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      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 "content/public/browser/browser_thread.h"
     10 #include "extensions/common/extension.h"
     11 #include "extensions/common/manifest.h"
     12 #include "extensions/common/manifest_handlers/requirements_info.h"
     13 #include "gpu/config/gpu_feature_type.h"
     14 #include "grit/generated_resources.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
     98