src/chrome/browser/ui/browser_navigator.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/ui/browser_navigator.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/command_line.h"
  10 #include "base/prefs/pref_service.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "chrome/browser/browser_about_handler.h"
  14 #include "chrome/browser/chrome_notification_types.h"
  15 #include "chrome/browser/extensions/tab_helper.h"
  16 #include "chrome/browser/prefs/incognito_mode_prefs.h"
  17 #include "chrome/browser/prerender/prerender_manager.h"
  18 #include "chrome/browser/prerender/prerender_manager_factory.h"
  19 #include "chrome/browser/prerender/prerender_util.h"
  20 #include "chrome/browser/profiles/profile.h"
  21 #include "chrome/browser/tab_contents/tab_util.h"
  22 #include "chrome/browser/ui/browser.h"
  23 #include "chrome/browser/ui/browser_finder.h"
  24 #include "chrome/browser/ui/browser_instant_controller.h"
  25 #include "chrome/browser/ui/browser_window.h"
  26 #include "chrome/browser/ui/host_desktop.h"
  27 #include "chrome/browser/ui/location_bar/location_bar.h"
  28 #include "chrome/browser/ui/search/instant_search_prerenderer.h"
  29 #include "chrome/browser/ui/singleton_tabs.h"
  30 #include "chrome/browser/ui/status_bubble.h"
  31 #include "chrome/browser/ui/tab_helpers.h"
  32 #include "chrome/browser/ui/tabs/tab_strip_model.h"
  33 #include "chrome/browser/web_applications/web_app.h"
  34 #include "chrome/common/pref_names.h"
  35 #include "chrome/common/url_constants.h"
  36 #include "components/google/core/browser/google_url_tracker.h"
  37 #include "content/public/browser/browser_url_handler.h"
  38 #include "content/public/browser/navigation_entry.h"
  39 #include "content/public/browser/notification_service.h"
  40 #include "content/public/browser/render_view_host.h"
  41 #include "content/public/browser/web_contents.h"
  42
  43 #if defined(USE_ASH)
  44 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
  45 #endif
  46
  47 #if defined(USE_AURA)
  48 #include "ui/aura/window.h"
  49 #endif
  50
  51 #if defined(ENABLE_EXTENSIONS)
  52 #include "extensions/browser/extension_registry.h"
  53 #include "extensions/common/extension.h"
  54 #include "extensions/common/extension_set.h"
  55 #endif
  56
  57 using content::GlobalRequestID;
  58 using content::NavigationController;
  59 using content::WebContents;
  60
  61 class BrowserNavigatorWebContentsAdoption {
  62  public:
  63   static void AttachTabHelpers(content::WebContents* contents) {
  64     TabHelpers::AttachTabHelpers(contents);
  65   }
  66 };
  67
  68 namespace {
  69
  70 // Returns true if the specified Browser can open tabs. Not all Browsers support
  71 // multiple tabs, such as app frames and popups. This function returns false for
  72 // those types of Browser.
  73 bool WindowCanOpenTabs(Browser* browser) {
  74   return browser->CanSupportWindowFeature(Browser::FEATURE_TABSTRIP) ||
  75       browser->tab_strip_model()->empty();
  76 }
  77
  78 // Finds an existing Browser compatible with |profile|, making a new one if no
  79 // such Browser is located.
  80 Browser* GetOrCreateBrowser(Profile* profile,
  81                             chrome::HostDesktopType host_desktop_type) {
  82   Browser* browser = chrome::FindTabbedBrowser(profile, false,
  83                                                host_desktop_type);
  84   return browser ? browser : new Browser(
  85       Browser::CreateParams(profile, host_desktop_type));
  86 }
  87
  88 // Change some of the navigation parameters based on the particular URL.
  89 // Currently this applies to some chrome:// pages which we always want to open
  90 // in a non-incognito window. Note that even though a ChromeOS guest session is
  91 // technically an incognito window, these URLs are allowed.
  92 // Returns true on success. Otherwise, if changing params leads the browser into
  93 // an erroneous state, returns false.
