/* This file is part of the KDE project
 *
 * Copyright (C) 2002 David Faure <faure@kde.org>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License version 2, as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "browserrun.h"

#include "browseropenorsavequestion.h"

#include <kconfiggroup.h>
#include <ksharedconfig.h>
#include <kmessagebox.h>
#include <KIO/CommandLauncherJob>
#include <kio/job.h>
#include <kio/jobuidelegate.h>
#include <kio/scheduler.h>
#include <kio/copyjob.h>
#include <kjobwidgets.h>
#include <klocalizedstring.h>
#include <kshell.h>
#include <kmimetypetrader.h>
#include <kprotocolmanager.h>

#include <QTemporaryFile>
#include <QMimeDatabase>
#include <QDebug>
#include <QStandardPaths>
#include <QFileDialog>

using namespace KParts;

class Q_DECL_HIDDEN BrowserRun::BrowserRunPrivate
{
public:
    bool m_bHideErrorDialog;
    bool m_bRemoveReferrer;
    bool m_bTrustedSource;
    KParts::OpenUrlArguments m_args;
    KParts::BrowserArguments m_browserArgs;

    KParts::ReadOnlyPart *m_part; // QGuardedPtr?
    QPointer<QWidget> m_window;
    QString m_mimeType;
    QString m_contentDisposition;
};

BrowserRun::BrowserRun(const QUrl &url, const KParts::OpenUrlArguments &args,
                       const KParts::BrowserArguments &browserArgs,
                       KParts::ReadOnlyPart *part, QWidget *window,
                       bool removeReferrer, bool trustedSource, bool hideErrorDialog)
    : KRun(url, window, false /* no GUI */),
      d(new BrowserRunPrivate)
{
    d->m_bHideErrorDialog = hideErrorDialog;
    d->m_bRemoveReferrer = removeReferrer;
    d->m_bTrustedSource = trustedSource;
    d->m_args = args;
    d->m_browserArgs = browserArgs;
    d->m_part = part;
    d->m_window = window;
}

BrowserRun::~BrowserRun()
{
    delete d;
}

KParts::ReadOnlyPart *BrowserRun::part() const
{
    return d->m_part;
}

QUrl BrowserRun::url() const
{
    return KRun::url();
}

void BrowserRun::init()
{
    if (d->m_bHideErrorDialog) {
        // ### KRun doesn't call a virtual method when it finds out that the URL
        // is either malformed, or points to a non-existing local file...
        // So we need to reimplement some of the checks, to handle d->m_bHideErrorDialog
        if (!KRun::url().isValid()) {
            redirectToError(KIO::ERR_MALFORMED_URL, KRun::url().toString());
            return;
        }

        if (isLocalFile())  {
            const QString localPath = KRun::url().toLocalFile();
            if (!QFile::exists(localPath)) {
                // qDebug() << localPath << "doesn't exist.";
                redirectToError(KIO::ERR_DOES_NOT_EXIST, localPath);
                return;
            }
        }
    }
    KRun::init();
}

void BrowserRun::scanFile()
{
    const QUrl url = KRun::url();
    // qDebug() << url;

    // Let's check for well-known extensions
    // Not when there is a query in the URL, in any case.
    // Optimization for http/https, findByURL doesn't trust extensions over http.
    QString protocol = url.scheme();

    if (!KProtocolInfo::proxiedBy(protocol).isEmpty()) {
        QString dummy;
        protocol = KProtocolManager::slaveProtocol(url, dummy);
    }

    if (!url.hasQuery() && !protocol.startsWith(QLatin1String("http")) &&
           (!url.path().endsWith(QLatin1Char('/')) || KProtocolManager::supportsListing(url))) {
        QMimeDatabase db;
        QMimeType mime = db.mimeTypeForUrl(url);
        if (!mime.isDefault() || isLocalFile()) {
            // qDebug() << "MIME TYPE is" << mime.name();
            mimeTypeDetermined(mime.name());
            return;
        }
    }

    QMap<QString, QString> &metaData = d->m_args.metaData();
    if (d->m_part) {
        const QString proto = d->m_part->url().scheme();

        if (proto == QLatin1String("https") || proto == QLatin1String("webdavs")) {
            metaData.insert(QStringLiteral("main_frame_request"), QStringLiteral("TRUE"));
            metaData.insert(QStringLiteral("ssl_was_in_use"), QStringLiteral("TRUE"));
            // metaData.insert(QStringLiteral("ssl_activate_warnings"), QStringLiteral("TRUE"));
        } else if (proto == QLatin1String("http") || proto == QLatin1String("webdav")) {
            // metaData.insert(QStringLiteral("ssl_activate_warnings"), QStringLiteral("TRUE"));
            metaData.insert(QStringLiteral("ssl_was_in_use"), QStringLiteral("FALSE"));
        }

