1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the plugins of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include "qgenericunixservices_p.h"
41#include <QtGui/private/qtguiglobal_p.h>
42
43#include <QtCore/QDebug>
44#include <QtCore/QFile>
45#if QT_CONFIG(process)
46# include <QtCore/QProcess>
47#endif
48#if QT_CONFIG(settings)
49#include <QtCore/QSettings>
50#endif
51#include <QtCore/QStandardPaths>
52#include <QtCore/QUrl>
53
54#if QT_CONFIG(dbus)
55// These QtCore includes are needed for xdg-desktop-portal support
56#include <QtCore/private/qcore_unix_p.h>
57
58#include <QtCore/QFileInfo>
59#include <QtCore/QUrlQuery>
60
61#include <QtDBus/QDBusConnection>
62#include <QtDBus/QDBusMessage>
63#include <QtDBus/QDBusPendingCall>
64#include <QtDBus/QDBusPendingCallWatcher>
65#include <QtDBus/QDBusPendingReply>
66#include <QtDBus/QDBusUnixFileDescriptor>
67
68#include <fcntl.h>
69
70#endif // QT_CONFIG(dbus)
71
72#include <stdlib.h>
73
74QT_BEGIN_NAMESPACE
75
76#if QT_CONFIG(multiprocess)
77
78enum { debug = 0 };
79
80static inline QByteArray detectDesktopEnvironment()
81{
82 const QByteArray xdgCurrentDesktop = qgetenv("XDG_CURRENT_DESKTOP");
83 if (!xdgCurrentDesktop.isEmpty())
84 return xdgCurrentDesktop.toUpper(); // KDE, GNOME, UNITY, LXDE, MATE, XFCE...
85
86 // Classic fallbacks
87 if (!qEnvironmentVariableIsEmpty("KDE_FULL_SESSION"))
88 return QByteArrayLiteral("KDE");
89 if (!qEnvironmentVariableIsEmpty("GNOME_DESKTOP_SESSION_ID"))
90 return QByteArrayLiteral("GNOME");
91
92 // Fallback to checking $DESKTOP_SESSION (unreliable)
93 QByteArray desktopSession = qgetenv("DESKTOP_SESSION");
94
95 // This can be a path in /usr/share/xsessions
96 int slash = desktopSession.lastIndexOf('/');
97 if (slash != -1) {
98#if QT_CONFIG(settings)
99 QSettings desktopFile(QFile::decodeName(desktopSession + ".desktop"), QSettings::IniFormat);
100 desktopFile.beginGroup(QStringLiteral("Desktop Entry"));
101 QByteArray desktopName = desktopFile.value(QStringLiteral("DesktopNames")).toByteArray();
102 if (!desktopName.isEmpty())
103 return desktopName;
104#endif
105
106 // try decoding just the basename
107 desktopSession = desktopSession.mid(slash + 1);
108 }
109
110 if (desktopSession == "gnome")
111 return QByteArrayLiteral("GNOME");
112 else if (desktopSession == "xfce")
113 return QByteArrayLiteral("XFCE");
114 else if (desktopSession == "kde")
115 return QByteArrayLiteral("KDE");
116
117 return QByteArrayLiteral("UNKNOWN");
118}
119
120static inline bool checkExecutable(const QString &candidate, QString *result)
121{
122 *result = QStandardPaths::findExecutable(candidate);
123 return !result->isEmpty();
124}
125
126static inline bool detectWebBrowser(const QByteArray &desktop,
127 bool checkBrowserVariable,
128 QString *browser)
129{
130 const char *browsers[] = {"google-chrome", "firefox", "mozilla", "opera"};
131
132 browser->clear();
133 if (checkExecutable(QStringLiteral("xdg-open"), browser))
134 return true;
135
136 if (checkBrowserVariable) {
137 QByteArray browserVariable = qgetenv("DEFAULT_BROWSER");
138 if (browserVariable.isEmpty())
139 browserVariable = qgetenv("BROWSER");
140 if (!browserVariable.isEmpty() && checkExecutable(QString::fromLocal8Bit(browserVariable), browser))
141 return true;
142 }
143
144 if (desktop == QByteArray("KDE")) {
145 // Konqueror launcher
146 if (checkExecutable(QStringLiteral("kfmclient"), browser)) {
147 browser->append(QLatin1String(" exec"));
148 return true;
149 }
150 } else if (desktop == QByteArray("GNOME")) {
151 if (checkExecutable(QStringLiteral("gnome-open"), browser))
152 return true;
153 }
154
155 for (size_t i = 0; i < sizeof(browsers)/sizeof(char *); ++i)
156 if (checkExecutable(QLatin1String(browsers[i]), browser))
