An install script. Barely tested, and bare minimum for now.

To-do:
- prompt for guest username, with default
- prompt for ftelnet enable/disable (and implement enable/disable)
- prompt for ftelnet splash .ans if enabled
- add WS/WSS services if missing, and if ftelnet enabled
- nuke old websocket telnet/rlogin proxies if configured
- copy web/pages/examples/* to web/pages/ (once pages has been moved out of docroot)
- likewise for web/sidebar/examples/*
- test for download/extract/ini-update success before proceeding to next step
- provide URL/info re: further config instructions upon exit

mods/webv4-installer.js

+load('http.js');
+
+function download(url, target) {
+	const http = new HTTPRequest();
+	const zip = http.Get(url);
+	const f = new File(target);
+	f.open('wb');
+	f.write(zip);
+	f.close();
+}
+
+function extract(file, target) {
+	if (!file_exists(install_dir)) mkdir(install_dir);
+	system.exec(system.exec_dir + 'unzip -u ' + download_target + ' -d ' + install_dir);
+}
+
+function update_sbbs_ini(root_directory, error_directory) {
+	file_backup(system.ctrl_dir + 'sbbs.ini');
+	const f = new File(system.ctrl_dir + 'sbbs.ini');
+	f.open('r+');
+	f.iniSetValue('Web', 'RootDirectory', root_directory);
+	f.iniSetValue('Web', 'ErrorDirectory', error_directory);
+	f.close();
+}
+
+function update_modopts_ini(modopts) {
+	file_backup(system.ctrl_dir + 'modopts.ini');
+	const f = new File(system.ctrl_dir + 'modopts.ini');
+	f.open('r+');
+	f.iniSetObject('web', modopts);
+	f.close();
+}
+
+const zip_url = 'https://codeload.github.com/echicken/synchronet-web-v4/zip/master';
+const download_target = system.temp_dir + 'webv4.zip';
+const extract_dir = fullpath(system.exec_dir + '../web');
+const install_dir = fullpath(extract_dir + '/synchronet-web-v4-master');
+const root_directory = fullpath(system.exec_dir + '../web/synchronet-web-v4-master/root');
+const error_directory = fullpath(root_directory + '/errors');
+const modopts_web = {
+	guest : 'Guest',
+	timeout : 43200,
+	inactivity : 900,
+	user_registration : true,
+	minimum_password_length : 6,
+	maximum_telegram_length : 800,
+	web_directory : install_dir,
+	ftelnet_splash : '../text/synch.ans',
+	keyboard_navigation : false,
+	vote_functions : true,
+	refresh_interval : 60000,
+	xtrn_blacklist : 'scfg,oneliner',
+	layout_sidebar_off : false,
+	layout_sidebar_left : false,
+	layout_full_width : false,
+	forum_extended_ascii : false,
+	max_messages : 0
+};
+
+download(zip_url, download_target);
+extract(download_target, extract_dir);
+update_sbbs_ini(root_directory, error_directory);
+update_modopts_ini(modopts_web);