content/browser/plugin_service_impl.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/plugin_service_impl.h"
   6
   7 #include "base/bind.h"
   8 #include "base/command_line.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/files/file_path.h"
  11 #include "base/location.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/single_thread_task_runner.h"
  14 #include "base/strings/string_util.h"
  15 #include "base/strings/utf_string_conversions.h"
  16 #include "base/synchronization/waitable_event.h"
  17 #include "base/threading/thread.h"
  18 #include "content/browser/ppapi_plugin_process_host.h"
  19 #include "content/browser/renderer_host/render_process_host_impl.h"
  20 #include "content/browser/renderer_host/render_view_host_impl.h"
  21 #include "content/common/content_switches_internal.h"
  22 #include "content/common/pepper_plugin_list.h"
  23 #include "content/common/plugin_list.h"
  24 #include "content/common/view_messages.h"
  25 #include "content/public/browser/browser_thread.h"
  26 #include "content/public/browser/content_browser_client.h"
  27 #include "content/public/browser/plugin_service_filter.h"
  28 #include "content/public/browser/resource_context.h"
  29 #include "content/public/common/content_constants.h"
  30 #include "content/public/common/content_switches.h"
  31 #include "content/public/common/process_type.h"
  32 #include "content/public/common/webplugininfo.h"
  33
  34 #if defined(OS_WIN)
  35 #include "content/common/plugin_constants_win.h"
  36 #include "ui/gfx/win/hwnd_util.h"
  37 #endif
  38
  39 #if defined(OS_POSIX)
  40 #include "content/browser/plugin_loader_posix.h"
  41 #endif
  42
  43 #if defined(OS_POSIX) && !defined(OS_OPENBSD) && !defined(OS_ANDROID)
  44 using ::base::FilePathWatcher;
  45 #endif
  46
  47 namespace content {
  48 namespace {
  49
  50 // This enum is used to collect Flash usage data.
  51 enum FlashUsage {
  52   // Number of browser processes that have started at least one NPAPI Flash
  53   // process during their lifetime.
  54   START_NPAPI_FLASH_AT_LEAST_ONCE,
  55   // Number of browser processes that have started at least one PPAPI Flash
  56   // process during their lifetime.
  57   START_PPAPI_FLASH_AT_LEAST_ONCE,
  58   // Total number of browser processes.
  59   TOTAL_BROWSER_PROCESSES,
  60   FLASH_USAGE_ENUM_COUNT
  61 };
  62
  63 enum NPAPIPluginStatus {
  64   // Platform does not support NPAPI.
  65   NPAPI_STATUS_UNSUPPORTED,
  66   // Platform supports NPAPI and NPAPI is disabled.
  67   NPAPI_STATUS_DISABLED,
  68   // Platform supports NPAPI and NPAPI is enabled.
  69   NPAPI_STATUS_ENABLED,
  70   NPAPI_STATUS_ENUM_COUNT
  71 };
  72
  73 bool LoadPluginListInProcess() {
  74 #if defined(OS_WIN)
  75   return true;
  76 #else
  77   // If on POSIX, we don't want to load the list of NPAPI plugins in-process as
  78   // that causes instability.
  79
  80   // Can't load the plugins on the utility thread when in single process mode
  81   // since that requires GTK which can only be used on the main thread.
  82   if (RenderProcessHost::run_renderer_in_process())
  83     return true;
  84
  85   return !PluginService::GetInstance()->NPAPIPluginsSupported();
  86 #endif
  87 }
  88
  89 // Callback set on the PluginList to assert that plugin loading happens on the
  90 // correct thread.
  91 void WillLoadPluginsCallback(
  92     base::SequencedWorkerPool::SequenceToken token) {
  93   if (LoadPluginListInProcess()) {
  94     CHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
  95         token));
  96   } else {
  97     CHECK(false) << "Plugin loading should happen out-of-process.";
  98   }
  99 }
 100
 101 #if defined(OS_MACOSX)
 102 void NotifyPluginsOfActivation() {
 103   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 104
 105   for (PluginProcessHostIterator iter; !iter.Done(); ++iter)
 106     iter->OnAppActivation();
 107 }
 108 #endif
 109
 110 #if defined(OS_POSIX) && !defined(OS_OPENBSD) && !defined(OS_ANDROID)
 111 void NotifyPluginDirChanged(const base::FilePath& path, bool error) {
 112   if (error) {
 113     // TODO(pastarmovj): Add some sensible error handling. Maybe silently
 114     // stopping the watcher would be enough. Or possibly restart it.
