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/*
* 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} = require('./env');
const express = require('express');
const compression = require('compression');
const {renderHandler} = require('./render');
const {notFoundHandler} = require('./not-found');
const {buildStaticHandler} = require('./handlers/static');
const unknownDomainRedirectHandler = require('./unknown-domain');
const healthCheckHandler = require('./health-check');
const app = express();
// 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 cspHandler = (_req, res, next) => {
// TODO(samthor): This is an unsuitable policy but included as a start.
res.setHeader(
'Content-Security-Policy-Report-Only',
"object-src 'none'; " +
"script-src 'self' 'unsafe-inline' https://www.google-analytics.com https://cdnjs.cloudflare.com https://www.gstatic.com https://www.google.com https://*.firebaseio.com;" +
"base-uri 'none'; " +
"frame-ancestors 'self'; " +
'report-uri https://csp.withgoogle.com/csp/chrome-apps-doc'
);
// nb. This is superceded by 'frame-ancestors' above, but retain while that
// policy is "Report-Only".
res.setHeader('X-Frame-Options', 'SAMEORIGIN');
next();
};
const handlers = [
cspHandler,
immutableRootHandler,
buildStaticHandler(),
healthCheckHandler,
notFoundHandler,
];
if (isGAEProd) {
// In production, ensure we're being served from the canonical domain.
handlers.unshift(unknownDomainRedirectHandler);
} else {
// In production, the GFEs do gzip compression for us. Just set up for dev
// so that audits are happy.
handlers.unshift(compression());
}
app.use(express.json());
app.use(express.urlencoded({extended: true}));
app.post('/_render', renderHandler);
app.use(...handlers);
const listener = app.listen(process.env.PORT || 8080, () => {
console.log('The server is listening at:', listener.address());
});
module.exports = app;