  94 bool AdjustNavigateParamsForURL(chrome::NavigateParams* params) {
  95   if (params->target_contents != NULL ||
  96       chrome::IsURLAllowedInIncognito(params->url,
  97                                       params->initiating_profile) ||
  98       params->initiating_profile->IsGuestSession()) {
  99     return true;
 100   }
 101
 102   Profile* profile = params->initiating_profile;
 103
 104   if (profile->IsOffTheRecord() || params->disposition == OFF_THE_RECORD) {
 105     profile = profile->GetOriginalProfile();
 106
 107     // If incognito is forced, we punt.
 108     PrefService* prefs = profile->GetPrefs();
 109     if (prefs && IncognitoModePrefs::GetAvailability(prefs) ==
 110             IncognitoModePrefs::FORCED) {
 111       return false;
 112     }
 113
 114     params->disposition = SINGLETON_TAB;
 115     params->browser = GetOrCreateBrowser(profile, params->host_desktop_type);
 116     params->window_action = chrome::NavigateParams::SHOW_WINDOW;
 117   }
 118
 119   return true;
 120 }
 121
 122 // Returns a Browser that can host the navigation or tab addition specified in
 123 // |params|. This might just return the same Browser specified in |params|, or
 124 // some other if that Browser is deemed incompatible.
 125 Browser* GetBrowserForDisposition(chrome::NavigateParams* params) {
 126   // If no source WebContents was specified, we use the selected one from
 127   // the target browser. This must happen first, before
 128   // GetBrowserForDisposition() has a chance to replace |params->browser| with
 129   // another one.
 130   if (!params->source_contents && params->browser) {
 131     params->source_contents =
 132         params->browser->tab_strip_model()->GetActiveWebContents();
 133   }
 134
 135   Profile* profile = params->initiating_profile;
 136
 137   switch (params->disposition) {
 138     case CURRENT_TAB:
 139       if (params->browser)
 140         return params->browser;
 141       // Find a compatible window and re-execute this command in it. Otherwise
 142       // re-run with NEW_WINDOW.
 143       return GetOrCreateBrowser(profile, params->host_desktop_type);
 144     case SINGLETON_TAB:
 145     case NEW_FOREGROUND_TAB:
 146     case NEW_BACKGROUND_TAB:
 147       // See if we can open the tab in the window this navigator is bound to.
 148       if (params->browser && WindowCanOpenTabs(params->browser))
 149         return params->browser;
 150       // Find a compatible window and re-execute this command in it. Otherwise
 151       // re-run with NEW_WINDOW.
 152       return GetOrCreateBrowser(profile, params->host_desktop_type);
 153     case NEW_POPUP: {
 154       // Make a new popup window.
 155       // Coerce app-style if |source| represents an app.
 156       std::string app_name;
 157       if (!params->extension_app_id.empty()) {
 158         app_name = web_app::GenerateApplicationNameFromExtensionId(
 159             params->extension_app_id);
 160       } else if (params->browser && !params->browser->app_name().empty()) {
 161         app_name = params->browser->app_name();
 162       } else if (params->source_contents) {
 163         extensions::TabHelper* extensions_tab_helper =
 164             extensions::TabHelper::FromWebContents(params->source_contents);
 165         if (extensions_tab_helper && extensions_tab_helper->is_app()) {
 166           app_name = web_app::GenerateApplicationNameFromExtensionId(
 167               extensions_tab_helper->extension_app()->id());
 168         }
 169       }
 170       if (app_name.empty()) {
 171         Browser::CreateParams browser_params(
 172             Browser::TYPE_POPUP, profile, params->host_desktop_type);
 173         browser_params.trusted_source = params->trusted_source;
 174         browser_params.initial_bounds = params->window_bounds;
 175         return new Browser(browser_params);
 176       }
 177
 178       return new Browser(Browser::CreateParams::CreateForApp(
 179           app_name,
 180           params->trusted_source,
 181           params->window_bounds,
 182           profile,
 183           params->host_desktop_type));
 184     }
 185     case NEW_WINDOW: {
 186       // Make a new normal browser window.
 187       return new Browser(Browser::CreateParams(profile,
 188                                                params->host_desktop_type));
 189     }
 190     case OFF_THE_RECORD:
 191       // Make or find an incognito window.
 192       return GetOrCreateBrowser(profile->GetOffTheRecordProfile(),
 193                                 params->host_desktop_type);
 194     // The following types all result in no navigation.
