nicotine-less/vnc-clipboard-bridge.js

// VNC → Browser clipboard sync only (one-way)
(function() {
    'use strict';

    console.log('🔌 Clipboard sync initializing (VNC → Browser only)...');

    const clipboardAvailable = navigator.clipboard && window.isSecureContext;

    if (!clipboardAvailable) {
        console.warn('⚠️ Clipboard API not available - requires HTTPS or localhost');
        return;
    }

    console.log('✓ Clipboard API available (HTTPS detected)');

    let lastPanelClipboard = '';

    // Wait for clipboard panel to be available
    function waitForPanel(callback) {
        const panel = document.getElementById('noVNC_clipboard_text');
        if (panel) {
            console.log('✓ Found noVNC clipboard panel');
            callback(panel);
        } else {
            setTimeout(() => waitForPanel(callback), 100);
        }
    }

    waitForPanel(function(clipboardPanel) {
        console.log('✓ Setting up VNC → Browser clipboard sync');

        // Sync VNC clipboard to browser
        function syncVNCToBrowser() {
            const text = clipboardPanel.value;
            if (text && text !== lastPanelClipboard) {
                lastPanelClipboard = text;

                console.log('📋 VNC → Browser: ' + text.substring(0, 50) + (text.length > 50 ? '... (' + text.length + ' chars)' : ''));

                navigator.clipboard.writeText(text).then(() => {
                    console.log('✓ Synced to system clipboard');
                }).catch(err => {
                    console.error('✗ Failed to write to clipboard:', err);
                });
            }
        }

        // Monitor changes to the clipboard panel
        const observer = new MutationObserver(syncVNCToBrowser);
        clipboardPanel.addEventListener('input', syncVNCToBrowser);
        clipboardPanel.addEventListener('change', syncVNCToBrowser);

        // Poll the panel periodically as fallback
        setInterval(syncVNCToBrowser, 300);

        observer.observe(clipboardPanel, {
            attributes: true,
            childList: true,
            characterData: true,
            subtree: true
        });

        console.log('✓ VNC → Browser clipboard sync ACTIVE');
    });
})();