// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_EXTENSIONS_REQUIREMENTS_CHECKER_H_
#define CHROME_BROWSER_EXTENSIONS_REQUIREMENTS_CHECKER_H_
#include <vector>
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/extensions/extension_service.h"
class GPUFeatureChecker;
namespace extensions {
class Extension;
// Validates the 'requirements' extension manifest field. This is an
// asynchronous process that involves several threads, but the public interface
// of this class (including constructor and destructor) must only be used on
// the UI thread.
class RequirementsChecker : public base::SupportsWeakPtr<RequirementsChecker> {
public:
RequirementsChecker();
~RequirementsChecker();
// The vector passed to the callback are any localized errors describing
// requirement violations. If this vector is non-empty, requirements checking
// failed. This should only be called once. |callback| will always be invoked
// asynchronously on the UI thread. |callback| will only be called once, and
// will be reset after called.
void Check(scoped_refptr<const Extension> extension,
base::Callback<void(std::vector<std::string> requirement)> callback);
private:
// Callbacks for the GPUFeatureChecker.
void SetWebGLAvailability(bool available);
void SetCSS3DAvailability(bool available);
void MaybeRunCallback();
std::vector<std::string> errors_;
// Every requirement that needs to be resolved asynchronously will add to
// this counter. When the counter is depleted, the callback will be run.
int pending_requirement_checks_;
scoped_refptr<GPUFeatureChecker> webgl_checker_;
scoped_refptr<GPUFeatureChecker> css3d_checker_;
base::Callback<void(std::vector<std::string> requirement_errorss)> callback_;
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_REQUIREMENTS_CHECKER_H_