[Sync] Fix crash when converting Notification to string

Also add test.

BUG=142925

Review URL: https://chromiumcodereview.appspot.com/10831347

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152158 0039d316-1c4b-4281-b951-d872f2087c98

jingle/jingle.gyp

@@ -171,6 +171,7 @@
         'notifier/communicator/login_settings_unittest.cc',
         'notifier/communicator/single_login_attempt_unittest.cc',
         'notifier/listener/non_blocking_push_client_unittest.cc',
+        'notifier/listener/notification_defines_unittest.cc',
         'notifier/listener/push_client_unittest.cc',
         'notifier/listener/push_notifications_send_update_task_unittest.cc',
         'notifier/listener/push_notifications_subscribe_task_unittest.cc',

jingle/notifier/listener/notification_defines.cc

@@ -6,7 +6,7 @@
 
 #include <cstddef>
 
-#include "base/json/json_writer.h"
+#include "base/json/string_escape.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/values.h"
@@ -65,14 +65,12 @@ bool Notification::Equals(const Notification& other) const {
 }
 
 std::string Notification::ToString() const {
-  // Put into a DictionaryValue and convert to a string; this gives a
-  // nice hex-encoding of |data|, which may be a binary string.
-  DictionaryValue dict;
-  dict.SetString("channel", channel);
-  dict.SetString("data", data);
-  std::string str;
-  base::JSONWriter::Write(&dict, &str);
-  return str;
+  // |channel| or |data| could hold binary data, so use GetDoubleQuotedJson()
+  // to escape them.
+  const std::string& printable_channel = base::GetDoubleQuotedJson(channel);
+  const std::string& printable_data = base::GetDoubleQuotedJson(data);
+  return
+      "{ channel: " + printable_channel + ", data: " + printable_data + " }";
 }
 
 }  // namespace notifier

jingle/notifier/listener/notification_defines_unittest.cc

@@ -0,0 +1,27 @@
+// Copyright (c) 2012 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 <string>
+
+#include "base/string_util.h"
+#include "jingle/notifier/listener/notification_defines.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace notifier {
+namespace {
+
+class NotificationTest : public testing::Test {};
+
+// Create a notification with binary data in the data field.
+// Converting it to string shouldn't cause a crash.
+TEST_F(NotificationTest, BinaryData) {
+  const char kNonUtf8Data[] = { '\xff', '\0' };
+  EXPECT_FALSE(IsStringUTF8(kNonUtf8Data));
+  Notification notification;
+  notification.data = kNonUtf8Data;
+  EXPECT_EQ("{ channel: \"\", data: \"\\u00FF\" }", notification.ToString());
+}
+
+}  // namespace
+}  // namespace notifier