chrome/browser/search_engines/search_provider_install_data.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/search_engines/search_provider_install_data.h"
   6
   7 #include <algorithm>
   8 #include <functional>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/bind.h"
  13 #include "base/bind_helpers.h"
  14 #include "base/logging.h"
  15 #include "base/memory/ref_counted.h"
  16 #include "base/sequenced_task_runner_helpers.h"
  17 #include "components/google/core/browser/google_url_tracker.h"
  18 #include "components/search_engines/search_host_to_urls_map.h"
  19 #include "components/search_engines/search_terms_data.h"
  20 #include "components/search_engines/template_url.h"
  21 #include "components/search_engines/template_url_service.h"
  22 #include "components/search_engines/util.h"
  23 #include "content/public/browser/browser_thread.h"
  24 #include "content/public/browser/render_process_host.h"
  25 #include "content/public/browser/render_process_host_observer.h"
  26
  27 using content::BrowserThread;
  28
  29 typedef SearchHostToURLsMap::TemplateURLSet TemplateURLSet;
  30
  31 namespace {
  32
  33 void LoadDataOnUIThread(TemplateURLService* template_url_service,
  34                         const base::Callback<void(ScopedVector<TemplateURL>,
  35                                                   TemplateURL*)>& callback) {
  36   ScopedVector<TemplateURL> template_url_copies;
  37   TemplateURL* default_provider_copy = NULL;
  38   TemplateURLService::TemplateURLVector original_template_urls =
  39       template_url_service->GetTemplateURLs();
  40   TemplateURL* original_default_provider =
  41       template_url_service->GetDefaultSearchProvider();
  42   for (TemplateURLService::TemplateURLVector::const_iterator it =
  43            original_template_urls.begin();
  44        it != original_template_urls.end();
  45        ++it) {
  46     template_url_copies.push_back(new TemplateURL((*it)->data()));
  47     if (*it == original_default_provider)
  48       default_provider_copy = template_url_copies.back();
  49   }
  50   BrowserThread::PostTask(BrowserThread::IO,
  51                           FROM_HERE,
  52                           base::Bind(callback,
  53                                      base::Passed(template_url_copies.Pass()),
  54                                      base::Unretained(default_provider_copy)));
  55 }
  56
  57 // Implementation of SearchTermsData that may be used on the I/O thread.
  58 class IOThreadSearchTermsData : public SearchTermsData {
  59  public:
  60   explicit IOThreadSearchTermsData(const std::string& google_base_url);
  61
  62   // Implementation of SearchTermsData.
  63   std::string GoogleBaseURLValue() const override;
  64
  65  private:
  66   std::string google_base_url_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(IOThreadSearchTermsData);
  69 };
  70
  71 IOThreadSearchTermsData::IOThreadSearchTermsData(
  72     const std::string& google_base_url) : google_base_url_(google_base_url) {
  73 }
  74
  75 std::string IOThreadSearchTermsData::GoogleBaseURLValue() const {
  76   return google_base_url_;
  77 }
  78
  79 // Handles telling SearchProviderInstallData about changes to the google base
  80 // url. (Ensure that this is deleted on the I/O thread so that the WeakPtr is
  81 // deleted on the correct thread.)
  82 class GoogleURLChangeNotifier
  83     : public base::RefCountedThreadSafe<GoogleURLChangeNotifier,
  84                                         BrowserThread::DeleteOnIOThread> {
  85  public:
  86   explicit GoogleURLChangeNotifier(
  87       const base::WeakPtr<SearchProviderInstallData>& install_data);
  88
  89   // Called on the I/O thread with the Google base URL whenever the value
  90   // changes.
  91   void OnChange(const std::string& google_base_url);
  92
  93  private:
  94   friend struct BrowserThread::DeleteOnThread<BrowserThread::IO>;
  95   friend class base::DeleteHelper<GoogleURLChangeNotifier>;
  96
  97   ~GoogleURLChangeNotifier() {}
  98
  99   base::WeakPtr<SearchProviderInstallData> install_data_;
 100
 101   DISALLOW_COPY_AND_ASSIGN(GoogleURLChangeNotifier);
 102 };
 103
 104 GoogleURLChangeNotifier::GoogleURLChangeNotifier(
 105     const base::WeakPtr<SearchProviderInstallData>& install_data)
 106     : install_data_(install_data) {
 107 }
 108
 109 void GoogleURLChangeNotifier::OnChange(const std::string& google_base_url) {
 110   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 111   if (install_data_.get())
 112     install_data_->OnGoogleURLChange(google_base_url);
 113 }
 114
 115 // Notices changes in the Google base URL and sends them along
 116 // to the SearchProviderInstallData on the I/O thread.