 115     NOTREACHED();
 116     return;
 117   }
 118   VLOG(1) << "Watched path changed: " << path.value();
 119   // Make the plugin list update itself
 120   PluginList::Singleton()->RefreshPlugins();
 121   BrowserThread::PostTask(
 122       BrowserThread::UI, FROM_HERE,
 123       base::Bind(&PluginService::PurgePluginListCache,
 124                  static_cast<BrowserContext*>(NULL), false));
 125 }
 126 #endif
 127
 128 void ForwardCallback(base::SingleThreadTaskRunner* target_task_runner,
 129                      const PluginService::GetPluginsCallback& callback,
 130                      const std::vector<WebPluginInfo>& plugins) {
 131   target_task_runner->PostTask(FROM_HERE, base::Bind(callback, plugins));
 132 }
 133
 134 }  // namespace
 135
 136 // static
 137 PluginService* PluginService::GetInstance() {
 138   return PluginServiceImpl::GetInstance();
 139 }
 140
 141 void PluginService::PurgePluginListCache(BrowserContext* browser_context,
 142                                          bool reload_pages) {
 143   for (RenderProcessHost::iterator it = RenderProcessHost::AllHostsIterator();
 144        !it.IsAtEnd(); it.Advance()) {
 145     RenderProcessHost* host = it.GetCurrentValue();
 146     if (!browser_context || host->GetBrowserContext() == browser_context)
 147       host->Send(new ViewMsg_PurgePluginListCache(reload_pages));
 148   }
 149 }
 150
 151 // static
 152 PluginServiceImpl* PluginServiceImpl::GetInstance() {
 153   return Singleton<PluginServiceImpl>::get();
 154 }
 155
 156 PluginServiceImpl::PluginServiceImpl()
 157     : npapi_plugins_enabled_(false), filter_(NULL) {
 158   // Collect the total number of browser processes (which create
 159   // PluginServiceImpl objects, to be precise). The number is used to normalize
 160   // the number of processes which start at least one NPAPI/PPAPI Flash process.
 161   static bool counted = false;
 162   if (!counted) {
 163     counted = true;
 164     UMA_HISTOGRAM_ENUMERATION("Plugin.FlashUsage", TOTAL_BROWSER_PROCESSES,
 165                               FLASH_USAGE_ENUM_COUNT);
 166   }
 167 }
 168
 169 PluginServiceImpl::~PluginServiceImpl() {
 170   // Make sure no plugin channel requests have been leaked.
 171   DCHECK(pending_plugin_clients_.empty());
 172 }
 173
 174 void PluginServiceImpl::Init() {
 175   plugin_list_token_ = BrowserThread::GetBlockingPool()->GetSequenceToken();
 176   PluginList::Singleton()->set_will_load_plugins_callback(
 177       base::Bind(&WillLoadPluginsCallback, plugin_list_token_));
 178
 179   RegisterPepperPlugins();
 180
 181   // Load any specified on the command line as well.
 182   const base::CommandLine* command_line =
 183       base::CommandLine::ForCurrentProcess();
 184   base::FilePath path =
 185       command_line->GetSwitchValuePath(switches::kLoadPlugin);
 186   if (!path.empty())
 187     AddExtraPluginPath(path);
 188   path = command_line->GetSwitchValuePath(switches::kExtraPluginDir);
 189   if (!path.empty())
 190     PluginList::Singleton()->AddExtraPluginDir(path);
 191
 192   if (command_line->HasSwitch(switches::kDisablePluginsDiscovery))
 193     PluginList::Singleton()->DisablePluginsDiscovery();
 194 }
 195
 196 void PluginServiceImpl::StartWatchingPlugins() {
 197   // Start watching for changes in the plugin list. This means watching
 198   // for changes in the Windows registry keys and on both Windows and POSIX
 199   // watch for changes in the paths that are expected to contain plugins.
 200 #if defined(OS_WIN)
 201   if (hkcu_key_.Create(HKEY_CURRENT_USER,
 202                        kRegistryMozillaPlugins,
 203                        KEY_NOTIFY) == ERROR_SUCCESS) {
 204     base::win::RegKey::ChangeCallback callback =
 205         base::Bind(&PluginServiceImpl::OnKeyChanged, base::Unretained(this),
 206                    base::Unretained(&hkcu_key_));
 207     hkcu_key_.StartWatching(callback);
 208   }
 209   if (hklm_key_.Create(HKEY_LOCAL_MACHINE,
 210                        kRegistryMozillaPlugins,
 211                        KEY_NOTIFY) == ERROR_SUCCESS) {
 212     base::win::RegKey::ChangeCallback callback =
 213         base::Bind(&PluginServiceImpl::OnKeyChanged, base::Unretained(this),
 214                    base::Unretained(&hklm_key_));
 215     hklm_key_.StartWatching(callback);
 216   }
 217 #endif
 218 #if defined(OS_POSIX) && !defined(OS_OPENBSD) && !defined(OS_ANDROID)
 219 // On ChromeOS the user can't install plugins anyway and on Windows all
 220 // important plugins register themselves in the registry so no need to do that.
