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/prefs/incognito_mode_prefs.h"
  16 #include "chrome/browser/prerender/prerender_manager.h"
  17 #include "chrome/browser/prerender/prerender_manager_factory.h"
  18 #include "chrome/browser/prerender/prerender_util.h"
  19 #include "chrome/browser/profiles/profile.h"
  20 #include "chrome/browser/tab_contents/tab_util.h"
  21 #include "chrome/browser/ui/browser.h"
  22 #include "chrome/browser/ui/browser_finder.h"
  23 #include "chrome/browser/ui/browser_instant_controller.h"
  24 #include "chrome/browser/ui/browser_window.h"
  25 #include "chrome/browser/ui/host_desktop.h"
  26 #include "chrome/browser/ui/location_bar/location_bar.h"
  27 #include "chrome/browser/ui/search/instant_search_prerenderer.h"
  28 #include "chrome/browser/ui/singleton_tabs.h"
  29 #include "chrome/browser/ui/status_bubble.h"
  30 #include "chrome/browser/ui/tab_helpers.h"
  31 #include "chrome/browser/ui/tabs/tab_strip_model.h"
  32 #include "chrome/common/pref_names.h"
  33 #include "chrome/common/url_constants.h"
  34 #include "components/google/core/browser/google_url_tracker.h"
  35 #include "content/public/browser/browser_url_handler.h"
  36 #include "content/public/browser/navigation_entry.h"
  37 #include "content/public/browser/notification_service.h"
  38 #include "content/public/browser/render_view_host.h"
  39 #include "content/public/browser/web_contents.h"
  40
  41 #if defined(USE_ASH)
  42 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
  43 #endif
  44
  45 #if defined(USE_AURA)
  46 #include "ui/aura/window.h"
  47 #endif
  48
  49 #if defined(ENABLE_EXTENSIONS)
  50 #include "chrome/browser/extensions/tab_helper.h"
  51 #include "chrome/browser/web_applications/web_app.h"
  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 defined(ENABLE_EXTENSIONS)
 158       if (!params->extension_app_id.empty()) {
 159         app_name = web_app::GenerateApplicationNameFromExtensionId(
 160             params->extension_app_id);
 161       } else if (params->browser && !params->browser->app_name().empty()) {
 162         app_name = params->browser->app_name();
 163       } else if (params->source_contents) {
 164         extensions::TabHelper* extensions_tab_helper =
 165             extensions::TabHelper::FromWebContents(params->source_contents);
 166         if (extensions_tab_helper && extensions_tab_helper->is_app()) {
 167           app_name = web_app::GenerateApplicationNameFromExtensionId(
 168               extensions_tab_helper->extension_app()->id());
 169         }
 170       }
 171 #endif
 172       if (app_name.empty()) {
 173         Browser::CreateParams browser_params(
 174             Browser::TYPE_POPUP, profile, params->host_desktop_type);
 175         browser_params.trusted_source = params->trusted_source;
 176         browser_params.initial_bounds = params->window_bounds;
 177         return new Browser(browser_params);
 178       }
 179
 180       return new Browser(Browser::CreateParams::CreateForApp(
 181           app_name,
 182           params->trusted_source,
 183           params->window_bounds,
 184           profile,
 185           params->host_desktop_type));
 186     }
 187     case NEW_WINDOW: {
 188       // Make a new normal browser window.
 189       return new Browser(Browser::CreateParams(profile,
 190                                                params->host_desktop_type));
 191     }
 192     case OFF_THE_RECORD:
 193       // Make or find an incognito window.
 194       return GetOrCreateBrowser(profile->GetOffTheRecordProfile(),
 195                                 params->host_desktop_type);
 196     // The following types all result in no navigation.
 197     case SUPPRESS_OPEN:
 198     case SAVE_TO_DISK:
 199     case IGNORE_ACTION:
 200       return NULL;
 201     default:
 202       NOTREACHED();
 203   }
 204   return NULL;
 205 }
 206
 207 // Fix disposition and other parameter values depending on prevailing
 208 // conditions.
 209 void NormalizeDisposition(chrome::NavigateParams* params) {
 210   // Calculate the WindowOpenDisposition if necessary.
