content/common/input/input_event_stream_validator.cc

   1 // Copyright 2014 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 "content/common/input/input_event_stream_validator.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/logging.h"
   9 #include "content/common/input/web_input_event_traits.h"
  10 #include "content/public/common/content_switches.h"
  11 #include "third_party/WebKit/public/web/WebInputEvent.h"
  12
  13 using blink::WebInputEvent;
  14 using blink::WebGestureEvent;
  15 using blink::WebTouchEvent;
  16
  17 namespace content {
  18
  19 InputEventStreamValidator::InputEventStreamValidator()
  20     : enabled_(base::CommandLine::ForCurrentProcess()->HasSwitch(
  21           switches::kValidateInputEventStream)) {
  22 }
  23
  24 InputEventStreamValidator::~InputEventStreamValidator() {
  25 }
  26
  27 void InputEventStreamValidator::Validate(const WebInputEvent& event) {
  28   if (!enabled_)
  29     return;
  30
  31   DCHECK(ValidateImpl(event, &error_msg_))
  32       << error_msg_
  33       << "\nInvalid Event: " << WebInputEventTraits::ToString(event);
  34 }
  35
  36 bool InputEventStreamValidator::ValidateImpl(const blink::WebInputEvent& event,
  37                                              std::string* error_msg) {
  38   DCHECK(error_msg);
  39   if (WebInputEvent::isGestureEventType(event.type)) {
  40     const WebGestureEvent& gesture = static_cast<const WebGestureEvent&>(event);
  41     // TODO(jdduke): Validate touchpad gesture streams.
  42     if (gesture.sourceDevice == blink::WebGestureDeviceTouchscreen)
  43       return gesture_validator_.Validate(gesture, error_msg);
  44   } else if (WebInputEvent::isTouchEventType(event.type)) {
  45     const WebTouchEvent& touch = static_cast<const WebTouchEvent&>(event);
  46     return touch_validator_.Validate(touch, error_msg);
  47   }
  48   return true;
  49 }
  50
  51 }  // namespace content