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