index.js
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'use strict';
module.exports = function (opts) {
var escapeHtml = require('escape-html');
if (!opts) {
opts = {};
}
if (!isFinite(opts.port)) {
opts.port = 443;
}
if (!opts.browsers) {
opts.browsers = 301;
}
if (!opts.apis) {
opts.apis = 'meta';
}
if (!Array.isArray(opts.paths)) {
opts.paths = [ { match: '/' } ];
}
if (!('body' in opts)) {
opts.body = "<!-- Hello Developer Person! We don't serve insecure resources around here."
+ "\n Please use HTTPS instead. -->";
}
opts.body = opts.body.replace(/{{\s+PORT\s+}}/ig, opts.port);
return function (req, res, next) {
if (req.connection.encrypted
|| 'https' === req.protocol
|| (opts.trustProxy && 'https' === req.headers['x-forwarded-proto'])
) {
next();
return;
}
var url = (req.originalUrl || req.url);
// We don't want chrome showing the "Not Secure" badge during the redirect.
var probablyBrowser = (0 === (req.headers['user-agent']||'').indexOf('Mozilla/'));
// But we don't want devs, APIs, or Bots to accidentally browse insecure.
var redirect = probablyBrowser ? opts.browsers : opts.apis;
var host = req.headers.host || '';
if (!/:\d+/.test(host) && 443 !== opts.port) {
// we are using standard port 80, but we aren't using standard port 443
host += ':80';
}
var newLocation = 'https://'
+ host.replace(/:\d+/, ':' + opts.port) + url
;
//var encodedLocation = encodeURI(newLocation);
var escapedLocation = escapeHtml(newLocation);
var decodedLocation;
try {
decodedLocation = decodeURIComponent(newLocation);
} catch(e) {
decodedLocation = newLocation; // "#/error/?error_message=" + e.toString();
}
var body = opts.body
.replace(/{{\s*HTML_URL\s*}}/ig, escapeHtml(decodedLocation))
.replace(/{{\s*URL\s*}}/ig, escapedLocation)
.replace(/{{\s*UNSAFE_URL\s*}}/ig, newLocation)
;
var metaRedirect = ''
+ '<html>\n'
+ '<head>\n'
//+ ' <style>* { background-color: white; color: white; text-decoration: none; }</style>\n'
+ ' <META http-equiv="refresh" content="0;URL=\'' + escapedLocation + '\'">\n'
+ '</head>\n'
+ '<body>\n' + body + '\n</body>\n'
+ '</html>\n'
;
var pathMatch;
opts.paths.some(function (p) {
if (!p.match) {
// ignore
} else if ('string' === typeof p.match) {
pathMatch = (url === p.match) && (p.redirect || 301);
} else {
pathMatch = p.match.test && p.match.test(url) && (p.redirect || 301);
}
if (pathMatch) {
redirect = pathMatch;
}
return pathMatch;
});
// If it's not a non-0 number (because null is 0) then 'meta' is assumed.
if (redirect && isFinite(redirect)) {
res.statusCode = redirect;
res.setHeader('Location', newLocation);
}
res.setHeader('Content-Type', 'text/html; charset=utf-8');
res.end(metaRedirect);
};
};