// Copyright (c) 2010 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/common/pepper_plugin_registry.h"

#include "base/command_line.h"
#include "base/file_util.h"
#include "base/path_service.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_switches.h"
#include "remoting/client/plugin/pepper_entrypoints.h"

// static
PepperPluginRegistry* PepperPluginRegistry::GetInstance() {
  static PepperPluginRegistry registry;
  return &registry;
}

// static
void PepperPluginRegistry::GetList(std::vector<PepperPluginInfo>* plugins) {
  InternalPluginInfoList internal_plugin_info;
  GetInternalPluginInfo(&internal_plugin_info);
  for (InternalPluginInfoList::const_iterator it =
         internal_plugin_info.begin();
       it != internal_plugin_info.end();
       ++it) {
    plugins->push_back(*it);
  }

  GetPluginInfoFromSwitch(plugins);
  GetExtraPlugins(plugins);
}

// static
void PepperPluginRegistry::GetPluginInfoFromSwitch(
    std::vector<PepperPluginInfo>* plugins) {
  const std::wstring& value = CommandLine::ForCurrentProcess()->GetSwitchValue(
      switches::kRegisterPepperPlugins);
  if (value.empty())
    return;

  // FORMAT:
  // command-line = <plugin-entry> + *( LWS + "," + LWS + <plugin-entry> )
  // plugin-entry = <file-path> + ["#" + <name> + ["#" + <description>]] +
  //                *1( LWS + ";" + LWS + <mime-type> )

  std::vector<std::wstring> modules;
  SplitString(value, ',', &modules);
  for (size_t i = 0; i < modules.size(); ++i) {
    std::vector<std::wstring> parts;
    SplitString(modules[i], ';', &parts);
    if (parts.size() < 2) {
      DLOG(ERROR) << "Required mime-type not found";
      continue;
    }

    std::vector<std::wstring> name_parts;
    SplitString(parts[0], '#', &name_parts);

    PepperPluginInfo plugin;
    plugin.path = FilePath::FromWStringHack(name_parts[0]);
    if (name_parts.size() > 1)
      plugin.name = WideToUTF8(name_parts[1]);
    if (name_parts.size() > 2)
      plugin.type_descriptions = WideToUTF8(name_parts[2]);
    for (size_t j = 1; j < parts.size(); ++j)
      plugin.mime_types.push_back(WideToASCII(parts[j]));

    plugins->push_back(plugin);
  }
}

// static
void PepperPluginRegistry::GetExtraPlugins(
    std::vector<PepperPluginInfo>* plugins) {
  FilePath path;
  if (PathService::Get(chrome::FILE_PDF_PLUGIN, &path) &&
      file_util::PathExists(path)) {
    PepperPluginInfo pdf;
    pdf.path = path;
    pdf.name = "Chrome PDF Viewer";
    pdf.mime_types.push_back("application/pdf");
    pdf.file_extensions = "pdf";
    pdf.type_descriptions = "Portable Document Format";
    plugins->push_back(pdf);
  }
}

// static
void PepperPluginRegistry::GetInternalPluginInfo(
    InternalPluginInfoList* plugin_info) {
  // Currently, to centralize the internal plugin registration logic, we
  // hardcode the list of plugins, mimetypes, and registration information
  // in this function.  This is gross, but because the GetList() function is
  // called from both the renderer and browser the other option is to force a
  // special register function for each plugin to be called by both
  // RendererMain() and BrowserMain().  This seemed like the better tradeoff.
  //
  // TODO(ajwong): Think up a better way to maintain the plugin registration
  // information. Pehraps by construction of a singly linked list of
  // plugin initializers that is built with static initializers?

#if defined(ENABLE_REMOTING)
  if (CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kEnableChromoting)) {
    InternalPluginInfo info;
    // Add the chromoting plugin.
    info.path =
        FilePath(FILE_PATH_LITERAL("internal-chromoting"));
    info.mime_types.push_back("pepper-application/x-chromoting");
    info.entry_points.get_interface = remoting::PPP_GetInterface;
    info.entry_points.initialize_module = remoting::PPP_InitializeModule;
    info.entry_points.shutdown_module = remoting::PPP_ShutdownModule;

    plugin_info->push_back(info);
  }
#endif
}

pepper::PluginModule* PepperPluginRegistry::GetModule(
    const FilePath& path) const {
  ModuleMap::const_iterator it = modules_.find(path);
  if (it == modules_.end())
    return NULL;
  return it->second;
}

PepperPluginRegistry::PepperPluginRegistry() {
  InternalPluginInfoList internal_plugin_info;
  GetInternalPluginInfo(&internal_plugin_info);
  // Register modules for these suckers.
  for (InternalPluginInfoList::const_iterator it =
         internal_plugin_info.begin();
       it != internal_plugin_info.end();
       ++it) {
    const FilePath& path = it->path;
    ModuleHandle module =
        pepper::PluginModule::CreateInternalModule(it->entry_points);
    if (!module) {
      DLOG(ERROR) << "Failed to load pepper module: " << path.value();
      continue;
    }
    modules_[path] = module;
  }

  // Add the modules specified on the command line last so that they can
  // override the internal plugins.
  std::vector<PepperPluginInfo> plugins;
  GetPluginInfoFromSwitch(&plugins);
  GetExtraPlugins(&plugins);
  for (size_t i = 0; i < plugins.size(); ++i) {
    const FilePath& path = plugins[i].path;
    ModuleHandle module = pepper::PluginModule::CreateModule(path);
    if (!module) {
      DLOG(ERROR) << "Failed to load pepper module: " << path.value();
      continue;
    }
    modules_[path] = module;
  }
}