 211   if (params->browser->tab_strip_model()->empty() &&
 212       (params->disposition == NEW_BACKGROUND_TAB ||
 213        params->disposition == CURRENT_TAB ||
 214        params->disposition == SINGLETON_TAB)) {
 215     params->disposition = NEW_FOREGROUND_TAB;
 216   }
 217   if (params->browser->profile()->IsOffTheRecord() &&
 218       params->disposition == OFF_THE_RECORD) {
 219     params->disposition = NEW_FOREGROUND_TAB;
 220   }
 221   if (!params->source_contents && params->disposition == CURRENT_TAB)
 222     params->disposition = NEW_FOREGROUND_TAB;
 223
 224   switch (params->disposition) {
 225     case NEW_BACKGROUND_TAB:
 226       // Disposition trumps add types. ADD_ACTIVE is a default, so we need to
 227       // remove it if disposition implies the tab is going to open in the
 228       // background.
 229       params->tabstrip_add_types &= ~TabStripModel::ADD_ACTIVE;
 230       break;
 231
 232     case NEW_WINDOW:
 233     case NEW_POPUP:
 234       // Code that wants to open a new window typically expects it to be shown
 235       // automatically.
 236       if (params->window_action == chrome::NavigateParams::NO_ACTION)
 237         params->window_action = chrome::NavigateParams::SHOW_WINDOW;
 238       // Fall-through.
 239     case NEW_FOREGROUND_TAB:
 240     case SINGLETON_TAB:
 241       params->tabstrip_add_types |= TabStripModel::ADD_ACTIVE;
 242       break;
 243
 244     default:
 245       break;
 246   }
 247 }
 248
 249 // Obtain the profile used by the code that originated the Navigate() request.
 250 Profile* GetSourceProfile(chrome::NavigateParams* params) {
 251   if (params->source_contents) {
 252     return Profile::FromBrowserContext(
 253         params->source_contents->GetBrowserContext());
 254   }
 255
 256   return params->initiating_profile;
 257 }
 258
 259 void LoadURLInContents(WebContents* target_contents,
 260                        const GURL& url,
 261                        chrome::NavigateParams* params) {
 262   NavigationController::LoadURLParams load_url_params(url);
 263   load_url_params.referrer = params->referrer;
 264   load_url_params.frame_tree_node_id = params->frame_tree_node_id;
 265   load_url_params.redirect_chain = params->redirect_chain;
 266   load_url_params.transition_type = params->transition;
 267   load_url_params.extra_headers = params->extra_headers;
 268   load_url_params.should_replace_current_entry =
 269       params->should_replace_current_entry;
 270
 271   if (params->transferred_global_request_id != GlobalRequestID()) {
 272     load_url_params.is_renderer_initiated = params->is_renderer_initiated;
 273     load_url_params.transferred_global_request_id =
 274         params->transferred_global_request_id;
 275   } else if (params->is_renderer_initiated) {
 276     load_url_params.is_renderer_initiated = true;
 277   }
 278
 279   // Only allows the browser-initiated navigation to use POST.
 280   if (params->uses_post && !params->is_renderer_initiated) {
 281     load_url_params.load_type =
 282         NavigationController::LOAD_TYPE_BROWSER_INITIATED_HTTP_POST;
 283     load_url_params.browser_initiated_post_data =
 284         params->browser_initiated_post_data;
 285   }
 286   target_contents->GetController().LoadURLWithParams(load_url_params);
 287 }
 288
 289 // This class makes sure the Browser object held in |params| is made visible
 290 // by the time it goes out of scope, provided |params| wants it to be shown.
 291 class ScopedBrowserShower {
 292  public:
 293   explicit ScopedBrowserShower(chrome::NavigateParams* params)
 294       : params_(params) {
 295   }
 296   ~ScopedBrowserShower() {
 297     if (params_->window_action ==
 298         chrome::NavigateParams::SHOW_WINDOW_INACTIVE) {
 299       params_->browser->window()->ShowInactive();
 300     } else if (params_->window_action == chrome::NavigateParams::SHOW_WINDOW) {
 301       params_->browser->window()->Show();
 302       // If a user gesture opened a popup window, focus the contents.
