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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_UPDATER_WIN_PROTOCOL_PARSER_XML_H_
#define CHROME_UPDATER_WIN_PROTOCOL_PARSER_XML_H_
// clang-format off
#include <objbase.h>
#include <msxml2.h>
// clang-format on
#include <cstdint>
#include <optional>
#include <string>
#include "base/containers/flat_map.h"
namespace updater {
struct OfflineManifestSystemRequirements {
std::string platform; // For example, "win".
// Expected host processor architecture that the app is compatible with.
// `arch` can be a single entry, or multiple entries separated with `,`.
// Entries prefixed with a `-` (negative entries) indicate non-compatible
// hosts.
//
// Examples:
// * `arch` == "x86".
// * `arch` == "x64".
// * `arch` == "x86,x64,-arm64": the app will fail installation if the
// underlying host is arm64.
std::string arch;
std::string min_os_version; // major.minor.
};
// Class that parses the XML manifest for offline installers.
//
// Only features that are used by Windows legacy offline installers are parsed.
class ProtocolParserXML final {
public:
struct Manifest {
std::string version;
std::string run;
std::string arguments;
};
struct Data {
std::string install_data_index;
std::string text;
};
struct App {
App();
App(const App& app);
~App();
std::string app_id;
Manifest manifest;
std::vector<Data> data;
};
struct Results {
Results();
Results(const Results& results);
~Results();
OfflineManifestSystemRequirements system_requirements;
std::vector<App> apps;
};
static std::optional<Results> Parse(const std::string& xml);
ProtocolParserXML(const ProtocolParserXML&) = delete;
ProtocolParserXML& operator=(const ProtocolParserXML&) = delete;
private:
ProtocolParserXML() = default;
using ElementHandler = bool (ProtocolParserXML::*)(IXMLDOMNode* node,
Results* results);
using ElementHandlerMap = base::flat_map<std::wstring, ElementHandler>;
std::optional<Results> DoParse(const std::string& response_xml);
// Helper functions to traverse the XML document.
bool ParseElement(const ElementHandlerMap& handler_map,
IXMLDOMNode* node,
Results* results);
bool ParseChildren(const ElementHandlerMap& handler_map,
IXMLDOMNode* node,
Results* results);
// DOM element handlers.
bool ParseAction(IXMLDOMNode* node, Results* results);
bool ParseActions(IXMLDOMNode* node, Results* results);
bool ParseApp(IXMLDOMNode* node, Results* results);
bool ParseData(IXMLDOMNode* node, Results* results);
bool ParseEvent(IXMLDOMNode* node, Results* results);
bool ParseManifest(IXMLDOMNode* node, Results* results);
bool ParseResponse(IXMLDOMNode* node, Results* results);
bool ParseSystemRequirements(IXMLDOMNode* node, Results* results);
bool ParseUpdateCheck(IXMLDOMNode* node, Results* results);
};
} // namespace updater
#endif // CHROME_UPDATER_WIN_PROTOCOL_PARSER_XML_H_
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