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// Copyright (c) 2006-2008 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/chrome_plugin_lib.h"
#include "base/command_line.h"
#include "base/hash_tables.h"
#include "base/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/path_service.h"
#include "base/perftimer.h"
#include "base/thread.h"
#if defined(OS_WIN)
#include "base/registry.h"
#endif
#include "base/string_util.h"
#include "chrome/common/chrome_counters.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/notification_service.h"
#include "chrome/common/chrome_paths.h"
#include "webkit/glue/plugins/plugin_list.h"
using base::TimeDelta;
// TODO(port): revisit when plugins happier
#if defined(OS_WIN)
const wchar_t ChromePluginLib::kRegistryChromePlugins[] =
L"Software\\Google\\Chrome\\Plugins";
static const wchar_t kRegistryLoadOnStartup[] = L"LoadOnStartup";
static const wchar_t kRegistryPath[] = L"Path";
#endif
typedef base::hash_map<FilePath, scoped_refptr<ChromePluginLib> >
PluginMap;
// A map of all the instantiated plugins.
static PluginMap* g_loaded_libs;
// The thread plugins are loaded and used in, lazily initialized upon
// the first creation call.
static PlatformThreadId g_plugin_thread_id = 0;
static MessageLoop* g_plugin_thread_loop = NULL;
static bool IsSingleProcessMode() {
// We don't support ChromePlugins in single-process mode.
return CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess);
}
// static
bool ChromePluginLib::IsInitialized() {
return (g_loaded_libs != NULL);
}
// static
ChromePluginLib* ChromePluginLib::Create(const FilePath& filename,
const CPBrowserFuncs* bfuncs) {
// Keep a map of loaded plugins to ensure we only load each library once.
if (!g_loaded_libs) {
g_loaded_libs = new PluginMap();
g_plugin_thread_id = PlatformThread::CurrentId();
g_plugin_thread_loop = MessageLoop::current();
}
DCHECK(IsPluginThread());
PluginMap::const_iterator iter = g_loaded_libs->find(filename);
if (iter != g_loaded_libs->end())
return iter->second;
scoped_refptr<ChromePluginLib> plugin(new ChromePluginLib(filename));
if (!plugin->CP_Initialize(bfuncs))
return NULL;
(*g_loaded_libs)[filename] = plugin;
return plugin;
}
// static
ChromePluginLib* ChromePluginLib::Find(const FilePath& filename) {
if (g_loaded_libs) {
PluginMap::const_iterator iter = g_loaded_libs->find(filename);
if (iter != g_loaded_libs->end())
return iter->second;
}
return NULL;
}
// static
void ChromePluginLib::Destroy(const FilePath& filename) {
DCHECK(g_loaded_libs);
PluginMap::iterator iter = g_loaded_libs->find(filename);
if (iter != g_loaded_libs->end()) {
iter->second->Unload();
g_loaded_libs->erase(iter);
}
}
// static
bool ChromePluginLib::IsPluginThread() {
return PlatformThread::CurrentId() == g_plugin_thread_id;
}
// static
MessageLoop* ChromePluginLib::GetPluginThreadLoop() {
return g_plugin_thread_loop;
}
// static
void ChromePluginLib::RegisterPluginsWithNPAPI() {
// We don't support ChromePlugins in single-process mode.
if (IsSingleProcessMode())
return;
FilePath path;
// Register Gears, if available.
if (PathService::Get(chrome::FILE_GEARS_PLUGIN, &path))
NPAPI::PluginList::Singleton()->AddExtraPluginPath(path);
}
static void LogPluginLoadTime(const TimeDelta &time) {
UMA_HISTOGRAM_TIMES("Gears.LoadTime", time);
}
// static
void ChromePluginLib::LoadChromePlugins(const CPBrowserFuncs* bfuncs) {
static bool loaded = false;
if (loaded)
return;
loaded = true;
// We don't support ChromePlugins in single-process mode.
if (IsSingleProcessMode())
return;
FilePath path;
if (!PathService::Get(chrome::FILE_GEARS_PLUGIN, &path))
return;
PerfTimer timer;
ChromePluginLib::Create(path, bfuncs);
LogPluginLoadTime(timer.Elapsed());
// TODO(mpcomplete): disabled loading of plugins from the registry until we
// phase out registry keys from the gears installer.