 221
 222   // Get the list of all paths for registering the FilePathWatchers
 223   // that will track and if needed reload the list of plugins on runtime.
 224   std::vector<base::FilePath> plugin_dirs;
 225   PluginList::Singleton()->GetPluginDirectories(&plugin_dirs);
 226
 227   for (size_t i = 0; i < plugin_dirs.size(); ++i) {
 228     // FilePathWatcher can not handle non-absolute paths under windows.
 229     // We don't watch for file changes in windows now but if this should ever
 230     // be extended to Windows these lines might save some time of debugging.
 231 #if defined(OS_WIN)
 232     if (!plugin_dirs[i].IsAbsolute())
 233       continue;
 234 #endif
 235     FilePathWatcher* watcher = new FilePathWatcher();
 236     VLOG(1) << "Watching for changes in: " << plugin_dirs[i].value();
 237     BrowserThread::PostTask(
 238         BrowserThread::FILE, FROM_HERE,
 239         base::Bind(&PluginServiceImpl::RegisterFilePathWatcher, watcher,
 240                    plugin_dirs[i]));
 241     file_watchers_.push_back(watcher);
 242   }
 243 #endif
 244 }
 245
 246 PluginProcessHost* PluginServiceImpl::FindNpapiPluginProcess(
 247     const base::FilePath& plugin_path) {
 248   for (PluginProcessHostIterator iter; !iter.Done(); ++iter) {
 249     if (iter->info().path == plugin_path)
 250       return *iter;
 251   }
 252
 253   return NULL;
 254 }
 255
 256 PpapiPluginProcessHost* PluginServiceImpl::FindPpapiPluginProcess(
 257     const base::FilePath& plugin_path,
 258     const base::FilePath& profile_data_directory) {
 259   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
 260     if (iter->plugin_path() == plugin_path &&
 261         iter->profile_data_directory() == profile_data_directory) {
 262       return *iter;
 263     }
 264   }
 265   return NULL;
 266 }
 267
 268 PpapiPluginProcessHost* PluginServiceImpl::FindPpapiBrokerProcess(
 269     const base::FilePath& broker_path) {
 270   for (PpapiBrokerProcessHostIterator iter; !iter.Done(); ++iter) {
 271     if (iter->plugin_path() == broker_path)
 272       return *iter;
 273   }
 274
 275   return NULL;
 276 }
 277
 278 PluginProcessHost* PluginServiceImpl::FindOrStartNpapiPluginProcess(
 279     int render_process_id,
 280     const base::FilePath& plugin_path) {
 281   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 282
 283   if (filter_ && !filter_->CanLoadPlugin(render_process_id, plugin_path))
 284     return NULL;
 285
 286   PluginProcessHost* plugin_host = FindNpapiPluginProcess(plugin_path);
 287   if (plugin_host)
 288     return plugin_host;
 289
 290   WebPluginInfo info;
 291   if (!GetPluginInfoByPath(plugin_path, &info)) {
 292     return NULL;
 293   }
 294
 295   // Record when NPAPI Flash process is started for the first time.
 296   static bool counted = false;
 297   if (!counted && base::UTF16ToUTF8(info.name) == kFlashPluginName) {
 298     counted = true;
 299     UMA_HISTOGRAM_ENUMERATION("Plugin.FlashUsage",
 300                               START_NPAPI_FLASH_AT_LEAST_ONCE,
 301                               FLASH_USAGE_ENUM_COUNT);
 302   }
 303 #if defined(OS_CHROMEOS)
 304   // TODO(ihf): Move to an earlier place once crbug.com/314301 is fixed. For now
 305   // we still want Plugin.FlashUsage recorded if we end up here.
 306   LOG(WARNING) << "Refusing to start npapi plugin on ChromeOS.";
 307   return NULL;
 308 #endif
 309   // This plugin isn't loaded by any plugin process, so create a new process.
 310   scoped_ptr<PluginProcessHost> new_host(new PluginProcessHost());
 311   if (!new_host->Init(info)) {
 312     NOTREACHED();  // Init is not expected to fail.
 313     return NULL;
 314   }
 315   return new_host.release();
 316 }
 317
 318 PpapiPluginProcessHost* PluginServiceImpl::FindOrStartPpapiPluginProcess(
 319     int render_process_id,
 320     const base::FilePath& plugin_path,
 321     const base::FilePath& profile_data_directory) {
 322   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 323
 324   if (filter_ && !filter_->CanLoadPlugin(render_process_id, plugin_path)) {
 325     VLOG(1) << "Unable to load ppapi plugin: " << plugin_path.MaybeAsASCII();
 326     return NULL;
 327   }
 328
 329   PpapiPluginProcessHost* plugin_host =
 330       FindPpapiPluginProcess(plugin_path, profile_data_directory);
 331   if (plugin_host)
 332     return plugin_host;
 333
 334   // Validate that the plugin is actually registered.
