chrome/browser/extensions/chrome_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/chrome_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 ChromeRequirementsChecker::ChromeRequirementsChecker()
  24     : pending_requirement_checks_(0), weak_ptr_factory_(this) {
  25 }
  26
  27 ChromeRequirementsChecker::~ChromeRequirementsChecker() {
  28 }
  29
  30 void ChromeRequirementsChecker::Check(
  31     const scoped_refptr<const Extension>& extension,
  32     const RequirementsCheckedCallback& callback) {
  33   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  34
  35   callback_ = callback;
  36   const RequirementsInfo& requirements =
  37       RequirementsInfo::GetRequirements(extension.get());
  38
  39   if (requirements.npapi) {
  40 #if defined(OS_POSIX) && !defined(OS_MACOSX)
  41     errors_.push_back(
  42         l10n_util::GetStringUTF8(IDS_EXTENSION_NPAPI_NOT_SUPPORTED));
  43 #endif
  44 #if defined(OS_WIN)
  45     if (base::win::IsMetroProcess()) {
  46       errors_.push_back(
  47           l10n_util::GetStringUTF8(IDS_EXTENSION_NPAPI_NOT_SUPPORTED));
  48     }
  49 #endif
  50   }
  51
  52   if (requirements.window_shape) {
  53 #if !defined(USE_AURA)
  54     errors_.push_back(
  55         l10n_util::GetStringUTF8(IDS_EXTENSION_WINDOW_SHAPE_NOT_SUPPORTED));
  56 #endif
  57   }
  58
  59   if (requirements.webgl) {
  60     ++pending_requirement_checks_;
  61     webgl_checker_ = new GPUFeatureChecker(
  62         gpu::GPU_FEATURE_TYPE_WEBGL,
  63         base::Bind(&ChromeRequirementsChecker::SetWebGLAvailability,
  64                    weak_ptr_factory_.GetWeakPtr()));
  65   }
  66
  67   if (pending_requirement_checks_ == 0) {
  68     content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
  69                                      base::Bind(callback_, errors_));
  70     // Reset the callback so any ref-counted bound parameters will get released.
  71     callback_.Reset();
  72     return;
  73   }
  74   // Running the GPU checkers down here removes any race condition that arises
  75   // from the use of pending_requirement_checks_.
  76   if (webgl_checker_.get())
  77     webgl_checker_->CheckGPUFeatureAvailability();
  78 }
  79
  80 void ChromeRequirementsChecker::SetWebGLAvailability(bool available) {
  81   if (!available) {
  82     errors_.push_back(
  83         l10n_util::GetStringUTF8(IDS_EXTENSION_WEBGL_NOT_SUPPORTED));
  84   }
  85   MaybeRunCallback();
  86 }
  87
  88 void ChromeRequirementsChecker::MaybeRunCallback() {
  89   if (--pending_requirement_checks_ == 0) {
  90     content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
  91                                      base::Bind(callback_, errors_));
  92     // Reset the callback so any ref-counted bound parameters will get released.
  93     callback_.Reset();
  94     errors_.clear();
  95   }
  96 }
  97
  98 }  // namespace extensions