 303       if (params_->user_gesture && params_->disposition == NEW_POPUP &&
 304           params_->target_contents) {
 305         params_->target_contents->Focus();
 306       }
 307     }
 308   }
 309
 310  private:
 311   chrome::NavigateParams* params_;
 312   DISALLOW_COPY_AND_ASSIGN(ScopedBrowserShower);
 313 };
 314
 315 // This class manages the lifetime of a WebContents created by the
 316 // Navigate() function. When Navigate() creates a WebContents for a URL,
 317 // an instance of this class takes ownership of it via TakeOwnership() until the
 318 // WebContents is added to a tab strip at which time ownership is
 319 // relinquished via ReleaseOwnership(). If this object goes out of scope without
 320 // being added to a tab strip, the created WebContents is deleted to
 321 // avoid a leak and the params->target_contents field is set to NULL.
 322 class ScopedTargetContentsOwner {
 323  public:
 324   explicit ScopedTargetContentsOwner(chrome::NavigateParams* params)
 325       : params_(params) {
 326   }
 327   ~ScopedTargetContentsOwner() {
 328     if (target_contents_owner_.get())
 329       params_->target_contents = NULL;
 330   }
 331
 332   // Assumes ownership of |params_|' target_contents until ReleaseOwnership
 333   // is called.
 334   void TakeOwnership() {
 335     target_contents_owner_.reset(params_->target_contents);
 336   }
 337
 338   // Relinquishes ownership of |params_|' target_contents.
 339   WebContents* ReleaseOwnership() {
 340     return target_contents_owner_.release();
 341   }
 342
 343  private:
 344   chrome::NavigateParams* params_;
 345   scoped_ptr<WebContents> target_contents_owner_;
 346   DISALLOW_COPY_AND_ASSIGN(ScopedTargetContentsOwner);
 347 };
 348
 349 content::WebContents* CreateTargetContents(const chrome::NavigateParams& params,
 350                                            const GURL& url) {
 351   WebContents::CreateParams create_params(
 352       params.browser->profile(),
 353       tab_util::GetSiteInstanceForNewTab(params.browser->profile(), url));
 354   if (params.source_contents) {
 355     create_params.initial_size =
 356         params.source_contents->GetContainerBounds().size();
 357     if (params.should_set_opener)
 358       create_params.opener = params.source_contents;
 359   }
 360   if (params.disposition == NEW_BACKGROUND_TAB)
 361     create_params.initially_hidden = true;
 362
 363 #if defined(USE_AURA)
 364   if (params.browser->window() &&
 365       params.browser->window()->GetNativeWindow()) {
 366     create_params.context =
 367         params.browser->window()->GetNativeWindow();
 368   }
 369 #endif
 370
 371   WebContents* target_contents = WebContents::Create(create_params);
 372
 373   // New tabs can have WebUI URLs that will make calls back to arbitrary
 374   // tab helpers, so the entire set of tab helpers needs to be set up
 375   // immediately.
 376   BrowserNavigatorWebContentsAdoption::AttachTabHelpers(target_contents);
 377 #if defined(ENABLE_EXTENSIONS)
 378   extensions::TabHelper::FromWebContents(target_contents)->
 379       SetExtensionAppById(params.extension_app_id);
 380 #endif
 381   return target_contents;
 382 }
 383
 384 // If a prerendered page exists for |url|, replace the page at
 385 // |params->target_contents| with it and update to point to the swapped-in
 386 // WebContents.
