chrome/browser/autocomplete/extension_app_provider.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/autocomplete/extension_app_provider.h"
   6
   7 #include <algorithm>
   8 #include <cmath>
   9
  10 #include "base/strings/string16.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "chrome/browser/chrome_notification_types.h"
  13 #include "chrome/browser/extensions/extension_service.h"
  14 #include "chrome/browser/extensions/extension_util.h"
  15 #include "chrome/browser/history/history_service.h"
  16 #include "chrome/browser/history/history_service_factory.h"
  17 #include "chrome/browser/history/url_database.h"
  18 #include "chrome/browser/profiles/profile.h"
  19 #include "chrome/browser/ui/extensions/application_launch.h"
  20 #include "chrome/browser/ui/webui/ntp/core_app_launcher_handler.h"
  21 #include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
  22 #include "content/public/browser/notification_source.h"
  23 #include "extensions/browser/extension_registry.h"
  24 #include "extensions/browser/extension_system.h"
  25 #include "extensions/common/extension.h"
  26 #include "extensions/common/extension_set.h"
  27 #include "ui/base/l10n/l10n_util.h"
  28
  29 ExtensionAppProvider::ExtensionAppProvider(
  30     AutocompleteProviderListener* listener,
  31     Profile* profile)
  32     : AutocompleteProvider(listener, profile,
  33           AutocompleteProvider::TYPE_EXTENSION_APP) {
  34   // Notifications of extensions loading and unloading always come from the
  35   // non-incognito profile, but we need to see them regardless, as the incognito
  36   // windows can be affected.
  37   registrar_.Add(this,
  38                  chrome::NOTIFICATION_EXTENSION_LOADED_DEPRECATED,
  39                  content::Source<Profile>(profile_->GetOriginalProfile()));
  40   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNINSTALLED,
  41                  content::Source<Profile>(profile_->GetOriginalProfile()));
  42   RefreshAppList();
  43 }
  44
  45 // static.
  46 void ExtensionAppProvider::LaunchAppFromOmnibox(
  47     const AutocompleteMatch& match,
  48     Profile* profile,
  49     WindowOpenDisposition disposition) {
  50   const extensions::Extension* extension =
  51       extensions::ExtensionRegistry::Get(profile)
  52           ->enabled_extensions().GetAppByURL(match.destination_url);
  53   // While the Omnibox popup is open, the extension can be updated, changing
  54   // its URL and leaving us with no extension being found. In this case, we
  55   // ignore the request.
  56   if (!extension)
  57     return;
  58
  59   CoreAppLauncherHandler::RecordAppLaunchType(
  60       extension_misc::APP_LAUNCH_OMNIBOX_APP,
  61       extension->GetType());
  62
  63   OpenApplication(AppLaunchParams(profile, extension, disposition));
  64 }
  65
  66 void ExtensionAppProvider::AddExtensionAppForTesting(
  67     const ExtensionApp& extension_app) {
  68   extension_apps_.push_back(extension_app);
  69 }
  70
  71 AutocompleteMatch ExtensionAppProvider::CreateAutocompleteMatch(
  72     const AutocompleteInput& input,
  73     const ExtensionApp& app,
  74     size_t name_match_index,
  75     size_t url_match_index) {
  76   // TODO(finnur): Figure out what type to return here, might want to have
  77   // the extension icon/a generic icon show up in the Omnibox.
  78   AutocompleteMatch match(this, 0, false,
  79                           AutocompleteMatchType::EXTENSION_APP);
  80   match.fill_into_edit =
  81       app.should_match_against_launch_url ? app.launch_url : input.text();
  82   match.destination_url = GURL(app.launch_url);
  83   match.allowed_to_be_default_match = true;
  84   match.contents = AutocompleteMatch::SanitizeString(app.name);
  85   AutocompleteMatch::ClassifyLocationInString(name_match_index,
  86       input.text().length(), app.name.length(), ACMatchClassification::NONE,
  87       &match.contents_class);
  88   if (app.should_match_against_launch_url) {
  89     match.description = app.launch_url;
  90     AutocompleteMatch::ClassifyLocationInString(url_match_index,
  91         input.text().length(), app.launch_url.length(),
  92         ACMatchClassification::URL, &match.description_class);
  93   }
  94   match.relevance = CalculateRelevance(
  95       input.type(),
  96       input.text().length(),
  97       name_match_index != base::string16::npos ?
  98           app.name.length() : app.launch_url.length(),
  99       match.destination_url);
 100   return match;
 101 }
 102
 103 void ExtensionAppProvider::Start(const AutocompleteInput& input,
 104                                  bool minimal_changes) {
 105   matches_.clear();
 106
 107   if ((input.type() == AutocompleteInput::INVALID) ||
 108       (input.type() == AutocompleteInput::FORCED_QUERY))
 109     return;
 110
 111   if (input.text().empty())
 112     return;
 113
 114   for (ExtensionApps::const_iterator app = extension_apps_.begin();
 115        app != extension_apps_.end(); ++app) {
 116     // See if the input matches this extension application.