 195     case SUPPRESS_OPEN:
 196     case SAVE_TO_DISK:
 197     case IGNORE_ACTION:
 198       return NULL;
 199     default:
 200       NOTREACHED();
 201   }
 202   return NULL;
 203 }
 204
 205 // Fix disposition and other parameter values depending on prevailing
 206 // conditions.
 207 void NormalizeDisposition(chrome::NavigateParams* params) {
 208   // Calculate the WindowOpenDisposition if necessary.
 209   if (params->browser->tab_strip_model()->empty() &&
 210       (params->disposition == NEW_BACKGROUND_TAB ||
 211        params->disposition == CURRENT_TAB ||
 212        params->disposition == SINGLETON_TAB)) {
 213     params->disposition = NEW_FOREGROUND_TAB;
 214   }
 215   if (params->browser->profile()->IsOffTheRecord() &&
 216       params->disposition == OFF_THE_RECORD) {
 217     params->disposition = NEW_FOREGROUND_TAB;
 218   }
 219   if (!params->source_contents && params->disposition == CURRENT_TAB)
 220     params->disposition = NEW_FOREGROUND_TAB;
 221
 222   switch (params->disposition) {
 223     case NEW_BACKGROUND_TAB:
 224       // Disposition trumps add types. ADD_ACTIVE is a default, so we need to
 225       // remove it if disposition implies the tab is going to open in the
 226       // background.
 227       params->tabstrip_add_types &= ~TabStripModel::ADD_ACTIVE;
 228       break;
 229
 230     case NEW_WINDOW:
 231     case NEW_POPUP:
 232       // Code that wants to open a new window typically expects it to be shown
 233       // automatically.
 234       if (params->window_action == chrome::NavigateParams::NO_ACTION)
 235         params->window_action = chrome::NavigateParams::SHOW_WINDOW;
 236       // Fall-through.
 237     case NEW_FOREGROUND_TAB:
 238     case SINGLETON_TAB:
 239       params->tabstrip_add_types |= TabStripModel::ADD_ACTIVE;
 240       break;
 241
 242     default:
 243       break;
 244   }
 245 }
 246
 247 // Obtain the profile used by the code that originated the Navigate() request.
 248 Profile* GetSourceProfile(chrome::NavigateParams* params) {
 249   if (params->source_contents) {
 250     return Profile::FromBrowserContext(
 251         params->source_contents->GetBrowserContext());
 252   }
 253
 254   return params->initiating_profile;
 255 }
 256
 257 void LoadURLInContents(WebContents* target_contents,
 258                        const GURL& url,
 259                        chrome::NavigateParams* params) {
 260   NavigationController::LoadURLParams load_url_params(url);
 261   load_url_params.referrer = params->referrer;
 262   load_url_params.frame_tree_node_id = params->frame_tree_node_id;
 263   load_url_params.redirect_chain = params->redirect_chain;
 264   load_url_params.transition_type = params->transition;
 265   load_url_params.extra_headers = params->extra_headers;
 266   load_url_params.should_replace_current_entry =
 267       params->should_replace_current_entry;
 268
 269   if (params->transferred_global_request_id != GlobalRequestID()) {
 270     load_url_params.is_renderer_initiated = params->is_renderer_initiated;
 271     load_url_params.transferred_global_request_id =
 272         params->transferred_global_request_id;
 273   } else if (params->is_renderer_initiated) {
 274     load_url_params.is_renderer_initiated = true;
 275   }
 276
 277   // Only allows the browser-initiated navigation to use POST.
 278   if (params->uses_post && !params->is_renderer_initiated) {
 279     load_url_params.load_type =
 280         NavigationController::LOAD_TYPE_BROWSER_INITIATED_HTTP_POST;
 281     load_url_params.browser_initiated_post_data =
 282         params->browser_initiated_post_data;
 283   }
 284   target_contents->GetController().LoadURLWithParams(load_url_params);
 285 }
 286
 287 // This class makes sure the Browser object held in |params| is made visible
 288 // by the time it goes out of scope, provided |params| wants it to be shown.
