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      1 // Copyright 2014 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 "chrome/browser/extensions/chrome_process_manager_delegate.h"
      6 
      7 #include "base/command_line.h"
      8 #include "base/logging.h"
      9 #include "chrome/browser/browser_process.h"
     10 #include "chrome/browser/chrome_notification_types.h"
     11 #include "chrome/browser/profiles/profile.h"
     12 #include "chrome/browser/profiles/profile_manager.h"
     13 #include "chrome/browser/ui/browser.h"
     14 #include "chrome/browser/ui/browser_finder.h"
     15 #include "chrome/common/chrome_switches.h"
     16 #include "content/public/browser/notification_service.h"
     17 #include "extensions/browser/extension_system.h"
     18 #include "extensions/browser/process_manager.h"
     19 #include "extensions/common/one_shot_event.h"
     20 
     21 namespace extensions {
     22 
     23 ChromeProcessManagerDelegate::ChromeProcessManagerDelegate() {
     24   registrar_.Add(this,
     25                  chrome::NOTIFICATION_BROWSER_WINDOW_READY,
     26                  content::NotificationService::AllSources());
     27   registrar_.Add(this,
     28                  chrome::NOTIFICATION_PROFILE_CREATED,
     29                  content::NotificationService::AllSources());
     30   registrar_.Add(this,
     31                  chrome::NOTIFICATION_PROFILE_DESTROYED,
     32                  content::NotificationService::AllSources());
     33 }
     34 
     35 ChromeProcessManagerDelegate::~ChromeProcessManagerDelegate() {
     36 }
     37 
     38 bool ChromeProcessManagerDelegate::IsBackgroundPageAllowed(
     39     content::BrowserContext* context) const {
     40   Profile* profile = static_cast<Profile*>(context);
     41 
     42   // Disallow if the current session is a Guest mode session but the current
     43   // browser context is *not* off-the-record. Such context is artificial and
     44   // background page shouldn't be created in it.
     45   // http://crbug.com/329498
     46   return !(profile->IsGuestSession() && !profile->IsOffTheRecord());
     47 }
     48 
     49 bool ChromeProcessManagerDelegate::DeferCreatingStartupBackgroundHosts(
     50     content::BrowserContext* context) const {
     51   Profile* profile = static_cast<Profile*>(context);
     52 
     53   // The profile may not be valid yet if it is still being initialized.
     54   // In that case, defer loading, since it depends on an initialized profile.
     55   // Background hosts will be loaded later via NOTIFICATION_PROFILE_CREATED.
     56   // http://crbug.com/222473
     57   if (!g_browser_process->profile_manager()->IsValidProfile(profile))
     58     return true;
     59 
     60   // There are no browser windows open and the browser process was
     61   // started to show the app launcher. Background hosts will be loaded later
     62   // via NOTIFICATION_BROWSER_WINDOW_READY. http://crbug.com/178260
     63   return chrome::GetTotalBrowserCountForProfile(profile) == 0 &&
     64          CommandLine::ForCurrentProcess()->HasSwitch(switches::kShowAppList);
     65 }
     66 
     67 void ChromeProcessManagerDelegate::Observe(
     68     int type,
     69     const content::NotificationSource& source,
     70     const content::NotificationDetails& details) {
     71   switch (type) {
     72     case chrome::NOTIFICATION_BROWSER_WINDOW_READY: {
     73       Browser* browser = content::Source<Browser>(source).ptr();
     74       OnBrowserWindowReady(browser);
     75       break;
     76     }
     77     case chrome::NOTIFICATION_PROFILE_CREATED: {
     78       Profile* profile = content::Source<Profile>(source).ptr();
     79       OnProfileCreated(profile);
     80       break;
     81     }
     82     case chrome::NOTIFICATION_PROFILE_DESTROYED: {
     83       Profile* profile = content::Source<Profile>(source).ptr();
     84       OnProfileDestroyed(profile);
     85       break;
     86     }
     87     default:
     88       NOTREACHED();
     89   }
     90 }
     91 
     92 void ChromeProcessManagerDelegate::OnBrowserWindowReady(Browser* browser) {
     93   Profile* profile = browser->profile();
     94   DCHECK(profile);
     95 
     96   // If the extension system isn't ready yet the background hosts will be
     97   // created automatically when it is.
     98   ExtensionSystem* system = ExtensionSystem::Get(profile);
     99   if (!system->ready().is_signaled())
    100     return;
    101 
    102   // Inform the process manager for this profile that the window is ready.
    103   // We continue to observe the notification in case browser windows open for
    104   // a related incognito profile or other regular profiles.
    105   ProcessManager* manager = system->process_manager();
    106   if (!manager)  // Tests may not have a process manager.
    107     return;
    108   DCHECK_EQ(profile, manager->GetBrowserContext());
    109   manager->MaybeCreateStartupBackgroundHosts();
    110 
    111   // For incognito profiles also inform the original profile's process manager
    112   // that the window is ready. This will usually be a no-op because the
    113   // original profile's process manager should have been informed when the
    114   // non-incognito window opened.
    115   if (profile->IsOffTheRecord()) {
    116     Profile* original_profile = profile->GetOriginalProfile();
    117     ProcessManager* original_manager =
    118         ExtensionSystem::Get(original_profile)->process_manager();
    119     DCHECK(original_manager);
    120     DCHECK_EQ(original_profile, original_manager->GetBrowserContext());
    121     original_manager->MaybeCreateStartupBackgroundHosts();
    122   }
    123 }
    124 
    125 void ChromeProcessManagerDelegate::OnProfileCreated(Profile* profile) {
    126   // Incognito profiles are handled by their original profile.
    127   if (profile->IsOffTheRecord())
    128     return;
    129 
    130   // The profile can be created before the extension system is ready.
    131   ProcessManager* manager = ExtensionSystem::Get(profile)->process_manager();
    132   if (!manager)
    133     return;
    134 
    135   // The profile might have been initialized asynchronously (in parallel with
    136   // extension system startup). Now that initialization is complete the
    137   // ProcessManager can load deferred background pages.
    138   manager->MaybeCreateStartupBackgroundHosts();
    139 }
    140 
    141 void ChromeProcessManagerDelegate::OnProfileDestroyed(Profile* profile) {
    142   // Close background hosts when the last profile is closed so that they
    143   // have time to shutdown various objects on different threads. The
    144   // ProfileManager destructor is called too late in the shutdown sequence.
    145   // http://crbug.com/15708
    146   ProcessManager* manager = ExtensionSystem::Get(profile)->process_manager();
    147   if (manager)
    148     manager->CloseBackgroundHosts();
    149 
    150   // If this profile owns an incognito profile, but it is destroyed before the
    151   // incognito profile is destroyed, then close the incognito background hosts
    152   // as well. This happens in a few tests. http://crbug.com/138843
    153   if (!profile->IsOffTheRecord() && profile->HasOffTheRecordProfile()) {
    154     ProcessManager* incognito_manager =
    155         ExtensionSystem::Get(profile->GetOffTheRecordProfile())
    156             ->process_manager();
    157     if (incognito_manager)
    158       incognito_manager->CloseBackgroundHosts();
    159   }
    160 }
    161 
    162 }  // namespace extensions
    163