components/search_engines/template_url_fetcher.cc

   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 "build/build_config.h"
   6
   7 #include "components/search_engines/template_url_fetcher.h"
   8
   9 #include "base/strings/string_number_conversions.h"
  10 #include "base/strings/utf_string_conversions.h"
  11 #include "components/search_engines/template_url.h"
  12 #include "components/search_engines/template_url_parser.h"
  13 #include "components/search_engines/template_url_service.h"
  14 #include "net/base/load_flags.h"
  15 #include "net/url_request/url_fetcher.h"
  16 #include "net/url_request/url_fetcher_delegate.h"
  17 #include "net/url_request/url_request_context_getter.h"
  18 #include "net/url_request/url_request_status.h"
  19
  20 // RequestDelegate ------------------------------------------------------------
  21 class TemplateURLFetcher::RequestDelegate : public net::URLFetcherDelegate {
  22  public:
  23   RequestDelegate(
  24       TemplateURLFetcher* fetcher,
  25       const base::string16& keyword,
  26       const GURL& osdd_url,
  27       const GURL& favicon_url,
  28       const URLFetcherCustomizeCallback& url_fetcher_customize_callback,
  29       const ConfirmAddSearchProviderCallback& confirm_add_callback,
  30       ProviderType provider_type);
  31
  32   // net::URLFetcherDelegate:
  33   // If data contains a valid OSDD, a TemplateURL is created and added to
  34   // the TemplateURLService.
  35   void OnURLFetchComplete(const net::URLFetcher* source) override;
  36
  37   // URL of the OSDD.
  38   GURL url() const { return osdd_url_; }
  39
  40   // Keyword to use.
  41   base::string16 keyword() const { return keyword_; }
  42
  43   // The type of search provider being fetched.
  44   ProviderType provider_type() const { return provider_type_; }
  45
  46  private:
  47   void OnLoaded();
  48   void AddSearchProvider();
  49
  50   scoped_ptr<net::URLFetcher> url_fetcher_;
  51   TemplateURLFetcher* fetcher_;
  52   scoped_ptr<TemplateURL> template_url_;
  53   base::string16 keyword_;
  54   const GURL osdd_url_;
  55   const GURL favicon_url_;
  56   const ProviderType provider_type_;
  57   ConfirmAddSearchProviderCallback confirm_add_callback_;
  58
  59   scoped_ptr<TemplateURLService::Subscription> template_url_subscription_;
  60
  61   DISALLOW_COPY_AND_ASSIGN(RequestDelegate);
  62 };
  63
  64 TemplateURLFetcher::RequestDelegate::RequestDelegate(
  65     TemplateURLFetcher* fetcher,
  66     const base::string16& keyword,
  67     const GURL& osdd_url,
  68     const GURL& favicon_url,
  69     const URLFetcherCustomizeCallback& url_fetcher_customize_callback,
  70     const ConfirmAddSearchProviderCallback& confirm_add_callback,
  71     ProviderType provider_type)
  72     : url_fetcher_(net::URLFetcher::Create(
  73           osdd_url, net::URLFetcher::GET, this)),
  74       fetcher_(fetcher),
  75       keyword_(keyword),
  76       osdd_url_(osdd_url),
  77       favicon_url_(favicon_url),
  78       provider_type_(provider_type),
  79       confirm_add_callback_(confirm_add_callback) {
  80   TemplateURLService* model = fetcher_->template_url_service_;
  81   DCHECK(model);  // TemplateURLFetcher::ScheduleDownload verifies this.
  82
  83   if (!model->loaded()) {
  84     // Start the model load and set-up waiting for it.
  85     template_url_subscription_ = model->RegisterOnLoadedCallback(
  86         base::Bind(&TemplateURLFetcher::RequestDelegate::OnLoaded,
  87                    base::Unretained(this)));
  88     model->Load();
  89   }
  90
  91   if (!url_fetcher_customize_callback.is_null())
  92     url_fetcher_customize_callback.Run(url_fetcher_.get());
  93
  94   url_fetcher_->SetRequestContext(fetcher->request_context_.get());
  95   url_fetcher_->Start();
  96 }
  97
  98 void TemplateURLFetcher::RequestDelegate::OnLoaded() {
  99   template_url_subscription_.reset();
 100   if (!template_url_.get())
 101     return;
 102   AddSearchProvider();
 103   // WARNING: AddSearchProvider deletes us.
 104 }
 105
 106 void TemplateURLFetcher::RequestDelegate::OnURLFetchComplete(
 107     const net::URLFetcher* source) {
 108   // Validation checks.
 109   // Make sure we can still replace the keyword, i.e. the fetch was successful.
 110   // If the OSDD file was loaded HTTP, we also have to check the response_code.
 111   // For other schemes, e.g. when the OSDD file is bundled with an extension,
 112   // the response_code is not applicable and should be -1. Also, ensure that
 113   // the returned information results in a valid search URL.
 114   std::string data;
 115   if (!source->GetStatus().is_success() ||
 116       ((source->GetResponseCode() != -1) &&
 117         (source->GetResponseCode() != 200)) ||
 118       !source->GetResponseAsString(&data)) {
 119     fetcher_->RequestCompleted(this);
 120     // WARNING: RequestCompleted deletes us.
 121     return;
 122   }
 123
 124   template_url_.reset(TemplateURLParser::Parse(
 125       fetcher_->template_url_service_->search_terms_data(), false,
 126       data.data(), data.length(), NULL));
 127   if (!template_url_.get() ||
 128       !template_url_->url_ref().SupportsReplacement(
 129           fetcher_->template_url_service_->search_terms_data())) {
 130     fetcher_->RequestCompleted(this);
 131     // WARNING: RequestCompleted deletes us.