 387 bool SwapInPrerender(const GURL& url, chrome::NavigateParams* params) {
 388   Profile* profile =
 389       Profile::FromBrowserContext(params->target_contents->GetBrowserContext());
 390   InstantSearchPrerenderer* prerenderer =
 391       InstantSearchPrerenderer::GetForProfile(profile);
 392   if (prerenderer && prerenderer->UsePrerenderedPage(url, params))
 393     return true;
 394
 395   prerender::PrerenderManager* prerender_manager =
 396       prerender::PrerenderManagerFactory::GetForProfile(profile);
 397   return prerender_manager &&
 398       prerender_manager->MaybeUsePrerenderedPage(url, params);
 399 }
 400
 401 chrome::HostDesktopType GetHostDesktop(Browser* browser) {
 402   if (browser)
 403     return browser->host_desktop_type();
 404   return chrome::GetActiveDesktop();
 405 }
 406
 407 }  // namespace
 408
 409 namespace chrome {
 410
 411 NavigateParams::NavigateParams(Browser* a_browser,
 412                                const GURL& a_url,
 413                                ui::PageTransition a_transition)
 414     : url(a_url),
 415       frame_tree_node_id(-1),
 416       uses_post(false),
 417       target_contents(NULL),
 418       source_contents(NULL),
 419       disposition(CURRENT_TAB),
 420       trusted_source(false),
 421       transition(a_transition),
 422       is_renderer_initiated(false),
 423       tabstrip_index(-1),
 424       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
 425       window_action(NO_ACTION),
 426       user_gesture(true),
 427       path_behavior(RESPECT),
 428       ref_behavior(IGNORE_REF),
 429       browser(a_browser),
 430       initiating_profile(NULL),
 431       host_desktop_type(GetHostDesktop(a_browser)),
 432       should_replace_current_entry(false),
 433       should_set_opener(false) {
 434 }
 435
 436 NavigateParams::NavigateParams(Browser* a_browser,
 437                                WebContents* a_target_contents)
 438     : frame_tree_node_id(-1),
 439       uses_post(false),
 440       target_contents(a_target_contents),
 441       source_contents(NULL),
 442       disposition(CURRENT_TAB),
 443       trusted_source(false),
 444       transition(ui::PAGE_TRANSITION_LINK),
 445       is_renderer_initiated(false),
 446       tabstrip_index(-1),
 447       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
 448       window_action(NO_ACTION),
 449       user_gesture(true),
 450       path_behavior(RESPECT),
 451       ref_behavior(IGNORE_REF),
 452       browser(a_browser),
 453       initiating_profile(NULL),
 454       host_desktop_type(GetHostDesktop(a_browser)),
 455       should_replace_current_entry(false),
 456       should_set_opener(false) {
 457 }
 458
 459 NavigateParams::NavigateParams(Profile* a_profile,
 460                                const GURL& a_url,
 461                                ui::PageTransition a_transition)
 462     : url(a_url),
 463       frame_tree_node_id(-1),
 464       uses_post(false),
 465       target_contents(NULL),
 466       source_contents(NULL),
 467       disposition(NEW_FOREGROUND_TAB),
 468       trusted_source(false),
 469       transition(a_transition),
 470       is_renderer_initiated(false),
 471       tabstrip_index(-1),
 472       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
 473       window_action(SHOW_WINDOW),
 474       user_gesture(true),
 475       path_behavior(RESPECT),
 476       ref_behavior(IGNORE_REF),
 477       browser(NULL),
 478       initiating_profile(a_profile),
 479       host_desktop_type(chrome::GetActiveDesktop()),
 480       should_replace_current_entry(false),
 481       should_set_opener(false) {
 482 }
 483
 484 NavigateParams::~NavigateParams() {}
 485
 486 void FillNavigateParamsFromOpenURLParams(chrome::NavigateParams* nav_params,
 487                                          const content::OpenURLParams& params) {
 488   nav_params->referrer = params.referrer;
 489   nav_params->frame_tree_node_id = params.frame_tree_node_id;
 490   nav_params->redirect_chain = params.redirect_chain;
 491   nav_params->extra_headers = params.extra_headers;
 492   nav_params->disposition = params.disposition;
 493   nav_params->trusted_source = false;
 494   nav_params->is_renderer_initiated = params.is_renderer_initiated;
 495   nav_params->transferred_global_request_id =
 496       params.transferred_global_request_id;
 497   nav_params->should_replace_current_entry =
 498       params.should_replace_current_entry;
 499   nav_params->uses_post = params.uses_post;
 500   nav_params->browser_initiated_post_data = params.browser_initiated_post_data;
 501 }
 502
 503 void Navigate(NavigateParams* params) {
 504   Browser* source_browser = params->browser;
 505   if (source_browser)
 506     params->initiating_profile = source_browser->profile();
 507   DCHECK(params->initiating_profile);
 508
 509   if (!AdjustNavigateParamsForURL(params))
 510     return;
 511
 512 #if defined(ENABLE_EXTENSIONS)
 513   const extensions::Extension* extension =
 514     extensions::ExtensionRegistry::Get(params->initiating_profile)->
 515         enabled_extensions().GetExtensionOrAppByURL(params->url);
 516   // Platform apps cannot navigate. Block the request.
