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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/core/loader/navigation_policy.h"
#include "build/build_config.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/input/web_keyboard_event.h"
#include "third_party/blink/public/common/input/web_mouse_event.h"
#include "third_party/blink/public/web/web_navigation_policy.h"
#include "third_party/blink/public/web/web_window_features.h"
#include "third_party/blink/renderer/core/events/current_input_event.h"
#include "third_party/blink/renderer/core/events/gesture_event.h"
#include "third_party/blink/renderer/core/events/keyboard_event.h"
#include "third_party/blink/renderer/core/events/mouse_event.h"
#include "third_party/blink/renderer/core/events/ui_event_with_key_state.h"
#include "third_party/blink/renderer/platform/keyboard_codes.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"
namespace blink {
namespace {
NavigationPolicy NavigationPolicyFromEventModifiers(
int16_t button,
bool ctrl,
bool shift,
bool alt,
bool meta,
bool is_link_preview_enabled) {
#if BUILDFLAG(IS_MAC)
const bool new_tab_modifier = (button == 1) || meta;
#else
const bool new_tab_modifier = (button == 1) || ctrl;
#endif
if (!new_tab_modifier && !shift && !alt) {
return kNavigationPolicyCurrentTab;
} else if (is_link_preview_enabled && !new_tab_modifier && !shift && alt) {
return kNavigationPolicyLinkPreview;
} else if (new_tab_modifier) {
return shift ? kNavigationPolicyNewForegroundTab
: kNavigationPolicyNewBackgroundTab;
}
return shift ? kNavigationPolicyNewWindow : kNavigationPolicyDownload;
}
NavigationPolicy NavigationPolicyFromEventInternal(
const Event* event,
bool is_link_preview_enabled) {
if (!event)
return kNavigationPolicyCurrentTab;
if (const auto* mouse_event = DynamicTo<MouseEvent>(event)) {
return NavigationPolicyFromEventModifiers(
mouse_event->button(), mouse_event->ctrlKey(), mouse_event->shiftKey(),
mouse_event->altKey(), mouse_event->metaKey(), is_link_preview_enabled);
} else if (const KeyboardEvent* key_event = DynamicTo<KeyboardEvent>(event)) {
// The click is simulated when triggering the keypress event.
return NavigationPolicyFromEventModifiers(
0, key_event->ctrlKey(), key_event->shiftKey(), key_event->altKey(),
key_event->metaKey(), is_link_preview_enabled);
} else if (const auto* gesture_event = DynamicTo<GestureEvent>(event)) {
// The click is simulated when triggering the gesture-tap event
return NavigationPolicyFromEventModifiers(
0, gesture_event->ctrlKey(), gesture_event->shiftKey(),
gesture_event->altKey(), gesture_event->metaKey(),
is_link_preview_enabled);
}
return kNavigationPolicyCurrentTab;
}
NavigationPolicy NavigationPolicyFromCurrentEvent(
bool is_link_preview_enabled) {
const WebInputEvent* event = CurrentInputEvent::Get();
if (!event)
return kNavigationPolicyCurrentTab;
int16_t button = 0;
if (event->GetType() == WebInputEvent::Type::kMouseUp) {
const WebMouseEvent* mouse_event = static_cast<const WebMouseEvent*>(event);
switch (mouse_event->button) {
case WebMouseEvent::Button::kLeft:
button = 0;
break;
case WebMouseEvent::Button::kMiddle:
button = 1;
break;
case WebMouseEvent::Button::kRight:
button = 2;
break;
default:
return kNavigationPolicyCurrentTab;
}
} else if ((WebInputEvent::IsKeyboardEventType(event->GetType()) &&
static_cast<const WebKeyboardEvent*>(event)->windows_key_code ==
VKEY_RETURN) ||
WebInputEvent::IsGestureEventType(event->GetType())) {
// Keyboard and gesture events can simulate mouse events.
button = 0;
} else {
return kNavigationPolicyCurrentTab;
}
return NavigationPolicyFromEventModifiers(
button, event->GetModifiers() & WebInputEvent::kControlKey,
event->GetModifiers() & WebInputEvent::kShiftKey,
event->GetModifiers() & WebInputEvent::kAltKey,
event->GetModifiers() & WebInputEvent::kMetaKey, is_link_preview_enabled);
}
} // namespace
NavigationPolicy NavigationPolicyFromEvent(const Event* event) {
// TODO(b:298160400): Add a setting to disable Link Preview.
bool is_link_preview_enabled = IsLinkPreviewTriggerTypeEnabled(
features::LinkPreviewTriggerType::kAltClick);
NavigationPolicy event_policy =
NavigationPolicyFromEventInternal(event, is_link_preview_enabled);
NavigationPolicy input_policy =
NavigationPolicyFromCurrentEvent(is_link_preview_enabled);
if (event_policy == kNavigationPolicyDownload &&
input_policy != kNavigationPolicyDownload) {
// No downloads from synthesized events without user intention.
return kNavigationPolicyCurrentTab;
}
if (event_policy == kNavigationPolicyLinkPreview &&
input_policy != kNavigationPolicyLinkPreview) {
// No Link Preview from synthesized events without user intention.
return kNavigationPolicyCurrentTab;
}
if (event_policy == kNavigationPolicyNewBackgroundTab &&
input_policy != kNavigationPolicyNewBackgroundTab &&
!UIEventWithKeyState::NewTabModifierSetFromIsolatedWorld()) {
// No "tab-unders" from synthesized events without user intention.
// Events originating from an isolated world are exempt.
return kNavigationPolicyNewForegroundTab;
}
return event_policy;
}
NavigationPolicy NavigationPolicyForCreateWindow(
const WebWindowFeatures& features) {
// If our default configuration was modified by a script or wasn't
// created by a user gesture, then show as a popup. Else, let this
// new window be opened as a toplevel window.
bool as_popup = features.is_popup || !features.resizable;
NavigationPolicy app_policy =
as_popup ? kNavigationPolicyNewPopup : kNavigationPolicyNewForegroundTab;
NavigationPolicy user_policy =
NavigationPolicyFromCurrentEvent(/*is_link_preview_enabled=*/false);
if (user_policy == kNavigationPolicyNewWindow &&
app_policy == kNavigationPolicyNewPopup) {
// User and app agree that we want a new window; let the app override the
// decorations.
return app_policy;
}
if (user_policy == kNavigationPolicyCurrentTab) {
// User doesn't want a specific policy, use app policy instead.
return app_policy;
}
if (user_policy == kNavigationPolicyDownload) {
// When the input event suggests a download, but the navigation was
// initiated by script, we should not override it.
return app_policy;
}
return user_policy;
}
STATIC_ASSERT_ENUM(kWebNavigationPolicyDownload, kNavigationPolicyDownload);
STATIC_ASSERT_ENUM(kWebNavigationPolicyCurrentTab, kNavigationPolicyCurrentTab);
STATIC_ASSERT_ENUM(kWebNavigationPolicyNewBackgroundTab,
kNavigationPolicyNewBackgroundTab);
STATIC_ASSERT_ENUM(kWebNavigationPolicyNewForegroundTab,
kNavigationPolicyNewForegroundTab);
STATIC_ASSERT_ENUM(kWebNavigationPolicyNewWindow, kNavigationPolicyNewWindow);
STATIC_ASSERT_ENUM(kWebNavigationPolicyNewPopup, kNavigationPolicyNewPopup);
STATIC_ASSERT_ENUM(kWebNavigationPolicyPictureInPicture,
kNavigationPolicyPictureInPicture);
} // namespace blink
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