content/browser/frame_host/navigation_controller_impl.h

   1 // Copyright 2013 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 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
   6 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
   7
   8 #include "base/callback.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/gtest_prod_util.h"
  11 #include "base/memory/linked_ptr.h"
  12 #include "base/time/time.h"
  13 #include "build/build_config.h"
  14 #include "content/browser/frame_host/navigation_controller_delegate.h"
  15 #include "content/browser/ssl/ssl_manager.h"
  16 #include "content/public/browser/navigation_controller.h"
  17 #include "content/public/browser/navigation_type.h"
  18
  19 struct ViewHostMsg_FrameNavigate_Params;
  20
  21 namespace content {
  22 class NavigationEntryImpl;
  23 class RenderViewHost;
  24 class NavigationEntryScreenshotManager;
  25 class SiteInstance;
  26 struct LoadCommittedDetails;
  27
  28 class CONTENT_EXPORT NavigationControllerImpl
  29     : public NON_EXPORTED_BASE(NavigationController) {
  30  public:
  31   NavigationControllerImpl(
  32       NavigationControllerDelegate* delegate,
  33       BrowserContext* browser_context);
  34   virtual ~NavigationControllerImpl();
  35
  36   // NavigationController implementation:
  37   virtual WebContents* GetWebContents() const OVERRIDE;
  38   virtual BrowserContext* GetBrowserContext() const OVERRIDE;
  39   virtual void SetBrowserContext(
  40       BrowserContext* browser_context) OVERRIDE;
  41   virtual void Restore(
  42       int selected_navigation,
  43       RestoreType type,
  44       std::vector<NavigationEntry*>* entries) OVERRIDE;
  45   virtual NavigationEntry* GetActiveEntry() const OVERRIDE;
  46   virtual NavigationEntry* GetVisibleEntry() const OVERRIDE;
  47   virtual int GetCurrentEntryIndex() const OVERRIDE;
  48   virtual NavigationEntry* GetLastCommittedEntry() const OVERRIDE;
  49   virtual int GetLastCommittedEntryIndex() const OVERRIDE;
  50   virtual bool CanViewSource() const OVERRIDE;
  51   virtual int GetEntryCount() const OVERRIDE;
  52   virtual NavigationEntry* GetEntryAtIndex(int index) const OVERRIDE;
  53   virtual NavigationEntry* GetEntryAtOffset(int offset) const OVERRIDE;
  54   virtual void DiscardNonCommittedEntries() OVERRIDE;
  55   virtual NavigationEntry* GetPendingEntry() const OVERRIDE;
  56   virtual int GetPendingEntryIndex() const OVERRIDE;
  57   virtual NavigationEntry* GetTransientEntry() const OVERRIDE;
  58   virtual void SetTransientEntry(NavigationEntry* entry) OVERRIDE;
  59   virtual void LoadURL(const GURL& url,
  60                        const Referrer& referrer,
  61                        PageTransition type,
  62                        const std::string& extra_headers) OVERRIDE;
  63   virtual void LoadURLWithParams(const LoadURLParams& params) OVERRIDE;
  64   virtual void LoadIfNecessary() OVERRIDE;
  65   virtual bool CanGoBack() const OVERRIDE;
  66   virtual bool CanGoForward() const OVERRIDE;
  67   virtual bool CanGoToOffset(int offset) const OVERRIDE;
  68   virtual void GoBack() OVERRIDE;
  69   virtual void GoForward() OVERRIDE;
  70   virtual void GoToIndex(int index) OVERRIDE;
  71   virtual void GoToOffset(int offset) OVERRIDE;
  72   virtual bool RemoveEntryAtIndex(int index) OVERRIDE;
  73   virtual const SessionStorageNamespaceMap&
  74       GetSessionStorageNamespaceMap() const OVERRIDE;
  75   virtual SessionStorageNamespace*
  76       GetDefaultSessionStorageNamespace() OVERRIDE;
  77   virtual void SetMaxRestoredPageID(int32 max_id) OVERRIDE;
  78   virtual int32 GetMaxRestoredPageID() const OVERRIDE;
  79   virtual bool NeedsReload() const OVERRIDE;
  80   virtual void SetNeedsReload() OVERRIDE;
  81   virtual void CancelPendingReload() OVERRIDE;
  82   virtual void ContinuePendingReload() OVERRIDE;
  83   virtual bool IsInitialNavigation() const OVERRIDE;
