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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_BLOCKED_CONTENT_TAB_UNDER_NAVIGATION_THROTTLE_H_
#define CHROME_BROWSER_UI_BLOCKED_CONTENT_TAB_UNDER_NAVIGATION_THROTTLE_H_
#include "base/feature_list.h"
#include "content/public/browser/navigation_throttle.h"
namespace content {
class NavigationThrottleRegistry;
}
inline constexpr char kBlockTabUnderFormatMessage[] =
"Chrome stopped this site from navigating to %s, see "
"https://www.chromestatus.com/feature/5675755719622656 for more details.";
// This class blocks navigations that we've classified as tab-unders. It does so
// by communicating with the popup opener tab helper.
//
// Currently, navigations are considered tab-unders if:
// 1. It is a navigation that is "suspicious"
// a. It has no user gesture.
// b. It is renderer-initiated.
// c. It is cross site to the last committed URL in the tab.
// d. The navigation started in the background.
// 2. The tab has opened a popup and hasn't received a user gesture since then.
// This information is tracked by the PopupOpenerTabHelper.
//
// TODO(csharrison): Unfortunately, the provision that a navigation must start
// in the background to be considered a tab-under restricts the scope of the
// intervention. For instance, popups that do not completely hide the original
// page may cause subsequent tab-under navigations to occur while visible (not
// compeltely backgrounded). See https://crbug.com/733736.
//
// For now, we allow these tab-unders because this pattern seems to be
// legitimate for some cases (like auth).
class TabUnderNavigationThrottle : public content::NavigationThrottle {
public:
// This enum backs a histogram. Update enums.xml if you make any updates, and
// put new entries before |kLast|.
enum class Action {
// Logged at WillStartRequest.
kStarted,
// Logged when a navigation is blocked.
kBlocked,
// Logged at the same time as kBlocked, but will additionally be logged even
// if the experiment is turned off.
kDidTabUnder,
// The user clicked through to navigate to the blocked redirect.
kClickedThrough,
// The user did not navigate to the blocked redirect and closed the message.
// This only gets logged when the user takes action on the UI, not when it
// gets automatically dismissed by a navigation for example.
kAcceptedIntervention,
kCount
};
static void MaybeCreateAndAdd(content::NavigationThrottleRegistry& registry);
TabUnderNavigationThrottle(const TabUnderNavigationThrottle&) = delete;
TabUnderNavigationThrottle& operator=(const TabUnderNavigationThrottle&) =
delete;
~TabUnderNavigationThrottle() override;
private:
explicit TabUnderNavigationThrottle(
content::NavigationThrottleRegistry& registry);
// This method is described at the top of this file.
//
// Note: This method must be called before navigation commit.
bool IsSuspiciousClientRedirect() const;
content::NavigationThrottle::ThrottleCheckResult MaybeBlockNavigation();
void ShowUI();
bool HasOpenedPopupSinceLastUserGesture() const;
// content::NavigationThrottle:
content::NavigationThrottle::ThrottleCheckResult WillStartRequest() override;
content::NavigationThrottle::ThrottleCheckResult WillRedirectRequest()
override;
const char* GetNameForLogging() override;
// Tracks whether this WebContents has opened a popup since the last user
// gesture, at the time this navigation is starting.
const bool has_opened_popup_since_last_user_gesture_at_start_ = false;
// Whether this object was created when the hosting WebContents had visibility
// content::Visibility::VISIBLE.
const bool started_in_foreground_ = false;
// True if the throttle has seen a tab under.
bool seen_tab_under_ = false;
};
#endif // CHROME_BROWSER_UI_BLOCKED_CONTENT_TAB_UNDER_NAVIGATION_THROTTLE_H_
|