 289 class ScopedBrowserShower {
 290  public:
 291   explicit ScopedBrowserShower(chrome::NavigateParams* params)
 292       : params_(params) {
 293   }
 294   ~ScopedBrowserShower() {
 295     if (params_->window_action == chrome::NavigateParams::SHOW_WINDOW_INACTIVE)
 296       params_->browser->window()->ShowInactive();
 297     else if (params_->window_action == chrome::NavigateParams::SHOW_WINDOW)
 298       params_->browser->window()->Show();
 299   }
 300  private:
 301   chrome::NavigateParams* params_;
 302   DISALLOW_COPY_AND_ASSIGN(ScopedBrowserShower);
 303 };
 304
 305 // This class manages the lifetime of a WebContents created by the
 306 // Navigate() function. When Navigate() creates a WebContents for a URL,
 307 // an instance of this class takes ownership of it via TakeOwnership() until the
 308 // WebContents is added to a tab strip at which time ownership is
 309 // relinquished via ReleaseOwnership(). If this object goes out of scope without
 310 // being added to a tab strip, the created WebContents is deleted to
 311 // avoid a leak and the params->target_contents field is set to NULL.
 312 class ScopedTargetContentsOwner {
 313  public:
 314   explicit ScopedTargetContentsOwner(chrome::NavigateParams* params)
 315       : params_(params) {
 316   }
 317   ~ScopedTargetContentsOwner() {
 318     if (target_contents_owner_.get())
 319       params_->target_contents = NULL;
 320   }
 321
 322   // Assumes ownership of |params_|' target_contents until ReleaseOwnership
 323   // is called.
 324   void TakeOwnership() {
 325     target_contents_owner_.reset(params_->target_contents);
 326   }
 327
 328   // Relinquishes ownership of |params_|' target_contents.
 329   WebContents* ReleaseOwnership() {
 330     return target_contents_owner_.release();
 331   }
 332
 333  private:
 334   chrome::NavigateParams* params_;
 335   scoped_ptr<WebContents> target_contents_owner_;
 336   DISALLOW_COPY_AND_ASSIGN(ScopedTargetContentsOwner);
 337 };
 338
 339 content::WebContents* CreateTargetContents(const chrome::NavigateParams& params,
 340                                            const GURL& url) {
 341   WebContents::CreateParams create_params(
 342       params.browser->profile(),
 343       tab_util::GetSiteInstanceForNewTab(params.browser->profile(), url));
 344   if (params.source_contents) {
 345     create_params.initial_size =
 346         params.source_contents->GetContainerBounds().size();
 347     if (params.should_set_opener)
 348       create_params.opener = params.source_contents;
 349   }
 350   if (params.disposition == NEW_BACKGROUND_TAB)
 351     create_params.initially_hidden = true;
 352
 353 #if defined(USE_AURA)
 354   if (params.browser->window() &&
 355       params.browser->window()->GetNativeWindow()) {
 356     create_params.context =
 357         params.browser->window()->GetNativeWindow();
 358   }
 359 #endif
 360
 361   WebContents* target_contents = WebContents::Create(create_params);
 362
 363   // New tabs can have WebUI URLs that will make calls back to arbitrary
 364   // tab helpers, so the entire set of tab helpers needs to be set up
 365   // immediately.
 366   BrowserNavigatorWebContentsAdoption::AttachTabHelpers(target_contents);
 367   extensions::TabHelper::FromWebContents(target_contents)->
 368       SetExtensionAppById(params.extension_app_id);
 369   return target_contents;
 370 }
 371
 372 // If a prerendered page exists for |url|, replace the page at
 373 // |params->target_contents| with it and update to point to the swapped-in
 374 // WebContents.
