ppapi/shared_impl/ppb_instance_shared.cc

   1 // Copyright (c) 2012 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 "ppapi/shared_impl/ppb_instance_shared.h"
   6
   7 #include <string>
   8
   9 #include "base/debug/trace_event.h"
  10 #include "base/threading/platform_thread.h"
  11 #include "ppapi/c/pp_errors.h"
  12 #include "ppapi/c/ppb_input_event.h"
  13 #include "ppapi/shared_impl/ppapi_globals.h"
  14 #include "ppapi/shared_impl/ppb_image_data_shared.h"
  15 #include "ppapi/shared_impl/var.h"
  16 #include "ppapi/thunk/enter.h"
  17 #include "ppapi/thunk/ppb_image_data_api.h"
  18
  19 namespace ppapi {
  20
  21 // static
  22 const int PPB_Instance_Shared::kExtraCharsForTextInput = 100;
  23
  24 PPB_Instance_Shared::~PPB_Instance_Shared() {
  25 }
  26
  27 void PPB_Instance_Shared::Log(PP_Instance instance,
  28                               PP_LogLevel level,
  29                               PP_Var value) {
  30   LogWithSource(instance, level, PP_MakeUndefined(), value);
  31 }
  32
  33 void PPB_Instance_Shared::LogWithSource(PP_Instance instance,
  34                                         PP_LogLevel level,
  35                                         PP_Var source,
  36                                         PP_Var value) {
  37   // The source defaults to empty if it's not a string. The PpapiGlobals
  38   // implementation will convert the empty string to the module name if
  39   // possible.
  40   std::string source_str;
  41   if (source.type == PP_VARTYPE_STRING)
  42     source_str = Var::PPVarToLogString(source);
  43   std::string value_str = Var::PPVarToLogString(value);
  44   PpapiGlobals::Get()->LogWithSource(instance, level, source_str, value_str);
  45 }
  46
  47 int32_t PPB_Instance_Shared::ValidateRequestInputEvents(
  48     bool is_filtering,
  49     uint32_t event_classes) {
  50   // See if any bits are set we don't know about.
  51   if (event_classes &
  52       ~static_cast<uint32_t>(PP_INPUTEVENT_CLASS_MOUSE |
  53                              PP_INPUTEVENT_CLASS_KEYBOARD |
  54                              PP_INPUTEVENT_CLASS_WHEEL |
  55                              PP_INPUTEVENT_CLASS_TOUCH |
  56                              PP_INPUTEVENT_CLASS_IME))
  57     return PP_ERROR_NOTSUPPORTED;
  58
  59   // Everything else is valid.
  60   return PP_OK;
  61 }
  62
  63 bool PPB_Instance_Shared::ValidateSetCursorParams(PP_MouseCursor_Type type,
  64                                                   PP_Resource image,
  65                                                   const PP_Point* hot_spot) {
  66   if (static_cast<int>(type) < static_cast<int>(PP_MOUSECURSOR_TYPE_CUSTOM) ||
  67       static_cast<int>(type) > static_cast<int>(PP_MOUSECURSOR_TYPE_GRABBING))
  68     return false;  // Cursor type out of range.
  69   if (type != PP_MOUSECURSOR_TYPE_CUSTOM) {
  70     // The image must not be specified if the type isn't custom. However, we
  71     // don't require that the hot spot be null since the C++ wrappers and proxy
  72     // pass the point by reference and it will normally be specified.
  73     return image == 0;
  74   }
  75
  76   if (!hot_spot)
  77     return false;  // Hot spot must be specified for custom cursor.
  78
  79   thunk::EnterResourceNoLock<thunk::PPB_ImageData_API> enter(image, true);
  80   if (enter.failed())
  81     return false;  // Invalid image resource.
  82
  83   // Validate the image size. A giant cursor can arbitrarily overwrite parts
  84   // of the screen resulting in potential spoofing attacks. So we force the
  85   // cursor to be a reasonably-sized image.
  86   PP_ImageDataDesc desc;
  87   if (!PP_ToBool(enter.object()->Describe(&desc)))
  88     return false;
  89   if (desc.size.width > 32 || desc.size.height > 32)
  90     return false;
  91
  92   // Validate image format.
  93   if (desc.format != PPB_ImageData_Shared::GetNativeImageDataFormat())
  94     return false;
  95
  96   // Validate the hot spot location.
  97   if (hot_spot->x < 0 || hot_spot->x >= desc.size.width ||
  98       hot_spot->y < 0 || hot_spot->y >= desc.size.height)
  99     return false;
 100   return true;
 101 }
 102
 103 }  // namespace ppapi