[GCM] Adding AccountInfo structure to persist accounts mapped to GCM

google_apis/gcm/engine/account_info.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 "google_apis/gcm/engine/account_info.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+
+namespace gcm {
+
+namespace {
+
+const char kSeparator[] = "&";
+uint32 kEmailIndex = 0;
+uint32 kMessageTypeIndex = 1;
+uint32 kMessageIdIndex = 2;
+uint32 kMessageTimestampIndex = 3;
+uint32 kSizeWithNoMessage = kMessageTypeIndex + 1;
+uint32 kSizeWithMessage = kMessageTimestampIndex + 1;
+
+std::string MessageTypeToString(AccountInfo::MessageType type) {
+  switch (type) {
+    case AccountInfo::MSG_NONE:
+      return "none";
+    case AccountInfo::MSG_ADD:
+      return "add";
+    case AccountInfo::MSG_REMOVE:
+      return "remove";
+    default:
+      NOTREACHED();
+  }
+  return "";
+}
+
+AccountInfo::MessageType StringToMessageType(const std::string& type) {
+  if (type.compare("add") == 0)
+    return AccountInfo::MSG_ADD;
+  if (type.compare("remove") == 0)
+    return AccountInfo::MSG_REMOVE;
+  return AccountInfo::MSG_NONE;
+}
+
+}  // namespace
+
+AccountInfo::AccountInfo() {
+}
+
+AccountInfo::~AccountInfo() {
+}
+
+std::string AccountInfo::SerializeAsString() const {
+  std::string value;
+  value.append(email);
+  value.append(kSeparator);
+  value.append(MessageTypeToString(last_message_type));
+  if (last_message_type != MSG_NONE) {
+    value.append(kSeparator);
+    value.append(last_message_id);
+    value.append(kSeparator);
+    value.append(base::Int64ToString(last_message_timestamp.ToInternalValue()));
+  }
+
+  return value;
+}
+
+bool AccountInfo::ParseFromString(const std::string& value) {
+  std::vector<std::string> values;
+  Tokenize(value, kSeparator, &values);
+  if (values.size() != kSizeWithNoMessage &&
+      values.size() != kSizeWithMessage) {
+    return false;
+  }
+
+  if (values[kEmailIndex].empty() ||
+      values[kMessageTypeIndex].empty()) {
+    return false;
+  }
+
+  if (values.size() == kSizeWithMessage &&
+      (values[kMessageIdIndex].empty() ||
+       values[kMessageTimestampIndex].empty())) {
+    return false;
+  }
+
+  if (values.size() == kSizeWithMessage) {
+    int64 timestamp = 0LL;
+    if (!base::StringToInt64(values[kMessageTimestampIndex], &timestamp))
+      return false;
+
+    MessageType message_type = StringToMessageType(values[kMessageTypeIndex]);
+    if (message_type == MSG_NONE)
+      return false;
+
+    last_message_type = message_type;
+    last_message_id = values[kMessageIdIndex];
+    last_message_timestamp = base::Time::FromInternalValue(timestamp);
+  } else {
+    last_message_type = MSG_NONE;
+    last_message_id.clear();
+    last_message_timestamp = base::Time();
+  }
+
+  email = values[kEmailIndex];
+
+  return true;
+}
+
+}  // namespace gcm