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/url_constants.h"
  33 #include "content/public/browser/browser_url_handler.h"
  34 #include "content/public/browser/navigation_entry.h"
  35 #include "content/public/browser/notification_service.h"
  36 #include "content/public/browser/render_view_host.h"
  37 #include "content/public/browser/web_contents.h"
  38
  39 #if defined(USE_ASH)
  40 #include "chrome/browser/ui/ash/multi_user/multi_user_window_manager.h"
  41 #endif
  42
  43 #if defined(USE_AURA)
  44 #include "ui/aura/window.h"
  45 #endif
  46
  47 #if defined(ENABLE_EXTENSIONS)
  48 #include "chrome/browser/extensions/tab_helper.h"
  49 #include "chrome/browser/web_applications/web_app.h"
  50 #include "extensions/browser/extension_registry.h"
  51 #include "extensions/common/extension.h"
  52 #include "extensions/common/extension_set.h"
  53 #endif
  54
  55 using content::GlobalRequestID;
  56 using content::NavigationController;
  57 using content::WebContents;
  58
  59 class BrowserNavigatorWebContentsAdoption {
  60  public:
  61   static void AttachTabHelpers(content::WebContents* contents) {
  62     TabHelpers::AttachTabHelpers(contents);
  63   }
  64 };
  65
  66 namespace {
  67
  68 // Returns true if the specified Browser can open tabs. Not all Browsers support
  69 // multiple tabs, such as app frames and popups. This function returns false for
  70 // those types of Browser.
  71 bool WindowCanOpenTabs(Browser* browser) {
  72   return browser->CanSupportWindowFeature(Browser::FEATURE_TABSTRIP) ||
  73       browser->tab_strip_model()->empty();
  74 }
  75
  76 // Finds an existing Browser compatible with |profile|, making a new one if no
  77 // such Browser is located.
  78 Browser* GetOrCreateBrowser(Profile* profile,
  79                             chrome::HostDesktopType host_desktop_type) {
  80   Browser* browser = chrome::FindTabbedBrowser(profile, false,
  81                                                host_desktop_type);
  82   return browser ? browser : new Browser(
  83       Browser::CreateParams(profile, host_desktop_type));
  84 }
  85
  86 // Change some of the navigation parameters based on the particular URL.
  87 // Currently this applies to some chrome:// pages which we always want to open
  88 // in a non-incognito window. Note that even though a ChromeOS guest session is
  89 // technically an incognito window, these URLs are allowed.
  90 // Returns true on success. Otherwise, if changing params leads the browser into
  91 // an erroneous state, returns false.
  92 bool AdjustNavigateParamsForURL(chrome::NavigateParams* params) {
  93   if (params->target_contents != NULL ||
  94       chrome::IsURLAllowedInIncognito(params->url,
  95                                       params->initiating_profile) ||
  96       params->initiating_profile->IsGuestSession()) {
  97     return true;
  98   }
  99
 100   Profile* profile = params->initiating_profile;
 101
 102   if (profile->IsOffTheRecord() || params->disposition == OFF_THE_RECORD) {
 103     profile = profile->GetOriginalProfile();
 104
 105     // If incognito is forced, we punt.
 106     PrefService* prefs = profile->GetPrefs();
 107     if (prefs && IncognitoModePrefs::GetAvailability(prefs) ==
 108             IncognitoModePrefs::FORCED) {
 109       return false;
 110     }
 111
 112     params->disposition = SINGLETON_TAB;
 113     params->browser = GetOrCreateBrowser(profile, params->host_desktop_type);
 114     params->window_action = chrome::NavigateParams::SHOW_WINDOW;
 115   }
 116
 117   return true;
 118 }
 119
 120 // Returns a Browser that can host the navigation or tab addition specified in
 121 // |params|. This might just return the same Browser specified in |params|, or
 122 // some other if that Browser is deemed incompatible.
 123 Browser* GetBrowserForDisposition(chrome::NavigateParams* params) {
 124   // If no source WebContents was specified, we use the selected one from
 125   // the target browser. This must happen first, before
 126   // GetBrowserForDisposition() has a chance to replace |params->browser| with
 127   // another one.
 128   if (!params->source_contents && params->browser) {
 129     params->source_contents =
 130         params->browser->tab_strip_model()->GetActiveWebContents();
 131   }
 132
 133   Profile* profile = params->initiating_profile;
 134
 135   switch (params->disposition) {
 136     case CURRENT_TAB:
 137       if (params->browser)
 138         return params->browser;
 139       // Find a compatible window and re-execute this command in it. Otherwise
 140       // re-run with NEW_WINDOW.
