function init(settings,_server,storage,runtimeAPI) {
    server = _server;
    if (settings.httpAdminRoot !== false) {
        adminApp = apiUtil.createExpressApp(settings);

        var cors = require('cors');
        var corsHandler = cors({
           origin: "*",
           methods: "GET,PUT,POST,DELETE"
        });
        adminApp.use(corsHandler);

        if (settings.httpAdminMiddleware) {
            if (typeof settings.httpAdminMiddleware === "function" || Array.isArray(settings.httpAdminMiddleware)) {
                adminApp.use(settings.httpAdminMiddleware);
            }
        }

        auth.init(settings,storage);

        var maxApiRequestSize = settings.apiMaxLength || '5mb';
        adminApp.use(bodyParser.json({limit:maxApiRequestSize}));
        adminApp.use(bodyParser.urlencoded({limit:maxApiRequestSize,extended:true}));

        adminApp.get("/auth/login",auth.login,apiUtil.errorHandler);
        if (settings.adminAuth) {
            if (settings.adminAuth.type === "strategy") {
                auth.genericStrategy(adminApp,settings.adminAuth.strategy);
            } else if (settings.adminAuth.type === "credentials") {
                adminApp.use(passport.initialize());
                adminApp.post("/auth/token",
                    auth.ensureClientSecret,
                    auth.authenticateClient,
                    auth.getToken,
                    auth.errorHandler
                );
            } else if (settings.adminAuth.tokens) {
                adminApp.use(passport.initialize());
            }
            adminApp.post("/auth/revoke",auth.needsPermission(""),auth.revoke,apiUtil.errorHandler);
        }

        // Editor
        if (!settings.disableEditor) {
            editor = require("./editor");
            var editorApp = editor.init(server, settings, runtimeAPI);
            adminApp.use(editorApp);
        }

        if (settings.httpAdminCors) {
            var corsHandler = cors(settings.httpAdminCors);
            adminApp.use(corsHandler);
        }

        var adminApiApp = require("./admin").init(settings, runtimeAPI);
        adminApp.use(adminApiApp);
    } else {
        adminApp = null;
    }
}
Initialise the module.
@param  {Object}     settings   The runtime settings
@param  {HTTPServer} _server     An instance of HTTP Server
@param  {Storage}    storage    An instance of Node-RED Storage
@param  {Runtime}    runtimeAPI An instance of Node-RED Runtime
@memberof @node-red/editor-api