 117     const base::string16& name = app->name;
 118     base::string16::const_iterator name_iter =
 119         std::search(name.begin(), name.end(),
 120                     input.text().begin(), input.text().end(),
 121                     base::CaseInsensitiveCompare<base::char16>());
 122     bool matches_name = name_iter != name.end();
 123     size_t name_match_index = matches_name ?
 124         static_cast<size_t>(name_iter - name.begin()) : base::string16::npos;
 125
 126     bool matches_url = false;
 127     size_t url_match_index = base::string16::npos;
 128     if (app->should_match_against_launch_url) {
 129       const base::string16& url = app->launch_url;
 130       base::string16::const_iterator url_iter =
 131           std::search(url.begin(), url.end(),
 132                       input.text().begin(), input.text().end(),
 133                       base::CaseInsensitiveCompare<base::char16>());
 134       matches_url = url_iter != url.end() &&
 135           input.type() != AutocompleteInput::FORCED_QUERY;
 136       url_match_index = matches_url ?
 137           static_cast<size_t>(url_iter - url.begin()) : base::string16::npos;
 138     }
 139
 140     if (matches_name || matches_url) {
 141       // We have a match, might be a partial match.
 142       matches_.push_back(CreateAutocompleteMatch(
 143           input, *app, name_match_index, url_match_index));
 144     }
 145   }
 146 }
 147
 148 ExtensionAppProvider::~ExtensionAppProvider() {
 149 }
 150
 151 void ExtensionAppProvider::RefreshAppList() {
 152   ExtensionService* extension_service =
 153       extensions::ExtensionSystem::Get(profile_)->extension_service();
 154   if (!extension_service)
 155     return;  // During testing, there is no extension service.
 156   const extensions::ExtensionSet* extensions = extension_service->extensions();
 157   extension_apps_.clear();
 158   for (extensions::ExtensionSet::const_iterator iter = extensions->begin();
 159        iter != extensions->end(); ++iter) {
 160     const extensions::Extension* app = iter->get();
 161     if (!app->ShouldDisplayInAppLauncher())
 162       continue;
 163     // Note: Apps that appear in the NTP only are not added here since this
 164     // provider is currently only used in the app launcher.
 165
 166     if (profile_->IsOffTheRecord() &&
 167         !extensions::util::CanLoadInIncognito(app, profile_))
 168       continue;
 169
 170     GURL launch_url = app->is_platform_app() ?
 171         app->url() : extensions::AppLaunchInfo::GetFullLaunchURL(app);
 172     DCHECK(launch_url.is_valid());
 173
 174     ExtensionApp extension_app = {
 175         base::UTF8ToUTF16(app->name()),
 176         base::UTF8ToUTF16(launch_url.spec()),
 177         // Only hosted apps have recognizable URLs that users might type in,
 178         // packaged apps and hosted apps use chrome-extension:// URLs that are
 179         // normally not shown to users.
 180         app->is_hosted_app()
 181     };
 182     extension_apps_.push_back(extension_app);
 183   }
 184 }
 185
 186 void ExtensionAppProvider::Observe(int type,
 187                                    const content::NotificationSource& source,
 188                                    const content::NotificationDetails& details) {
 189   RefreshAppList();
 190 }
 191
 192 int ExtensionAppProvider::CalculateRelevance(AutocompleteInput::Type type,
 193                                              int input_length,
 194                                              int target_length,
 195                                              const GURL& url) {
 196   // If you update the algorithm here, please remember to update the tables in
 197   // autocomplete.h also.
 198   const int kMaxRelevance = 1425;
 199
 200   if (input_length == target_length)
 201     return kMaxRelevance;
 202
 203   // We give a boost proportionally based on how much of the input matches the
 204   // app name, up to a maximum close to 200 (we can be close to, but we'll never
 205   // reach 200 because the 100% match is taken care of above).
 206   double fraction_boost = static_cast<double>(200) *
 207                           input_length / target_length;
 208
 209   // We also give a boost relative to how often the user has previously typed
 210   // the Extension App URL/selected the Extension App suggestion from this
 211   // provider (boost is between 200-400).
 212   double type_count_boost = 0;
 213   HistoryService* const history_service =
 214       HistoryServiceFactory::GetForProfile(profile_, Profile::EXPLICIT_ACCESS);
 215   history::URLDatabase* url_db = history_service ?
 216       history_service->InMemoryDatabase() : NULL;
 217   if (url_db) {
 218     history::URLRow info;
 219     url_db->GetRowForURL(url, &info);
 220     type_count_boost =
 221         400 * (1.0 - (std::pow(static_cast<double>(2), -info.typed_count())));
 222   }
 223   int relevance = 575 + static_cast<int>(type_count_boost) +
 224                         static_cast<int>(fraction_boost);
 225   DCHECK_LE(relevance, kMaxRelevance);
 226   return relevance;
 227 }