blob: b02b01020e089ef42e0c9c9997cbf9d85c338e83 [file] [log] [blame]
// 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 "chrome/utility/media_router/dial_device_description_parser_impl.h"
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>
#include <utility>
#include "base/memory/ptr_util.h"
#include "base/strings/stringprintf.h"
#include "mojo/public/cpp/bindings/strong_binding.h"
#include "third_party/libxml/chromium/libxml_utils.h"
namespace {
enum ErrorType {
NONE,
MISSING_UNIQUE_ID,
MISSING_FRIENDLY_NAME,
};
ErrorType Validate(const chrome::mojom::DialDeviceDescription& description) {
if (description.unique_id.empty()) {
return ErrorType::MISSING_UNIQUE_ID;
}
if (description.friendly_name.empty()) {
return ErrorType::MISSING_FRIENDLY_NAME;
}
return ErrorType::NONE;
}
// If friendly name does not exist, fall back to use model name + last 4
// digits of UUID as friendly name.
std::string ComputeFriendlyName(const std::string& unique_id,
const std::string& model_name) {
if (model_name.empty() || unique_id.length() < 4)
return std::string();
std::string trimmed_unique_id = unique_id.substr(unique_id.length() - 4);
return base::StringPrintf("%s [%s]", model_name.c_str(),
trimmed_unique_id.c_str());
}
} // namespace
namespace media_router {
DialDeviceDescriptionParserImpl::DialDeviceDescriptionParserImpl() = default;
DialDeviceDescriptionParserImpl::~DialDeviceDescriptionParserImpl() {
DCHECK(thread_checker_.CalledOnValidThread());
}
// static
void DialDeviceDescriptionParserImpl::Create(
chrome::mojom::DialDeviceDescriptionParserRequest request) {
mojo::MakeStrongBinding(base::MakeUnique<DialDeviceDescriptionParserImpl>(),
std::move(request));
}
void DialDeviceDescriptionParserImpl::ParseDialDeviceDescription(
const std::string& device_description_xml_data,
const ParseDialDeviceDescriptionCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(!callback.is_null());
chrome::mojom::DialDeviceDescriptionPtr device_description =
Parse(device_description_xml_data);
callback.Run(std::move(device_description));
}
chrome::mojom::DialDeviceDescriptionPtr DialDeviceDescriptionParserImpl::Parse(
const std::string& xml) {
XmlReader xml_reader;
if (!xml_reader.Load(xml))
return nullptr;
chrome::mojom::DialDeviceDescriptionPtr out =
chrome::mojom::DialDeviceDescription::New();
while (xml_reader.Read()) {
xml_reader.SkipToElement();
std::string node_name(xml_reader.NodeName());
if (node_name == "UDN") {
if (!xml_reader.ReadElementContent(&out->unique_id))
return nullptr;
} else if (node_name == "friendlyName") {
if (!xml_reader.ReadElementContent(&out->friendly_name))
return nullptr;
} else if (node_name == "modelName") {
if (!xml_reader.ReadElementContent(&out->model_name))
return nullptr;
} else if (node_name == "deviceType") {
if (!xml_reader.ReadElementContent(&out->device_type))
return nullptr;
}
}
if (out->friendly_name.empty())
out->friendly_name = ComputeFriendlyName(out->unique_id, out->model_name);
ErrorType error = Validate(*out);
if (error != ErrorType::NONE) {
DLOG(WARNING) << "Device description failed to validate: " << error;
return nullptr;
}
return out;
}
} // namespace media_router