  84   virtual void Reload(bool check_for_repost) OVERRIDE;
  85   virtual void ReloadIgnoringCache(bool check_for_repost) OVERRIDE;
  86   virtual void ReloadOriginalRequestURL(bool check_for_repost) OVERRIDE;
  87   virtual void NotifyEntryChanged(const NavigationEntry* entry,
  88                                  int index) OVERRIDE;
  89   virtual void CopyStateFrom(
  90       const NavigationController& source) OVERRIDE;
  91   virtual void CopyStateFromAndPrune(NavigationController* source,
  92                                      bool replace_entry) OVERRIDE;
  93   virtual bool CanPruneAllButLastCommitted() OVERRIDE;
  94   virtual void PruneAllButLastCommitted() OVERRIDE;
  95   virtual void ClearAllScreenshots() OVERRIDE;
  96
  97   // The session storage namespace that all child RenderViews belonging to
  98   // |instance| should use.
  99   SessionStorageNamespace* GetSessionStorageNamespace(
 100       SiteInstance* instance);
 101
 102   // Returns the index of the specified entry, or -1 if entry is not contained
 103   // in this NavigationController.
 104   int GetIndexOfEntry(const NavigationEntryImpl* entry) const;
 105
 106   // Return the index of the entry with the corresponding instance and page_id,
 107   // or -1 if not found.
 108   int GetEntryIndexWithPageID(SiteInstance* instance,
 109                               int32 page_id) const;
 110
 111   // Return the entry with the corresponding instance and page_id, or NULL if
 112   // not found.
 113   NavigationEntryImpl* GetEntryWithPageID(
 114       SiteInstance* instance,
 115       int32 page_id) const;
 116
 117   NavigationControllerDelegate* delegate() const {
 118     return delegate_;
 119   }
 120
 121   // For use by WebContentsImpl ------------------------------------------------
 122
 123   // Allow renderer-initiated navigations to create a pending entry when the
 124   // provisional load starts.
 125   void SetPendingEntry(content::NavigationEntryImpl* entry);
 126
 127   // Handles updating the navigation state after the renderer has navigated.
 128   // This is used by the WebContentsImpl.
 129   //
 130   // If a new entry is created, it will return true and will have filled the
 131   // given details structure and broadcast the NOTIFY_NAV_ENTRY_COMMITTED
 132   // notification. The caller can then use the details without worrying about
 133   // listening for the notification.
 134   //
 135   // In the case that nothing has changed, the details structure is undefined
 136   // and it will return false.
 137   //
 138   // TODO(creis): Change RenderViewHost to RenderFrameHost.
 139   bool RendererDidNavigate(RenderViewHost* rvh,
 140                            const ViewHostMsg_FrameNavigate_Params& params,
 141                            LoadCommittedDetails* details);
 142
 143   // Notifies us that we just became active. This is used by the WebContentsImpl
 144   // so that we know to load URLs that were pending as "lazy" loads.
 145   void SetActive(bool is_active);
 146
 147   // Returns true if the given URL would be an in-page navigation (i.e. only
 148   // the reference fragment is different) from the "last committed entry". We do
 149   // not compare it against the "active entry" since the active entry can be
 150   // pending and in page navigations only happen on committed pages. If there
 151   // is no last committed entry, then nothing will be in-page.
 152   //
 153   // Special note: if the URLs are the same, it does NOT automatically count as
 154   // an in-page navigation. Neither does an input URL that has no ref, even if
 155   // the rest is the same. This may seem weird, but when we're considering
 156   // whether a navigation happened without loading anything, the same URL could
 157   // be a reload, while only a different ref would be in-page (pages can't clear
 158   // refs without reload, only change to "#" which we don't count as empty).