 335   PepperPluginInfo* info = GetRegisteredPpapiPluginInfo(plugin_path);
 336   if (!info) {
 337     VLOG(1) << "Unable to find ppapi plugin registration for: "
 338             << plugin_path.MaybeAsASCII();
 339     return NULL;
 340   }
 341
 342   // Record when PPAPI Flash process is started for the first time.
 343   static bool counted = false;
 344   if (!counted && info->name == kFlashPluginName) {
 345     counted = true;
 346     UMA_HISTOGRAM_ENUMERATION("Plugin.FlashUsage",
 347                               START_PPAPI_FLASH_AT_LEAST_ONCE,
 348                               FLASH_USAGE_ENUM_COUNT);
 349   }
 350
 351   // This plugin isn't loaded by any plugin process, so create a new process.
 352   plugin_host = PpapiPluginProcessHost::CreatePluginHost(
 353       *info, profile_data_directory);
 354   if (!plugin_host) {
 355     VLOG(1) << "Unable to create ppapi plugin process for: "
 356             << plugin_path.MaybeAsASCII();
 357   }
 358
 359   return plugin_host;
 360 }
 361
 362 PpapiPluginProcessHost* PluginServiceImpl::FindOrStartPpapiBrokerProcess(
 363     int render_process_id,
 364     const base::FilePath& plugin_path) {
 365   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 366
 367   if (filter_ && !filter_->CanLoadPlugin(render_process_id, plugin_path))
 368     return NULL;
 369
 370   PpapiPluginProcessHost* plugin_host = FindPpapiBrokerProcess(plugin_path);
 371   if (plugin_host)
 372     return plugin_host;
 373
 374   // Validate that the plugin is actually registered.
 375   PepperPluginInfo* info = GetRegisteredPpapiPluginInfo(plugin_path);
 376   if (!info)
 377     return NULL;
 378
 379   // TODO(ddorwin): Uncomment once out of process is supported.
 380   // DCHECK(info->is_out_of_process);
 381
 382   // This broker isn't loaded by any broker process, so create a new process.
 383   return PpapiPluginProcessHost::CreateBrokerHost(*info);
 384 }
 385
 386 void PluginServiceImpl::OpenChannelToNpapiPlugin(
 387     int render_process_id,
 388     int render_frame_id,
 389     const GURL& url,
 390     const GURL& page_url,
 391     const std::string& mime_type,
 392     PluginProcessHost::Client* client) {
 393   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 394   DCHECK(!ContainsKey(pending_plugin_clients_, client));
 395   pending_plugin_clients_.insert(client);
 396
 397   // Make sure plugins are loaded if necessary.
 398   PluginServiceFilterParams params = {
 399     render_process_id,
 400     render_frame_id,
 401     page_url,
 402     client->GetResourceContext()
 403   };
 404   GetPlugins(base::Bind(
 405       &PluginServiceImpl::ForwardGetAllowedPluginForOpenChannelToPlugin,
 406       base::Unretained(this), params, url, mime_type, client));
 407 }
 408
 409 void PluginServiceImpl::OpenChannelToPpapiPlugin(
 410     int render_process_id,
 411     const base::FilePath& plugin_path,
 412     const base::FilePath& profile_data_directory,
 413     PpapiPluginProcessHost::PluginClient* client) {
 414   PpapiPluginProcessHost* plugin_host = FindOrStartPpapiPluginProcess(
 415       render_process_id, plugin_path, profile_data_directory);
 416   if (plugin_host) {
 417     plugin_host->OpenChannelToPlugin(client);
 418   } else {
 419     // Send error.
 420     client->OnPpapiChannelOpened(IPC::ChannelHandle(), base::kNullProcessId, 0);
 421   }
 422 }
 423
 424 void PluginServiceImpl::OpenChannelToPpapiBroker(
 425     int render_process_id,
 426     const base::FilePath& path,
 427     PpapiPluginProcessHost::BrokerClient* client) {
 428   PpapiPluginProcessHost* plugin_host = FindOrStartPpapiBrokerProcess(
 429       render_process_id, path);
 430   if (plugin_host) {
 431     plugin_host->OpenChannelToPlugin(client);
 432   } else {
 433     // Send error.