 517   if (extension && extension->is_platform_app())
 518     params->url = GURL(chrome::kExtensionInvalidRequestURL);
 519 #endif
 520
 521   // The browser window may want to adjust the disposition.
 522   if (params->disposition == NEW_POPUP &&
 523       source_browser &&
 524       source_browser->window()) {
 525     params->disposition =
 526         source_browser->window()->GetDispositionForPopupBounds(
 527             params->window_bounds);
 528   }
 529
 530   params->browser = GetBrowserForDisposition(params);
 531   if (!params->browser)
 532     return;
 533
 534 #if defined(USE_ASH)
 535   if (source_browser && source_browser != params->browser) {
 536     // When the newly created browser was spawned by a browser which visits
 537     // another user's desktop, it should be shown on the same desktop as the
 538     // originating one. (This is part of the desktop separation per profile).
 539     MultiUserWindowManager* manager = MultiUserWindowManager::GetInstance();
 540     // Some unit tests have no manager instantiated.
 541     if (manager) {
 542       aura::Window* src_window = source_browser->window()->GetNativeWindow();
 543       aura::Window* new_window = params->browser->window()->GetNativeWindow();
 544       const std::string& src_user =
 545           manager->GetUserPresentingWindow(src_window);
 546       if (src_user != manager->GetUserPresentingWindow(new_window)) {
 547         // Once the window gets presented, it should be shown on the same
 548         // desktop as the desktop of the creating browser. Note that this
 549         // command will not show the window if it wasn't shown yet by the
 550         // browser creation.
 551         manager->ShowWindowForUser(new_window, src_user);
 552       }
 553     }
 554   }
 555 #endif
 556
 557   // Navigate() must not return early after this point.
 558
 559   if (GetSourceProfile(params) != params->browser->profile()) {
 560     // A tab is being opened from a link from a different profile, we must reset
 561     // source information that may cause state to be shared.
 562     params->source_contents = NULL;
 563     params->referrer = content::Referrer();
 564   }
 565
 566   // Make sure the Browser is shown if params call for it.
 567   ScopedBrowserShower shower(params);
 568
 569   // Makes sure any WebContents created by this function is destroyed if
 570   // not properly added to a tab strip.
 571   ScopedTargetContentsOwner target_contents_owner(params);
 572
 573   // Some dispositions need coercion to base types.
 574   NormalizeDisposition(params);
 575
 576   // If a new window has been created, it needs to be shown.
 577   if (params->window_action == NavigateParams::NO_ACTION &&
 578       source_browser != params->browser &&
 579       params->browser->tab_strip_model()->empty()) {
 580     params->window_action = NavigateParams::SHOW_WINDOW;
 581   }
 582
 583   // If we create a popup window from a non user-gesture, don't activate it.
 584   if (params->window_action == NavigateParams::SHOW_WINDOW &&
 585       params->disposition == NEW_POPUP &&
 586       params->user_gesture == false) {
 587     params->window_action = NavigateParams::SHOW_WINDOW_INACTIVE;
 588   }
 589
 590   // Determine if the navigation was user initiated. If it was, we need to
 591   // inform the target WebContents, and we may need to update the UI.
 592   ui::PageTransition base_transition =
 593       ui::PageTransitionStripQualifier(params->transition);
 594   bool user_initiated =
 595       params->transition & ui::PAGE_TRANSITION_FROM_ADDRESS_BAR ||
 596       base_transition == ui::PAGE_TRANSITION_TYPED ||
 597       base_transition == ui::PAGE_TRANSITION_AUTO_BOOKMARK ||
 598       base_transition == ui::PAGE_TRANSITION_GENERATED ||
 599       base_transition == ui::PAGE_TRANSITION_AUTO_TOPLEVEL ||
 600       base_transition == ui::PAGE_TRANSITION_RELOAD ||
 601       base_transition == ui::PAGE_TRANSITION_KEYWORD;
 602
 603   // Check if this is a singleton tab that already exists
 604   int singleton_index = chrome::GetIndexOfSingletonTab(params);
 605
 606   // Did we use a prerender?
