feat: show decoded invite details (node id, address:port) in JoinDialog

Auto-decodes invite link with 400ms debounce, shows 'Node: 0x... | IP:port'

tools/chatgui/src/joindialog.cpp

@@ -76,6 +76,46 @@ JoinDialog::JoinDialog(UtunNode* node, DbManager* db, QWidget* parent)
     layout->addLayout(btnLayout);
 
     connect(m_linkEdit, &QLineEdit::returnPressed, this, &JoinDialog::onConnectClicked);
+    connect(m_linkEdit, &QLineEdit::textChanged, this, &JoinDialog::onLinkTextChanged);
+
+    m_decodeTimer = new QTimer(this);
+    m_decodeTimer->setSingleShot(true);
+    m_decodeTimer->setInterval(400);
+    connect(m_decodeTimer, &QTimer::timeout, this, [this]() {
+        QString link = m_linkEdit->text().trimmed();
+        if (link.isEmpty()) {
+            setStatus("");
+            return;
+        }
+        InviteData d = decodeInviteLink(link);
+        if (!d.error.isEmpty() || d.pubkey.size() != 32) {
+            setStatus("");
+            return;
+        }
+        uint8_t hash[32];
+        SC_SHA256_CTX ctx;
+        sc_sha256_init(&ctx);
+        sc_sha256_update(&ctx, (const uint8_t*)d.pubkey.constData(), 32);
+        sc_sha256_final(&ctx, hash);
+        uint64_t nodeId;
+        memcpy(&nodeId, hash, sizeof(nodeId));
+        nodeId &= 0x7FFFFFFFFFFFFFFFULL;
+
+        QStringList addrList;
+        for (const auto& a : d.addrs) {
+            QString addrStr;
+            if (a.family == 4 && a.address.size() == 4) {
+                const uint8_t* b = (const uint8_t*)a.address.constData();
+                addrStr = QString("%1.%2.%3.%4").arg(b[0]).arg(b[1]).arg(b[2]).arg(b[3]);
+            } else {
+                addrStr = QString("ipv6:%1").arg(a.address.toHex().constData());
+            }
+            addrList.append(QString("%1:%2").arg(addrStr).arg(a.port));
+        }
+        setStatus(QString("Node: 0x%1  |  %2")
+            .arg(nodeId, 16, 16, QLatin1Char('0'))
+            .arg(addrList.join(", ")));
+    });
 
     gui_bridge_set_connect_result_cb([](uint64_t nodeId, uint64_t channelId, int result) {
         JoinDialog* dlg = qobject_cast<JoinDialog*>(QApplication::activeModalWidget());
@@ -95,6 +135,10 @@ void JoinDialog::setStatus(const QString& text, bool isError) {
     m_statusLabel->setText(text);
 }
 
+void JoinDialog::onLinkTextChanged() {
+    m_decodeTimer->start();
+}
+
 void JoinDialog::onConnectClicked() {
     if (m_connecting) return;
     QString link = m_linkEdit->text().trimmed();

tools/chatgui/src/joindialog.h

@@ -4,6 +4,7 @@
 #include <QLineEdit>
 #include <QLabel>
 #include <QPushButton>
+#include <QTimer>
 #include <cstdint>
 
 class UtunNode;
@@ -20,6 +21,7 @@ signals:
 
 private slots:
     void onConnectClicked();
+    void onLinkTextChanged();
 
 private:
     void setStatus(const QString& text, bool isError = false);
@@ -31,6 +33,7 @@ private:
     QLabel*    m_statusLabel;
     QPushButton* m_connectBtn;
     QPushButton* m_cancelBtn;
+    QTimer*     m_decodeTimer;
     bool       m_connecting = false;
     uint64_t   m_pendingNodeId = 0;
     uint64_t   m_pendingChannelId = 0;