        // Set the PropagateHttpHeader meta-data if it has not already been set...
        if (!metaData.contains(QStringLiteral("PropagateHttpHeader"))) {
            metaData.insert(QStringLiteral("PropagateHttpHeader"), QStringLiteral("TRUE"));
        }
    }

    KIO::TransferJob *job;
    if (d->m_browserArgs.doPost() && url.scheme().startsWith(QLatin1String("http"))) {
        job = KIO::http_post(url, d->m_browserArgs.postData, KIO::HideProgressInfo);
        job->addMetaData(QStringLiteral("content-type"), d->m_browserArgs.contentType());
    } else {
        job = KIO::get(url,
                       d->m_args.reload() ? KIO::Reload : KIO::NoReload,
                       KIO::HideProgressInfo);
    }

    if (d->m_bRemoveReferrer) {
        metaData.remove(QStringLiteral("referrer"));
    }

    job->addMetaData(metaData);
    KJobWidgets::setWindow(job, d->m_window);
    connect(job, &KIO::TransferJob::result,
            this, &BrowserRun::slotBrowserScanFinished);
    connect(job, static_cast<void (KIO::TransferJob::*)(KIO::Job*,const QString &)>(&KIO::TransferJob::mimetype),
            this, &BrowserRun::slotBrowserMimetype);
    setJob(job);
}

void BrowserRun::slotBrowserScanFinished(KJob *job)
{
    // qDebug() << job->error();
    if (job->error() == KIO::ERR_IS_DIRECTORY) {
        // It is in fact a directory. This happens when HTTP redirects to FTP.
        // Due to the "protocol doesn't support listing" code in BrowserRun, we
        // assumed it was a file.
        // qDebug() << "It is in fact a directory!";
        // Update our URL in case of a redirection
        KRun::setUrl(static_cast<KIO::TransferJob *>(job)->url());
        setJob(nullptr);
        mimeTypeDetermined(QStringLiteral("inode/directory"));
    } else {
        KRun::slotScanFinished(job);
    }
}

static QMimeType fixupMimeType(const QString &mimeType, const QString &fileName)
{
    QMimeDatabase db;
    QMimeType mime = db.mimeTypeForName(mimeType);
    if ((!mime.isValid() || mime.isDefault()) && !fileName.isEmpty()) {
        mime = db.mimeTypeForFile(fileName, QMimeDatabase::MatchExtension);
    }
    return mime;
}

void BrowserRun::slotBrowserMimetype(KIO::Job *_job, const QString &type)
{
    Q_ASSERT(_job == KRun::job()); Q_UNUSED(_job)
    KIO::TransferJob *job = static_cast<KIO::TransferJob *>(KRun::job());
    // Update our URL in case of a redirection
    //qDebug() << "old URL=" << KRun::url();
    //qDebug() << "new URL=" << job->url();
    setUrl(job->url());

    if (job->isErrorPage()) {
        d->m_mimeType = type;
        handleError(job);
        setJob(nullptr);
    } else {
        // qDebug() << "found" << type << "for" << KRun::url();

        // Suggested filename given by the server (e.g. HTTP content-disposition)
        // When set, we should really be saving instead of embedding
        const QString suggestedFileName = job->queryMetaData(QStringLiteral("content-disposition-filename"));
        setSuggestedFileName(suggestedFileName); // store it (in KRun)
        //qDebug() << "suggestedFileName=" << suggestedFileName;
        d->m_contentDisposition = job->queryMetaData(QStringLiteral("content-disposition-type"));

        const QString modificationTime = job->queryMetaData(QStringLiteral("content-disposition-modification-date"));
        if (!modificationTime.isEmpty()) {
            d->m_args.metaData().insert(QStringLiteral("content-disposition-modification-date"), modificationTime);
        }

        QMapIterator<QString, QString> it(job->metaData());
        while (it.hasNext()) {
            it.next();
            if (it.key().startsWith(QLatin1String("ssl_"), Qt::CaseInsensitive)) {
                d->m_args.metaData().insert(it.key(), it.value());
            }
        }

        // Make a copy to avoid a dead reference
        QString _type = type;
        job->putOnHold();
        setJob(nullptr);