 141       return GetOrCreateBrowser(profile, params->host_desktop_type);
 142     case SINGLETON_TAB:
 143     case NEW_FOREGROUND_TAB:
 144     case NEW_BACKGROUND_TAB:
 145       // See if we can open the tab in the window this navigator is bound to.
 146       if (params->browser && WindowCanOpenTabs(params->browser))
 147         return params->browser;
 148       // Find a compatible window and re-execute this command in it. Otherwise
 149       // re-run with NEW_WINDOW.
 150       return GetOrCreateBrowser(profile, params->host_desktop_type);
 151     case NEW_POPUP: {
 152       // Make a new popup window.
 153       // Coerce app-style if |source| represents an app.
 154       std::string app_name;
 155 #if defined(ENABLE_EXTENSIONS)
 156       if (!params->extension_app_id.empty()) {
 157         app_name = web_app::GenerateApplicationNameFromExtensionId(
 158             params->extension_app_id);
 159       } else if (params->browser && !params->browser->app_name().empty()) {
 160         app_name = params->browser->app_name();
 161       } else if (params->source_contents) {
 162         extensions::TabHelper* extensions_tab_helper =
 163             extensions::TabHelper::FromWebContents(params->source_contents);
 164         if (extensions_tab_helper && extensions_tab_helper->is_app()) {
 165           app_name = web_app::GenerateApplicationNameFromExtensionId(
 166               extensions_tab_helper->extension_app()->id());
 167         }
 168       }
 169 #endif
 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.source_site_instance = params->source_site_instance;
 262   load_url_params.referrer = params->referrer;
 263   load_url_params.frame_tree_node_id = params->frame_tree_node_id;
 264   load_url_params.redirect_chain = params->redirect_chain;
 265   load_url_params.transition_type = params->transition;
 266   load_url_params.extra_headers = params->extra_headers;
 267   load_url_params.should_replace_current_entry =
 268       params->should_replace_current_entry;
 269
 270   if (params->transferred_global_request_id != GlobalRequestID()) {
 271     load_url_params.is_renderer_initiated = params->is_renderer_initiated;
 272     load_url_params.transferred_global_request_id =
 273         params->transferred_global_request_id;
 274   } else if (params->is_renderer_initiated) {
 275     load_url_params.is_renderer_initiated = true;
 276   }
 277
 278   // Only allows the browser-initiated navigation to use POST.
 279   if (params->uses_post && !params->is_renderer_initiated) {
 280     load_url_params.load_type =
 281         NavigationController::LOAD_TYPE_BROWSER_INITIATED_HTTP_POST;
 282     load_url_params.browser_initiated_post_data =
 283         params->browser_initiated_post_data;
 284   }
 285   target_contents->GetController().LoadURLWithParams(load_url_params);
 286 }
 287
 288 // This class makes sure the Browser object held in |params| is made visible
 289 // by the time it goes out of scope, provided |params| wants it to be shown.
 290 class ScopedBrowserShower {
 291  public:
 292   explicit ScopedBrowserShower(chrome::NavigateParams* params)
 293       : params_(params) {
 294   }
 295   ~ScopedBrowserShower() {
 296     if (params_->window_action ==
 297         chrome::NavigateParams::SHOW_WINDOW_INACTIVE) {
 298       params_->browser->window()->ShowInactive();
 299     } else if (params_->window_action == chrome::NavigateParams::SHOW_WINDOW) {
 300       params_->browser->window()->Show();
 301       // If a user gesture opened a popup window, focus the contents.
 302       if (params_->user_gesture && params_->disposition == NEW_POPUP &&
 303           params_->target_contents) {
 304         params_->target_contents->Focus();
 305       }
 306     }
 307   }
 308
 309  private:
 310   chrome::NavigateParams* params_;
 311   DISALLOW_COPY_AND_ASSIGN(ScopedBrowserShower);
 312 };
 313
 314 // This class manages the lifetime of a WebContents created by the
 315 // Navigate() function. When Navigate() creates a WebContents for a URL,
 316 // an instance of this class takes ownership of it via TakeOwnership() until the
 317 // WebContents is added to a tab strip at which time ownership is
 318 // relinquished via ReleaseOwnership(). If this object goes out of scope without
 319 // being added to a tab strip, the created WebContents is deleted to
 320 // avoid a leak and the params->target_contents field is set to NULL.
