summaryrefslogtreecommitdiffstats
path: root/src/platformsupport/services/genericunix/qgenericunixservices.cpp
blob: 8e9923e208a690d210b425598e6e3a2e10729205 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qgenericunixservices_p.h"
#include <QtGui/private/qtguiglobal_p.h>

#include <QtCore/QDebug>
#include <QtCore/QFile>
#if QT_CONFIG(process)
# include <QtCore/QProcess>
#endif
#if QT_CONFIG(settings)
#include <QtCore/QSettings>
#endif
#include <QtCore/QStandardPaths>
#include <QtCore/QUrl>

#if QT_CONFIG(dbus)
// These QtCore includes are needed for xdg-desktop-portal support
#include <QtCore/private/qcore_unix_p.h>

#include <QtCore/QFileInfo>
#include <QtCore/QUrlQuery>

#include <QtDBus/QDBusConnection>
#include <QtDBus/QDBusMessage>
#include <QtDBus/QDBusPendingCall>
#include <QtDBus/QDBusPendingCallWatcher>
#include <QtDBus/QDBusPendingReply>
#include <QtDBus/QDBusUnixFileDescriptor>

#include <fcntl.h>

#endif // QT_CONFIG(dbus)

#include <stdlib.h>

QT_BEGIN_NAMESPACE

#if QT_CONFIG(multiprocess)

enum { debug = 0 };

static inline QByteArray detectDesktopEnvironment()
{
    const QByteArray xdgCurrentDesktop = qgetenv("XDG_CURRENT_DESKTOP");
    if (!xdgCurrentDesktop.isEmpty())
        return xdgCurrentDesktop.toUpper(); // KDE, GNOME, UNITY, LXDE, MATE, XFCE...

    // Classic fallbacks
    if (!qEnvironmentVariableIsEmpty("KDE_FULL_SESSION"))
        return QByteArrayLiteral("KDE");
    if (!qEnvironmentVariableIsEmpty("GNOME_DESKTOP_SESSION_ID"))
        return QByteArrayLiteral("GNOME");

    // Fallback to checking $DESKTOP_SESSION (unreliable)
    QByteArray desktopSession = qgetenv("DESKTOP_SESSION");

    // This can be a path in /usr/share/xsessions
    int slash = desktopSession.lastIndexOf('/');
    if (slash != -1) {
#if QT_CONFIG(settings)
        QSettings desktopFile(QFile::decodeName(desktopSession + ".desktop"), QSettings::IniFormat);
        desktopFile.beginGroup(QStringLiteral("Desktop Entry"));
        QByteArray desktopName = desktopFile.value(QStringLiteral("DesktopNames")).toByteArray();
        if (!desktopName.isEmpty())
            return desktopName;
#endif

        // try decoding just the basename
        desktopSession = desktopSession.mid(slash + 1);
    }

    if (desktopSession == "gnome")
        return QByteArrayLiteral("GNOME");
    else if (desktopSession == "xfce")
        return QByteArrayLiteral("XFCE");
    else if (desktopSession == "kde")
        return QByteArrayLiteral("KDE");

    return QByteArrayLiteral("UNKNOWN");
}

static inline bool checkExecutable(const QString &candidate, QString *result)
{
    *result = QStandardPaths::findExecutable(candidate);
    return !result->isEmpty();
}

static inline bool detectWebBrowser(const QByteArray &desktop,
                                    bool checkBrowserVariable,
                                    QString *browser)
{
    const char *browsers[] = {"google-chrome", "firefox", "mozilla", "opera"};

    browser->clear();
    if (checkExecutable(QStringLiteral("xdg-open"), browser))
        return true;

    if (checkBrowserVariable) {
        QByteArray browserVariable = qgetenv("DEFAULT_BROWSER");
        if (browserVariable.isEmpty())
            browserVariable = qgetenv("BROWSER");
        if (!browserVariable.isEmpty() && checkExecutable(QString::fromLocal8Bit(browserVariable), browser))
            return true;
    }