        // If the current mime-type is the default mime-type, then attempt to
        // determine the "real" mimetype from the file name.
        QMimeType mime = fixupMimeType(_type, suggestedFileName.isEmpty() ? url().fileName() : suggestedFileName);
        if (mime.isValid() && mime.name() != _type) {
            _type = mime.name();
        }

        mimeTypeDetermined(_type);
    }
}

BrowserRun::NonEmbeddableResult BrowserRun::handleNonEmbeddable(const QString &mimeType)
{
    return handleNonEmbeddable(mimeType, nullptr);
}

BrowserRun::NonEmbeddableResult BrowserRun::handleNonEmbeddable(const QString &_mimeType, KService::Ptr *selectedService)
{
    QString mimeType(_mimeType);
    Q_ASSERT(!hasFinished());   // only come here if the mimetype couldn't be embedded
    // Support for saving remote files.
    if (mimeType != QLatin1String("inode/directory") && // dirs can't be saved
            !KRun::url().isLocalFile()) {
        if (isTextExecutable(mimeType)) {
            mimeType = QStringLiteral("text/plain");    // view, don't execute
        }
        // ... -> ask whether to save
        BrowserOpenOrSaveQuestion question(d->m_window, KRun::url(), mimeType);
        question.setSuggestedFileName(suggestedFileName());
        if (selectedService) {
            question.setFeatures(BrowserOpenOrSaveQuestion::ServiceSelection);
        }
        BrowserOpenOrSaveQuestion::Result res = question.askOpenOrSave();
        if (res == BrowserOpenOrSaveQuestion::Save) {
            save(KRun::url(), suggestedFileName());
            // qDebug() << "Save: returning Handled";
            setFinished(true);
            return Handled;
        } else if (res == BrowserOpenOrSaveQuestion::Cancel) {
            // saving done or canceled
            // qDebug() << "Cancel: returning Handled";
            setFinished(true);
            return Handled;
        } else { // "Open" chosen (done by KRun::foundMimeType, called when returning NotHandled)
            // If we were in a POST, we can't just pass a URL to an external application.
            // We must save the data to a tempfile first.
            if (d->m_browserArgs.doPost()) {
                // qDebug() << "request comes from a POST, can't pass a URL to another app, need to save";
                d->m_mimeType = mimeType;
                QString extension;
                QString fileName = suggestedFileName().isEmpty() ? KRun::url().fileName() : suggestedFileName();
                int extensionPos = fileName.lastIndexOf(QLatin1Char('.'));
                if (extensionPos != -1) {
                    extension = fileName.mid(extensionPos);    // keep the '.'
                }
                QTemporaryFile tempFile(QDir::tempPath() + QLatin1Char('/') + QCoreApplication::applicationName() + QLatin1String("XXXXXX") + extension);
                tempFile.setAutoRemove(false);
                tempFile.open();
                QUrl destURL = QUrl::fromLocalFile(tempFile.fileName());
                KIO::Job *job = KIO::file_copy(KRun::url(), destURL, 0600, KIO::Overwrite);
                KJobWidgets::setWindow(job, d->m_window);
                connect(job, &KIO::Job::result,
                        this, &BrowserRun::slotCopyToTempFileResult);
                return Delayed; // We'll continue after the job has finished
            }
            if (selectedService && question.selectedService()) {
                *selectedService = question.selectedService();
                // KRun will use this when starting an app
                KRun::setPreferredService(question.selectedService()->desktopEntryName());
            }
        }
    }

    // Check if running is allowed
    if (!d->m_bTrustedSource &&  // ... and untrusted source...
            !allowExecution(mimeType, KRun::url())) {  // ...and the user said no (for executables etc.)
        setFinished(true);
        return Handled;
    }

    KIO::Scheduler::publishSlaveOnHold(); // publish any slave on hold so it can be reused.
    return NotHandled;
}

//static
bool BrowserRun::allowExecution(const QString &mimeType, const QUrl &url)
{
    if (!KRun::isExecutable(mimeType)) {
        return true;
    }

    if (!url.isLocalFile()) { // Don't permit to execute remote files
        return false;
    }

    return (KMessageBox::warningContinueCancel(nullptr,
            i18n("Do you really want to execute '%1'?", url.toDisplayString()),
            i18n("Execute File?"), KGuiItem(i18n("Execute"))) == KMessageBox::Continue);
}