157 return true;
158 return false;
159}
160
161static inline bool launch(const QString &launcher, const QUrl &url)
162{
163 const QString command = launcher + QLatin1Char(' ') + QLatin1String(url.toEncoded());
164 if (debug)
165 qDebug("Launching %s", qPrintable(command));
166#if !QT_CONFIG(process)
167 const bool ok = ::system(qPrintable(command + QLatin1String(" &")));
168#else
169 QStringList args = QProcess::splitCommand(command);
170 bool ok = false;
171 if (!args.isEmpty()) {
172 QString program = args.takeFirst();
173 ok = QProcess::startDetached(program, args);
174 }
175#endif
176 if (!ok)
177 qWarning("Launch failed (%s)", qPrintable(command));
178 return ok;
179}
180
181#if QT_CONFIG(dbus)
182static inline bool checkNeedPortalSupport()
183{
184 return !QStandardPaths::locate(QStandardPaths::RuntimeLocation, QLatin1String("flatpak-info")).isEmpty() || qEnvironmentVariableIsSet("SNAP");
185}
186
187static inline bool isPortalReturnPermanent(const QDBusError &error)
188{
189 // A service unknown error isn't permanent, it just indicates that we
190 // should fall back to the regular way. This check includes
191 // QDBusError::NoError.
192 return error.type() != QDBusError::ServiceUnknown && error.type() != QDBusError::AccessDenied;
193}
194
195static inline QDBusMessage xdgDesktopPortalOpenFile(const QUrl &url)
196{
197 // DBus signature:
198 // OpenFile (IN s parent_window,
199 // IN h fd,
200 // IN a{sv} options,
201 // OUT o handle)
202 // Options:
203 // handle_token (s) - A string that will be used as the last element of the @handle.
204 // writable (b) - Whether to allow the chosen application to write to the file.
205
206#ifdef O_PATH
207 const int fd = qt_safe_open(QFile::encodeName(url.toLocalFile()), O_PATH);
208 if (fd != -1) {
209 QDBusMessage message = QDBusMessage::createMethodCall(QLatin1String("org.freedesktop.portal.Desktop"),
210 QLatin1String("/org/freedesktop/portal/desktop"),
211 QLatin1String("org.freedesktop.portal.OpenURI"),
212 QLatin1String("OpenFile"));
213
214 QDBusUnixFileDescriptor descriptor;
215 descriptor.giveFileDescriptor(fd);
216
217 const QVariantMap options = {{QLatin1String("writable"), true}};
218
219 // FIXME parent_window_id
220 message << QString() << QVariant::fromValue(descriptor) << options;
221
222 return QDBusConnection::sessionBus().call(message);
223 }
224#else
225 Q_UNUSED(url);
226#endif
227
228 return QDBusMessage::createError(QDBusError::InternalError, qt_error_string());
229}
230
231static inline QDBusMessage xdgDesktopPortalOpenUrl(const QUrl &url)
232{
233 // DBus signature:
234 // OpenURI (IN s parent_window,
235 // IN s uri,
236 // IN a{sv} options,
237 // OUT o handle)
238 // Options:
239 // handle_token (s) - A string that will be used as the last element of the @handle.
240 // writable (b) - Whether to allow the chosen application to write to the file.
241 // This key only takes effect the uri points to a local file that is exported in the document portal,
242 // and the chosen application is sandboxed itself.
243
244 QDBusMessage message = QDBusMessage::createMethodCall(QLatin1String("org.freedesktop.portal.Desktop"),
245 QLatin1String("/org/freedesktop/portal/desktop"),
246 QLatin1String("org.freedesktop.portal.OpenURI"),
247 QLatin1String("OpenURI"));
248 // FIXME parent_window_id and handle writable option
249 message << QString() << url.toString() << QVariantMap();
250
251 return QDBusConnection::sessionBus().call(message);
252}
253
254static inline QDBusMessage xdgDesktopPortalSendEmail(const QUrl &url)
255{
256 // DBus signature:
257 // ComposeEmail (IN s parent_window,
258 // IN a{sv} options,
259 // OUT o handle)
260 // Options:
261 // address (s) - The email address to send to.
