Define PushMessagingApplicationId and replace ad-hoc code.

chrome/browser/services/gcm/push_messaging_application_id.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/services/gcm/push_messaging_application_id.h"
+
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+
+namespace {
+const char kSeparator = '#';  // Ok as only the origin of the url is used.
+}
+
+namespace gcm {
+
+const char kPushMessagingApplicationIdPrefix[] = "push";
+
+// static
+PushMessagingApplicationId PushMessagingApplicationId::Parse(
+    const std::string& id) {
+  std::vector<std::string> parts;
+  base::SplitString(id, kSeparator, &parts);
+
+  if (parts.size() != 3 || parts[0] != kPushMessagingApplicationIdPrefix)
+    return PushMessagingApplicationId();
+
+  GURL origin = GURL(parts[1]);
+  if (!origin.is_valid() || origin.GetOrigin() != origin)
+    return PushMessagingApplicationId();
+
+  int64 service_worker_registration_id;
+  if (!base::StringToInt64(parts[2], &service_worker_registration_id))
+    return PushMessagingApplicationId();
+
+  return PushMessagingApplicationId(origin, service_worker_registration_id);
+}
+
+bool PushMessagingApplicationId::IsValid() {
+  return origin.is_valid() && origin.GetOrigin() == origin &&
+         service_worker_registration_id >= 0;
+}
+
+std::string PushMessagingApplicationId::ToString() const {
+  return (std::string(kPushMessagingApplicationIdPrefix) + kSeparator +
+          origin.spec() + kSeparator +
+          base::Int64ToString(service_worker_registration_id));
+}
+
+}  // namespace gcm