//static, deprecated
#if KPARTS_BUILD_DEPRECATED_SINCE(5, 0)
BrowserRun::AskSaveResult BrowserRun::askSave(const QUrl &url, KService::Ptr offer, const QString &mimeType, const QString &suggestedFileName)
{
    Q_UNUSED(offer);
    BrowserOpenOrSaveQuestion question(nullptr, url, mimeType);
    question.setSuggestedFileName(suggestedFileName);
    const BrowserOpenOrSaveQuestion::Result result = question.askOpenOrSave();
    return result == BrowserOpenOrSaveQuestion::Save ? Save
           : BrowserOpenOrSaveQuestion::Open ? Open
           : Cancel;
}
#endif

//static, deprecated
#if KPARTS_BUILD_DEPRECATED_SINCE(5, 0)
BrowserRun::AskSaveResult BrowserRun::askEmbedOrSave(const QUrl &url, const QString &mimeType, const QString &suggestedFileName, int flags)
{
    BrowserOpenOrSaveQuestion question(nullptr, url, mimeType);
    question.setSuggestedFileName(suggestedFileName);
    const BrowserOpenOrSaveQuestion::Result result = question.askEmbedOrSave(flags);
    return result == BrowserOpenOrSaveQuestion::Save ? Save
           : result == BrowserOpenOrSaveQuestion::Embed ? Open
           : Cancel;
}
#endif

// Default implementation, overridden in KHTMLRun
void BrowserRun::save(const QUrl &url, const QString &suggestedFileName)
{
    saveUrl(url, suggestedFileName, d->m_window, d->m_args);
}

#if KPARTS_BUILD_DEPRECATED_SINCE(4, 4)
// static
void BrowserRun::simpleSave(const QUrl &url, const QString &suggestedFileName,
                            QWidget *window)
{
    saveUrl(url, suggestedFileName, window, KParts::OpenUrlArguments());
}
#endif

void KParts::BrowserRun::saveUrl(const QUrl &url, const QString &suggestedFileName,
                                 QWidget *window, const KParts::OpenUrlArguments &args)
{
    // DownloadManager <-> konqueror integration
    // find if the integration is enabled
    // the empty key  means no integration
    // only use the downloadmanager for non-local urls
    if (!url.isLocalFile()) {
        KConfigGroup cfg = KSharedConfig::openConfig(QStringLiteral("konquerorrc"), KConfig::NoGlobals)->group("HTML Settings");
        QString downloadManager = cfg.readPathEntry("DownloadManager", QString());
        if (!downloadManager.isEmpty()) {
            // then find the download manager location
            // qDebug() << "Using: "<<downloadManager <<" as Download Manager";
            if (QStandardPaths::findExecutable(downloadManager).isEmpty()) {
                QString errMsg = i18n("The Download Manager (%1) could not be found in your $PATH ", downloadManager);
                QString errMsgEx = i18n("Try to reinstall it  \n\nThe integration with Konqueror will be disabled.");
                KMessageBox::detailedSorry(nullptr, errMsg, errMsgEx);
                cfg.writePathEntry("DownloadManager", QString());
                cfg.sync();
            } else {
                QStringList args;
                args << url.toString();
                if (!suggestedFileName.isEmpty()) {
                    args << suggestedFileName;
                }

                // qDebug() << "Calling command" << downloadManager << args;
                // slave is already on hold (slotBrowserMimetype())
                KIO::Scheduler::publishSlaveOnHold();

                auto *job = new KIO::CommandLauncherJob(downloadManager, args);
                job->setExecutable(downloadManager);
                job->setUiDelegate(new KDialogJobUiDelegate(KJobUiDelegate::AutoHandlingEnabled, window));
                job->start();
                return;
            }
        }
    }

    // no download manager available, let's do it ourself
    QFileDialog *dlg = new QFileDialog(window);
    dlg->setAcceptMode(QFileDialog::AcceptSave);
    dlg->setWindowTitle(i18n("Save As"));
    dlg->setOption(QFileDialog::DontConfirmOverwrite, false);