 132     return;
 133   }
 134
 135   if (provider_type_ != AUTODETECTED_PROVIDER || keyword_.empty()) {
 136     // Use the parser-generated new keyword from the URL in the OSDD for the
 137     // non-autodetected case.  The existing |keyword_| was generated from the
 138     // URL that hosted the OSDD, which results in the wrong keyword when the
 139     // OSDD was located on a third-party site that has nothing in common with
 140     // search engine described by OSDD.
 141     keyword_ = template_url_->keyword();
 142     DCHECK(!keyword_.empty());
 143   }
 144
 145   // Wait for the model to be loaded before adding the provider.
 146   if (!fetcher_->template_url_service_->loaded())
 147     return;
 148   AddSearchProvider();
 149   // WARNING: AddSearchProvider deletes us.
 150 }
 151
 152 void TemplateURLFetcher::RequestDelegate::AddSearchProvider() {
 153   DCHECK(template_url_.get());
 154   DCHECK(!keyword_.empty());
 155   TemplateURLService* model = fetcher_->template_url_service_;
 156   DCHECK(model);
 157   DCHECK(model->loaded());
 158
 159   TemplateURL* existing_url = NULL;
 160   if (model->CanReplaceKeyword(keyword_, GURL(template_url_->url()),
 161                                &existing_url)) {
 162     if (existing_url)
 163       model->Remove(existing_url);
 164   } else if (provider_type_ == AUTODETECTED_PROVIDER) {
 165     fetcher_->RequestCompleted(this);  // WARNING: Deletes us!
 166     return;
 167   }
 168
 169   // The short name is what is shown to the user. We preserve original names
 170   // since it is better when generated keyword in many cases.
 171   TemplateURLData data(template_url_->data());
 172   data.SetKeyword(keyword_);
 173   data.originating_url = osdd_url_;
 174
 175   // The page may have specified a URL to use for favicons, if not, set it.
 176   if (!data.favicon_url.is_valid())
 177     data.favicon_url = favicon_url_;
 178
 179   switch (provider_type_) {
 180     case AUTODETECTED_PROVIDER:
 181       // Mark the keyword as replaceable so it can be removed if necessary.
 182       data.safe_for_autoreplace = true;
 183       model->Add(new TemplateURL(data));
 184       break;
 185
 186     case EXPLICIT_PROVIDER:
 187       // Confirm addition and allow user to edit default choices. It's ironic
 188       // that only *non*-autodetected additions get confirmed, but the user
 189       // expects feedback that his action did something.
 190       // The source WebContents' delegate takes care of adding the URL to the
 191       // model, which takes ownership, or of deleting it if the add is
 192       // cancelled.
 193       confirm_add_callback_.Run(make_scoped_ptr(new TemplateURL(data)));
 194       break;
 195
 196     default:
 197       NOTREACHED();
 198       break;
 199   }
 200
 201   fetcher_->RequestCompleted(this);
 202   // WARNING: RequestCompleted deletes us.
 203 }
 204
 205 // TemplateURLFetcher ---------------------------------------------------------
 206
 207 TemplateURLFetcher::TemplateURLFetcher(
 208     TemplateURLService* template_url_service,
 209     net::URLRequestContextGetter* request_context)
 210     : template_url_service_(template_url_service),
 211       request_context_(request_context) {
 212 }
 213
 214 TemplateURLFetcher::~TemplateURLFetcher() {
 215 }
 216
 217 void TemplateURLFetcher::ScheduleDownload(
 218     const base::string16& keyword,
 219     const GURL& osdd_url,
 220     const GURL& favicon_url,
 221     const URLFetcherCustomizeCallback& url_fetcher_customize_callback,
 222     const ConfirmAddSearchProviderCallback& confirm_add_callback,
 223     ProviderType provider_type) {
 224   DCHECK(osdd_url.is_valid());
 225
 226   // For a JS-added OSDD, the provided keyword is irrelevant because we will
 227   // generate a keyword later from the OSDD content.  For the autodetected case,
 228   // we need a valid keyword up front.
 229   if (provider_type == TemplateURLFetcher::AUTODETECTED_PROVIDER) {
 230     DCHECK(!keyword.empty());
 231
 232     if (!template_url_service_->loaded()) {
 233       // We could try to set up a callback to this function again once the model
 234       // is loaded but since this is an auto-add case anyway, meh.
 235       template_url_service_->Load();
 236       return;
 237     }
 238
 239     const TemplateURL* template_url =
 240         template_url_service_->GetTemplateURLForKeyword(keyword);
 241     if (template_url && (!template_url->safe_for_autoreplace() ||
 242                          template_url->originating_url() == osdd_url))
 243       return;
 244   }
 245
 246   // Make sure we aren't already downloading this request.
 247   for (Requests::iterator i = requests_.begin(); i != requests_.end(); ++i) {
 248     if (((*i)->url() == osdd_url) ||
 249         ((provider_type == TemplateURLFetcher::AUTODETECTED_PROVIDER) &&
 250          ((*i)->keyword() == keyword)))
 251       return;
 252   }
 253
 254   requests_.push_back(new RequestDelegate(
 255       this, keyword, osdd_url, favicon_url, url_fetcher_customize_callback,
 256       confirm_add_callback, provider_type));
 257 }
 258
 259 void TemplateURLFetcher::RequestCompleted(RequestDelegate* request) {
 260   Requests::iterator i =
 261       std::find(requests_.begin(), requests_.end(), request);
 262   DCHECK(i != requests_.end());
 263   requests_.weak_erase(i);
 264   delete request;
 265 }