 375 bool SwapInPrerender(const GURL& url, chrome::NavigateParams* params) {
 376   Profile* profile =
 377       Profile::FromBrowserContext(params->target_contents->GetBrowserContext());
 378   InstantSearchPrerenderer* prerenderer =
 379       InstantSearchPrerenderer::GetForProfile(profile);
 380   if (prerenderer && prerenderer->UsePrerenderedPage(url, params))
 381     return true;
 382
 383   prerender::PrerenderManager* prerender_manager =
 384       prerender::PrerenderManagerFactory::GetForProfile(profile);
 385   return prerender_manager &&
 386       prerender_manager->MaybeUsePrerenderedPage(url, params);
 387 }
 388
 389 chrome::HostDesktopType GetHostDesktop(Browser* browser) {
 390   if (browser)
 391     return browser->host_desktop_type();
 392   return chrome::GetActiveDesktop();
 393 }
 394
 395 }  // namespace
 396
 397 namespace chrome {
 398
 399 NavigateParams::NavigateParams(Browser* a_browser,
 400                                const GURL& a_url,
 401                                ui::PageTransition a_transition)
 402     : url(a_url),
 403       frame_tree_node_id(-1),
 404       uses_post(false),
 405       target_contents(NULL),
 406       source_contents(NULL),
 407       disposition(CURRENT_TAB),
 408       trusted_source(false),
 409       transition(a_transition),
 410       is_renderer_initiated(false),
 411       tabstrip_index(-1),
 412       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
 413       window_action(NO_ACTION),
 414       user_gesture(true),
 415       path_behavior(RESPECT),
 416       ref_behavior(IGNORE_REF),
 417       browser(a_browser),
 418       initiating_profile(NULL),
 419       host_desktop_type(GetHostDesktop(a_browser)),
 420       should_replace_current_entry(false),
 421       should_set_opener(false) {
 422 }
 423
 424 NavigateParams::NavigateParams(Browser* a_browser,
 425                                WebContents* a_target_contents)
 426     : frame_tree_node_id(-1),
 427       uses_post(false),
 428       target_contents(a_target_contents),
 429       source_contents(NULL),
 430       disposition(CURRENT_TAB),
 431       trusted_source(false),
 432       transition(ui::PAGE_TRANSITION_LINK),
 433       is_renderer_initiated(false),
 434       tabstrip_index(-1),
 435       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
 436       window_action(NO_ACTION),
 437       user_gesture(true),
 438       path_behavior(RESPECT),
 439       ref_behavior(IGNORE_REF),
 440       browser(a_browser),
 441       initiating_profile(NULL),
 442       host_desktop_type(GetHostDesktop(a_browser)),
 443       should_replace_current_entry(false),
 444       should_set_opener(false) {
 445 }
 446
 447 NavigateParams::NavigateParams(Profile* a_profile,
 448                                const GURL& a_url,
 449                                ui::PageTransition a_transition)
 450     : url(a_url),
 451       frame_tree_node_id(-1),
 452       uses_post(false),
 453       target_contents(NULL),
 454       source_contents(NULL),
 455       disposition(NEW_FOREGROUND_TAB),
 456       trusted_source(false),
 457       transition(a_transition),
 458       is_renderer_initiated(false),
 459       tabstrip_index(-1),
 460       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
 461       window_action(SHOW_WINDOW),
 462       user_gesture(true),
 463       path_behavior(RESPECT),
 464       ref_behavior(IGNORE_REF),
 465       browser(NULL),
 466       initiating_profile(a_profile),
 467       host_desktop_type(chrome::GetActiveDesktop()),
 468       should_replace_current_entry(false),
 469       should_set_opener(false) {
 470 }
 471
 472 NavigateParams::~NavigateParams() {}
 473
 474 void FillNavigateParamsFromOpenURLParams(chrome::NavigateParams* nav_params,
 475                                          const content::OpenURLParams& params) {
 476   nav_params->referrer = params.referrer;
 477   nav_params->frame_tree_node_id = params.frame_tree_node_id;
 478   nav_params->redirect_chain = params.redirect_chain;
 479   nav_params->extra_headers = params.extra_headers;
 480   nav_params->disposition = params.disposition;
 481   nav_params->trusted_source = false;
 482   nav_params->is_renderer_initiated = params.is_renderer_initiated;
 483   nav_params->transferred_global_request_id =
 484       params.transferred_global_request_id;
 485   nav_params->should_replace_current_entry =
 486       params.should_replace_current_entry;
 487   nav_params->uses_post = params.uses_post;
 488   nav_params->browser_initiated_post_data = params.browser_initiated_post_data;
 489 }
 490
 491 void Navigate(NavigateParams* params) {
 492   Browser* source_browser = params->browser;
 493   if (source_browser)
 494     params->initiating_profile = source_browser->profile();
 495   DCHECK(params->initiating_profile);
 496
 497   if (!AdjustNavigateParamsForURL(params))
 498     return;
 499
 500 #if defined(ENABLE_EXTENSIONS)
 501   const extensions::Extension* extension =
 502     extensions::ExtensionRegistry::Get(params->initiating_profile)->
 503         enabled_extensions().GetExtensionOrAppByURL(params->url);
 504   // Platform apps cannot navigate. Block the request.
