feat: load bootstrap nodes directly from JSON

This allows us to easily update the list of bootstrap nodes.

res.qrc

@@ -1,6 +1,7 @@
 <RCC>
     <qresource prefix="/conf">
         <file alias="settings.ini">res/settings.ini</file>
+        <file alias="nodes.json">res/nodes.json</file>
     </qresource>
     <qresource prefix="/font">
         <file alias="DejaVuSans.ttf">res/font/DejaVuSans.ttf</file>

src/net/bootstrapnodeupdater.cpp

@@ -1,5 +1,7 @@
 #include "bootstrapnodeupdater.h"
 
+#include <QDirIterator>
+#include <QFile>
 #include <QJsonArray>
 #include <QJsonDocument>
 #include <QJsonObject>
@@ -12,6 +14,7 @@ const QUrl NodeListAddress{"https://nodes.tox.chat/json"};
 const QLatin1Literal jsonNodeArrayName{"nodes"};
 const QLatin1Literal emptyAddress{"-"};
 const QRegularExpression ToxPkRegEx(QString("(^|\\s)[A-Fa-f0-9]{%1}($|\\s)").arg(64));
+const QLatin1Literal builtinNodesFile{":/conf/nodes.json"};
 } // namespace
 
 namespace NodeFields {
@@ -47,6 +50,29 @@ void BootstrapNodeUpdater::requestBootstrapNodes()
     nam.get(request);
 }
 
+/**
+ * @brief Loads the list of built in boostrap nodes
+ * @return List of bootstrapnodes on success, empty list on error
+ */
+QList<DhtServer> BootstrapNodeUpdater::loadDefaultBootstrapNodes()
+{
+    QFile nodesFile{builtinNodesFile};
+    if (!nodesFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        qWarning() << "Couldn't read bootstrap nodes";
+        return {};
+    }
+
+    QString nodesJson = nodesFile.readAll();
+    nodesFile.close();
+    QJsonDocument d = QJsonDocument::fromJson(nodesJson.toUtf8());
+    if (d.isNull()) {
+        qWarning() << "Failed to parse JSON document";
+        return {};
+    }
+
+    return jsonToNodeList(d);
+}
+
 void BootstrapNodeUpdater::onRequestComplete(QNetworkReply* reply)
 {
     if (reply->error() != QNetworkReply::NoError) {

src/net/bootstrapnodeupdater.h

@@ -16,6 +16,7 @@ class BootstrapNodeUpdater : public QObject
 public:
     explicit BootstrapNodeUpdater(const QNetworkProxy& proxy, QObject* parent = nullptr);
     void requestBootstrapNodes();
+    static QList<DhtServer> loadDefaultBootstrapNodes();
 
 signals:
     void availableBootstrapNodes(QList<DhtServer> nodes);

test/net/bsu_test.cpp

@@ -34,11 +34,14 @@ public:
     TestBootstrapNodesUpdater();
 private slots:
     void testOnline();
+    void testLocal();
 };
 
 TestBootstrapNodesUpdater::TestBootstrapNodesUpdater()
 {
     qRegisterMetaType<QList<DhtServer>>("QList<DhtServer>");
+    // Contains the builtin nodes list
+    Q_INIT_RESOURCE(res);
 }
 
 void TestBootstrapNodesUpdater::testOnline()
@@ -55,5 +58,11 @@ void TestBootstrapNodesUpdater::testOnline()
     QVERIFY(result.size() > 0); // some data should be returned
 }
 
+void TestBootstrapNodesUpdater::testLocal()
+{
+    QList<DhtServer> defaultNodes = BootstrapNodeUpdater::loadDefaultBootstrapNodes();
+    QVERIFY(defaultNodes.size() > 0);
+}
+
 QTEST_GUILESS_MAIN(TestBootstrapNodesUpdater)
 #include "bsu_test.moc"