 321 class ScopedTargetContentsOwner {
 322  public:
 323   explicit ScopedTargetContentsOwner(chrome::NavigateParams* params)
 324       : params_(params) {
 325   }
 326   ~ScopedTargetContentsOwner() {
 327     if (target_contents_owner_.get())
 328       params_->target_contents = NULL;
 329   }
 330
 331   // Assumes ownership of |params_|' target_contents until ReleaseOwnership
 332   // is called.
 333   void TakeOwnership() {
 334     target_contents_owner_.reset(params_->target_contents);
 335   }
 336
 337   // Relinquishes ownership of |params_|' target_contents.
 338   WebContents* ReleaseOwnership() {
 339     return target_contents_owner_.release();
 340   }
 341
 342  private:
 343   chrome::NavigateParams* params_;
 344   scoped_ptr<WebContents> target_contents_owner_;
 345   DISALLOW_COPY_AND_ASSIGN(ScopedTargetContentsOwner);
 346 };
 347
 348 content::WebContents* CreateTargetContents(const chrome::NavigateParams& params,
 349                                            const GURL& url) {
 350   WebContents::CreateParams create_params(
 351       params.browser->profile(),
 352       tab_util::GetSiteInstanceForNewTab(params.browser->profile(), url));
 353   if (params.source_contents) {
 354     create_params.initial_size =
 355         params.source_contents->GetContainerBounds().size();
 356     if (params.should_set_opener)
 357       create_params.opener = params.source_contents;
 358   }
 359   if (params.disposition == NEW_BACKGROUND_TAB)
 360     create_params.initially_hidden = true;
 361
 362 #if defined(USE_AURA)
 363   if (params.browser->window() &&
 364       params.browser->window()->GetNativeWindow()) {
 365     create_params.context =
 366         params.browser->window()->GetNativeWindow();
 367   }
 368 #endif
 369
 370   WebContents* target_contents = WebContents::Create(create_params);
 371
 372   // New tabs can have WebUI URLs that will make calls back to arbitrary
 373   // tab helpers, so the entire set of tab helpers needs to be set up
 374   // immediately.
 375   BrowserNavigatorWebContentsAdoption::AttachTabHelpers(target_contents);
 376 #if defined(ENABLE_EXTENSIONS)
 377   extensions::TabHelper::FromWebContents(target_contents)->
 378       SetExtensionAppById(params.extension_app_id);
 379 #endif
 380   return target_contents;
 381 }
 382
 383 // If a prerendered page exists for |url|, replace the page at
 384 // |params->target_contents| with it and update to point to the swapped-in
 385 // WebContents.
 386 bool SwapInPrerender(const GURL& url, chrome::NavigateParams* params) {
 387   Profile* profile =
 388       Profile::FromBrowserContext(params->target_contents->GetBrowserContext());
 389   InstantSearchPrerenderer* prerenderer =
 390       InstantSearchPrerenderer::GetForProfile(profile);
 391   if (prerenderer && prerenderer->UsePrerenderedPage(url, params))
 392     return true;
 393
 394   prerender::PrerenderManager* prerender_manager =
 395       prerender::PrerenderManagerFactory::GetForProfile(profile);
 396   return prerender_manager &&
 397       prerender_manager->MaybeUsePrerenderedPage(url, params);
 398 }
 399
 400 chrome::HostDesktopType GetHostDesktop(Browser* browser) {
 401   if (browser)
 402     return browser->host_desktop_type();
 403   return chrome::GetActiveDesktop();
 404 }
 405
 406 }  // namespace
 407
 408 namespace chrome {
 409
 410 NavigateParams::NavigateParams(Browser* a_browser,
 411                                const GURL& a_url,
 412                                ui::PageTransition a_transition)
 413     : url(a_url),
 414       frame_tree_node_id(-1),
 415       uses_post(false),
 416       target_contents(NULL),
 417       source_contents(NULL),
 418       disposition(CURRENT_TAB),
 419       trusted_source(false),
 420       transition(a_transition),
 421       is_renderer_initiated(false),
 422       tabstrip_index(-1),
 423       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
 424       window_action(NO_ACTION),
 425       user_gesture(true),
 426       path_behavior(RESPECT),
 427       ref_behavior(IGNORE_REF),
 428       browser(a_browser),
 429       initiating_profile(NULL),
 430       host_desktop_type(GetHostDesktop(a_browser)),
 431       should_replace_current_entry(false),
 432       should_set_opener(false) {
 433 }
 434
 435 NavigateParams::NavigateParams(Browser* a_browser,
 436                                WebContents* a_target_contents)
 437     : frame_tree_node_id(-1),
 438       uses_post(false),
 439       target_contents(a_target_contents),
 440       source_contents(NULL),