 434     client->OnPpapiChannelOpened(IPC::ChannelHandle(), base::kNullProcessId, 0);
 435   }
 436 }
 437
 438 void PluginServiceImpl::CancelOpenChannelToNpapiPlugin(
 439     PluginProcessHost::Client* client) {
 440   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 441   DCHECK(ContainsKey(pending_plugin_clients_, client));
 442   pending_plugin_clients_.erase(client);
 443 }
 444
 445 void PluginServiceImpl::ForwardGetAllowedPluginForOpenChannelToPlugin(
 446     const PluginServiceFilterParams& params,
 447     const GURL& url,
 448     const std::string& mime_type,
 449     PluginProcessHost::Client* client,
 450     const std::vector<WebPluginInfo>&) {
 451   GetAllowedPluginForOpenChannelToPlugin(
 452       params.render_process_id, params.render_frame_id, url, params.page_url,
 453       mime_type, client, params.resource_context);
 454 }
 455
 456 void PluginServiceImpl::GetAllowedPluginForOpenChannelToPlugin(
 457     int render_process_id,
 458     int render_frame_id,
 459     const GURL& url,
 460     const GURL& page_url,
 461     const std::string& mime_type,
 462     PluginProcessHost::Client* client,
 463     ResourceContext* resource_context) {
 464   WebPluginInfo info;
 465   bool allow_wildcard = true;
 466   bool found = GetPluginInfo(
 467       render_process_id, render_frame_id, resource_context,
 468       url, page_url, mime_type, allow_wildcard,
 469       NULL, &info, NULL);
 470   base::FilePath plugin_path;
 471   if (found)
 472     plugin_path = info.path;
 473
 474   // Now we jump back to the IO thread to finish opening the channel.
 475   BrowserThread::PostTask(
 476       BrowserThread::IO, FROM_HERE,
 477       base::Bind(&PluginServiceImpl::FinishOpenChannelToPlugin,
 478                  base::Unretained(this),
 479                  render_process_id,
 480                  plugin_path,
 481                  client));
 482   if (filter_) {
 483     DCHECK_EQ(WebPluginInfo::PLUGIN_TYPE_NPAPI, info.type);
 484     filter_->NPAPIPluginLoaded(render_process_id, render_frame_id, mime_type,
 485                                info);
 486   }
 487 }
 488
 489 void PluginServiceImpl::FinishOpenChannelToPlugin(
 490     int render_process_id,
 491     const base::FilePath& plugin_path,
 492     PluginProcessHost::Client* client) {
 493   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 494
 495   // Make sure it hasn't been canceled yet.
 496   if (!ContainsKey(pending_plugin_clients_, client))
 497     return;
 498   pending_plugin_clients_.erase(client);
 499
 500   PluginProcessHost* plugin_host = FindOrStartNpapiPluginProcess(
 501       render_process_id, plugin_path);
 502   if (plugin_host) {
 503     client->OnFoundPluginProcessHost(plugin_host);
 504     plugin_host->OpenChannelToPlugin(client);
 505   } else {
 506     client->OnError();
 507   }
 508 }
 509
 510 bool PluginServiceImpl::GetPluginInfoArray(
 511     const GURL& url,
 512     const std::string& mime_type,
 513     bool allow_wildcard,
 514     std::vector<WebPluginInfo>* plugins,
 515     std::vector<std::string>* actual_mime_types) {
 516   bool use_stale = false;
 517   PluginList::Singleton()->GetPluginInfoArray(
 518       url, mime_type, allow_wildcard, &use_stale, NPAPIPluginsSupported(),
 519       plugins, actual_mime_types);
 520   return use_stale;
 521 }
 522
 523 bool PluginServiceImpl::GetPluginInfo(int render_process_id,
 524                                       int render_frame_id,
 525                                       ResourceContext* context,
 526                                       const GURL& url,
 527                                       const GURL& page_url,
 528                                       const std::string& mime_type,
 529                                       bool allow_wildcard,
 530                                       bool* is_stale,
 531                                       WebPluginInfo* info,
 532                                       std::string* actual_mime_type) {
 533   std::vector<WebPluginInfo> plugins;
 534   std::vector<std::string> mime_types;
 535   bool stale = GetPluginInfoArray(
 536       url, mime_type, allow_wildcard, &plugins, &mime_types);
 537   if (is_stale)
 538     *is_stale = stale;
 539
 540   for (size_t i = 0; i < plugins.size(); ++i) {
 541     if (!filter_ || filter_->IsPluginAvailable(render_process_id,
 542                                                render_frame_id,
 543                                                context,
 544                                                url,
 545                                                page_url,
 546                                                &plugins[i])) {
 547       *info = plugins[i];
 548       if (actual_mime_type)
 549         *actual_mime_type = mime_types[i];
 550       return true;
 551     }
 552   }
 553   return false;
 554 }
 555
 556 bool PluginServiceImpl::GetPluginInfoByPath(const base::FilePath& plugin_path,
 557                                             WebPluginInfo* info) {
 558   std::vector<WebPluginInfo> plugins;
 559   PluginList::Singleton()->GetPluginsNoRefresh(&plugins);
 560
 561   for (std::vector<WebPluginInfo>::iterator it = plugins.begin();
 562        it != plugins.end();
 563        ++it) {
 564     if (it->path == plugin_path) {
 565       *info = *it;
 566       return true;
 567     }
 568   }
 569
 570   return false;
 571 }
 572
 573 base::string16 PluginServiceImpl::GetPluginDisplayNameByPath(
 574     const base::FilePath& path) {
 575   base::string16 plugin_name = path.LossyDisplayName();
 576   WebPluginInfo info;
 577   if (PluginService::GetInstance()->GetPluginInfoByPath(path, &info) &&
 578       !info.name.empty()) {
 579     plugin_name = info.name;
 580 #if defined(OS_MACOSX)
 581     // Many plugins on the Mac have .plugin in the actual name, which looks
 582     // terrible, so look for that and strip it off if present.