 117 class GoogleURLObserver : public content::RenderProcessHostObserver {
 118  public:
 119   GoogleURLObserver(GoogleURLTracker* google_url_tracker,
 120                     GoogleURLChangeNotifier* change_notifier,
 121                     content::RenderProcessHost* host);
 122
 123   // Implementation of content::RenderProcessHostObserver.
 124   void RenderProcessHostDestroyed(content::RenderProcessHost* host) override;
 125
 126  private:
 127   ~GoogleURLObserver() override {}
 128
 129   // Callback that is called when the Google URL is updated.
 130   void OnGoogleURLUpdated();
 131
 132   GoogleURLTracker* google_url_tracker_;
 133   scoped_refptr<GoogleURLChangeNotifier> change_notifier_;
 134
 135   scoped_ptr<GoogleURLTracker::Subscription> google_url_updated_subscription_;
 136
 137   DISALLOW_COPY_AND_ASSIGN(GoogleURLObserver);
 138 };
 139
 140 GoogleURLObserver::GoogleURLObserver(
 141     GoogleURLTracker* google_url_tracker,
 142     GoogleURLChangeNotifier* change_notifier,
 143     content::RenderProcessHost* host)
 144     : google_url_tracker_(google_url_tracker),
 145       change_notifier_(change_notifier) {
 146   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 147   google_url_updated_subscription_ =
 148       google_url_tracker_->RegisterCallback(base::Bind(
 149           &GoogleURLObserver::OnGoogleURLUpdated, base::Unretained(this)));
 150   host->AddObserver(this);
 151 }
 152
 153 void GoogleURLObserver::OnGoogleURLUpdated() {
 154   BrowserThread::PostTask(BrowserThread::IO,
 155                           FROM_HERE,
 156                           base::Bind(&GoogleURLChangeNotifier::OnChange,
 157                                      change_notifier_.get(),
 158                                      google_url_tracker_->google_url().spec()));
 159 }
 160
 161 void GoogleURLObserver::RenderProcessHostDestroyed(
 162     content::RenderProcessHost* host) {
 163   delete this;
 164 }
 165
 166 // Indicates if the two inputs have the same security origin.
 167 // |requested_origin| should only be a security origin (no path, etc.).
 168 // It is ok if |template_url| is NULL.
 169 static bool IsSameOrigin(const GURL& requested_origin,
 170                          TemplateURL* template_url,
 171                          const SearchTermsData& search_terms_data) {
 172   DCHECK(requested_origin == requested_origin.GetOrigin());
 173   DCHECK(template_url->GetType() != TemplateURL::OMNIBOX_API_EXTENSION);
 174   return requested_origin ==
 175       template_url->GenerateSearchURL(search_terms_data).GetOrigin();
 176 }
 177
 178 }  // namespace
 179
 180 SearchProviderInstallData::SearchProviderInstallData(
 181     TemplateURLService* template_url_service,
 182     const std::string& google_base_url,
 183     GoogleURLTracker* google_url_tracker,
 184     content::RenderProcessHost* host)
 185     : template_url_service_(template_url_service),
 186       google_base_url_(google_base_url),
 187       weak_factory_(this) {
 188   // GoogleURLTracker is not created in tests.
 189   if (google_url_tracker) {
 190     // GoogleURLObserver is responsible for killing itself when
 191     // the given notification occurs.
 192     new GoogleURLObserver(
 193         google_url_tracker,
 194         new GoogleURLChangeNotifier(weak_factory_.GetWeakPtr()),
 195         host);
 196   }
 197 }
 198
 199 SearchProviderInstallData::~SearchProviderInstallData() {
 200   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 201 }
 202
 203 void SearchProviderInstallData::CallWhenLoaded(const base::Closure& closure) {
 204   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 205
 206   if (provider_map_.get()) {
 207     closure.Run();
 208     return;
 209   }
 210
 211   bool do_load = closure_queue_.empty();
 212   closure_queue_.push_back(closure);
 213
 214   // If the queue wasn't empty, there was already a load in progress.
