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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/components/quick_answers/search_result_parsers/search_response_parser.h"
#include <memory>
#include <utility>
#include "base/functional/bind.h"
#include "base/values.h"
#include "chromeos/components/quick_answers/quick_answers_model.h"
#include "chromeos/components/quick_answers/search_result_parsers/result_parser.h"
namespace quick_answers {
namespace {
using base::Value;
// String to prepend to JSON responses to prevent XSSI. See http://go/xssi.
constexpr char kJsonSafetyPrefix[] = ")]}'\n";
} // namespace
SearchResponseParser::SearchResponseParser(
SearchResponseParserCallback complete_callback) {
complete_callback_ = std::move(complete_callback);
}
SearchResponseParser::~SearchResponseParser() {
if (complete_callback_)
std::move(complete_callback_).Run(/*quick_answer=*/nullptr);
}
void SearchResponseParser::ProcessResponse(
std::unique_ptr<std::string> response_body) {
if (response_body->length() < strlen(kJsonSafetyPrefix) ||
response_body->substr(0, strlen(kJsonSafetyPrefix)) !=
kJsonSafetyPrefix) {
LOG(ERROR) << "Invalid search response.";
std::move(complete_callback_).Run(nullptr);
return;
}
data_decoder::DataDecoder::ParseJsonIsolated(
response_body->substr(strlen(kJsonSafetyPrefix)),
base::BindOnce(&SearchResponseParser::OnJsonParsed,
weak_factory_.GetWeakPtr()));
}
void SearchResponseParser::OnJsonParsed(
data_decoder::DataDecoder::ValueOrError result) {
DCHECK(complete_callback_);
if (!result.has_value()) {
LOG(ERROR) << "JSON parsing failed: " << result.error();
std::move(complete_callback_).Run(nullptr);
return;
}
// Get the first result.
const Value::List* entries =
result->GetDict().FindListByDottedPath("results");
if (!entries) {
std::move(complete_callback_).Run(nullptr);
return;
}
for (const auto& entry : *entries) {
std::unique_ptr<QuickAnswersSession> quick_answers_session =
ProcessResult(&entry);
if (quick_answers_session) {
std::move(complete_callback_).Run(std::move(quick_answers_session));
return;
}
}
std::move(complete_callback_).Run(nullptr);
}
std::unique_ptr<QuickAnswersSession> SearchResponseParser::ProcessResult(
const Value* result) {
const base::Value::Dict& dict = result->GetDict();
auto one_namespace_type = dict.FindInt("oneNamespaceType");
if (!one_namespace_type.has_value()) {
// Can't find valid one namespace type from the response.
LOG(ERROR) << "Can't find valid one namespace type from the response.";
return nullptr;
}
std::unique_ptr<ResultParser> result_parser =
ResultParserFactory::Create(one_namespace_type.value());
if (!result_parser) {
return nullptr;
}
if (result_parser->SupportsNewInterface()) {
// Try to parse from StructuredResult, which supports Rich Answers.
std::unique_ptr<StructuredResult> structured_result =
result_parser->ParseInStructuredResult(dict);
if (!structured_result) {
return nullptr;
}
std::unique_ptr<QuickAnswer> quick_answer = std::make_unique<QuickAnswer>();
if (!result_parser->PopulateQuickAnswer(*structured_result,
quick_answer.get())) {
return nullptr;
}
std::unique_ptr<QuickAnswersSession> quick_answers_session =
std::make_unique<QuickAnswersSession>();
quick_answers_session->structured_result = std::move(structured_result);
quick_answers_session->quick_answer = std::move(quick_answer);
return quick_answers_session;
}
// If a parser does not support `StructuredResult`, falls back to `Parse`
// method. This is for a parser which has not migrated to the new interfaces
// yet.
std::unique_ptr<QuickAnswer> quick_answer = std::make_unique<QuickAnswer>();
if (!result_parser->Parse(dict, quick_answer.get())) {
return nullptr;
}
std::unique_ptr<QuickAnswersSession> quick_answers_session =
std::make_unique<QuickAnswersSession>();
quick_answers_session->quick_answer = std::move(quick_answer);
return quick_answers_session;
}
} // namespace quick_answers
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