 583     const std::string kPluginExtension = ".plugin";
 584     if (base::EndsWith(plugin_name, base::ASCIIToUTF16(kPluginExtension),
 585                        base::CompareCase::SENSITIVE))
 586       plugin_name.erase(plugin_name.length() - kPluginExtension.length());
 587 #endif  // OS_MACOSX
 588   }
 589   return plugin_name;
 590 }
 591
 592 void PluginServiceImpl::GetPlugins(const GetPluginsCallback& callback) {
 593   scoped_refptr<base::SingleThreadTaskRunner> target_task_runner(
 594       base::ThreadTaskRunnerHandle::Get());
 595
 596   if (LoadPluginListInProcess()) {
 597     BrowserThread::GetBlockingPool()
 598         ->PostSequencedWorkerTaskWithShutdownBehavior(
 599             plugin_list_token_, FROM_HERE,
 600             base::Bind(&PluginServiceImpl::GetPluginsInternal,
 601                        base::Unretained(this), target_task_runner, callback),
 602             base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 603     return;
 604   }
 605 #if defined(OS_POSIX)
 606   BrowserThread::PostTask(
 607       BrowserThread::IO, FROM_HERE,
 608       base::Bind(&PluginServiceImpl::GetPluginsOnIOThread,
 609                  base::Unretained(this), target_task_runner, callback));
 610 #else
 611   NOTREACHED();
 612 #endif
 613 }
 614
 615 void PluginServiceImpl::GetPluginsInternal(
 616     base::SingleThreadTaskRunner* target_task_runner,
 617     const PluginService::GetPluginsCallback& callback) {
 618   DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
 619       plugin_list_token_));
 620
 621   std::vector<WebPluginInfo> plugins;
 622   PluginList::Singleton()->GetPlugins(&plugins, NPAPIPluginsSupported());
 623
 624   target_task_runner->PostTask(FROM_HERE, base::Bind(callback, plugins));
 625 }
 626
 627 #if defined(OS_POSIX)
 628 void PluginServiceImpl::GetPluginsOnIOThread(
 629     base::SingleThreadTaskRunner* target_task_runner,
 630     const GetPluginsCallback& callback) {
 631   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 632
 633   // If we switch back to loading plugins in process, then we need to make
 634   // sure g_thread_init() gets called since plugins may call glib at load.
 635
 636   if (!plugin_loader_.get())
 637     plugin_loader_ = new PluginLoaderPosix;
 638
 639   plugin_loader_->GetPlugins(base::Bind(
 640       &ForwardCallback, make_scoped_refptr(target_task_runner), callback));
 641 }
 642 #endif
 643
 644 #if defined(OS_WIN)
 645 void PluginServiceImpl::OnKeyChanged(base::win::RegKey* key) {
 646   key->StartWatching(base::Bind(&PluginServiceImpl::OnKeyChanged,
 647                                 base::Unretained(this),
 648                                 base::Unretained(key)));
 649
 650   PluginList::Singleton()->RefreshPlugins();
 651   PurgePluginListCache(NULL, false);
 652 }
 653 #endif  // defined(OS_WIN)
 654
 655 void PluginServiceImpl::RegisterPepperPlugins() {
 656   ComputePepperPluginList(&ppapi_plugins_);
 657   for (size_t i = 0; i < ppapi_plugins_.size(); ++i) {
 658     RegisterInternalPlugin(ppapi_plugins_[i].ToWebPluginInfo(), true);
 659   }
 660 }
 661
 662 // There should generally be very few plugins so a brute-force search is fine.
