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1 // Copyright 2017 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 #ifndef EXTENSIONS_BROWSER_PRELOAD_CHECK_H_ | |
6 #define EXTENSIONS_BROWSER_PRELOAD_CHECK_H_ | |
7 | |
8 #include <memory> | |
9 #include <unordered_set> | |
10 #include <utility> | |
11 | |
12 #include "base/callback.h" | |
13 #include "base/macros.h" | |
14 #include "base/memory/ref_counted.h" | |
15 #include "base/strings/string16.h" | |
16 #include "extensions/common/extension.h" | |
17 | |
18 namespace extensions { | |
19 | |
20 // Encapsulates a possibly asynchronous operation to verify whether a | |
21 // precondition holds for loading the given extension. | |
22 class PreloadCheck { | |
23 public: | |
24 // These enumerators should only be referred to by name, so it is safe to | |
25 // insert or remove values as necessary. | |
26 enum Error { | |
27 NONE, | |
28 BLACKLISTED_ID, | |
29 BLACKLISTED_UNKNOWN, | |
30 DISALLOWED_BY_POLICY, | |
31 }; | |
32 | |
33 // TODO(michaelpg): Remove std::hash<int> template argument once std::hash | |
34 // directly supports enums. | |
35 // See http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2148 | |
36 using Errors = std::unordered_set<Error, std::hash<int>>; | |
Devlin
2017/03/14 01:44:34
Any reason to use unordered_set here? Seems like
michaelpg
2017/03/14 21:58:30
/shrug/ std::set sgtm
| |
37 using ResultCallback = base::OnceCallback<void(Errors)>; | |
38 | |
39 explicit PreloadCheck(scoped_refptr<const Extension> extension); | |
40 virtual ~PreloadCheck(); | |
41 | |
42 // This function must be called on the UI thread. The callback also occurs on | |
43 // the UI thread. | |
44 virtual void Start(ResultCallback callback) = 0; | |
45 | |
46 // Subclasses may provide an error message. | |
47 virtual base::string16 GetErrorMessage() const; | |
48 | |
49 const Extension* extension() { return extension_.get(); } | |
50 | |
51 private: | |
52 // The extension to check. | |
53 scoped_refptr<const Extension> extension_; | |
54 | |
55 DISALLOW_COPY_AND_ASSIGN(PreloadCheck); | |
56 }; | |
57 | |
58 } // namespace extensions | |
59 | |
60 #endif // EXTENSIONS_BROWSER_PRELOAD_CHECK_H_ | |
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