    if (desktop == QByteArray("KDE")) {
        // Konqueror launcher
        if (checkExecutable(QStringLiteral("kfmclient"), browser)) {
            browser->append(QLatin1String(" exec"));
            return true;
        }
    } else if (desktop == QByteArray("GNOME")) {
        if (checkExecutable(QStringLiteral("gnome-open"), browser))
            return true;
    }

    for (size_t i = 0; i < sizeof(browsers)/sizeof(char *); ++i)
        if (checkExecutable(QLatin1String(browsers[i]), browser))
            return true;
    return false;
}

static inline bool launch(const QString &launcher, const QUrl &url)
{
    const QString command = launcher + QLatin1Char(' ') + QLatin1String(url.toEncoded());
    if (debug)
        qDebug("Launching %s", qPrintable(command));
#if !QT_CONFIG(process)
    const bool ok = ::system(qPrintable(command + QLatin1String(" &")));
#else
    QStringList args = QProcess::splitCommand(command);
    const bool ok = !args.isEmpty() && QProcess::startDetached(args.takeFirst(), args);
#endif
    if (!ok)
        qWarning("Launch failed (%s)", qPrintable(command));
    return ok;
}

#if QT_CONFIG(dbus)
static inline bool checkNeedPortalSupport()
{
    return !QStandardPaths::locate(QStandardPaths::RuntimeLocation, QLatin1String("flatpak-info")).isEmpty() || qEnvironmentVariableIsSet("SNAP");
}

static inline bool isPortalReturnPermanent(const QDBusError &error)
{
    // A service unknown error isn't permanent, it just indicates that we
    // should fall back to the regular way. This check includes
    // QDBusError::NoError.
    return error.type() != QDBusError::ServiceUnknown;
}

static inline QDBusMessage xdgDesktopPortalOpenFile(const QUrl &url)
{
    // DBus signature:
    // OpenFile (IN   s      parent_window,
    //           IN   h      fd,
    //           IN   a{sv}  options,
    //           OUT  o      handle)
    // Options:
    // handle_token (s) -  A string that will be used as the last element of the @handle.
    // writable (b) - Whether to allow the chosen application to write to the file.

#ifdef O_PATH
    const int fd = qt_safe_open(QFile::encodeName(url.toLocalFile()), O_PATH);
    if (fd != -1) {
        QDBusMessage message = QDBusMessage::createMethodCall(QLatin1String("org.freedesktop.portal.Desktop"),
                                                              QLatin1String("/org/freedesktop/portal/desktop"),
                                                              QLatin1String("org.freedesktop.portal.OpenURI"),
                                                              QLatin1String("OpenFile"));

        QDBusUnixFileDescriptor descriptor;
        descriptor.giveFileDescriptor(fd);

        // FIXME parent_window_id and handle writable option
        message << QString() << QVariant::fromValue(descriptor) << QVariantMap();

        return QDBusConnection::sessionBus().call(message);
    }
#else
    Q_UNUSED(url)
#endif

    return QDBusMessage::createError(QDBusError::InternalError, qt_error_string());
}

static inline QDBusMessage xdgDesktopPortalOpenUrl(const QUrl &url)
{
    // DBus signature:
    // OpenURI (IN   s      parent_window,
    //          IN   s      uri,
    //          IN   a{sv}  options,
    //          OUT  o      handle)
    // Options:
    // handle_token (s) -  A string that will be used as the last element of the @handle.
    // writable (b) - Whether to allow the chosen application to write to the file.
    //                This key only takes effect the uri points to a local file that is exported in the document portal,
    //                and the chosen application is sandboxed itself.

    QDBusMessage message = QDBusMessage::createMethodCall(QLatin1String("org.freedesktop.portal.Desktop"),
                                                          QLatin1String("/org/freedesktop/portal/desktop"),
                                                          QLatin1String("org.freedesktop.portal.OpenURI"),
                                                          QLatin1String("OpenURI"));
    // FIXME parent_window_id and handle writable option
    message << QString() << url.toString() << QVariantMap();

    return QDBusConnection::sessionBus().call(message);
}

static inline QDBusMessage xdgDesktopPortalSendEmail(const QUrl &url)
{
    // DBus signature:
    // ComposeEmail (IN   s      parent_window,
    //               IN   a{sv}  options,
    //               OUT  o      handle)
    // Options:
    // address (s) - The email address to send to.
    // subject (s) - The subject for the email.
    // body (s) - The body for the email.
    // attachment_fds (ah) - File descriptors for files to attach.

