Open a login tab on captive portal detection on SSL loads.

chrome/browser/captive_portal/captive_portal_tab_reloader.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_CAPTIVE_PORTAL_CAPTIVE_PORTAL_TAB_RELOADER_H_
+#define CHROME_BROWSER_CAPTIVE_PORTAL_CAPTIVE_PORTAL_TAB_RELOADER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
+#include "base/time.h"
+#include "base/timer.h"
+#include "chrome/browser/captive_portal/captive_portal_service.h"
+
+class Profile;
+
+namespace content {
+class WebContents;
+}
+
+namespace captive_portal {
+
+// Keeps track of whether a tab has encountered a navigation error caused by a
+// captive portal.  Also triggers captive portal checks when a page load may
+// have been broken or be taking longer due to a captive portal.  All methods
+// may only be called on the UI thread.
+//
+// Only supports SSL main frames which time out in response to captive portals,
+// since these make for a particularly bad user experience.  Non-SSL requests
+// are intercepted by captive portals, which take users to the login page.  SSL
+// requests, however, are generally silently blackholed.  They then take a
+// while to timeout, and will timeout again when refreshed.
+class CaptivePortalTabReloader {
+ public:
+  enum State {
+    STATE_NONE,
+    // The slow load timer is running.  Only started on SSL provisional loads.
+    // If the timer triggers before the page has been committed, a captive
+    // portal test will be requested.
+    STATE_TIMER_RUNNING,
+    // The tab may have been broken by a captive portal.  A tab switches to
+    // this state either on an ERR_CONNECTION_TIMEOUT of an SSL page or when
+    // an SSL request takes too long to commit.  The tab will remain in this
+    // state until the current load succeeds, a new provisional load starts,
+    // or it gets a captive portal result.
+    STATE_MAYBE_BROKEN_BY_PORTAL,
+    // The TabHelper switches to this state from STATE_MAYBE_BROKEN_BY_PORTAL in
+    // response to a RESULT_BEHIND_CAPTIVE_PORTAL.  The tab will remain in this
+    // state until a new provisional load starts, the original load successfully
+    // commits, the current load is aborted, or the tab reloads the page in
+    // response to receiving a captive portal result other than
+    // RESULT_BEHIND_CAPTIVE_PORTAL.
+    STATE_BROKEN_BY_PORTAL,
+    // The page may need to be reloaded.  The tab will be reloaded if the page
+    // fails the next load with a timeout, or immediately upon switching to this
+    // state, if the page already timed out.  If anything else happens
+    // when in this state (Another error, successful navigation, or the original
+    // navigation was aborted), the TabHelper transitions to STATE_NONE without
+    // reloading.
+    STATE_NEEDS_RELOAD,
+  };
+
+  // Function to open a login tab, if there isn't one already.
+  typedef base::Callback<void()> OpenLoginTabCallback;
+
+  // |profile| and |web_contents| will only be dereferenced in ReloadTab,
+  // MaybeOpenCaptivePortalLoginTab, and CheckForCaptivePortal, so they can
+  // both be NULL in the unit tests as long as those functions are not called.
+  CaptivePortalTabReloader(Profile* profile,
+                           content::WebContents* web_contents,
+                           const OpenLoginTabCallback& open_login_tab_callback);
+
+  virtual ~CaptivePortalTabReloader();
+
+  // The following 4 functions are all invoked by the CaptivePortalTabHelper:
+
+  // Called when a non-error main frame load starts.  Resets current state,
+  // unless this is a login tab.  Each load will eventually result in a call to
+  // OnLoadCommitted or OnAbort.  The former will be called both on successful
+  // loads and for error pages.
+  virtual void OnLoadStart(bool is_ssl);
+
+  // Called when a page is committed.  |net_error| will be net::OK in the case
+  // of a successful load.  For an errror page, the entire 3-step process of
+  // getting the error, starting a new provisional load for the error page, and
+  // committing the error page is treated as a single commit.
+  //
+  // The Link Doctor page will typically be one OnLoadCommitted with an error
+  // code, followed by another OnLoadCommitted with net::OK for the Link Doctor
+  // page.
+  virtual void OnLoadCommitted(int net_error);
+
+  // This is called when the current provisional load is canceled.
+  // Sets state to STATE_NONE, unless this is a login tab.
+  virtual void OnAbort();
+
+  // Called by CaptivePortalTabHelper whenever a captive portal test completes.
+  virtual void OnCaptivePortalResults(Result previous_result, Result result);
+
+ protected:
+  // The following functions are used only when testing:
+
+  State state() const { return state_; }
+
+  void set_slow_ssl_load_time(base::TimeDelta slow_ssl_load_time) {
+    slow_ssl_load_time_ = slow_ssl_load_time;
+  }
+
+  // Started whenever an SSL tab starts loading, when the state is switched to
+  // STATE_TIMER_RUNNING.  Stopped on any state change, including when a page
+  // commits or there's an error.  If the timer triggers, the state switches to
+  // STATE_MAYBE_BROKEN_BY_PORTAL and |this| kicks off a captive portal check.
+  // TODO(mmenke):  On redirects, update this timer.
+  base::OneShotTimer<CaptivePortalTabReloader> slow_ssl_load_timer_;
+
+ private:
+  friend class CaptivePortalBrowserTest;
+
+  // Sets |state_| and takes any action associated with the new state.  Also
+  // stops the timer, if needed.
+  void SetState(State new_state);
+
+  // Called by a timer when an SSL main frame provisional load is taking a
+  // while to commit.
+  void OnSlowSSLConnect();
+
+  // Reloads the tab if there's no provisional load going on and the current
+  // state is STATE_NEEDS_RELOAD.  Not safe to call synchronously when called
+  // by from a WebContentsObserver function, since the WebContents is currently
+  // performing some action.
+  void ReloadTabIfNeeded();
+
+  // Reloads the tab.
+  virtual void ReloadTab();
+
+  // Opens a login tab in the topmost browser window for the |profile_|, if the
+  // profile has a tabbed browser window and the window doesn't already have a
+  // login tab.  Otherwise, does nothing.
+  virtual void MaybeOpenCaptivePortalLoginTab();
+
+  // Tries to get |profile_|'s CaptivePortalService and have it start a captive
+  // portal check.
+  virtual void CheckForCaptivePortal();
+
+  Profile* profile_;
+  content::WebContents* web_contents_;
+
+  State state_;
+
+  // Tracks if there's a load going on that can't safely be interrupted.  This
+  // is true between the time when a provisional load fails and when an error
+  // page's provisional load starts, so does not perfectly align with the
+  // notion of a provisional load used by the WebContents.
+  bool provisional_main_frame_load_;
+
+  // Time to wait after a provisional HTTPS load before triggering a captive
+  // portal check.
+  base::TimeDelta slow_ssl_load_time_;
+
+  const OpenLoginTabCallback open_login_tab_callback_;
+
+  base::WeakPtrFactory<CaptivePortalTabReloader> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(CaptivePortalTabReloader);
+};
+
+}  // namespace captive_portal
+
+#endif  // CHROME_BROWSER_CAPTIVE_PORTAL_CAPTIVE_PORTAL_TAB_RELOADER_H_