[Easy Unlock] Port RemoteStatusUpdate class to native code.

components/proximity_auth/remote_status_update.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 "components/proximity_auth/remote_status_update.h"
+
+#include "base/json/json_reader.h"
+#include "base/logging.h"
+#include "base/values.h"
+
+namespace {
+
+// The value of the 'type' status update field.
+const char kStatusUpdateType[] = "status_update";
+
+// Keys in the serialized RemoteStatusUpdate JSON object.
+const char kType[] = "type";
+const char kUserPresence[] = "user_presence";
+const char kSecureScreenLock[] = "secure_screen_lock";
+const char kTrustAgent[] = "trust_agent";
+
+// Values in the serialized RemoteStatusUpdate JSON object.
+const char kUserPresent[] = "present";
+const char kUserAbsent[] = "absent";
+const char kUserPresenceUnknown[] = "unknown";
+
+const char kSecureScreenLockEnabled[] = "enabled";
+const char kSecureScreenLockDisabled[] = "disabled";
+const char kSecureScreenLockStateUnknown[] = "unknown";
+
+const char kTrustAgentEnabled[] = "enabled";
+const char kTrustAgentDisabled[] = "disabled";
+const char kTrustAgentUnsupported[] = "unsupported";
+
+}  // namespace
+
+namespace proximity_auth {
+
+// static
+scoped_ptr<RemoteStatusUpdate> RemoteStatusUpdate::FromJson(
+    const std::string& json) {
+  scoped_ptr<base::Value> update_value(base::JSONReader::Read(json));
+  if (!update_value || !update_value->IsType(base::Value::TYPE_DICTIONARY)) {
+    VLOG(1) << "Unable to parse remote status update: invalid JSON object.";
+    return scoped_ptr<RemoteStatusUpdate>();
+  }
+
+  base::DictionaryValue* update;
+  bool success = update_value->GetAsDictionary(&update);
+  DCHECK(success);
+
+  std::string type;
+  if (!update->GetString(kType, &type) || type != kStatusUpdateType) {
+    VLOG(1) << "Unable to parse remote status update: unexpected type. "
+            << "Expected: '" << kStatusUpdateType << "', "
+            << "Saw: '" << type << "'.";
+    return scoped_ptr<RemoteStatusUpdate>();
+  }
+
+  std::string user_presence, secure_screen_lock_state, trust_agent_state;
+  if (!update->GetString(kUserPresence, &user_presence) ||
+      !update->GetString(kSecureScreenLock, &secure_screen_lock_state) ||
+      !update->GetString(kTrustAgent, &trust_agent_state)) {
+    VLOG(1) << "Unable to parse remote status update: missing data value.";

[Tim Song, 2014/10/09 19:07:30]

Also log the json string.

[Ilya Sherman, 2014/10/09 22:52:33]

Done.

+    return scoped_ptr<RemoteStatusUpdate>();
+  }
+
+  scoped_ptr<RemoteStatusUpdate> parsed_update(new RemoteStatusUpdate);
+  if (user_presence == kUserPresent) {
+    parsed_update->user_presence = USER_PRESENT;
+  } else if (user_presence == kUserAbsent) {
+    parsed_update->user_presence = USER_ABSENT;
+  } else if (user_presence == kUserPresenceUnknown) {
+    parsed_update->user_presence = USER_PRESENCE_UNKNOWN;
+  } else {
+    VLOG(1) << "Unable to parse remote status update: invalid user presence: '"
+            << user_presence << "'.";
+    return scoped_ptr<RemoteStatusUpdate>();
+  }
+
+  if (secure_screen_lock_state == kSecureScreenLockEnabled) {
+    parsed_update->secure_screen_lock_state = SECURE_SCREEN_LOCK_ENABLED;
+  } else if (secure_screen_lock_state == kSecureScreenLockDisabled) {
+    parsed_update->secure_screen_lock_state = SECURE_SCREEN_LOCK_DISABLED;
+  } else if (secure_screen_lock_state == kSecureScreenLockStateUnknown) {
+    parsed_update->secure_screen_lock_state = SECURE_SCREEN_LOCK_STATE_UNKNOWN;
+  } else {
+    VLOG(1) << "Unable to parse remote status update: invalid secure screen "
+            << "lock state: '" << secure_screen_lock_state << "'.";
+    return scoped_ptr<RemoteStatusUpdate>();
+  }
+
+  if (trust_agent_state == kTrustAgentEnabled) {
+    parsed_update->trust_agent_state = TRUST_AGENT_ENABLED;
+  } else if (trust_agent_state == kTrustAgentDisabled) {
+    parsed_update->trust_agent_state = TRUST_AGENT_DISABLED;
+  } else if (trust_agent_state == kTrustAgentUnsupported) {
+    parsed_update->trust_agent_state = TRUST_AGENT_UNSUPPORTED;
+  } else {
+    VLOG(1) << "Unable to parse remote status update: invalid trust agent "
+            << "state: '" << trust_agent_state << "'.";
+    return scoped_ptr<RemoteStatusUpdate>();
+  }
+
+  return parsed_update.Pass();
+}
+
+}  // namespace proximity_auth