 663 PepperPluginInfo* PluginServiceImpl::GetRegisteredPpapiPluginInfo(
 664     const base::FilePath& plugin_path) {
 665   PepperPluginInfo* info = NULL;
 666   for (size_t i = 0; i < ppapi_plugins_.size(); ++i) {
 667     if (ppapi_plugins_[i].path == plugin_path) {
 668       info = &ppapi_plugins_[i];
 669       break;
 670     }
 671   }
 672   if (info)
 673     return info;
 674   // We did not find the plugin in our list. But wait! the plugin can also
 675   // be a latecomer, as it happens with pepper flash. This information
 676   // can be obtained from the PluginList singleton and we can use it to
 677   // construct it and add it to the list. This same deal needs to be done
 678   // in the renderer side in PepperPluginRegistry.
 679   WebPluginInfo webplugin_info;
 680   if (!GetPluginInfoByPath(plugin_path, &webplugin_info))
 681     return NULL;
 682   PepperPluginInfo new_pepper_info;
 683   if (!MakePepperPluginInfo(webplugin_info, &new_pepper_info))
 684     return NULL;
 685   ppapi_plugins_.push_back(new_pepper_info);
 686   return &ppapi_plugins_[ppapi_plugins_.size() - 1];
 687 }
 688
 689 #if defined(OS_POSIX) && !defined(OS_OPENBSD) && !defined(OS_ANDROID)
 690 // static
 691 void PluginServiceImpl::RegisterFilePathWatcher(FilePathWatcher* watcher,
 692                                                 const base::FilePath& path) {
 693   bool result = watcher->Watch(path, false,
 694                                base::Bind(&NotifyPluginDirChanged));
 695   DCHECK(result);
 696 }
 697 #endif
 698
 699 void PluginServiceImpl::SetFilter(PluginServiceFilter* filter) {
 700   filter_ = filter;
 701 }
 702
 703 PluginServiceFilter* PluginServiceImpl::GetFilter() {
 704   return filter_;
 705 }
 706
 707 void PluginServiceImpl::ForcePluginShutdown(const base::FilePath& plugin_path) {
 708   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
 709     BrowserThread::PostTask(
 710         BrowserThread::IO, FROM_HERE,
 711         base::Bind(&PluginServiceImpl::ForcePluginShutdown,
 712                    base::Unretained(this), plugin_path));
 713     return;
 714   }
 715
 716   PluginProcessHost* plugin = FindNpapiPluginProcess(plugin_path);
 717   if (plugin)
 718     plugin->ForceShutdown();
 719 }
 720
 721 static const unsigned int kMaxCrashesPerInterval = 3;
 722 static const unsigned int kCrashesInterval = 120;
 723
 724 void PluginServiceImpl::RegisterPluginCrash(const base::FilePath& path) {
 725   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 726   std::map<base::FilePath, std::vector<base::Time> >::iterator i =
 727       crash_times_.find(path);
 728   if (i == crash_times_.end()) {
 729     crash_times_[path] = std::vector<base::Time>();
 730     i = crash_times_.find(path);
 731   }
 732   if (i->second.size() == kMaxCrashesPerInterval) {
 733     i->second.erase(i->second.begin());
 734   }
 735   base::Time time = base::Time::Now();
 736   i->second.push_back(time);
 737 }
 738
 739 bool PluginServiceImpl::IsPluginUnstable(const base::FilePath& path) {
 740   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 741   std::map<base::FilePath, std::vector<base::Time> >::const_iterator i =
 742       crash_times_.find(path);
 743   if (i == crash_times_.end()) {
 744     return false;
 745   }
 746   if (i->second.size() != kMaxCrashesPerInterval) {
 747     return false;
 748   }
 749   base::TimeDelta delta = base::Time::Now() - i->second[0];
 750   return delta.InSeconds() <= kCrashesInterval;
 751 }
 752
 753 void PluginServiceImpl::RefreshPlugins() {
 754   PluginList::Singleton()->RefreshPlugins();
 755 }
 756
 757 void PluginServiceImpl::AddExtraPluginPath(const base::FilePath& path) {
 758   if (!NPAPIPluginsSupported()) {
 759     // TODO(jam): remove and just have CHECK once we're sure this doesn't get
 760     // triggered.