 441       disposition(CURRENT_TAB),
 442       trusted_source(false),
 443       transition(ui::PAGE_TRANSITION_LINK),
 444       is_renderer_initiated(false),
 445       tabstrip_index(-1),
 446       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
 447       window_action(NO_ACTION),
 448       user_gesture(true),
 449       path_behavior(RESPECT),
 450       ref_behavior(IGNORE_REF),
 451       browser(a_browser),
 452       initiating_profile(NULL),
 453       host_desktop_type(GetHostDesktop(a_browser)),
 454       should_replace_current_entry(false),
 455       should_set_opener(false) {
 456 }
 457
 458 NavigateParams::NavigateParams(Profile* a_profile,
 459                                const GURL& a_url,
 460                                ui::PageTransition a_transition)
 461     : url(a_url),
 462       frame_tree_node_id(-1),
 463       uses_post(false),
 464       target_contents(NULL),
 465       source_contents(NULL),
 466       disposition(NEW_FOREGROUND_TAB),
 467       trusted_source(false),
 468       transition(a_transition),
 469       is_renderer_initiated(false),
 470       tabstrip_index(-1),
 471       tabstrip_add_types(TabStripModel::ADD_ACTIVE),
 472       window_action(SHOW_WINDOW),
 473       user_gesture(true),
 474       path_behavior(RESPECT),
 475       ref_behavior(IGNORE_REF),
 476       browser(NULL),
 477       initiating_profile(a_profile),
 478       host_desktop_type(chrome::GetActiveDesktop()),
 479       should_replace_current_entry(false),
 480       should_set_opener(false) {
 481 }
 482
 483 NavigateParams::~NavigateParams() {}
 484
 485 void FillNavigateParamsFromOpenURLParams(chrome::NavigateParams* nav_params,
 486                                          const content::OpenURLParams& params) {
 487   nav_params->referrer = params.referrer;
 488   nav_params->source_site_instance = params.source_site_instance;
 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       // Prerender can only swap in CURRENT_TAB navigations; others have
 627       // different sessionStorage namespaces.
 628       swapped_in_prerender = SwapInPrerender(params->url, params);
 629     }
 630
 631     if (user_initiated)
 632       params->target_contents->UserGestureDone();
 633
 634     if (!swapped_in_prerender) {
 635       // Try to handle non-navigational URLs that popup dialogs and such, these
 636       // should not actually navigate.
 637       if (!HandleNonNavigationAboutURL(params->url)) {
 638         // Perform the actual navigation, tracking whether it came from the
 639         // renderer.
 640
 641         LoadURLInContents(params->target_contents, params->url, params);
 642         // For prerender bookkeeping purposes, record that this pending navigate
 643         // originated from chrome::Navigate.
 644         content::NavigationEntry* entry =
 645             params->target_contents->GetController().GetPendingEntry();
 646         if (entry)
 647           entry->SetExtraData(prerender::kChromeNavigateExtraDataKey,
 648                               base::string16());
 649       }
 650     }
 651   } else {
 652     // |target_contents| was specified non-NULL, and so we assume it has already
 653     // been navigated appropriately. We need to do nothing more other than
 654     // add it to the appropriate tabstrip.
 655   }
 656
 657   // If the user navigated from the omnibox, and the selected tab is going to
 658   // lose focus, then make sure the focus for the source tab goes away from the
 659   // omnibox.
 660   if (params->source_contents &&
 661       (params->disposition == NEW_FOREGROUND_TAB ||
 662        params->disposition == NEW_WINDOW) &&
 663       (params->tabstrip_add_types & TabStripModel::ADD_INHERIT_OPENER))
 664     params->source_contents->Focus();
 665
 666   if (params->source_contents == params->target_contents ||
 667       (swapped_in_prerender && params->disposition == CURRENT_TAB)) {
 668     // The navigation occurred in the source tab.
 669     params->browser->UpdateUIForNavigationInTab(params->target_contents,
 670                                                 params->transition,
 671                                                 user_initiated);
 672   } else if (singleton_index == -1) {
 673     // If some non-default value is set for the index, we should tell the
 674     // TabStripModel to respect it.
 675     if (params->tabstrip_index != -1)
 676       params->tabstrip_add_types |= TabStripModel::ADD_FORCE_INDEX;
 677
 678     // The navigation should insert a new tab into the target Browser.