 159   bool IsURLInPageNavigation(const GURL& url) const {
 160     return IsURLInPageNavigation(url, false, NAVIGATION_TYPE_UNKNOWN);
 161   }
 162
 163   // The situation is made murkier by history.replaceState(), which could
 164   // provide the same URL as part of an in-page navigation, not a reload. So
 165   // we need this form which lets the (untrustworthy) renderer resolve the
 166   // ambiguity, but only when the URLs are equal. This should be safe since the
 167   // origin isn't changing.
 168   bool IsURLInPageNavigation(
 169       const GURL& url,
 170       bool renderer_says_in_page,
 171       NavigationType navigation_type) const;
 172
 173   // Sets the SessionStorageNamespace for the given |partition_id|. This is
 174   // used during initialization of a new NavigationController to allow
 175   // pre-population of the SessionStorageNamespace objects. Session restore,
 176   // prerendering, and the implementaion of window.open() are the primary users
 177   // of this API.
 178   //
 179   // Calling this function when a SessionStorageNamespace has already been
 180   // associated with a |partition_id| will CHECK() fail.
 181   void SetSessionStorageNamespace(
 182       const std::string& partition_id,
 183       SessionStorageNamespace* session_storage_namespace);
 184
 185   // Random data ---------------------------------------------------------------
 186
 187   SSLManager* ssl_manager() { return &ssl_manager_; }
 188
 189   // Maximum number of entries before we start removing entries from the front.
 190   static void set_max_entry_count_for_testing(size_t max_entry_count) {
 191     max_entry_count_for_testing_ = max_entry_count;
 192   }
 193   static size_t max_entry_count();
 194
 195   void SetGetTimestampCallbackForTest(
 196       const base::Callback<base::Time()>& get_timestamp_callback);
 197
 198   // Takes a screenshot of the page at the current state.
 199   void TakeScreenshot();
 200
 201   // Sets the screenshot manager for this NavigationControllerImpl. The
 202   // controller takes ownership of the screenshot manager and destroys it when
 203   // a new screenshot-manager is set, or when the controller is destroyed.
 204   // Setting a NULL manager recreates the default screenshot manager and uses
 205   // that.
 206   void SetScreenshotManager(NavigationEntryScreenshotManager* manager);
 207
 208   // Discards only the pending entry.
 209   void DiscardPendingEntry();
 210
 211  private:
 212   friend class RestoreHelper;
 213
 214   FRIEND_TEST_ALL_PREFIXES(NavigationControllerTest,
 215                            PurgeScreenshot);
 216   FRIEND_TEST_ALL_PREFIXES(TimeSmoother, Basic);
 217   FRIEND_TEST_ALL_PREFIXES(TimeSmoother, SingleDuplicate);
 218   FRIEND_TEST_ALL_PREFIXES(TimeSmoother, ManyDuplicates);
 219   FRIEND_TEST_ALL_PREFIXES(TimeSmoother, ClockBackwardsJump);
 220
 221   // Helper class to smooth out runs of duplicate timestamps while still
 222   // allowing time to jump backwards.
 223   class CONTENT_EXPORT TimeSmoother {
 224    public:
 225     // Returns |t| with possibly some time added on.
 226     base::Time GetSmoothedTime(base::Time t);
 227
 228    private:
 229     // |low_water_mark_| is the first time in a sequence of adjusted
 230     // times and |high_water_mark_| is the last.
 231     base::Time low_water_mark_;
 232     base::Time high_water_mark_;
 233   };
 234
 235   // Classifies the given renderer navigation (see the NavigationType enum).
 236   NavigationType ClassifyNavigation(
 237       RenderViewHost* rvh,
 238       const ViewHostMsg_FrameNavigate_Params& params) const;
 239
 240   // Causes the controller to load the specified entry. The function assumes
 241   // ownership of the pointer since it is put in the navigation list.
 242   // NOTE: Do not pass an entry that the controller already owns!
