/*

* Copyright 2020 Google LLC

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* https://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

const isGAEProd = Boolean(process.env.GAE_APPLICATION);

const express = require('express');

const compression = require('compression');

const {notFoundHandler} = require('./not-found');

const {buildRedirectHandler} = require('./redirect');

const pluralDomainRedirectHandler = require('./plural-domain');

const app = express();

// The site serves from both roots. We pass this to our redirects handler to

// see whether redirects will be successful.

const staticPaths = ['dist', 'dist/en'];

const redirectHandler = buildRedirectHandler('redirects.yaml', staticPaths);

// If we see content from /fonts/, then cache it forever.

// If this ends up 404'ing, we invalidate the Cache-Control header in notFoundHandler.

const immutableRootMatch = /^\/fonts\//;

const immutableRootHandler = (req, res, next) => {

if (immutableRootMatch.test(req.url)) {

res.setHeader('Cache-Control', 'max-age=31536000,immutable');

}

next();

};

const handlers = [

pluralDomainRedirectHandler,

immutableRootHandler,

...staticPaths.map(staticPath => express.static(staticPath)),

redirectHandler,

notFoundHandler,

];

if (!isGAEProd) {

handlers.unshift(compression());

}

app.use(...handlers);

// Direct all requests to the static dir

const listener = app.listen(process.env.PORT || 8080, () => {

// eslint-disable-next-line

console.log('The server is listening on port ' + listener.address().port);

});