 761     DVLOG(0) << "NPAPI plugins not supported";
 762     return;
 763   }
 764   PluginList::Singleton()->AddExtraPluginPath(path);
 765 }
 766
 767 void PluginServiceImpl::RemoveExtraPluginPath(const base::FilePath& path) {
 768   PluginList::Singleton()->RemoveExtraPluginPath(path);
 769 }
 770
 771 void PluginServiceImpl::AddExtraPluginDir(const base::FilePath& path) {
 772   PluginList::Singleton()->AddExtraPluginDir(path);
 773 }
 774
 775 void PluginServiceImpl::RegisterInternalPlugin(
 776     const WebPluginInfo& info,
 777     bool add_at_beginning) {
 778   // Internal plugins should never be NPAPI.
 779   CHECK_NE(info.type, WebPluginInfo::PLUGIN_TYPE_NPAPI);
 780   if (info.type == WebPluginInfo::PLUGIN_TYPE_NPAPI) {
 781     DVLOG(0) << "Don't register NPAPI plugins when they're not supported";
 782     return;
 783   }
 784   PluginList::Singleton()->RegisterInternalPlugin(info, add_at_beginning);
 785 }
 786
 787 void PluginServiceImpl::UnregisterInternalPlugin(const base::FilePath& path) {
 788   PluginList::Singleton()->UnregisterInternalPlugin(path);
 789 }
 790
 791 void PluginServiceImpl::GetInternalPlugins(
 792     std::vector<WebPluginInfo>* plugins) {
 793   PluginList::Singleton()->GetInternalPlugins(plugins);
 794 }
 795
 796 bool PluginServiceImpl::NPAPIPluginsSupported() {
 797 #if defined(OS_WIN) || defined(OS_MACOSX)
 798   npapi_plugins_enabled_ = GetContentClient()->browser()->IsNPAPIEnabled();
 799 #if defined(OS_WIN)
 800   // NPAPI plugins don't play well with Win32k renderer lockdown.
 801   if (npapi_plugins_enabled_)
 802     DisableWin32kRendererLockdown();
 803 #endif
 804   NPAPIPluginStatus status =
 805       npapi_plugins_enabled_ ? NPAPI_STATUS_ENABLED : NPAPI_STATUS_DISABLED;
 806 #else
 807   NPAPIPluginStatus status = NPAPI_STATUS_UNSUPPORTED;
 808 #endif
 809   UMA_HISTOGRAM_ENUMERATION("Plugin.NPAPIStatus", status,
 810                             NPAPI_STATUS_ENUM_COUNT);
 811
 812   return npapi_plugins_enabled_;
 813 }
 814
 815 void PluginServiceImpl::DisablePluginsDiscoveryForTesting() {
 816   PluginList::Singleton()->DisablePluginsDiscovery();
 817 }
 818
 819 #if defined(OS_MACOSX)
 820 void PluginServiceImpl::AppActivated() {
 821   BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
 822                           base::Bind(&NotifyPluginsOfActivation));
 823 }
 824 #elif defined(OS_WIN)
 825
 826 bool GetPluginPropertyFromWindow(
 827     HWND window, const wchar_t* plugin_atom_property,
 828     base::string16* plugin_property) {
 829   ATOM plugin_atom = static_cast<ATOM>(
 830       reinterpret_cast<uintptr_t>(GetPropW(window, plugin_atom_property)));
 831   if (plugin_atom != 0) {
 832     WCHAR plugin_property_local[MAX_PATH] = {0};
 833     GlobalGetAtomNameW(plugin_atom,
 834                        plugin_property_local,
 835                        ARRAYSIZE(plugin_property_local));
 836     *plugin_property = plugin_property_local;
 837     return true;
 838   }
 839   return false;
 840 }
 841
 842 bool PluginServiceImpl::GetPluginInfoFromWindow(
 843     HWND window,
 844     base::string16* plugin_name,
 845     base::string16* plugin_version) {
 846   if (!IsPluginWindow(window))
 847     return false;
 848
 849
 850   DWORD process_id = 0;
 851   GetWindowThreadProcessId(window, &process_id);
 852   WebPluginInfo info;
 853   if (!PluginProcessHost::GetWebPluginInfoFromPluginPid(process_id, &info))
 854     return false;
 855
 856   *plugin_name = info.name;
 857   *plugin_version = info.version;
 858   return true;
 859 }
 860
 861 bool PluginServiceImpl::IsPluginWindow(HWND window) {
 862   return gfx::GetClassName(window) == base::string16(kNativeWindowClassName);
 863 }
 864 #endif
 865
 866 bool PluginServiceImpl::PpapiDevChannelSupported(
 867     BrowserContext* browser_context,
 868     const GURL& document_url) {
 869   return GetContentClient()->browser()->IsPluginAllowedToUseDevChannelAPIs(
 870       browser_context, document_url);
 871 }
 872
 873 }  // namespace content