 243   void LoadEntry(NavigationEntryImpl* entry);
 244
 245   // Handlers for the different types of navigation types. They will actually
 246   // handle the navigations corresponding to the different NavClasses above.
 247   // They will NOT broadcast the commit notification, that should be handled by
 248   // the caller.
 249   //
 250   // RendererDidNavigateAutoSubframe is special, it may not actually change
 251   // anything if some random subframe is loaded. It will return true if anything
 252   // changed, or false if not.
 253   //
 254   // The functions taking |did_replace_entry| will fill into the given variable
 255   // whether the last entry has been replaced or not.
 256   // See LoadCommittedDetails.did_replace_entry.
 257   //
 258   // TODO(creis): Change RenderViewHost to RenderFrameHost.
 259   void RendererDidNavigateToNewPage(
 260       RenderViewHost* rvh,
 261       const ViewHostMsg_FrameNavigate_Params& params,
 262       bool replace_entry);
 263   void RendererDidNavigateToExistingPage(
 264       RenderViewHost* rvh,
 265       const ViewHostMsg_FrameNavigate_Params& params);
 266   void RendererDidNavigateToSamePage(
 267       RenderViewHost* rvh,
 268       const ViewHostMsg_FrameNavigate_Params& params);
 269   void RendererDidNavigateInPage(
 270       RenderViewHost* rvh,
 271       const ViewHostMsg_FrameNavigate_Params& params,
 272       bool* did_replace_entry);
 273   void RendererDidNavigateNewSubframe(
 274       RenderViewHost* rvh,
 275       const ViewHostMsg_FrameNavigate_Params& params);
 276   bool RendererDidNavigateAutoSubframe(
 277       RenderViewHost* rvh,
 278       const ViewHostMsg_FrameNavigate_Params& params);
 279
 280   // Helper function for code shared between Reload() and ReloadIgnoringCache().
 281   void ReloadInternal(bool check_for_repost, ReloadType reload_type);
 282
 283   // Actually issues the navigation held in pending_entry.
 284   void NavigateToPendingEntry(ReloadType reload_type);
 285
 286   // Allows the derived class to issue notifications that a load has been
 287   // committed. This will fill in the active entry to the details structure.
 288   void NotifyNavigationEntryCommitted(LoadCommittedDetails* details);
 289
 290   // Updates the virtual URL of an entry to match a new URL, for cases where
 291   // the real renderer URL is derived from the virtual URL, like view-source:
 292   void UpdateVirtualURLToURL(NavigationEntryImpl* entry,
 293                              const GURL& new_url);
 294
 295   // Invoked after session/tab restore or cloning a tab. Resets the transition
 296   // type of the entries, updates the max page id and creates the active
 297   // contents.
 298   void FinishRestore(int selected_index, RestoreType type);
 299
 300   // Inserts a new entry or replaces the current entry with a new one, removing
 301   // all entries after it. The new entry will become the active one.
 302   void InsertOrReplaceEntry(NavigationEntryImpl* entry, bool replace);
 303
 304   // Removes the entry at |index|, as long as it is not the current entry.
 305   void RemoveEntryAtIndexInternal(int index);
 306
 307   // Discards both the pending and transient entries.
 308   void DiscardNonCommittedEntriesInternal();
 309
 310   // Discards only the transient entry.
 311   void DiscardTransientEntry();
 312
 313   // If we have the maximum number of entries, remove the oldest one in
 314   // preparation to add another.
 315   void PruneOldestEntryIfFull();
 316
 317   // Removes all entries except the last committed entry.  If there is a new
 318   // pending navigation it is preserved. In contrast to
 319   // PruneAllButLastCommitted() this does not update the session history of the
 320   // RenderView.  Callers must ensure that |CanPruneAllButLastCommitted| returns
 321   // true before calling this.
 322   void PruneAllButLastCommittedInternal();
 323
 324   // Returns true if the navigation is likley to be automatic rather than
 325   // user-initiated.
