More fine-grained pruning in safe browsing incident reporting service.

chrome/browser/safe_browsing/tracked_preference_incident_handlers.cc

+// 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.
+
+#include "chrome/browser/safe_browsing/tracked_preference_incident_handlers.h"
+
+#include "base/logging.h"
+#include "chrome/browser/safe_browsing/incident_handler_util.h"
+#include "chrome/common/safe_browsing/csd.pb.h"
+
+namespace safe_browsing {
+
+std::string GetTrackedPreferenceIncidentKey(
+    const ClientIncidentReport_IncidentData& incident_data) {
+  DCHECK(incident_data.has_tracked_preference());
+  DCHECK(incident_data.tracked_preference().has_path());
+  return incident_data.tracked_preference().path();
+}
+
+uint32_t GetTrackedPreferenceIncidentDigest(
+    const ClientIncidentReport_IncidentData& incident_data) {
+  DCHECK(incident_data.has_tracked_preference());
+
+  // Make a canonical representation of the incident's payload over which a hash
+  // digest is computed.
+  const ClientIncidentReport_IncidentData_TrackedPreferenceIncident& input =
+      incident_data.tracked_preference();
+  ClientIncidentReport_IncidentData_TrackedPreferenceIncident incident;
+
+  if (input.has_path() && !input.path().empty())
+    incident.set_path(input.path());
+  if (input.has_atomic_value() && !input.atomic_value().empty()) {
+    incident.set_atomic_value(input.atomic_value());
+  } else {
+    for (int i = 0; i < input.split_key_size(); ++i) {
+      if (!input.split_key(i).empty())
+        incident.add_split_key(input.split_key(i));
+    }
+  }
+  if (input.has_value_state())
+    incident.set_value_state(input.value_state());
+
+  return HashMessage(incident);
+}
+
+}  // namespace safe_browsing