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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.
#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_MANAGEMENT_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_MANAGEMENT_H_
#include <map>
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "base/prefs/pref_change_registrar.h"
#include "base/values.h"
#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
#include "components/keyed_service/core/keyed_service.h"
#include "extensions/browser/management_policy.h"
#include "extensions/common/extension.h"
#include "extensions/common/manifest.h"
#include "extensions/common/url_pattern_set.h"
class GURL;
class PrefService;
namespace content {
class BrowserContext;
} // namespace content
namespace extensions {
// Tracks the management policies that affect extensions and provides interfaces
// for observing and obtaining the global settings for all extensions, as well
// as per-extension settings.
class ExtensionManagement : public KeyedService {
public:
// Observer class for extension management settings changes.
class Observer {
public:
virtual ~Observer() {}
// Will be called when an extension management preference changes.
virtual void OnExtensionManagementSettingsChanged() = 0;
};
// Installation mode for extensions, default is INSTALLATION_ALLOWED.
// * INSTALLATION_ALLOWED: Extension can be installed.
// * INSTALLATION_BLOCKED: Extension cannot be installed.
// * INSTALLATION_FORCED: Extension will be installed automatically
// and cannot be disabled.
// * INSTALLATION_RECOMMENDED: Extension will be installed automatically but
// can be disabled.
enum InstallationMode {
INSTALLATION_ALLOWED = 0,
INSTALLATION_BLOCKED,
INSTALLATION_FORCED,
INSTALLATION_RECOMMENDED,
};
// Class to hold extension management settings for one or a group of
// extensions. Settings can be applied to an individual extension identified
// by an ID, a group of extensions with specific |update_url| or all
// extensions at once.
struct IndividualSettings {
IndividualSettings();
~IndividualSettings();
void Reset();
// Extension installation mode. Setting this to INSTALLATION_FORCED or
// INSTALLATION_RECOMMENDED will enable extension auto-loading (only
// applicable to single extension), and in this case the |update_url| must
// be specified, containing the update URL for this extension.
// Note that |update_url| will be ignored for INSTALLATION_ALLOWED and
// INSTALLATION_BLOCKED installation mode.
// These settings will override the default settings, and unspecified
// settings will take value from default settings.
InstallationMode installation_mode;
std::string update_url;
};
// Global extension management settings, applicable to all extensions.
struct GlobalSettings {
GlobalSettings();
~GlobalSettings();
void Reset();
// Settings specifying which URLs are allowed to install extensions, will be
// enforced only if |has_restricted_install_sources| is set to true.
URLPatternSet install_sources;
bool has_restricted_install_sources;
// Settings specifying all allowed app/extension types, will be enforced
// only of |has_restricted_allowed_types| is set to true.
std::vector<Manifest::Type> allowed_types;
bool has_restricted_allowed_types;
};
typedef std::map<ExtensionId, IndividualSettings> SettingsIdMap;
explicit ExtensionManagement(PrefService* pref_service);
virtual ~ExtensionManagement();
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Get the ManagementPolicy::Provider controlled by extension management
// policy settings.
ManagementPolicy::Provider* GetProvider();
// Checks if extensions are blacklisted by default, by policy. When true,
// this means that even extensions without an ID should be blacklisted (e.g.
// from the command line, or when loaded as an unpacked extension).
bool BlacklistedByDefault();
// Returns the force install list, in format specified by
// ExternalPolicyLoader::AddExtension().
scoped_ptr<base::DictionaryValue> GetForceInstallList() const;
// Returns if an extension with id |id| is explicitly allowed by enterprise
// policy or not.
bool IsInstallationExplicitlyAllowed(const ExtensionId& id) const;
// Returns true if an extension download should be allowed to proceed.
bool IsOffstoreInstallAllowed(const GURL& url, const GURL& referrer_url);
// Helper function to read |settings_by_id_| with |id| as key. Returns a
// constant reference to default settings if |id| does not exist.
const IndividualSettings& ReadById(const ExtensionId& id) const;
// Returns a constant reference to |global_settings_|.
const GlobalSettings& ReadGlobalSettings() const;
private:
// Load all extension management preferences from |pref_service|, and
// refresh the settings.
void Refresh();
// Load preference with name |pref_name| and expected type |expected_type|.
// If |force_managed| is true, only loading from the managed preference store
// is allowed. Returns NULL if the preference is not present, not allowed to
// be loaded from or has the wrong type.
const base::Value* LoadPreference(const char* pref_name,
bool force_managed,
base::Value::Type expected_type);
void OnExtensionPrefChanged();
void NotifyExtensionManagementPrefChanged();
// Helper function to access |settings_by_id_| with |id| as key.
// Adds a new IndividualSettings entry to |settings_by_id_| if none exists for
// |id| yet.
IndividualSettings* AccessById(const ExtensionId& id);
// A map containing all IndividualSettings applied to an individual extension
// identified by extension ID. The extension ID is used as index key of the
// map.
// TODO(binjin): Add |settings_by_update_url_|, and implement mechanism for
// it.
SettingsIdMap settings_by_id_;
// The default IndividualSettings.
// For extension settings applied to an individual extension (identified by
// extension ID) or a group of extension (with specified extension update
// URL), all unspecified part will take value from |default_settings_|.
// For all other extensions, all settings from |default_settings_| will be
// enforced.
IndividualSettings default_settings_;
// Extension settings applicable to all extensions.
GlobalSettings global_settings_;
PrefService* pref_service_;
ObserverList<Observer, true> observer_list_;
PrefChangeRegistrar pref_change_registrar_;
scoped_ptr<ManagementPolicy::Provider> provider_;
DISALLOW_COPY_AND_ASSIGN(ExtensionManagement);
};
class ExtensionManagementFactory : public BrowserContextKeyedServiceFactory {
public:
static ExtensionManagement* GetForBrowserContext(
content::BrowserContext* context);
static ExtensionManagementFactory* GetInstance();
private:
friend struct DefaultSingletonTraits<ExtensionManagementFactory>;
ExtensionManagementFactory();
virtual ~ExtensionManagementFactory();
// BrowserContextKeyedServiceExtensionManagementFactory:
virtual KeyedService* BuildServiceInstanceFor(
content::BrowserContext* context) const OVERRIDE;
virtual content::BrowserContext* GetBrowserContextToUse(
content::BrowserContext* context) const OVERRIDE;
virtual void RegisterProfilePrefs(
user_prefs::PrefRegistrySyncable* registry) OVERRIDE;
DISALLOW_COPY_AND_ASSIGN(ExtensionManagementFactory);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_MANAGEMENT_H_
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