@apolitical/server/src/loaders/middlewares.loader.js

Node.js module to encapsulate Apolitical's express server setup

'use strict';

module.exports = ({
  bodyParser: { json, urlencoded },
  express,
  compression,
  cors,
  cookieParser,
  prerender,
  config,
}) => {
  const {
    BODY_PARSER_OPTIONS: { JSON_OPTIONS, URL_ENCODED_OPTIONS },
    CORS_OPTIONS,
    STATIC_FILES: { OPTIONS: STATIC_OPTIONS, NO_CACHE_TYPES },
  } = config.SERVER;

  return function load(app, { corsOptions, prerenderToken, staticFiles }) {
    // Load useful middlewares
    app.use(cookieParser());
    app.use(json(JSON_OPTIONS));
    app.use(urlencoded(URL_ENCODED_OPTIONS));
    app.use(cors(Object.assign({}, CORS_OPTIONS, corsOptions)));
    app.use(compression());
    if (prerenderToken) {
      app.use(prerender.set('prerenderToken', prerenderToken));
    }
    if (staticFiles) {
      const { baseUrl, folderPath } = staticFiles;
      app.use(
        baseUrl,
        express.static(
          folderPath,
          Object.assign({}, STATIC_OPTIONS, {
            setHeaders: (res, path) => {
              const mimeType = express.static.mime.lookup(path);
              if (NO_CACHE_TYPES.includes(mimeType)) {
                res.setHeader('Cache-Control', 'public, max-age=0');
              }
            },
          }),
        ),
      );
    }
  };
};