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unknown-domain.js
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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.
*/
// Included for types only.
// eslint-disable-next-line no-unused-vars
const express = require('express');
const {siteDomain} = require('./env');
/**
* We don't support other serving locations other than "developer.chrome.com".
*
* This is a stop-gap until Google's infrastructure can be updated so that it
* no longer serves the underlying App Engine instance on other locations.
*
* (Note: this doesn't run during local dev, only when deployed to App Engine).
*
* @type {express.RequestHandler}
*/
const domainRedirectHandler = (req, res, next) => {
if (req.hostname === siteDomain) {
return next();
}
// Ignore the appspot.com suffix, in case we want to hit the appid directly.
if (req.hostname.endsWith('.appspot.com')) {
return next();
}
// Don't forward POST or anything odd.
if (!['GET', 'HEAD'].includes(req.method)) {
res.sendStatus(405);
return res.end();
}
let url = req.url;
// Special-case "code.google.com", which has a "/chrome/" prefix.
if (req.hostname === 'code.google.com') {
const stripPrefix = '/chrome';
// We don't see requests for a URL without a slash, they all arrive with one.
if (url.startsWith(stripPrefix + '/')) {
url = url.substr(stripPrefix.length);
}
}
const u = new URL(url, `https://${siteDomain}`);
return res.redirect(u.toString(), 301);
};
module.exports = domainRedirectHandler;