summaryrefslogtreecommitdiffstats
path: root/src/dbus/qdbusmisc.cpp
blob: 46cf857751e47b5a02c3cced4725a5e96ee9ee4a (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
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtDBus module 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 <string.h>

#ifndef QT_BOOTSTRAPPED
#include <QtCore/qcoreapplication.h>
#include <QtCore/qvariant.h>
#include <QtCore/qmetaobject.h>

#include "qdbusutil_p.h"
#include "qdbusconnection_p.h"
#include "qdbusabstractadaptor_p.h" // for QCLASSINFO_DBUS_*
#endif
#include <QtCore/qvector.h>
#include "qdbusmetatype_p.h"

#ifndef QT_NO_DBUS

QT_BEGIN_NAMESPACE

bool qDBusCheckAsyncTag(const char *tag)
{
    static const char noReplyTag[] = "Q_NOREPLY";
    if (!tag || !*tag)
        return false;

    const char *p = strstr(tag, noReplyTag);
    if (p != nullptr &&
        (p == tag || *(p-1) == ' ') &&
        (p[sizeof noReplyTag - 1] == '\0' || p[sizeof noReplyTag - 1] == ' '))
        return true;

    return false;
}

#ifndef QT_BOOTSTRAPPED

QString qDBusInterfaceFromMetaObject(const QMetaObject *mo)
{
    QString interface;

    int idx = mo->indexOfClassInfo(QCLASSINFO_DBUS_INTERFACE);
    if (idx >= mo->classInfoOffset()) {
        interface = QLatin1String(mo->classInfo(idx).value());
    } else {
        interface = QLatin1String(mo->className());
        interface.replace(QLatin1String("::"), QLatin1String("."));

        if (interface.startsWith(QLatin1String("QDBus"))) {
            interface.prepend(QLatin1String("org.qtproject.QtDBus."));
        } else if (interface.startsWith(QLatin1Char('Q')) &&
                   interface.length() >= 2 && interface.at(1).isUpper()) {
            // assume it's Qt
            interface.prepend(QLatin1String("org.qtproject.Qt."));
        } else if (!QCoreApplication::instance()||
                   QCoreApplication::instance()->applicationName().isEmpty()) {
            interface.prepend(QLatin1String("local."));
         } else {
            interface.prepend(QLatin1Char('.')).prepend(QCoreApplication::instance()->applicationName());
            const QString organizationDomain = QCoreApplication::instance()->organizationDomain();
            const auto domainName = organizationDomain.splitRef(QLatin1Char('.'), Qt::SkipEmptyParts);
            if (domainName.isEmpty()) {
                 interface.prepend(QLatin1String("local."));
            } else {
                QString composedDomain;
                // + 1 for additional dot, e.g. organizationDomain equals "example.com",
                // then composedDomain will be equal "com.example."
                composedDomain.reserve(organizationDomain.size() + 1);
                for (auto it = domainName.rbegin(), end = domainName.rend(); it != end; ++it)
                    composedDomain += *it + QLatin1Char('.');

                interface.prepend(composedDomain);
            }
         }
     }

    return interface;
}

bool qDBusInterfaceInObject(QObject *obj, const QString &interface_name)
{
    const QMetaObject *mo = obj->metaObject();
    for ( ; mo != &QObject::staticMetaObject; mo = mo->superClass())
        if (interface_name == qDBusInterfaceFromMetaObject(mo))
            return true;
    return false;
}

// calculates the metatypes for the method
// the slot must have the parameters in the following form:
//  - zero or more value or const-ref parameters of any kind
//  - zero or one const ref of QDBusMessage
//  - zero or more non-const ref parameters
// No parameter may be a template.
// this function returns -1 if the parameters don't match the above form
// this function returns the number of *input* parameters, including the QDBusMessage one if any
// this function does not check the return type, so metaTypes[0] is always 0 and always present
// metaTypes.count() >= retval + 1 in all cases
//
// sig must be the normalised signature for the method
int qDBusParametersForMethod(const QMetaMethod &mm, QVector<int> &metaTypes, QString &errorMsg)
{
    return qDBusParametersForMethod(mm.parameterTypes(), metaTypes, errorMsg);
}

#endif // QT_BOOTSTRAPPED

int qDBusParametersForMethod(const QList<QByteArray> &parameterTypes, QVector<int>& metaTypes, QString &errorMsg)
{
    QDBusMetaTypeId::init();
    metaTypes.clear();

    metaTypes.append(0);        // return type
    int inputCount = 0;
    bool seenMessage = false;
    QList<QByteArray>::ConstIterator it = parameterTypes.constBegin();
    QList<QByteArray>::ConstIterator end = parameterTypes.constEnd();
    for ( ; it != end; ++it) {
        const QByteArray &type = *it;
        if (type.endsWith('*')) {
            errorMsg = QLatin1String("Pointers are not supported: ") + QLatin1String(type);
            return -1;
        }

        if (type.endsWith('&')) {
            QByteArray basictype = type;
            basictype.truncate(type.length() - 1);

            int id = QMetaType::type(basictype);
            if (id == 0) {
                errorMsg = QLatin1String("Unregistered output type in parameter list: ") + QLatin1String(type);
                return -1;
            } else if (QDBusMetaType::typeToSignature(id) == nullptr)
                return -1;

            metaTypes.append( id );
            seenMessage = true; // it cannot appear anymore anyways
            continue;
        }

        if (seenMessage) {      // && !type.endsWith('&')
            errorMsg = QLatin1String("Invalid method, non-output parameters after message or after output parameters: ") + QLatin1String(type);
            return -1;          // not allowed
        }

        int id = QMetaType::type(type);
#ifdef QT_BOOTSTRAPPED
        // in bootstrap mode QDBusMessage isn't included, thus we need to resolve it manually here
        if (type == "QDBusMessage") {
            id = QDBusMetaTypeId::message();
        }
#endif

        if (id == QMetaType::UnknownType) {
            errorMsg = QLatin1String("Unregistered input type in parameter list: ") + QLatin1String(type);
            return -1;
        }

        if (id == QDBusMetaTypeId::message())
            seenMessage = true;
        else if (QDBusMetaType::typeToSignature(id) == nullptr) {
            errorMsg = QLatin1String("Type not registered with QtDBus in parameter list: ") + QLatin1String(type);
            return -1;
        }

        metaTypes.append(id);
        ++inputCount;
    }

    return inputCount;
}

QT_END_NAMESPACE

#endif // QT_NO_DBUS