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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/media/router/discovery/dial/safe_dial_app_info_parser.h"
#include <utility>
#include "base/functional/bind.h"
#include "base/strings/string_util.h"
#include "chrome/browser/media/router/data_decoder_util.h"
#include "services/data_decoder/public/cpp/safe_xml_parser.h"
#include "url/gurl.h"
namespace media_router {
namespace {
DialAppState ParseDialAppState(const std::string& app_state) {
if (base::ToLowerASCII(app_state) == "running") {
return DialAppState::kRunning;
} else if (base::ToLowerASCII(app_state) == "stopped") {
return DialAppState::kStopped;
}
return DialAppState::kUnknown;
}
void ProcessAdditionalDataElement(const base::Value& additional_data_element,
ParsedDialAppInfo* out_app_info) {
const base::Value::List* child_elements =
data_decoder::GetXmlElementChildren(additional_data_element);
if (!child_elements) {
return;
}
for (const auto& child_element : *child_elements) {
std::string tag_name;
if (!data_decoder::GetXmlElementTagName(child_element, &tag_name)) {
continue;
}
std::string extra_data;
if (data_decoder::GetXmlElementText(child_element, &extra_data)) {
out_app_info->extra_data[tag_name] = extra_data;
}
}
}
// Parses |child_element| content, and sets corresponding fields of
// |out_app_info|. Returns ParsingResult::kSuccess if parsing succeeds.
SafeDialAppInfoParser::ParsingResult ProcessChildElement(
const base::Value& child_element,
ParsedDialAppInfo* out_app_info) {
std::string tag_name;
if (!data_decoder::GetXmlElementTagName(child_element, &tag_name)) {
return SafeDialAppInfoParser::ParsingResult::kInvalidXML;
}
if (tag_name == "name") {
if (!data_decoder::GetXmlElementText(child_element, &out_app_info->name)) {
return SafeDialAppInfoParser::ParsingResult::kFailToReadName;
}
} else if (tag_name == "options") {
out_app_info->allow_stop = data_decoder::GetXmlElementAttribute(
child_element, "allowStop") != "false";
} else if (tag_name == "link") {
out_app_info->href =
data_decoder::GetXmlElementAttribute(child_element, "href");
} else if (tag_name == "state") {
std::string state;
if (!data_decoder::GetXmlElementText(child_element, &state)) {
return SafeDialAppInfoParser::ParsingResult::kFailToReadState;
}
out_app_info->state = ParseDialAppState(state);
} else if (tag_name == "additionalData") {
ProcessAdditionalDataElement(child_element, out_app_info);
} else {
// We ignore unexpected elements outside of <additionalData>.
}
return SafeDialAppInfoParser::ParsingResult::kSuccess;
}
// Returns ParsingResult::kSuccess if mandatory fields (name, state) are valid.
// |app_info|: app info object to be validated.
SafeDialAppInfoParser::ParsingResult ValidateParsedAppInfo(
const ParsedDialAppInfo& app_info) {
if (app_info.name.empty()) {
return SafeDialAppInfoParser::ParsingResult::kMissingName;
}
if (app_info.state == DialAppState::kUnknown) {
return SafeDialAppInfoParser::ParsingResult::kInvalidState;
}
return SafeDialAppInfoParser::ParsingResult::kSuccess;
}
} // namespace
SafeDialAppInfoParser::SafeDialAppInfoParser() = default;
SafeDialAppInfoParser::~SafeDialAppInfoParser() = default;
void SafeDialAppInfoParser::Parse(const std::string& xml_text,
ParseCallback callback) {
DCHECK(callback);
GetDataDecoder().ParseXml(
xml_text, data_decoder::mojom::XmlParser::WhitespaceBehavior::kIgnore,
base::BindOnce(&SafeDialAppInfoParser::OnXmlParsingDone,
weak_factory_.GetWeakPtr(), std::move(callback)));
}
void SafeDialAppInfoParser::OnXmlParsingDone(
SafeDialAppInfoParser::ParseCallback callback,
data_decoder::DataDecoder::ValueOrError result) {
if (!result.has_value() || !result->is_dict()) {
std::move(callback).Run(nullptr, ParsingResult::kInvalidXML);
return;
}
// NOTE: enforce namespace check for <service> element in future. Namespace
// value will be "urn:dial-multiscreen-org:schemas:dial".
bool unique_service = true;
const base::Value* service_element =
data_decoder::FindXmlElementPath(*result, {"service"}, &unique_service);
if (!service_element || !unique_service) {
std::move(callback).Run(nullptr, ParsingResult::kInvalidXML);
return;
}
// Read optional @dialVer.
std::unique_ptr<ParsedDialAppInfo> app_info =
std::make_unique<ParsedDialAppInfo>();
app_info->dial_version =
data_decoder::GetXmlElementAttribute(*service_element, "dialVer");
// Fetch all the children of <service> element.
const base::Value::List* child_elements =
data_decoder::GetXmlElementChildren(*service_element);
if (!child_elements) {
std::move(callback).Run(nullptr, ParsingResult::kInvalidXML);
return;
}
ParsingResult parsing_result = ParsingResult::kSuccess;
for (const auto& child_element : *child_elements) {
parsing_result = ProcessChildElement(child_element, app_info.get());
if (parsing_result != ParsingResult::kSuccess) {
std::move(callback).Run(nullptr, parsing_result);
return;
}
}
// Validate mandatory fields (name, state).
parsing_result = ValidateParsedAppInfo(*app_info);
if (parsing_result != ParsingResult::kSuccess) {
std::move(callback).Run(nullptr, parsing_result);
return;
}
std::move(callback).Run(std::move(app_info), ParsingResult::kSuccess);
}
} // namespace media_router
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