
#include "chrome/browser/signin/token_service_factory.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/extensions/api/permissions.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/extensions/extension_messages.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/render_process_host.h"
#include "google_apis/gaia/oauth2_mint_token_flow.h"
using content::RenderProcessHost;
using extensions::permissions_api_helpers::PackPermissionSet;
using extensions::PermissionSet;
namespace extensions {
namespace {
const char kOnAdded[] = "permissions.onAdded";
const char kOnRemoved[] = "permissions.onRemoved";
// An object to link the lifetime of an OAuth2MintTokenFlow to a Profile.
// The flow should not outlive the profile because the request context will
// become invalid.
class OAuth2GrantRecorder : public OAuth2MintTokenFlow::Delegate,
public content::NotificationObserver {
public:
OAuth2GrantRecorder(Profile* profile, const Extension* extension)
: ALLOW_THIS_IN_INITIALIZER_LIST(flow_(
profile->GetRequestContext(),
this,
OAuth2MintTokenFlow::Parameters(
TokenServiceFactory::GetForProfile(profile)->
GetOAuth2LoginRefreshToken(),
extension->id(),
extension->oauth2_info().client_id,
extension->oauth2_info().scopes,
OAuth2MintTokenFlow::MODE_RECORD_GRANT))) {
notification_registrar_.Add(this,
chrome::NOTIFICATION_PROFILE_DESTROYED,
content::Source<Profile>(profile));
flow_.Start();
}
// content::NotificationObserver:
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE {
DCHECK_EQ(type, chrome::NOTIFICATION_PROFILE_DESTROYED);
delete this;
}
// OAuth2MintTokenFlow::Delegate:
virtual void OnMintTokenSuccess(const std::string& access_token) OVERRIDE {
delete this;
}
virtual void OnIssueAdviceSuccess(
const IssueAdviceInfo& issue_advice) OVERRIDE {
delete this;
}
virtual void OnMintTokenFailure(
const GoogleServiceAuthError& error) OVERRIDE {
delete this;
}
private:
virtual ~OAuth2GrantRecorder() {}
OAuth2MintTokenFlow flow_;
content::NotificationRegistrar notification_registrar_;
};
} // namespace
PermissionsUpdater::PermissionsUpdater(Profile* profile)
: profile_(profile) {}
PermissionsUpdater::~PermissionsUpdater() {}
void PermissionsUpdater::AddPermissions(
const Extension* extension, const PermissionSet* permissions) {
scoped_refptr<const PermissionSet> existing(
extension->GetActivePermissions());
scoped_refptr<PermissionSet> total(
PermissionSet::CreateUnion(existing, permissions));
scoped_refptr<PermissionSet> added(
PermissionSet::CreateDifference(total.get(), existing));
UpdateActivePermissions(extension, total.get());
// Update the granted permissions so we don't auto-disable the extension.
GrantActivePermissions(extension, false);
NotifyPermissionsUpdated(ADDED, extension, added.get());
}
void PermissionsUpdater::RemovePermissions(
const Extension* extension, const PermissionSet* permissions) {
scoped_refptr<const PermissionSet> existing(
extension->GetActivePermissions());
scoped_refptr<PermissionSet> total(
PermissionSet::CreateDifference(existing, permissions));
scoped_refptr<PermissionSet> removed(
PermissionSet::CreateDifference(existing, total.get()));
// We update the active permissions, and not the granted permissions, because
// the extension, not the user, removed the permissions. This allows the
// extension to add them again without prompting the user.
UpdateActivePermissions(extension, total.get());
NotifyPermissionsUpdated(REMOVED, extension, removed.get());
}
void PermissionsUpdater::GrantActivePermissions(const Extension* extension,
bool record_oauth2_grant) {
CHECK(extension);
// We only maintain the granted permissions prefs for INTERNAL and LOAD
// extensions.
if (extension->location() != Extension::LOAD &&
extension->location() != Extension::INTERNAL)
return;
if (record_oauth2_grant) {
// Only record OAuth grant if:
// 1. The extension has client id and scopes.
// 2. The user is signed in to Chrome.
const Extension::OAuth2Info& oauth2_info = extension->oauth2_info();
if (!oauth2_info.client_id.empty() && !oauth2_info.scopes.empty()) {
TokenService* token_service = TokenServiceFactory::GetForProfile(
profile_);
if (token_service && token_service->HasOAuthLoginToken()) {
new OAuth2GrantRecorder(profile_, extension);
}
}
}
GetExtensionPrefs()->AddGrantedPermissions(extension->id(),
extension->GetActivePermissions());
}
void PermissionsUpdater::UpdateActivePermissions(
const Extension* extension, const PermissionSet* permissions) {
GetExtensionPrefs()->SetActivePermissions(extension->id(), permissions);
extension->SetActivePermissions(permissions);
}
void PermissionsUpdater::DispatchEvent(
const std::string& extension_id,
const char* event_name,
const PermissionSet* changed_permissions) {
if (!profile_ ||
!extensions::ExtensionSystem::Get(profile_)->event_router())
return;
scoped_ptr<ListValue> value(new ListValue());
scoped_ptr<api::permissions::Permissions> permissions =
PackPermissionSet(changed_permissions);
value->Append(permissions->ToValue().release());
extensions::ExtensionSystem::Get(profile_)->event_router()->
DispatchEventToExtension(extension_id, event_name, value.Pass(),
profile_, GURL());
}
void PermissionsUpdater::NotifyPermissionsUpdated(
EventType event_type,
const Extension* extension,
const PermissionSet* changed) {
if (!changed || changed->IsEmpty())
return;
UpdatedExtensionPermissionsInfo::Reason reason;
const char* event_name = NULL;
if (event_type == REMOVED) {
reason = UpdatedExtensionPermissionsInfo::REMOVED;
event_name = kOnRemoved;
} else {
CHECK_EQ(ADDED, event_type);
reason = UpdatedExtensionPermissionsInfo::ADDED;
event_name = kOnAdded;
}
// Notify other APIs or interested parties.
UpdatedExtensionPermissionsInfo info = UpdatedExtensionPermissionsInfo(
extension, changed, reason);
content::NotificationService::current()->Notify(
chrome::NOTIFICATION_EXTENSION_PERMISSIONS_UPDATED,
content::Source<Profile>(profile_),
content::Details<UpdatedExtensionPermissionsInfo>(&info));
// Send the new permissions to the renderers.
for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
!i.IsAtEnd(); i.Advance()) {
RenderProcessHost* host = i.GetCurrentValue();
Profile* profile = Profile::FromBrowserContext(host->GetBrowserContext());
if (profile_->IsSameProfile(profile))
host->Send(new ExtensionMsg_UpdatePermissions(
static_cast<int>(reason),
extension->id(),
changed->apis(),
changed->explicit_hosts(),
changed->scriptable_hosts()));
}
// Trigger the onAdded and onRemoved events in the extension.
DispatchEvent(extension->id(), event_name, changed);
}
ExtensionPrefs* PermissionsUpdater::GetExtensionPrefs() {
return extensions::ExtensionSystem::Get(profile_)->extension_service()->
extension_prefs();
}
} // namespace extensions
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