 215   if (!do_load)
 216     return;
 217
 218   if (template_url_service_) {
 219     BrowserThread::PostTask(
 220         BrowserThread::UI,
 221         FROM_HERE,
 222         base::Bind(&LoadDataOnUIThread,
 223                    template_url_service_,
 224                    base::Bind(&SearchProviderInstallData::OnTemplateURLsLoaded,
 225                               weak_factory_.GetWeakPtr())));
 226   } else {
 227     OnLoadFailed();
 228   }
 229 }
 230
 231 SearchProviderInstallData::State SearchProviderInstallData::GetInstallState(
 232     const GURL& requested_origin) {
 233   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 234   DCHECK(provider_map_.get());
 235
 236   // First check to see if the origin is the default search provider.
 237   if (requested_origin.spec() == default_search_origin_)
 238     return INSTALLED_AS_DEFAULT;
 239
 240   // Is the url any search provider?
 241   const TemplateURLSet* urls = provider_map_->GetURLsForHost(
 242       requested_origin.host());
 243   if (!urls)
 244     return NOT_INSTALLED;
 245
 246   IOThreadSearchTermsData search_terms_data(google_base_url_);
 247   for (TemplateURLSet::const_iterator i = urls->begin();
 248        i != urls->end(); ++i) {
 249     if (IsSameOrigin(requested_origin, *i, search_terms_data))
 250       return INSTALLED_BUT_NOT_DEFAULT;
 251   }
 252   return NOT_INSTALLED;
 253 }
 254
 255 void SearchProviderInstallData::OnGoogleURLChange(
 256     const std::string& google_base_url) {
 257   google_base_url_ = google_base_url;
 258 }
 259
 260 void SearchProviderInstallData::OnTemplateURLsLoaded(
 261     ScopedVector<TemplateURL> template_urls,
 262     TemplateURL* default_provider) {
 263   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 264
 265   template_urls_ = template_urls.Pass();
 266
 267   IOThreadSearchTermsData search_terms_data(google_base_url_);
 268   provider_map_.reset(new SearchHostToURLsMap());
 269   provider_map_->Init(template_urls_.get(), search_terms_data);
 270   SetDefault(default_provider);
 271   NotifyLoaded();
 272 }
 273
 274 void SearchProviderInstallData::SetDefault(const TemplateURL* template_url) {
 275   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 276
 277   if (!template_url) {
 278     default_search_origin_.clear();
 279     return;
 280   }
 281
 282   DCHECK(template_url->GetType() != TemplateURL::OMNIBOX_API_EXTENSION);
 283
 284   IOThreadSearchTermsData search_terms_data(google_base_url_);
 285   const GURL url(template_url->GenerateSearchURL(search_terms_data));
 286   if (!url.is_valid() || !url.has_host()) {
 287     default_search_origin_.clear();
 288     return;
 289   }
 290   default_search_origin_ = url.GetOrigin().spec();
 291 }
 292
 293 void SearchProviderInstallData::OnLoadFailed() {
 294   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 295
 296   provider_map_.reset(new SearchHostToURLsMap());
 297   IOThreadSearchTermsData search_terms_data(google_base_url_);
 298   provider_map_->Init(template_urls_.get(), search_terms_data);
 299   SetDefault(NULL);
 300   NotifyLoaded();
 301 }
 302
 303 void SearchProviderInstallData::NotifyLoaded() {
 304   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 305
 306   std::vector<base::Closure> closure_queue;
 307   closure_queue.swap(closure_queue_);
 308
 309   std::for_each(closure_queue.begin(),
 310                 closure_queue.end(),
 311                 std::mem_fun_ref(&base::Closure::Run));
 312
 313   // Since we expect this request to be rare, clear out the information. This
 314   // also keeps the responses current as the search providers change.
 315   provider_map_.reset();
 316   SetDefault(NULL);
 317 }