#if 0
for (RegistryKeyIterator iter(HKEY_CURRENT_USER, kRegistryChromePlugins);
iter.Valid(); ++iter) {
// Use the registry to gather plugin across the file system.
std::wstring reg_path = kRegistryChromePlugins;
reg_path.append(L"\\");
reg_path.append(iter.Name());
RegKey key(HKEY_CURRENT_USER, reg_path.c_str());
DWORD is_persistent;
if (key.ReadValueDW(kRegistryLoadOnStartup, &is_persistent) &&
is_persistent) {
std::wstring path;
if (key.ReadValue(kRegistryPath, &path)) {
ChromePluginLib::Create(path, bfuncs);
}
}
}
#endif
}
// static
void ChromePluginLib::UnloadAllPlugins() {
if (g_loaded_libs) {
PluginMap::iterator it;
for (PluginMap::iterator it = g_loaded_libs->begin();
it != g_loaded_libs->end(); ++it) {
it->second->Unload();
}
delete g_loaded_libs;
g_loaded_libs = NULL;
}
}
const CPPluginFuncs& ChromePluginLib::functions() const {
DCHECK(initialized_);
DCHECK(IsPluginThread());
return plugin_funcs_;
}
ChromePluginLib::ChromePluginLib(const FilePath& filename)
: filename_(filename),
#if defined(OS_WIN)
module_(0),
#endif
initialized_(false),
CP_VersionNegotiate_(NULL),
CP_Initialize_(NULL),
CP_Test_(NULL) {
memset((void*)&plugin_funcs_, 0, sizeof(plugin_funcs_));
}
ChromePluginLib::~ChromePluginLib() {
}
bool ChromePluginLib::CP_Initialize(const CPBrowserFuncs* bfuncs) {
LOG(INFO) << "ChromePluginLib::CP_Initialize(" << filename_.value() <<
"): initialized=" << initialized_;
if (initialized_)
return true;
if (!Load())
return false;
if (CP_VersionNegotiate_) {
uint16 selected_version = 0;
CPError rv = CP_VersionNegotiate_(CP_VERSION, CP_VERSION,
&selected_version);
if ( (rv != CPERR_SUCCESS) || (selected_version != CP_VERSION))
return false;
}
plugin_funcs_.size = sizeof(plugin_funcs_);
CPError rv = CP_Initialize_(cpid(), bfuncs, &plugin_funcs_);
initialized_ = (rv == CPERR_SUCCESS) &&
(CP_GET_MAJOR_VERSION(plugin_funcs_.version) == CP_MAJOR_VERSION) &&
(CP_GET_MINOR_VERSION(plugin_funcs_.version) <= CP_MINOR_VERSION);
LOG(INFO) << "ChromePluginLib::CP_Initialize(" << filename_.value() <<
"): initialized=" << initialized_ <<
"): result=" << rv;
return initialized_;
}
void ChromePluginLib::CP_Shutdown() {
DCHECK(initialized_);
functions().shutdown();
initialized_ = false;
memset((void*)&plugin_funcs_, 0, sizeof(plugin_funcs_));
}
int ChromePluginLib::CP_Test(void* param) {
DCHECK(initialized_);
if (!CP_Test_)
return -1;
return CP_Test_(param);
}
bool ChromePluginLib::Load() {
#if !defined(OS_WIN)
// Mac and Linux won't implement Gears.
return false;
#else
DCHECK(module_ == 0);
module_ = LoadLibrary(filename_.value().c_str());
if (module_ == 0)
return false;
// required initialization function
CP_Initialize_ = reinterpret_cast<CP_InitializeFunc>
(GetProcAddress(module_, "CP_Initialize"));
if (!CP_Initialize_) {
FreeLibrary(module_);
module_ = 0;
return false;
}
// optional version negotiation function
CP_VersionNegotiate_ = reinterpret_cast<CP_VersionNegotiateFunc>
(GetProcAddress(module_, "CP_VersionNegotiate"));
// optional test function
CP_Test_ = reinterpret_cast<CP_TestFunc>
(GetProcAddress(module_, "CP_Test"));
return true;
#endif
}
void ChromePluginLib::Unload() {
NotificationService::current()->Notify(
NotificationType::CHROME_PLUGIN_UNLOADED,
Source<ChromePluginLib>(this),
NotificationService::NoDetails());
if (initialized_)
CP_Shutdown();
#if defined(OS_WIN)
if (module_) {
FreeLibrary(module_);
module_ = 0;
}
#endif
}
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