chrome/browser/extensions/extension_keybinding_registry.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 "chrome/browser/extensions/extension_keybinding_registry.h"
   6
   7 #include "base/values.h"
   8 #include "chrome/browser/chrome_notification_types.h"
   9 #include "chrome/browser/extensions/active_tab_permission_granter.h"
  10 #include "chrome/browser/extensions/extension_service.h"
  11 #include "chrome/browser/profiles/profile.h"
  12 #include "chrome/common/extensions/command.h"
  13 #include "content/public/browser/browser_context.h"
  14 #include "extensions/browser/event_router.h"
  15 #include "extensions/browser/extension_registry.h"
  16 #include "extensions/browser/extension_system.h"
  17 #include "extensions/common/extension_set.h"
  18 #include "extensions/common/manifest_constants.h"
  19
  20 namespace extensions {
  21
  22 ExtensionKeybindingRegistry::ExtensionKeybindingRegistry(
  23     content::BrowserContext* context,
  24     ExtensionFilter extension_filter,
  25     Delegate* delegate)
  26     : browser_context_(context),
  27       extension_filter_(extension_filter),
  28       delegate_(delegate),
  29       extension_registry_observer_(this) {
  30   extension_registry_observer_.Add(ExtensionRegistry::Get(browser_context_));
  31
  32   Profile* profile = Profile::FromBrowserContext(browser_context_);
  33   registrar_.Add(this,
  34                  chrome::NOTIFICATION_EXTENSION_COMMAND_ADDED,
  35                  content::Source<Profile>(profile->GetOriginalProfile()));
  36   registrar_.Add(this,
  37                  chrome::NOTIFICATION_EXTENSION_COMMAND_REMOVED,
  38                  content::Source<Profile>(profile->GetOriginalProfile()));
  39 }
  40
  41 ExtensionKeybindingRegistry::~ExtensionKeybindingRegistry() {
  42 }
  43
  44 void ExtensionKeybindingRegistry::RemoveExtensionKeybinding(
  45     const Extension* extension,
  46     const std::string& command_name) {
  47   EventTargets::iterator it = event_targets_.begin();
  48   while (it != event_targets_.end()) {
  49     TargetList& target_list = it->second;
  50     TargetList::iterator target = target_list.begin();
  51     while (target != target_list.end()) {
  52       if (target->first == extension->id() &&
  53           (command_name.empty() || command_name == target->second))
  54         target = target_list.erase(target);
  55       else
  56         target++;
  57     }
  58
  59     EventTargets::iterator old = it++;
  60     if (target_list.empty()) {
  61       // Let each platform-specific implementation get a chance to clean up.
  62       RemoveExtensionKeybindingImpl(old->first, command_name);
  63       event_targets_.erase(old);
  64
  65       // If a specific command_name was requested, it has now been deleted so no
  66       // further work is required.
  67       if (!command_name.empty())
  68         break;
  69     }
  70   }
  71 }
  72
  73 void ExtensionKeybindingRegistry::Init() {
  74   ExtensionService* service =
  75       ExtensionSystem::Get(browser_context_)->extension_service();
  76   if (!service)
  77     return;  // ExtensionService can be null during testing.
  78
  79   const ExtensionSet* extensions = service->extensions();
  80   ExtensionSet::const_iterator iter = extensions->begin();
  81   for (; iter != extensions->end(); ++iter)
  82     if (ExtensionMatchesFilter(iter->get()))
  83       AddExtensionKeybinding(iter->get(), std::string());
  84 }
  85
  86 bool ExtensionKeybindingRegistry::ShouldIgnoreCommand(
  87     const std::string& command) const {
  88   return command == manifest_values::kPageActionCommandEvent ||
  89          command == manifest_values::kBrowserActionCommandEvent;
  90 }
  91
  92 bool ExtensionKeybindingRegistry::NotifyEventTargets(
  93     const ui::Accelerator& accelerator) {
  94   return ExecuteCommands(accelerator, std::string());
  95 }
  96
  97 void ExtensionKeybindingRegistry::CommandExecuted(
  98     const std::string& extension_id, const std::string& command) {
  99   ExtensionService* service =
 100       ExtensionSystem::Get(browser_context_)->extension_service();
 101
 102   const Extension* extension = service->extensions()->GetByID(extension_id);
 103   if (!extension)
 104     return;
 105
 106   // Grant before sending the event so that the permission is granted before
 107   // the extension acts on the command. NOTE: The Global Commands handler does
 108   // not set the delegate as it deals only with named commands (not page/browser
 109   // actions that are associated with the current page directly).
