Send notification to users upon receiving sms messages

ash/common/system/chromeos/network/sms_observer.cc

Index: ash/common/system/chromeos/network/sms_observer.cc
diff --git a/ash/common/system/chromeos/network/sms_observer.cc b/ash/common/system/chromeos/network/sms_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b6cb0f5acb9a6a04476a31e00863cd2dd4b7c64b
--- /dev/null
+++ b/ash/common/system/chromeos/network/sms_observer.cc
@@ -0,0 +1,93 @@
+// Copyright 2017 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 "ash/common/system/chromeos/network/sms_observer.h"
+
+#include "ash/common/system/system_notifier.h"
+#include "ash/common/system/tray/tray_constants.h"
+#include "ash/resources/vector_icons/vector_icons.h"
+#include "base/memory/ptr_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chromeos/network/network_event_log.h"
+#include "chromeos/network/network_handler.h"
+#include "ui/gfx/paint_vector_icon.h"
+#include "ui/message_center/message_center.h"
+
+using chromeos::NetworkHandler;
+
+namespace ash {
+
+namespace {
+
+// Send the |message| to notification center to display to users. Note that each
+// notification will be assigned with different |message_id| as notification id.
+void ShowNotification(const base::DictionaryValue* message,
+                      const std::string& message_text,
+                      const std::string& message_number,
+                      int message_id) {
+  message_center::MessageCenter* message_center =
+      message_center::MessageCenter::Get();
+  if (!message_center)
+    return;
+
+  const char kNotificationId[] = "chrome://network/sms";
+  std::unique_ptr<message_center::Notification> notification;
+
+  notification = base::MakeUnique<message_center::Notification>(
+      message_center::NOTIFICATION_TYPE_SIMPLE,
+      kNotificationId + std::to_string(message_id),
+      base::ASCIIToUTF16(message_number), base::ASCIIToUTF16(message_text),
+      gfx::Image(gfx::CreateVectorIcon(
+          ash::kSystemMenuSmsIcon, ash::kMenuIconSize, ash::kMenuIconColor)),
+      base::string16(), GURL(),
+      message_center::NotifierId(message_center::NotifierId::APPLICATION,
+                                 ash::system_notifier::kNotifierSms),
+      message_center::RichNotificationData(), nullptr);
+  message_center->AddNotification(std::move(notification));
+}
+
+}  // namespace
+
+SmsObserver::SmsObserver() {
+  // TODO(armansito): SMS could be a special case for cellular that requires a
+  // user (perhaps the owner) to be logged in. If that is the case, then an
+  // additional check should be done before subscribing for SMS notifications.
+  if (NetworkHandler::IsInitialized())
+    NetworkHandler::Get()->network_sms_handler()->AddObserver(this);
+}
+
+SmsObserver::~SmsObserver() {
+  if (NetworkHandler::IsInitialized()) {
+    NetworkHandler::Get()->network_sms_handler()->RemoveObserver(this);
+  }
+}
+
+void SmsObserver::MessageReceived(const base::DictionaryValue& message) {
+  std::string message_text;
+  if (!message.GetStringWithoutPathExpansion(
+          chromeos::NetworkSmsHandler::kTextKey, &message_text)) {
+    NET_LOG(ERROR) << "SMS message contains no content.";
+    return;
+  }
+  // TODO(armansito): A message might be due to a special "Message Waiting"
+  // state that the message is in. Once SMS handling moves to shill, such
+  // messages should be filtered there so that this check becomes unnecessary.
+  if (message_text.empty()) {
+    NET_LOG(DEBUG) << "SMS has empty content text. Ignoring.";
+    return;
+  }
+  std::string message_number;
+  if (!message.GetStringWithoutPathExpansion(
+          chromeos::NetworkSmsHandler::kNumberKey, &message_number)) {
+    NET_LOG(DEBUG) << "SMS contains no number. Ignoring.";
+    return;
+  }
+
+  NET_LOG(DEBUG) << "Received SMS from: " << message_number
+                 << " with text: " << message_text;
+  message_id_++;
+  ShowNotification(&message, message_text, message_number, message_id_);
+}
+
+}  // namespace ash