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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_RENDERER_FEATURE_CACHE_H_
#define EXTENSIONS_RENDERER_FEATURE_CACHE_H_
#include <map>
#include <string>
#include <utility>
#include <vector>
#include "base/macros.h"
#include "extensions/common/extension_id.h"
#include "extensions/common/features/feature.h"
#include "url/gurl.h"
namespace extensions {
class Extension;
// Caches features available to different extensions in different context types,
// and returns features available to a given context. Note: currently, this is
// only used for non-webpage contexts.
// TODO(devlin): Use it for all context types?
// Note: This could actually go in extensions/common/, if there was any need for
// it browser-side.
class FeatureCache {
public:
using FeatureNameVector = std::vector<std::string>;
FeatureCache();
~FeatureCache();
// Returns the names of features available to the given set of |context_type|,
// |extension|, and |url| in a lexicographically sorted vector.
// Note: these contexts should be valid, so WebUI contexts should have no
// extensions, extension should be non-null for extension contexts, etc.
FeatureNameVector GetAvailableFeatures(Feature::Context context_type,
const Extension* extension,
const GURL& url);
// Invalidates the cache for the specified extension.
void InvalidateExtension(const ExtensionId& extension_id);
private:
using FeatureVector = std::vector<const Feature*>;
// Note: We use a key of ExtensionId, Feature::Context to maximize cache hits.
// Unfortunately, this won't always be perfectly accurate, since some features
// may have other context-dependent restrictions (such as URLs), but caching
// by extension id + context + url would result in significantly fewer hits.
using ExtensionCacheMapKey = std::pair<ExtensionId, Feature::Context>;
using ExtensionCacheMap = std::map<ExtensionCacheMapKey, FeatureVector>;
// Cache by origin.
using WebUICacheMap = std::map<GURL, FeatureVector>;
// Returns the features available to the given context from the cache,
// creating a new entry if one doesn't exist.
const FeatureVector& GetFeaturesFromCache(Feature::Context context_type,
const Extension* extension,
const GURL& origin);
// Creates a FeatureVector to be entered into a cache for the specified
// context data.
FeatureVector CreateCacheEntry(Feature::Context context_type,
const Extension* extension,
const GURL& origin);
// The cache of extension-related contexts. These may be invalidated, since
// extension permissions change.
ExtensionCacheMap extension_cache_;
// The cache of WebUI-related features. These shouldn't need to be
// invalidated (since WebUI permissions don't change), and are cached by
// origin. These covers chrome:// and chrome-untrusted:// URLs.
WebUICacheMap webui_cache_;
DISALLOW_COPY_AND_ASSIGN(FeatureCache);
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_FEATURE_CACHE_H_
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