Implement ManifestParser in content/.

content/renderer/manifest/manifest_parser.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 "content/renderer/manifest/manifest_parser.h"
+
+#include "base/json/json_reader.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "content/public/common/manifest.h"
+
+namespace content {
+
+Manifest ManifestParser::Parse(
+    const base::StringPiece& json) {
+  base::Value* value = base::JSONReader::Read(json);
+  if (!value) {
+    // TODO(mlamouri): get the JSON parsing error and report it to the developer
+    // console.
+    return Manifest();
+  }
+
+  if (value->GetType() != base::Value::TYPE_DICTIONARY) {
+    // TODO(mlamouri): provide a custom message to the developer console.
+    return Manifest();
+  }
+
+
+  base::DictionaryValue* dictionary = 0;
+  value->GetAsDictionary(&dictionary);
+  if (!dictionary) {
+    // TODO(mlamouri): provide a custom message to the developer console.
+    return Manifest();
+  }
+
+  Manifest manifest;
+
+  manifest.name = ParseName(*dictionary);
+  manifest.short_name = ParseShortName(*dictionary);
+
+  return manifest;
+}
+
+base::NullableString16 ManifestParser::ParseName(
+    const base::DictionaryValue& dictionary)  {
+  if (!dictionary.HasKey("name"))
+    return base::NullableString16();
+
+  base::string16 name;
+  if (!dictionary.GetString("name", &name)) {
+    // TODO(mlamouri): provide a custom message to the developer console.
+    return base::NullableString16();
+  }
+
+  base::TrimWhitespace(name, base::TRIM_ALL, &name);
+  return base::NullableString16(name, false);

[jochen (gone - plz use gerrit), 2014/09/12 11:55:18]

enforce a max length here?

[mlamouri (slow - plz ping), 2014/09/12 12:05:19]

I would prefer to avoid that. Maybe we could truncate the strings before sending
them to the browser process over IPC but I would prefer to not have that logic
in the parser.

[jochen (gone - plz use gerrit), 2014/09/12 12:09:40]

well, it's not really a parser, but also a builder for the manifest class

[mlamouri (slow - plz ping), 2014/09/12 12:16:47]

True. However, the string truncation would be a security measure for IPC, right?
If there is a consumer of the Manifest in the renderer process, would it make
sense to truncate those strings?

[jochen (gone - plz use gerrit), 2014/09/12 12:23:09]

is there a consumer?

[mlamouri (slow - plz ping), 2014/09/12 12:32:32]

I have implemented a GetManifest() method in the renderer process manager. The
reason is that Push API wants to use the Manifest so very likely the
PushDispatcher will be a consumer.

+}
+
+base::NullableString16 ManifestParser::ParseShortName(
+    const base::DictionaryValue& dictionary)  {
+  if (!dictionary.HasKey("short_name"))
+    return base::NullableString16();
+
+  base::string16 short_name;
+  if (!dictionary.GetString("short_name", &short_name)) {
+    // TODO(mlamouri): provide a custom message to the developer console.
+    return base::NullableString16();
+  }
+
+  base::TrimWhitespace(short_name, base::TRIM_ALL, &short_name);
+  return base::NullableString16(short_name, false);

[jochen (gone - plz use gerrit), 2014/09/12 11:55:18]

and here?

[mlamouri (slow - plz ping), 2014/09/12 12:05:19]

ditto.

+}
+
+} // namespace content