    QString name;
    if (!suggestedFileName.isEmpty()) {
        name = suggestedFileName;
    } else {
        name = url.fileName();    // can be empty, e.g. in case http://www.kde.org/
    }

    dlg->selectFile(name);
    if (dlg->exec()) {
        QUrl destURL(dlg->selectedUrls().at(0));
        if (destURL.isValid()) {
            saveUrlUsingKIO(url, destURL, window, args.metaData());
        }
    }
    delete dlg;
}

void BrowserRun::saveUrlUsingKIO(const QUrl &srcUrl, const QUrl &destUrl,
                                 QWidget *window, const QMap<QString, QString> &metaData)
{
    KIO::FileCopyJob *job = KIO::file_copy(srcUrl, destUrl, -1, KIO::Overwrite);

    const QString modificationTime = metaData[QStringLiteral("content-disposition-modification-date")];
    if (!modificationTime.isEmpty()) {
        job->setModificationTime(QDateTime::fromString(modificationTime, Qt::RFC2822Date));
    }
    job->setMetaData(metaData);
    job->addMetaData(QStringLiteral("MaxCacheSize"), QStringLiteral("0")); // Don't store in http cache.
    job->addMetaData(QStringLiteral("cache"), QStringLiteral("cache")); // Use entry from cache if available.
    KJobWidgets::setWindow(job, window);
    job->uiDelegate()->setAutoErrorHandlingEnabled(true);
}

void BrowserRun::handleError(KJob *job)
{
    if (!job) {   // Shouldn't happen
        qWarning() << "handleError called with job=0! hideErrorDialog=" << d->m_bHideErrorDialog;
        return;
    }

    KIO::TransferJob *tjob = qobject_cast<KIO::TransferJob *>(job);
    if (tjob && tjob->isErrorPage() && !job->error()) {
        // The default handling of error pages is to show them like normal pages
        // But this is done here in handleError so that KHTMLRun can reimplement it
        tjob->putOnHold();
        setJob(nullptr);
        if (!d->m_mimeType.isEmpty()) {
            mimeTypeDetermined(d->m_mimeType);
        }
        return;
    }

    if (d->m_bHideErrorDialog && job->error() != KIO::ERR_NO_CONTENT) {
        redirectToError(job->error(), job->errorText());
        return;
    }

    // Reuse code in KRun, to benefit from d->m_showingError etc.
    KRun::handleError(job);
}

// static
QUrl BrowserRun::makeErrorUrl(int error, const QString &errorText, const QUrl &initialUrl)
{
    /*
     * The format of the error:/ URL is error:/?query#url,
     * where two variables are passed in the query:
     * error = int kio error code, errText = QString error text from kio
     * The sub-url is the URL that we were trying to open.
     */
    QUrl newURL(QStringLiteral("error:/?error=%1&errText=%2")
                .arg(error)
                .arg(QString::fromUtf8(QUrl::toPercentEncoding(errorText))));

    QString cleanedOrigUrl = initialUrl.toString();
    QUrl runURL(cleanedOrigUrl);
    if (runURL.isValid()) {
        runURL.setPassword(QString()); // don't put the password in the error URL
        cleanedOrigUrl = runURL.toString();
    }

    newURL.setFragment(cleanedOrigUrl);
    return newURL;
}

void BrowserRun::redirectToError(int error, const QString &errorText)
{
    /**
     * To display this error in KHTMLPart instead of inside a dialog box,
     * we tell konq that the mimetype is text/html, and we redirect to
     * an error:/ URL that sends the info to khtml.
     */
    KRun::setUrl(makeErrorUrl(error, errorText, url()));
    setJob(nullptr);
    mimeTypeDetermined(QStringLiteral("text/html"));
}

void BrowserRun::slotCopyToTempFileResult(KJob *job)
{
    if (job->error()) {
        job->uiDelegate()->showErrorMessage();
    } else {
        // Same as KRun::foundMimeType but with a different URL
        (void)(KRun::runUrl(static_cast<KIO::FileCopyJob *>(job)->destUrl(), d->m_mimeType, d->m_window, KRun::RunFlags(KRun::RunExecutables)));
    }
    setError(true);   // see above
    setFinished(true);
}

bool BrowserRun::isTextExecutable(const QString &mimeType)
{
    return (mimeType == QLatin1String("application/x-desktop") ||
            mimeType == QLatin1String("application/x-shellscript"));
}

bool BrowserRun::hideErrorDialog() const
{
    return d->m_bHideErrorDialog;
}

QString BrowserRun::contentDisposition() const
{
    return d->m_contentDisposition;
}

bool BrowserRun::serverSuggestsSave() const
{
    // RfC 2183, section 2.8:
    // Unrecognized disposition types should be treated as `attachment'.
    return !contentDisposition().isEmpty() && (contentDisposition() != QLatin1String("inline"));
}

KParts::OpenUrlArguments &KParts::BrowserRun::arguments()
{
    return d->m_args;
}

KParts::BrowserArguments &KParts::BrowserRun::browserArguments()
{
    return d->m_browserArgs;
}

#include "moc_browserrun.cpp"
