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1+/*
2+ * Copyright (C) 2019 UBports Foundation
3+ * Author(s): Marius Gripsgard <marius@ubports.com>
4+ *
5+ * This program is free software; you can redistribute it and/or modify
6+ * it under the terms of the GNU General Public License as published by
7+ * the Free Software Foundation; version 3.
8+ *
9+ * This program is distributed in the hope that it will be useful,
10+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
11+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12+ * GNU General Public License for more details.
13+ *
14+ * You should have received a copy of the GNU General Public License
15+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
16+ */
17+
18+#include "xdgwatcher.h"
19+
20+#include <QDebug>
21+#include <QDir>
22+#include <QFile>
23+#include <QStandardPaths>
24+#include <QTextStream>
25+
26+XdgWatcher::XdgWatcher(QObject* parent)
27+ : QObject(parent),
28+ m_watcher(new QFileSystemWatcher(this))
29+{
30+ connect(m_watcher, &QFileSystemWatcher::directoryChanged, this, &XdgWatcher::onDirectoryChanged);
31+ connect(m_watcher, &QFileSystemWatcher::fileChanged, this, &XdgWatcher::onFileChanged);
32+
33+ const auto paths = QStandardPaths::standardLocations(QStandardPaths::ApplicationsLocation);
34+ for (const auto &path: paths) {
35+ const auto qdir = QDir(path);
36+ if (!qdir.exists()) {
37+ continue;
38+ }
39+
40+ // Add the path itself to watch for newly added apps
41+ m_watcher->addPath(path);
42+
43+ // Add watcher for eatch app to watch for changes
44+ const auto files = qdir.entryInfoList(QDir::Files);
45+ for (const auto &file: files) {
46+ if (file.suffix() == "desktop") {
47+ const auto path = file.absoluteFilePath();
48+ m_watcher->addPath(path);
49+ m_registry.insert(path, getAppId(file));
50+ }
51+ }
52+ }
53+}
54+
55+// "Ubuntu style" appID is filename without versionNumber after last "_"
56+const QString XdgWatcher::stripAppIdVersion(const QString rawAppID) const {
57+ auto appIdComponents = rawAppID.split("_");
58+ appIdComponents.removeLast();
59+ return appIdComponents.join("_");
60+}
61+
62+// Standard appID see:
63+// https://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#desktop-file-id
64+const QString XdgWatcher::toStandardAppId(const QFileInfo fileInfo) const {
65+ const auto paths = QStandardPaths::standardLocations(QStandardPaths::ApplicationsLocation);
66+ for (const auto &path: paths) {
67+ if (fileInfo.absolutePath() == path) {
68+ break;
69+ }
70+ if (fileInfo.absolutePath().contains(path)) {
71+ auto fileStr = fileInfo.absoluteFilePath();
72+ fileStr.replace(path, "");
73+ fileStr.replace("/", "-");
74+ fileStr.replace(".desktop", "");
75+ return fileStr;
76+ }
77+ }
78+ return fileInfo.completeBaseName();
79+}
80+
81+const QString XdgWatcher::getAppId(const QFileInfo fileInfo) const {
82+ // We need to open the file to check if its and Ual application
83+ // as we cant just rely on the app name as "normal" apps can also
84+ // contain 3 _ causing us to belive its an ubuntu app
85+ // Example kde_org_kate would become kde_org
86+ QFile qFile(fileInfo.absoluteFilePath());
87+ qFile.open(QIODevice::ReadOnly);
88+ QTextStream fileStream(&qFile);
89+ QString line;
90+ while (fileStream.readLineInto(&line)) {
91+ if (line.startsWith("X-Ubuntu-Application-ID=")) {
92+ auto rawAppID = line.replace("X-Ubuntu-Application-ID=", "");
93+ qFile.close();
94+ return stripAppIdVersion(rawAppID);
95+ }
96+ }
97+ qFile.close();
98+
99+ // If it's not an "Ubuntu" appID, we follow freedesktop standard
100+ return toStandardAppId(fileInfo);
101+}
102+
103+// Watch for newly added apps
104+void XdgWatcher::onDirectoryChanged(const QString &path) {
105+ const auto files = QDir(path).entryInfoList(QDir::Files);
106+ const auto watchedFiles = m_watcher->files();
107+ for (const auto &file: files) {
108+ const auto appPath = file.absoluteFilePath();
109+ if (file.suffix() == "desktop" && !watchedFiles.contains(appPath)) {
110+ m_watcher->addPath(appPath);
111+
112+ const auto appId = getAppId(file);
113+ m_registry.insert(appPath, appId);
114+ Q_EMIT appAdded(appId);
115+ }
116+ }
117+}
118+
119+void XdgWatcher::onFileChanged(const QString &path) {
120+ QFileInfo file(path);
121+ if (file.exists()) {
122+ // The file exists, this must be an modify event
123+ Q_EMIT appInfoChanged(m_registry.value(path));
124+ } else {
125+ // File does not exist, assume this is an remove event.
126+ // onDirectoryChanged will handle rename event
127+ Q_EMIT appRemoved(m_registry.take(path));
128+ }
129+}