| // 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_ |