src/chrome/browser/extensions/requirements_checker.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 "chrome/browser/extensions/requirements_checker.h"
   6
   7 #include "base/bind.h"
   8 #include "chrome/browser/gpu/gpu_feature_checker.h"
   9 #include "chrome/grit/generated_resources.h"
  10 #include "content/public/browser/browser_thread.h"
  11 #include "extensions/common/extension.h"
  12 #include "extensions/common/manifest.h"
  13 #include "extensions/common/manifest_handlers/requirements_info.h"
  14 #include "gpu/config/gpu_feature_type.h"
  15 #include "ui/base/l10n/l10n_util.h"
  16
  17 #if defined(OS_WIN)
  18 #include "base/win/metro.h"
  19 #endif
  20
  21 namespace extensions {
  22
  23 RequirementsChecker::RequirementsChecker()
  24     : pending_requirement_checks_(0) {
  25 }
  26
  27 RequirementsChecker::~RequirementsChecker() {
  28 }
  29
  30 void RequirementsChecker::Check(scoped_refptr<const Extension> extension,
  31     base::Callback<void(std::vector<std::string> errors)> callback) {
  32   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  33
  34   callback_ = callback;
  35   const RequirementsInfo& requirements =
  36       RequirementsInfo::GetRequirements(extension.get());
  37
  38   if (requirements.npapi) {
  39 #if defined(OS_POSIX) && !defined(OS_MACOSX)
  40     errors_.push_back(
  41         l10n_util::GetStringUTF8(IDS_EXTENSION_NPAPI_NOT_SUPPORTED));
  42 #endif
  43 #if defined(OS_WIN)
  44     if (base::win::IsMetroProcess()) {
  45       errors_.push_back(
  46           l10n_util::GetStringUTF8(IDS_EXTENSION_NPAPI_NOT_SUPPORTED));
  47     }
  48 #endif
  49   }
  50
  51   if (requirements.window_shape) {
  52 #if !defined(USE_AURA)
  53     errors_.push_back(
  54         l10n_util::GetStringUTF8(IDS_EXTENSION_WINDOW_SHAPE_NOT_SUPPORTED));
  55 #endif
  56   }
  57
  58   if (requirements.webgl) {
  59     ++pending_requirement_checks_;
  60     webgl_checker_ = new GPUFeatureChecker(
  61       gpu::GPU_FEATURE_TYPE_WEBGL,
  62       base::Bind(&RequirementsChecker::SetWebGLAvailability,
  63                  AsWeakPtr()));
  64   }
  65
  66   if (pending_requirement_checks_ == 0) {
  67     content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
  68                                      base::Bind(callback_, errors_));
  69     // Reset the callback so any ref-counted bound parameters will get released.
  70     callback_.Reset();
  71     return;
  72   }
  73   // Running the GPU checkers down here removes any race condition that arises
  74   // from the use of pending_requirement_checks_.
  75   if (webgl_checker_.get())
  76     webgl_checker_->CheckGPUFeatureAvailability();
  77 }
  78
  79 void RequirementsChecker::SetWebGLAvailability(bool available) {
  80   if (!available) {
  81     errors_.push_back(
  82         l10n_util::GetStringUTF8(IDS_EXTENSION_WEBGL_NOT_SUPPORTED));
  83   }
  84   MaybeRunCallback();
  85 }
  86
  87 void RequirementsChecker::MaybeRunCallback() {
  88   if (--pending_requirement_checks_ == 0) {
  89     content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
  90                                      base::Bind(callback_, errors_));
  91     // Reset the callback so any ref-counted bound parameters will get released.
  92     callback_.Reset();
  93     errors_.clear();
  94   }
  95 }
  96
  97 }  // namespace extensions