 326   bool IsLikelyAutoNavigation(base::TimeTicks now);
 327
 328   // Inserts up to |max_index| entries from |source| into this. This does NOT
 329   // adjust any of the members that reference entries_
 330   // (last_committed_entry_index_, pending_entry_index_ or
 331   // transient_entry_index_).
 332   void InsertEntriesFrom(const NavigationControllerImpl& source, int max_index);
 333
 334   // Returns the navigation index that differs from the current entry by the
 335   // specified |offset|.  The index returned is not guaranteed to be valid.
 336   int GetIndexForOffset(int offset) const;
 337
 338   // ---------------------------------------------------------------------------
 339
 340   // The user browser context associated with this controller.
 341   BrowserContext* browser_context_;
 342
 343   // List of NavigationEntry for this tab
 344   typedef std::vector<linked_ptr<NavigationEntryImpl> > NavigationEntries;
 345   NavigationEntries entries_;
 346
 347   // An entry we haven't gotten a response for yet.  This will be discarded
 348   // when we navigate again.  It's used only so we know what the currently
 349   // displayed tab is.
 350   //
 351   // This may refer to an item in the entries_ list if the pending_entry_index_
 352   // == -1, or it may be its own entry that should be deleted. Be careful with
 353   // the memory management.
 354   NavigationEntryImpl* pending_entry_;
 355
 356   // currently visible entry
 357   int last_committed_entry_index_;
 358
 359   // index of pending entry if it is in entries_, or -1 if pending_entry_ is a
 360   // new entry (created by LoadURL).
 361   int pending_entry_index_;
 362
 363   // The index for the entry that is shown until a navigation occurs.  This is
 364   // used for interstitial pages. -1 if there are no such entry.
 365   // Note that this entry really appears in the list of entries, but only
 366   // temporarily (until the next navigation).  Any index pointing to an entry
 367   // after the transient entry will become invalid if you navigate forward.
 368   int transient_entry_index_;
 369
 370   // The delegate associated with the controller. Possibly NULL during
 371   // setup.
 372   NavigationControllerDelegate* delegate_;
 373
 374   // The max restored page ID in this controller, if it was restored.  We must
 375   // store this so that WebContentsImpl can tell any renderer in charge of one
 376   // of the restored entries to update its max page ID.
 377   int32 max_restored_page_id_;
 378
 379   // Manages the SSL security UI.
 380   SSLManager ssl_manager_;
 381
 382   // Whether we need to be reloaded when made active.
 383   bool needs_reload_;
 384
 385   // Whether this is the initial navigation.
 386   // Becomes false when initial navigation commits.
 387   bool is_initial_navigation_;
 388
 389   // Used to find the appropriate SessionStorageNamespace for the storage
 390   // partition of a NavigationEntry.
 391   //
 392   // A NavigationController may contain NavigationEntries that correspond to
 393   // different StoragePartitions. Even though they are part of the same
 394   // NavigationController, only entries in the same StoragePartition may
 395   // share session storage state with one another.
 396   SessionStorageNamespaceMap session_storage_namespace_map_;
 397
 398   // The maximum number of entries that a navigation controller can store.
 399   static size_t max_entry_count_for_testing_;
 400
 401   // If a repost is pending, its type (RELOAD or RELOAD_IGNORING_CACHE),
 402   // NO_RELOAD otherwise.
 403   ReloadType pending_reload_;
 404
 405   // Used to get timestamps for newly-created navigation entries.
 406   base::Callback<base::Time()> get_timestamp_callback_;
 407
 408   // Used to smooth out timestamps from |get_timestamp_callback_|.
 409   // Without this, whenever there is a run of redirects or
 410   // code-generated navigations, those navigations may occur within
 411   // the timer resolution, leading to things sometimes showing up in
 412   // the wrong order in the history view.
 413   TimeSmoother time_smoother_;
 414
 415   scoped_ptr<NavigationEntryScreenshotManager> screenshot_manager_;
 416
 417   DISALLOW_COPY_AND_ASSIGN(NavigationControllerImpl);
 418 };
 419
 420 }  // namespace content
 421
 422 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_