 505   if (extension && extension->is_platform_app())
 506     params->url = GURL(chrome::kExtensionInvalidRequestURL);
 507 #endif
 508
 509   // The browser window may want to adjust the disposition.
 510   if (params->disposition == NEW_POPUP &&
 511       source_browser &&
 512       source_browser->window()) {
 513     params->disposition =
 514         source_browser->window()->GetDispositionForPopupBounds(
 515             params->window_bounds);
 516   }
 517
 518   params->browser = GetBrowserForDisposition(params);
 519   if (!params->browser)
 520     return;
 521
 522 #if defined(USE_ASH)
 523   if (source_browser && source_browser != params->browser) {
 524     // When the newly created browser was spawned by a browser which visits
 525     // another user's desktop, it should be shown on the same desktop as the
 526     // originating one. (This is part of the desktop separation per profile).
 527     MultiUserWindowManager* manager = MultiUserWindowManager::GetInstance();
 528     // Some unit tests have no manager instantiated.
 529     if (manager) {
 530       aura::Window* src_window = source_browser->window()->GetNativeWindow();
 531       aura::Window* new_window = params->browser->window()->GetNativeWindow();
 532       const std::string& src_user =
 533           manager->GetUserPresentingWindow(src_window);
 534       if (src_user != manager->GetUserPresentingWindow(new_window)) {
 535         // Once the window gets presented, it should be shown on the same
 536         // desktop as the desktop of the creating browser. Note that this
 537         // command will not show the window if it wasn't shown yet by the
 538         // browser creation.
 539         manager->ShowWindowForUser(new_window, src_user);
 540       }
 541     }
 542   }
 543 #endif
 544
 545   // Navigate() must not return early after this point.
 546
 547   if (GetSourceProfile(params) != params->browser->profile()) {
 548     // A tab is being opened from a link from a different profile, we must reset
 549     // source information that may cause state to be shared.
 550     params->source_contents = NULL;
 551     params->referrer = content::Referrer();
 552   }
 553
 554   // Make sure the Browser is shown if params call for it.
 555   ScopedBrowserShower shower(params);
 556
 557   // Makes sure any WebContents created by this function is destroyed if
 558   // not properly added to a tab strip.
 559   ScopedTargetContentsOwner target_contents_owner(params);
 560
 561   // Some dispositions need coercion to base types.
 562   NormalizeDisposition(params);
 563
 564   // If a new window has been created, it needs to be shown.
 565   if (params->window_action == NavigateParams::NO_ACTION &&
 566       source_browser != params->browser &&
 567       params->browser->tab_strip_model()->empty()) {
 568     params->window_action = NavigateParams::SHOW_WINDOW;
 569   }
 570
 571   // If we create a popup window from a non user-gesture, don't activate it.
 572   if (params->window_action == NavigateParams::SHOW_WINDOW &&
 573       params->disposition == NEW_POPUP &&
 574       params->user_gesture == false) {
 575     params->window_action = NavigateParams::SHOW_WINDOW_INACTIVE;
 576   }
 577
 578   // Determine if the navigation was user initiated. If it was, we need to
 579   // inform the target WebContents, and we may need to update the UI.
 580   ui::PageTransition base_transition =
 581       ui::PageTransitionStripQualifier(params->transition);
 582   bool user_initiated =
 583       params->transition & ui::PAGE_TRANSITION_FROM_ADDRESS_BAR ||
 584       base_transition == ui::PAGE_TRANSITION_TYPED ||
 585       base_transition == ui::PAGE_TRANSITION_AUTO_BOOKMARK ||
 586       base_transition == ui::PAGE_TRANSITION_GENERATED ||
 587       base_transition == ui::PAGE_TRANSITION_AUTO_TOPLEVEL ||
 588       base_transition == ui::PAGE_TRANSITION_RELOAD ||
 589       base_transition == ui::PAGE_TRANSITION_KEYWORD;
 590
 591   // Check if this is a singleton tab that already exists
 592   int singleton_index = chrome::GetIndexOfSingletonTab(params);
 593
 594   // Did we use a prerender?
