downloadhelpers.cpp

Go to the documentation of this file.

/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#include "downloadhelpers.h"
#include <QFuture>
#include <QFile>
#include <QtDebug>
#include <util/sll/either.h>
#include <util/sll/visitor.h>
#include <util/sys/paths.h>
#include <util/xpc/util.h>
#include <util/threads/futures.h>
#include <interfaces/core/ientitymanager.h>
 
namespace LC::Util
{
    std::optional<QFuture<TempResultType_t>> DownloadAsTemporary (IEntityManager *iem,
            const QUrl& url, DownloadParams params)
    {
        const auto& path = Util::GetTemporaryName ();
        auto e = Util::MakeEntity (url,
                path,
                DoNotSaveInHistory |
                    Internal |
                    DoNotNotifyUser |
                    NotPersistent);
        e.Mime_ = std::move (params.Mime_);
        e.Additional_ = std::move (params.Additional_);
 
        auto res = iem->DelegateEntity (e);
        if (!res)
        {
            qWarning () << Q_FUNC_INFO
                    << "delegation failed for"
                    << url;
            return {};
        }
 
        return Util::Sequence (params.Context_, res.DownloadResult_) >>
                Util::Visitor
                {
                    [] (const IDownload::Error& err) { return Util::MakeReadyFuture (TempResultType_t::Left (err)); },
                    [path] (IDownload::Success)
                    {
                        QFile file { path };
                        auto removeGuard = Util::MakeScopeGuard ([&file] { file.remove (); });
                        if (!file.open (QIODevice::ReadOnly))
                        {
                            qWarning () << Q_FUNC_INFO
                                    << "unable to open downloaded file"
                                    << file.errorString ();
                            return Util::MakeReadyFuture (TempResultType_t::Left ({
                                    IDownload::Error::Type::LocalError,
                                    "unable to open file"
                            }));
                        }
 
                        return Util::MakeReadyFuture (TempResultType_t::Right (file.readAll ()));
                    }
                };
    }
 
}