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// Copyright 2014 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 CHROME_BROWSER_METRICS_EXTENSION_METRICS_H_
#define CHROME_BROWSER_METRICS_EXTENSION_METRICS_H_
#include <string>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
class Profile;
namespace extensions {
class ExtensionSet;
}
namespace metrics {
class SystemProfileProto;
}
// HashedExtensionMetrics groups various constants and functions used for
// reporting extension IDs with UMA reports (after hashing the extension IDs
// for privacy).
class HashedExtensionMetrics {
public:
explicit HashedExtensionMetrics(uint64 client_id);
virtual ~HashedExtensionMetrics();
// Writes the hashed list of installed extensions into the specified
// SystemProfileProto object.
void WriteExtensionList(metrics::SystemProfileProto* system_profile);
protected:
// Retrieves the set of extensions installed in the current profile. The
// default implementation should be fine, but this can be overridden for
// testing.
//
// TODO(mvrable): If metrics are ever converted to being per-profile, then
// this should be updated to return extensions installed in a specified
// profile.
virtual scoped_ptr<extensions::ExtensionSet> GetInstalledExtensions();
// Hashes the extension extension ID using the provided client key (which
// must be less than kExtensionListClientKeys) and to produce an output value
// between 0 and kExtensionListBuckets-1.
static int HashExtension(const std::string& extension_id, uint32 client_key);
private:
// Returns the profile for which extensions will be gathered. Once a
// suitable profile has been found, future calls will continue to return the
// same value so that reported extensions are consistent.
Profile* GetMetricsProfile();
// The key used when hashing extension identifiers, derived from client_id.
const int client_key_;
// The profile for which extensions are gathered. Once a profile is found
// its value is cached here so that GetMetricsProfile() can return a
// consistent value.
Profile* cached_profile_;
DISALLOW_COPY_AND_ASSIGN(HashedExtensionMetrics);
};
#endif // CHROME_BROWSER_METRICS_EXTENSION_METRICS_H_
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