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// Copyright 2017 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 EXTENSIONS_BROWSER_PRELOAD_CHECK_H_
#define EXTENSIONS_BROWSER_PRELOAD_CHECK_H_
#include <set>
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
namespace extensions {
class Extension;
// Encapsulates a possibly asynchronous operation to verify whether a
// precondition holds for loading the given extension.
class PreloadCheck {
public:
// These enumerators should only be referred to by name, so it is safe to
// insert or remove values as necessary.
enum Error {
NONE,
BLOCKLISTED_ID,
BLOCKLISTED_UNKNOWN,
DISALLOWED_BY_POLICY,
WEBGL_NOT_SUPPORTED,
WINDOW_SHAPE_NOT_SUPPORTED,
};
using Errors = std::set<Error>;
using ResultCallback = base::OnceCallback<void(const Errors&)>;
explicit PreloadCheck(scoped_refptr<const Extension> extension);
virtual ~PreloadCheck();
// This function must be called on the UI thread. The callback also occurs on
// the UI thread.
virtual void Start(ResultCallback callback) = 0;
// Subclasses may provide an error message.
virtual std::u16string GetErrorMessage() const;
const Extension* extension() { return extension_.get(); }
private:
// The extension to check.
scoped_refptr<const Extension> extension_;
DISALLOW_COPY_AND_ASSIGN(PreloadCheck);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_PRELOAD_CHECK_H_
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