// Copyright (c) 2011 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_COMMON_PEPPER_PLUGIN_REGISTRY_H_
#define CHROME_COMMON_PEPPER_PLUGIN_REGISTRY_H_
#pragma once

#include <map>
#include <string>
#include <vector>

#include "base/file_path.h"
#include "webkit/plugins/ppapi/plugin_delegate.h"
#include "webkit/plugins/ppapi/plugin_module.h"

struct PepperPluginInfo {
  PepperPluginInfo();
  ~PepperPluginInfo();

  // Indicates internal plugins for which there's not actually a library.
  // Defaults to false.
  bool is_internal;

  // True when this plugin should be run out of process. Defaults to false.
  bool is_out_of_process;

  FilePath path;  // Internal plugins have "internal-[name]" as path.
  std::vector<std::string> mime_types;
  std::string name;
  std::string description;
  std::string file_extensions;
  std::string type_descriptions;
};

// This class holds references to all of the known pepper plugin modules.
//
// It keeps two lists. One list of preloaded in-process modules, and one list
// is a list of all live modules (some of which may be out-of-process and hence
// not preloaded).
class PepperPluginRegistry
    : public webkit::ppapi::PluginDelegate::ModuleLifetime {
 public:
  ~PepperPluginRegistry();

  static const char* kPDFPluginName;
  static const char* kPDFPluginMimeType;
  static const char* kPDFPluginExtension;
  static const char* kPDFPluginDescription;

  static const char* kNaClPluginName;
  static const char* kNaClPluginMimeType;
  static const char* kNaClPluginExtension;
  static const char* kNaClPluginDescription;

  static PepperPluginRegistry* GetInstance();

  // Returns the list of known pepper plugins.  This method is static so that
  // it can be used by the browser process, which has no need to load the
  // pepper plugin modules.
  static void GetList(std::vector<PepperPluginInfo>* plugins);

  // Loads the (native) libraries but does not initialize them (i.e., does not
  // call PPP_InitializeModule). This is needed by the zygote on Linux to get
  // access to the plugins before entering the sandbox.
  static void PreloadModules();

  // Returns true if the given plugin is a pepper plugin that should be run
  // out of process.
  bool RunOutOfProcessForPlugin(const FilePath& path) const;

  // Returns an existing loaded module for the given path. It will search for
  // both preloaded in-process or currently active out-of-process plugins
  // matching the given name. Returns NULL if the plugin hasn't been loaded.
  webkit::ppapi::PluginModule* GetModule(const FilePath& path);

  // Notifies the registry that a new non-preloaded module has been created.
  // This is normally called for out-of-process plugins. Once this is called,
  // the module is available to be returned by GetModule(). The module will
  // automatically unregister itself by calling PluginModuleDestroyed().
  void AddLiveModule(const FilePath& path, webkit::ppapi::PluginModule* module);

  // ModuleLifetime implementation.
  virtual void PluginModuleDestroyed(
      webkit::ppapi::PluginModule* destroyed_module);

 private:
  static void GetPluginInfoFromSwitch(std::vector<PepperPluginInfo>* plugins);
  static void GetExtraPlugins(std::vector<PepperPluginInfo>* plugins);

  struct InternalPluginInfo : public PepperPluginInfo {
    InternalPluginInfo();  // Sets |is_internal|.
    webkit::ppapi::PluginModule::EntryPoints entry_points;
  };
  typedef std::vector<InternalPluginInfo> InternalPluginInfoList;
  static void GetInternalPluginInfo(InternalPluginInfoList* plugin_info);

  PepperPluginRegistry();

  typedef std::map<FilePath, scoped_refptr<webkit::ppapi::PluginModule> >
      OwningModuleMap;
  OwningModuleMap preloaded_modules_;

  // A list of non-owning pointers to all currently-live plugin modules. This
  // includes both preloaded ones in preloaded_modules_, and out-of-process
  // modules whose lifetime is managed externally.
  typedef std::map<FilePath, webkit::ppapi::PluginModule*> NonOwningModuleMap;
  NonOwningModuleMap live_modules_;
};

#endif  // CHROME_COMMON_PEPPER_PLUGIN_REGISTRY_H_