 110   ActiveTabPermissionGranter* granter =
 111       delegate_ ? delegate_->GetActiveTabPermissionGranter() : NULL;
 112   if (granter)
 113     granter->GrantIfRequested(extension);
 114
 115   scoped_ptr<base::ListValue> args(new base::ListValue());
 116   args->Append(new base::StringValue(command));
 117
 118   scoped_ptr<Event> event(new Event("commands.onCommand", args.Pass()));
 119   event->restrict_to_browser_context = browser_context_;
 120   event->user_gesture = EventRouter::USER_GESTURE_ENABLED;
 121   EventRouter::Get(browser_context_)
 122       ->DispatchEventToExtension(extension_id, event.Pass());
 123 }
 124
 125 bool ExtensionKeybindingRegistry::IsAcceleratorRegistered(
 126     const ui::Accelerator& accelerator) const {
 127   return event_targets_.find(accelerator) != event_targets_.end();
 128 }
 129
 130 void ExtensionKeybindingRegistry::AddEventTarget(
 131     const ui::Accelerator& accelerator,
 132     const std::string& extension_id,
 133     const std::string& command_name) {
 134   event_targets_[accelerator].push_back(
 135       std::make_pair(extension_id, command_name));
 136   // Shortcuts except media keys have only one target in the list. See comment
 137   // about |event_targets_|.
 138   if (!extensions::Command::IsMediaKey(accelerator))
 139     DCHECK_EQ(1u, event_targets_[accelerator].size());
 140 }
 141
 142 bool ExtensionKeybindingRegistry::GetFirstTarget(
 143     const ui::Accelerator& accelerator,
 144     std::string* extension_id,
 145     std::string* command_name) const {
 146   EventTargets::const_iterator targets = event_targets_.find(accelerator);
 147   if (targets == event_targets_.end())
 148     return false;
 149
 150   DCHECK(!targets->second.empty());
 151   TargetList::const_iterator first_target = targets->second.begin();
 152   *extension_id = first_target->first;
 153   *command_name = first_target->second;
 154   return true;
 155 }
 156
 157 bool ExtensionKeybindingRegistry::IsEventTargetsEmpty() const {
 158   return event_targets_.empty();
 159 }
 160
 161 void ExtensionKeybindingRegistry::ExecuteCommand(
 162     const std::string& extension_id,
 163     const ui::Accelerator& accelerator) {
 164   ExecuteCommands(accelerator, extension_id);
 165 }
 166
 167 void ExtensionKeybindingRegistry::OnExtensionLoaded(
 168     content::BrowserContext* browser_context,
 169     const Extension* extension) {
 170   if (ExtensionMatchesFilter(extension))
 171     AddExtensionKeybinding(extension, std::string());
 172 }
 173
 174 void ExtensionKeybindingRegistry::OnExtensionUnloaded(
 175     content::BrowserContext* browser_context,
 176     const Extension* extension,
 177     UnloadedExtensionInfo::Reason reason) {
 178   if (ExtensionMatchesFilter(extension))
 179     RemoveExtensionKeybinding(extension, std::string());
 180 }
 181
 182 void ExtensionKeybindingRegistry::Observe(
 183     int type,
 184     const content::NotificationSource& source,
 185     const content::NotificationDetails& details) {
 186   switch (type) {
 187     case chrome::NOTIFICATION_EXTENSION_COMMAND_ADDED:
 188     case chrome::NOTIFICATION_EXTENSION_COMMAND_REMOVED: {
 189       std::pair<const std::string, const std::string>* payload =
 190           content::Details<std::pair<const std::string, const std::string> >(
 191               details).ptr();
 192
 193       const Extension* extension = ExtensionSystem::Get(browser_context_)
 194                                        ->extension_service()
 195                                        ->extensions()
 196                                        ->GetByID(payload->first);
 197       // During install and uninstall the extension won't be found. We'll catch
 198       // those events above, with the LOADED/UNLOADED, so we ignore this event.
 199       if (!extension)
 200         return;
 201
 202       if (ExtensionMatchesFilter(extension)) {
 203         if (type == chrome::NOTIFICATION_EXTENSION_COMMAND_ADDED)
 204           AddExtensionKeybinding(extension, payload->second);
 205         else
 206           RemoveExtensionKeybinding(extension, payload->second);
 207       }
 208       break;
 209     }
 210     default:
 211       NOTREACHED();
 212       break;
 213   }
 214 }
 215
 216 bool ExtensionKeybindingRegistry::ExtensionMatchesFilter(
 217     const extensions::Extension* extension)
 218 {
 219   switch (extension_filter_) {
 220     case ALL_EXTENSIONS:
 221       return true;
 222     case PLATFORM_APPS_ONLY:
 223       return extension->is_platform_app();
 224     default:
 225       NOTREACHED();
 226   }
 227   return false;
 228 }
 229
 230 bool ExtensionKeybindingRegistry::ExecuteCommands(
 231     const ui::Accelerator& accelerator,
 232     const std::string& extension_id) {
 233   EventTargets::iterator targets = event_targets_.find(accelerator);
 234   if (targets == event_targets_.end() || targets->second.empty())
 235     return false;
 236
 237   bool executed = false;
 238   for (TargetList::const_iterator it = targets->second.begin();
 239        it != targets->second.end(); it++) {
 240     if (extension_id.empty() || it->first == extension_id) {
 241       CommandExecuted(it->first, it->second);
 242       executed = true;
 243     }
 244   }
 245
 246   return executed;
 247 }
 248
 249 }  // namespace extensions