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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef APIBEHAVIOR_H
#define APIBEHAVIOR_H
#include "types.h"
#include "utils.h"
#include <QtHttpServer/QHttpServer>
#include <QtConcurrent/qtconcurrentrun.h>
#include <optional>
template<typename T, typename = void>
class CrudApi
{
};
template<typename T>
class CrudApi<T,
std::enable_if_t<std::conjunction_v<std::is_base_of<Jsonable, T>,
std::is_base_of<Updatable, T>>>>
{
public:
explicit CrudApi(const IdMap<T> &data, std::unique_ptr<FromJsonFactory<T>> factory)
: data(data), factory(std::move(factory))
{
}
QFuture<QHttpServerResponse> getPaginatedList(const QHttpServerRequest &request) const
{
using PaginatorType = Paginator<IdMap<T>>;
std::optional<qsizetype> maybePage;
std::optional<qsizetype> maybePerPage;
std::optional<qint64> maybeDelay;
if (request.query().hasQueryItem("page"))
maybePage = request.query().queryItemValue("page").toLongLong();
if (request.query().hasQueryItem("per_page"))
maybePerPage = request.query().queryItemValue("per_page").toLongLong();
if (request.query().hasQueryItem("delay"))
maybeDelay = request.query().queryItemValue("delay").toLongLong();
if ((maybePage && *maybePage < 1) || (maybePerPage && *maybePerPage < 1)) {
return QtConcurrent::run([]() {
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
});
}
PaginatorType paginator(data, maybePage ? *maybePage : PaginatorType::defaultPage,
maybePerPage ? *maybePerPage : PaginatorType::defaultPageSize);
return QtConcurrent::run([paginator = std::move(paginator), maybeDelay]() {
if (maybeDelay)
QThread::sleep(*maybeDelay);
return paginator.isValid()
? QHttpServerResponse(paginator.toJson())
: QHttpServerResponse(QHttpServerResponder::StatusCode::NoContent);
});
}
QHttpServerResponse getItem(qint64 itemId) const
{
const auto item = data.find(itemId);
return item != data.end() ? QHttpServerResponse(item->toJson())
: QHttpServerResponse(QHttpServerResponder::StatusCode::NotFound);
}
//! [POST return different status code example]
QHttpServerResponse postItem(const QHttpServerRequest &request)
{
const std::optional<QJsonObject> json = byteArrayToJsonObject(request.body());
if (!json)
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
const std::optional<T> item = factory->fromJson(*json);
if (!item)
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
if (data.contains(item->id))
return QHttpServerResponse(QHttpServerResponder::StatusCode::AlreadyReported);
const auto entry = data.insert(item->id, *item);
return QHttpServerResponse(entry->toJson(), QHttpServerResponder::StatusCode::Created);
}
//! [POST return different status code example]
QHttpServerResponse updateItem(qint64 itemId, const QHttpServerRequest &request)
{
const std::optional<QJsonObject> json = byteArrayToJsonObject(request.body());
if (!json)
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
auto item = data.find(itemId);
if (item == data.end())
return QHttpServerResponse(QHttpServerResponder::StatusCode::NoContent);
if (!item->update(*json))
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
return QHttpServerResponse(item->toJson());
}
QHttpServerResponse updateItemFields(qint64 itemId, const QHttpServerRequest &request)
{
const std::optional<QJsonObject> json = byteArrayToJsonObject(request.body());
if (!json)
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
auto item = data.find(itemId);
if (item == data.end())
return QHttpServerResponse(QHttpServerResponder::StatusCode::NoContent);
item->updateFields(*json);
return QHttpServerResponse(item->toJson());
}
QHttpServerResponse deleteItem(qint64 itemId)
{
if (!data.remove(itemId))
return QHttpServerResponse(QHttpServerResponder::StatusCode::NoContent);
return QHttpServerResponse(QHttpServerResponder::StatusCode::Ok);
}
private:
IdMap<T> data;
std::unique_ptr<FromJsonFactory<T>> factory;
};
class SessionApi
{
public:
explicit SessionApi(const IdMap<SessionEntry> &sessions,
std::unique_ptr<FromJsonFactory<SessionEntry>> factory)
: sessions(sessions), factory(std::move(factory))
{
}
QHttpServerResponse registerSession(const QHttpServerRequest &request)
{
const auto json = byteArrayToJsonObject(request.body());
if (!json)
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
const auto item = factory->fromJson(*json);
if (!item)
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
const auto session = sessions.insert(item->id, *item);
session->startSession();
return QHttpServerResponse(session->toJson());
}
QHttpServerResponse login(const QHttpServerRequest &request)
{
const auto json = byteArrayToJsonObject(request.body());
if (!json || !json->contains("email") || !json->contains("password"))
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
auto maybeSession = std::find_if(
sessions.begin(), sessions.end(),
[email = json->value("email").toString(),
password = json->value("password").toString()](const auto &it) {
return it.password == password && it.email == email;
});
if (maybeSession == sessions.end()) {
return QHttpServerResponse(QHttpServerResponder::StatusCode::NotFound);
}
maybeSession->startSession();
return QHttpServerResponse(maybeSession->toJson());
}
QHttpServerResponse logout(const QHttpServerRequest &request)
{
const auto maybeToken = getTokenFromRequest(request);
if (!maybeToken)
return QHttpServerResponse(QHttpServerResponder::StatusCode::BadRequest);
auto maybeSession = std::find(sessions.begin(), sessions.end(), *maybeToken);
if (maybeSession != sessions.end())
maybeSession->endSession();
return QHttpServerResponse(QHttpServerResponder::StatusCode::Ok);
}
bool authorize(const QHttpServerRequest &request) const
{
const auto maybeToken = getTokenFromRequest(request);
if (maybeToken) {
const auto maybeSession = std::find(sessions.begin(), sessions.end(), *maybeToken);
return maybeSession != sessions.end() && *maybeSession == *maybeToken;
}
return false;
}
private:
IdMap<SessionEntry> sessions;
std::unique_ptr<FromJsonFactory<SessionEntry>> factory;
};
#endif // APIBEHAVIOR_H
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