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