 595   bool swapped_in_prerender = false;
 596
 597   // If no target WebContents was specified, we need to construct one if
 598   // we are supposed to target a new tab; unless it's a singleton that already
 599   // exists.
 600   if (!params->target_contents && singleton_index < 0) {
 601     DCHECK(!params->url.is_empty());
 602     if (params->disposition != CURRENT_TAB) {
 603       params->target_contents = CreateTargetContents(*params, params->url);
 604
 605       // This function takes ownership of |params->target_contents| until it
 606       // is added to a TabStripModel.
 607       target_contents_owner.TakeOwnership();
 608     } else {
 609       // ... otherwise if we're loading in the current tab, the target is the
 610       // same as the source.
 611       DCHECK(params->source_contents);
 612       params->target_contents = params->source_contents;
 613     }
 614
 615     // Note: at this point, if |params->disposition| is not CURRENT_TAB,
 616     // |params->target_contents| has not been attached to a Browser yet. (That
 617     // happens later in this function.) However, in that case, the
 618     // sessionStorage namespace could not match, so prerender will use the
 619     // asynchronous codepath and still swap.
 620     DCHECK(params->target_contents);
 621     swapped_in_prerender = SwapInPrerender(params->url, params);
 622
 623     if (user_initiated)
 624       params->target_contents->UserGestureDone();
 625
 626     if (!swapped_in_prerender) {
 627       // Try to handle non-navigational URLs that popup dialogs and such, these
 628       // should not actually navigate.
 629       if (!HandleNonNavigationAboutURL(params->url)) {
 630         // Perform the actual navigation, tracking whether it came from the
 631         // renderer.
 632
 633         LoadURLInContents(params->target_contents, params->url, params);
 634         // For prerender bookkeeping purposes, record that this pending navigate
 635         // originated from chrome::Navigate.
 636         content::NavigationEntry* entry =
 637             params->target_contents->GetController().GetPendingEntry();
 638         if (entry)
 639           entry->SetExtraData(prerender::kChromeNavigateExtraDataKey,
 640                               base::string16());
 641       }
 642     }
 643   } else {
 644     // |target_contents| was specified non-NULL, and so we assume it has already
 645     // been navigated appropriately. We need to do nothing more other than
 646     // add it to the appropriate tabstrip.
 647   }
 648
 649   // If the user navigated from the omnibox, and the selected tab is going to
 650   // lose focus, then make sure the focus for the source tab goes away from the
 651   // omnibox.
 652   if (params->source_contents &&
 653       (params->disposition == NEW_FOREGROUND_TAB ||
 654        params->disposition == NEW_WINDOW) &&
 655       (params->tabstrip_add_types & TabStripModel::ADD_INHERIT_OPENER))
 656     params->source_contents->Focus();
 657
 658   if (params->source_contents == params->target_contents ||
 659       (swapped_in_prerender && params->disposition == CURRENT_TAB)) {
 660     // The navigation occurred in the source tab.
 661     params->browser->UpdateUIForNavigationInTab(params->target_contents,
 662                                                 params->transition,
 663                                                 user_initiated);
 664   } else if (singleton_index == -1) {
 665     // If some non-default value is set for the index, we should tell the
 666     // TabStripModel to respect it.
 667     if (params->tabstrip_index != -1)
 668       params->tabstrip_add_types |= TabStripModel::ADD_FORCE_INDEX;
 669
 670     // The navigation should insert a new tab into the target Browser.
 671     params->browser->tab_strip_model()->AddWebContents(
 672         params->target_contents,
 673         params->tabstrip_index,
 674         params->transition,
 675         params->tabstrip_add_types);
 676     // Now that the |params->target_contents| is safely owned by the target
 677     // Browser's TabStripModel, we can release ownership.