 607   bool swapped_in_prerender = false;
 608
 609   // If no target WebContents was specified, we need to construct one if
 610   // we are supposed to target a new tab; unless it's a singleton that already
 611   // exists.
 612   if (!params->target_contents && singleton_index < 0) {
 613     DCHECK(!params->url.is_empty());
 614     if (params->disposition != CURRENT_TAB) {
 615       params->target_contents = CreateTargetContents(*params, params->url);
 616
 617       // This function takes ownership of |params->target_contents| until it
 618       // is added to a TabStripModel.
 619       target_contents_owner.TakeOwnership();
 620     } else {
 621       // ... otherwise if we're loading in the current tab, the target is the
 622       // same as the source.
 623       DCHECK(params->source_contents);
 624       params->target_contents = params->source_contents;
 625     }
 626
 627     // Note: at this point, if |params->disposition| is not CURRENT_TAB,
 628     // |params->target_contents| has not been attached to a Browser yet. (That
 629     // happens later in this function.) However, in that case, the
 630     // sessionStorage namespace could not match, so prerender will use the
 631     // asynchronous codepath and still swap.
 632     DCHECK(params->target_contents);
 633     swapped_in_prerender = SwapInPrerender(params->url, params);
 634
 635     if (user_initiated)
 636       params->target_contents->UserGestureDone();
 637
 638     if (!swapped_in_prerender) {
 639       // Try to handle non-navigational URLs that popup dialogs and such, these
 640       // should not actually navigate.
 641       if (!HandleNonNavigationAboutURL(params->url)) {
 642         // Perform the actual navigation, tracking whether it came from the
 643         // renderer.
 644
 645         LoadURLInContents(params->target_contents, params->url, params);
 646         // For prerender bookkeeping purposes, record that this pending navigate
 647         // originated from chrome::Navigate.
 648         content::NavigationEntry* entry =
 649             params->target_contents->GetController().GetPendingEntry();
 650         if (entry)
 651           entry->SetExtraData(prerender::kChromeNavigateExtraDataKey,
 652                               base::string16());
 653       }
 654     }
 655   } else {
 656     // |target_contents| was specified non-NULL, and so we assume it has already
 657     // been navigated appropriately. We need to do nothing more other than
 658     // add it to the appropriate tabstrip.
 659   }
 660
 661   // If the user navigated from the omnibox, and the selected tab is going to
 662   // lose focus, then make sure the focus for the source tab goes away from the
 663   // omnibox.
 664   if (params->source_contents &&
 665       (params->disposition == NEW_FOREGROUND_TAB ||
 666        params->disposition == NEW_WINDOW) &&
 667       (params->tabstrip_add_types & TabStripModel::ADD_INHERIT_OPENER))
 668     params->source_contents->Focus();
 669
 670   if (params->source_contents == params->target_contents ||
 671       (swapped_in_prerender && params->disposition == CURRENT_TAB)) {
 672     // The navigation occurred in the source tab.
 673     params->browser->UpdateUIForNavigationInTab(params->target_contents,
 674                                                 params->transition,
 675                                                 user_initiated);
 676   } else if (singleton_index == -1) {
 677     // If some non-default value is set for the index, we should tell the
 678     // TabStripModel to respect it.
 679     if (params->tabstrip_index != -1)
 680       params->tabstrip_add_types |= TabStripModel::ADD_FORCE_INDEX;
 681
 682     // The navigation should insert a new tab into the target Browser.
 683     params->browser->tab_strip_model()->AddWebContents(
 684         params->target_contents,
 685         params->tabstrip_index,
 686         params->transition,
 687         params->tabstrip_add_types);
 688     // Now that the |params->target_contents| is safely owned by the target
 689     // Browser's TabStripModel, we can release ownership.