 679     params->browser->tab_strip_model()->AddWebContents(
 680         params->target_contents,
 681         params->tabstrip_index,
 682         params->transition,
 683         params->tabstrip_add_types);
 684     // Now that the |params->target_contents| is safely owned by the target
 685     // Browser's TabStripModel, we can release ownership.
 686     target_contents_owner.ReleaseOwnership();
 687   }
 688
 689   if (singleton_index >= 0) {
 690     WebContents* target =
 691         params->browser->tab_strip_model()->GetWebContentsAt(singleton_index);
 692
 693     if (target->IsCrashed()) {
 694       target->GetController().Reload(true);
 695     } else if (params->path_behavior == NavigateParams::IGNORE_AND_NAVIGATE &&
 696         target->GetURL() != params->url) {
 697       LoadURLInContents(target, params->url, params);
 698       // For prerender bookkeeping purposes, record that this pending navigate
 699       // originated from chrome::Navigate.
 700       content::NavigationEntry* entry =
 701           target->GetController().GetPendingEntry();
 702       if (entry)
 703         entry->SetExtraData(prerender::kChromeNavigateExtraDataKey,
 704                             base::string16());
 705     }
 706
 707     // If the singleton tab isn't already selected, select it.
 708     if (params->source_contents != params->target_contents) {
 709       params->browser->tab_strip_model()->ActivateTabAt(singleton_index,
 710                                                         user_initiated);
 711     }
 712   }
 713
 714   if (params->disposition != CURRENT_TAB) {
 715     content::NotificationService::current()->Notify(
 716         chrome::NOTIFICATION_TAB_ADDED,
 717         content::Source<content::WebContentsDelegate>(params->browser),
 718         content::Details<WebContents>(params->target_contents));
 719   }
 720 }
 721
 722 bool IsURLAllowedInIncognito(const GURL& url,
 723                              content::BrowserContext* browser_context) {
 724   if (url.scheme() == content::kViewSourceScheme) {
 725     // A view-source URL is allowed in incognito mode only if the URL itself
 726     // is allowed in incognito mode. Remove the "view-source:" from the start
 727     // of the URL and validate the rest.
 728     std::string stripped_spec = url.spec();
 729     DCHECK_GT(stripped_spec.size(), strlen(content::kViewSourceScheme));
 730     stripped_spec.erase(0, strlen(content::kViewSourceScheme) + 1);
 731     GURL stripped_url(stripped_spec);
 732     return stripped_url.is_valid() &&
 733         IsURLAllowedInIncognito(stripped_url, browser_context);
 734   }
 735   // Most URLs are allowed in incognito; the following are exceptions.
 736   // chrome://extensions is on the list because it redirects to
 737   // chrome://settings.
 738   if (url.scheme() == content::kChromeUIScheme &&
 739       (url.host() == chrome::kChromeUISettingsHost ||
 740        url.host() == chrome::kChromeUISettingsFrameHost ||
 741        url.host() == chrome::kChromeUIHelpHost ||
 742        url.host() == chrome::kChromeUIExtensionsHost ||
 743        url.host() == chrome::kChromeUIBookmarksHost ||
 744 #if !defined(OS_CHROMEOS)
 745        url.host() == chrome::kChromeUIChromeSigninHost ||
 746 #endif
 747        url.host() == chrome::kChromeUIUberHost ||
 748        url.host() == chrome::kChromeUIThumbnailHost ||
 749        url.host() == chrome::kChromeUIThumbnailHost2 ||
 750        url.host() == chrome::kChromeUIThumbnailListHost ||
 751        url.host() == chrome::kChromeUISuggestionsHost ||
 752        url.host() == chrome::kChromeUIDevicesHost ||
 753        url.host() == chrome::kChromeUIVoiceSearchHost)) {
 754     return false;
 755   }
 756
 757   if (url.scheme() == chrome::kChromeSearchScheme &&
 758       (url.host() == chrome::kChromeUIThumbnailHost ||
 759        url.host() == chrome::kChromeUIThumbnailHost2 ||
 760        url.host() == chrome::kChromeUIThumbnailListHost ||
 761        url.host() == chrome::kChromeUISuggestionsHost)) {
 762     return false;
 763   }
 764
 765   GURL rewritten_url = url;
 766   bool reverse_on_redirect = false;
 767   content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
 768       &rewritten_url, browser_context, &reverse_on_redirect);
 769
 770   // Some URLs are mapped to uber subpages. Do not allow them in incognito.
 771   return !(rewritten_url.scheme() == content::kChromeUIScheme &&
 772            rewritten_url.host() == chrome::kChromeUIUberHost);
 773 }
 774
 775 }  // namespace chrome