1// Copyright 2014 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_COMMON_FEATURES_SIMPLE_FEATURE_FILTER_H_
6#define EXTENSIONS_COMMON_FEATURES_SIMPLE_FEATURE_FILTER_H_
7
8#include <string>
9
10#include "extensions/common/features/feature.h"
11#include "extensions/common/manifest.h"
12
13class GURL;
14
15namespace base {
16class DictionaryValue;
17}
18
19namespace extensions {
20
21class SimpleFeature;
22
23// A SimpleFeatureFilter can be attached to SimpleFeature objects to provide
24// additional parsing and availability filtering behavior.
25class SimpleFeatureFilter {
26 public:
27  explicit SimpleFeatureFilter(SimpleFeature* feature);
28  virtual ~SimpleFeatureFilter();
29
30  SimpleFeature* feature() const { return feature_; }
31
32  // Parses any additional feature data that may be used by this filter.
33  // Returns an error string on failure or the empty string on success.
34  // The default implementation simply returns the empty string.
35  virtual std::string Parse(const base::DictionaryValue* value);
36
37  // Indicates whether or not the owning feature is available within a given
38  // extensions context. The default implementation only affirms availability.
39  virtual Feature::Availability IsAvailableToContext(
40      const Extension* extension,
41      Feature::Context context,
42      const GURL& url,
43      Feature::Platform platform) const;
44
45  // Indicates whether or not the owning feature is available to a given
46  // extension manifest. The default implementation only affirms availability.
47  virtual Feature::Availability IsAvailableToManifest(
48      const std::string& extension_id,
49      Manifest::Type type,
50      Manifest::Location location,
51      int manifest_version,
52      Feature::Platform platform) const;
53
54 private:
55  // The feature which owns this filter.
56  SimpleFeature* feature_;
57
58  DISALLOW_COPY_AND_ASSIGN(SimpleFeatureFilter);
59};
60
61}  // namespace extensions
62
63#endif  // EXTENSIONS_COMMON_FEATURES_SIMPLE_FEATURE_FILTER_H_
64