 690     target_contents_owner.ReleaseOwnership();
 691   }
 692
 693   if (singleton_index >= 0) {
 694     WebContents* target =
 695         params->browser->tab_strip_model()->GetWebContentsAt(singleton_index);
 696
 697     if (target->IsCrashed()) {
 698       target->GetController().Reload(true);
 699     } else if (params->path_behavior == NavigateParams::IGNORE_AND_NAVIGATE &&
 700         target->GetURL() != params->url) {
 701       LoadURLInContents(target, params->url, params);
 702       // For prerender bookkeeping purposes, record that this pending navigate
 703       // originated from chrome::Navigate.
 704       content::NavigationEntry* entry =
 705           target->GetController().GetPendingEntry();
 706       if (entry)
 707         entry->SetExtraData(prerender::kChromeNavigateExtraDataKey,
 708                             base::string16());
 709     }
 710
 711     // If the singleton tab isn't already selected, select it.
 712     if (params->source_contents != params->target_contents) {
 713       params->browser->tab_strip_model()->ActivateTabAt(singleton_index,
 714                                                         user_initiated);
 715     }
 716   }
 717
 718   if (params->disposition != CURRENT_TAB) {
 719     content::NotificationService::current()->Notify(
 720         chrome::NOTIFICATION_TAB_ADDED,
 721         content::Source<content::WebContentsDelegate>(params->browser),
 722         content::Details<WebContents>(params->target_contents));
 723   }
 724 }
 725
 726 bool IsURLAllowedInIncognito(const GURL& url,
 727                              content::BrowserContext* browser_context) {
 728   if (url.scheme() == content::kViewSourceScheme) {
 729     // A view-source URL is allowed in incognito mode only if the URL itself
 730     // is allowed in incognito mode. Remove the "view-source:" from the start
 731     // of the URL and validate the rest.
 732     std::string stripped_spec = url.spec();
 733     DCHECK_GT(stripped_spec.size(), strlen(content::kViewSourceScheme));
 734     stripped_spec.erase(0, strlen(content::kViewSourceScheme) + 1);
 735     GURL stripped_url(stripped_spec);
 736     return stripped_url.is_valid() &&
 737         IsURLAllowedInIncognito(stripped_url, browser_context);
 738   }
 739   // Most URLs are allowed in incognito; the following are exceptions.
 740   // chrome://extensions is on the list because it redirects to
 741   // chrome://settings.
 742   if (url.scheme() == content::kChromeUIScheme &&
 743       (url.host() == chrome::kChromeUISettingsHost ||
 744        url.host() == chrome::kChromeUISettingsFrameHost ||
 745        url.host() == chrome::kChromeUIExtensionsHost ||
 746        url.host() == chrome::kChromeUIBookmarksHost ||
 747 #if !defined(OS_CHROMEOS)
 748        url.host() == chrome::kChromeUIChromeSigninHost ||
 749 #endif
 750        url.host() == chrome::kChromeUIUberHost ||
 751        url.host() == chrome::kChromeUIThumbnailHost ||
 752        url.host() == chrome::kChromeUIThumbnailHost2 ||
 753        url.host() == chrome::kChromeUIThumbnailListHost ||
 754        url.host() == chrome::kChromeUISuggestionsHost ||
 755        url.host() == chrome::kChromeUIDevicesHost ||
 756        url.host() == chrome::kChromeUIVoiceSearchHost)) {
 757     return false;
 758   }
 759
 760   if (url.scheme() == chrome::kChromeSearchScheme &&
 761       (url.host() == chrome::kChromeUIThumbnailHost ||
 762        url.host() == chrome::kChromeUIThumbnailHost2 ||
 763        url.host() == chrome::kChromeUIThumbnailListHost ||
 764        url.host() == chrome::kChromeUISuggestionsHost)) {
 765     return false;
 766   }
 767
 768   GURL rewritten_url = url;
 769   bool reverse_on_redirect = false;
 770   content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
 771       &rewritten_url, browser_context, &reverse_on_redirect);
 772
 773   // Some URLs are mapped to uber subpages. Do not allow them in incognito.
 774   return !(rewritten_url.scheme() == content::kChromeUIScheme &&
 775            rewritten_url.host() == chrome::kChromeUIUberHost);
 776 }
 777
 778 }  // namespace chrome