 678     target_contents_owner.ReleaseOwnership();
 679   }
 680
 681   if (singleton_index >= 0) {
 682     WebContents* target =
 683         params->browser->tab_strip_model()->GetWebContentsAt(singleton_index);
 684
 685     if (target->IsCrashed()) {
 686       target->GetController().Reload(true);
 687     } else if (params->path_behavior == NavigateParams::IGNORE_AND_NAVIGATE &&
 688         target->GetURL() != params->url) {
 689       LoadURLInContents(target, params->url, params);
 690       // For prerender bookkeeping purposes, record that this pending navigate
 691       // originated from chrome::Navigate.
 692       content::NavigationEntry* entry =
 693           target->GetController().GetPendingEntry();
 694       if (entry)
 695         entry->SetExtraData(prerender::kChromeNavigateExtraDataKey,
 696                             base::string16());
 697     }
 698
 699     // If the singleton tab isn't already selected, select it.
 700     if (params->source_contents != params->target_contents) {
 701       params->browser->tab_strip_model()->ActivateTabAt(singleton_index,
 702                                                         user_initiated);
 703     }
 704   }
 705
 706   if (params->disposition != CURRENT_TAB) {
 707     content::NotificationService::current()->Notify(
 708         chrome::NOTIFICATION_TAB_ADDED,
 709         content::Source<content::WebContentsDelegate>(params->browser),
 710         content::Details<WebContents>(params->target_contents));
 711   }
 712 }
 713
 714 bool IsURLAllowedInIncognito(const GURL& url,
 715                              content::BrowserContext* browser_context) {
 716   if (url.scheme() == content::kViewSourceScheme) {
 717     // A view-source URL is allowed in incognito mode only if the URL itself
 718     // is allowed in incognito mode. Remove the "view-source:" from the start
 719     // of the URL and validate the rest.
 720     std::string stripped_spec = url.spec();
 721     DCHECK_GT(stripped_spec.size(), strlen(content::kViewSourceScheme));
 722     stripped_spec.erase(0, strlen(content::kViewSourceScheme) + 1);
 723     GURL stripped_url(stripped_spec);
 724     return stripped_url.is_valid() &&
 725         IsURLAllowedInIncognito(stripped_url, browser_context);
 726   }
 727   // Most URLs are allowed in incognito; the following are exceptions.
 728   // chrome://extensions is on the list because it redirects to
 729   // chrome://settings.
 730   if (url.scheme() == content::kChromeUIScheme &&
 731       (url.host() == chrome::kChromeUISettingsHost ||
 732        url.host() == chrome::kChromeUISettingsFrameHost ||
 733        url.host() == chrome::kChromeUIExtensionsHost ||
 734        url.host() == chrome::kChromeUIBookmarksHost ||
 735 #if !defined(OS_CHROMEOS)
 736        url.host() == chrome::kChromeUIChromeSigninHost ||
 737 #endif
 738        url.host() == chrome::kChromeUIUberHost ||
 739        url.host() == chrome::kChromeUIThumbnailHost ||
 740        url.host() == chrome::kChromeUIThumbnailHost2 ||
 741        url.host() == chrome::kChromeUIThumbnailListHost ||
 742        url.host() == chrome::kChromeUISuggestionsHost ||
 743        url.host() == chrome::kChromeUIDevicesHost ||
 744        url.host() == chrome::kChromeUIVoiceSearchHost)) {
 745     return false;
 746   }
 747
 748   if (url.scheme() == chrome::kChromeSearchScheme &&
 749       (url.host() == chrome::kChromeUIThumbnailHost ||
 750        url.host() == chrome::kChromeUIThumbnailHost2 ||
 751        url.host() == chrome::kChromeUIThumbnailListHost ||
 752        url.host() == chrome::kChromeUISuggestionsHost)) {
 753     return false;
 754   }
 755
 756   GURL rewritten_url = url;
 757   bool reverse_on_redirect = false;
 758   content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
 759       &rewritten_url, browser_context, &reverse_on_redirect);
 760
 761   // Some URLs are mapped to uber subpages. Do not allow them in incognito.
 762   return !(rewritten_url.scheme() == content::kChromeUIScheme &&
 763            rewritten_url.host() == chrome::kChromeUIUberHost);
 764 }
 765
 766 }  // namespace chrome