262 // subject (s) - The subject for the email.
263 // body (s) - The body for the email.
264 // attachment_fds (ah) - File descriptors for files to attach.
265
266 QUrlQuery urlQuery(url);
267 QVariantMap options;
268 options.insert(QLatin1String("address"), url.path());
269 options.insert(QLatin1String("subject"), urlQuery.queryItemValue(QLatin1String("subject")));
270 options.insert(QLatin1String("body"), urlQuery.queryItemValue(QLatin1String("body")));
271
272 // O_PATH seems to be present since Linux 2.6.39, which is not case of RHEL 6
273#ifdef O_PATH
274 QList<QDBusUnixFileDescriptor> attachments;
275 const QStringList attachmentUris = urlQuery.allQueryItemValues(QLatin1String("attachment"));
276
277 for (const QString &attachmentUri : attachmentUris) {
278 const int fd = qt_safe_open(QFile::encodeName(attachmentUri), O_PATH);
279 if (fd != -1) {
280 QDBusUnixFileDescriptor descriptor(fd);
281 attachments << descriptor;
282 qt_safe_close(fd);
283 }
284 }
285
286 options.insert(QLatin1String("attachment_fds"), QVariant::fromValue(attachments));
287#endif
288
289 QDBusMessage message = QDBusMessage::createMethodCall(QLatin1String("org.freedesktop.portal.Desktop"),
290 QLatin1String("/org/freedesktop/portal/desktop"),
291 QLatin1String("org.freedesktop.portal.Email"),
292 QLatin1String("ComposeEmail"));
293
294 // FIXME parent_window_id
295 message << QString() << options;
296
297 return QDBusConnection::sessionBus().call(message);
298}
299#endif // QT_CONFIG(dbus)
300
301QByteArray QGenericUnixServices::desktopEnvironment() const
302{
303 static const QByteArray result = detectDesktopEnvironment();
304 return result;
305}
306
307bool QGenericUnixServices::openUrl(const QUrl &url)
308{
309 if (url.scheme() == QLatin1String("mailto")) {
310#if QT_CONFIG(dbus)
311 if (checkNeedPortalSupport()) {
312 QDBusError error = xdgDesktopPortalSendEmail(url);
313 if (isPortalReturnPermanent(error))
314 return !error.isValid();
315
316 // service not running, fall back
317 }
318#endif
319 return openDocument(url);
320 }
321
322#if QT_CONFIG(dbus)
323 if (checkNeedPortalSupport()) {
324 QDBusError error = xdgDesktopPortalOpenUrl(url);
325 if (isPortalReturnPermanent(error))
326 return !error.isValid();
327 }
328#endif
329
330 if (m_webBrowser.isEmpty() && !detectWebBrowser(desktopEnvironment(), true, &m_webBrowser)) {
331 qWarning("Unable to detect a web browser to launch '%s'", qPrintable(url.toString()));
332 return false;
333 }
334 return launch(m_webBrowser, url);
335}
336
337bool QGenericUnixServices::openDocument(const QUrl &url)
338{
339#if QT_CONFIG(dbus)
340 if (checkNeedPortalSupport()) {
341 QDBusError error = xdgDesktopPortalOpenFile(url);
342 if (isPortalReturnPermanent(error))
343 return !error.isValid();
344 }
345#endif
346
347 if (m_documentLauncher.isEmpty() && !detectWebBrowser(desktopEnvironment(), false, &m_documentLauncher)) {
348 qWarning("Unable to detect a launcher for '%s'", qPrintable(url.toString()));
349 return false;
350 }
351 return launch(m_documentLauncher, url);
352}
353
354#else
355QByteArray QGenericUnixServices::desktopEnvironment() const
356{
357 return QByteArrayLiteral("UNKNOWN");
358}
359
360bool QGenericUnixServices::openUrl(const QUrl &url)
361{
362 Q_UNUSED(url);
363 qWarning("openUrl() not supported on this platform");
364 return false;
365}
366
367bool QGenericUnixServices::openDocument(const QUrl &url)
368{
369 Q_UNUSED(url);
370 qWarning("openDocument() not supported on this platform");
371 return false;
372}
373
374#endif // QT_NO_MULTIPROCESS
375
376QT_END_NAMESPACE
377