    QUrlQuery urlQuery(url);
    QVariantMap options;
    options.insert(QLatin1String("address"), url.path());
    options.insert(QLatin1String("subject"), urlQuery.queryItemValue(QLatin1String("subject")));
    options.insert(QLatin1String("body"), urlQuery.queryItemValue(QLatin1String("body")));

    // O_PATH seems to be present since Linux 2.6.39, which is not case of RHEL 6
#ifdef O_PATH
    QList<QDBusUnixFileDescriptor> attachments;
    const QStringList attachmentUris = urlQuery.allQueryItemValues(QLatin1String("attachment"));

    for (const QString &attachmentUri : attachmentUris) {
        const int fd = qt_safe_open(QFile::encodeName(attachmentUri), O_PATH);
        if (fd != -1) {
            QDBusUnixFileDescriptor descriptor(fd);
            attachments << descriptor;
            qt_safe_close(fd);
        }
    }

    options.insert(QLatin1String("attachment_fds"), QVariant::fromValue(attachments));
#endif

    QDBusMessage message = QDBusMessage::createMethodCall(QLatin1String("org.freedesktop.portal.Desktop"),
                                                          QLatin1String("/org/freedesktop/portal/desktop"),
                                                          QLatin1String("org.freedesktop.portal.Email"),
                                                          QLatin1String("ComposeEmail"));

    // FIXME parent_window_id
    message << QString() << options;

    return QDBusConnection::sessionBus().call(message);
}
#endif // QT_CONFIG(dbus)

QByteArray QGenericUnixServices::desktopEnvironment() const
{
    static const QByteArray result = detectDesktopEnvironment();
    return result;
}

bool QGenericUnixServices::openUrl(const QUrl &url)
{
    if (url.scheme() == QLatin1String("mailto")) {
#if QT_CONFIG(dbus)
        if (checkNeedPortalSupport()) {
            QDBusError error = xdgDesktopPortalSendEmail(url);
            if (isPortalReturnPermanent(error))
                return !error.isValid();

            // service not running, fall back
        }
#endif
        return openDocument(url);
    }

#if QT_CONFIG(dbus)
    if (checkNeedPortalSupport()) {
        QDBusError error = xdgDesktopPortalOpenUrl(url);
        if (isPortalReturnPermanent(error))
            return !error.isValid();
    }
#endif

    if (m_webBrowser.isEmpty() && !detectWebBrowser(desktopEnvironment(), true, &m_webBrowser)) {
        qWarning("Unable to detect a web browser to launch '%s'", qPrintable(url.toString()));
        return false;
    }
    return launch(m_webBrowser, url);
}

bool QGenericUnixServices::openDocument(const QUrl &url)
{
#if QT_CONFIG(dbus)
    if (checkNeedPortalSupport()) {
        QDBusError error = xdgDesktopPortalOpenFile(url);
        if (isPortalReturnPermanent(error))
            return !error.isValid();
    }
#endif

    if (m_documentLauncher.isEmpty() && !detectWebBrowser(desktopEnvironment(), false, &m_documentLauncher)) {
        qWarning("Unable to detect a launcher for '%s'", qPrintable(url.toString()));
        return false;
    }
    return launch(m_documentLauncher, url);
}

#else
QByteArray QGenericUnixServices::desktopEnvironment() const
{
    return QByteArrayLiteral("UNKNOWN");
}

bool QGenericUnixServices::openUrl(const QUrl &url)
{
    Q_UNUSED(url)
    qWarning("openUrl() not supported on this platform");
    return false;
}

bool QGenericUnixServices::openDocument(const QUrl &url)
{
    Q_UNUSED(url)
    qWarning("openDocument() not supported on this platform");
    return false;
}

#endif // QT_NO_MULTIPROCESS

QT_END_NAMESPACE