87 lines
2.5 KiB
Markdown
87 lines
2.5 KiB
Markdown
# redirect-https
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Redirect from HTTP to HTTPS using meta redirects
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See <https://coolaj86.com/articles/secure-your-redirects/>
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## Installation and Usage
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```bash
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npm install --save redirect-https
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```
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```js
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'use strict';
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var express = require('express');
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var app = express();
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app.use('/', require('redirect-https')({
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body: '<!-- Hello Mr Developer! Please use HTTPS instead -->'
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}));
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module.exports = app;
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```
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## Options
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```
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{ port: 443 // defaults to 443
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, body: '' // defaults to an html comment to use https
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, trustProxy: true // useful if you haven't set this option in express
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}
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```
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* This module will call `next()` if the connection is already tls / https.
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* If `trustProxy` is true, and `X-Forward-Proto` is https, `next()` will be called.
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* If you use `{{URL}}` in the body text it will be replaced with a URI encoded and HTML escaped url (it'll look just like it is)
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* If you use `{{HTML_URL}}` in the body text it will be replaced with a URI decoded and HTML escaped url (it'll look just like it would in Chrome's URL bar)
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## Demo
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```javascript
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'use strict';
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var http = require('http');
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var server = http.createServer();
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var securePort = process.argv[2] || 8443;
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var insecurePort = process.argv[3] || 8080;
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server.on('request', require('redirect-https')({
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port: securePort
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, body: '<!-- Hello! Please use HTTPS instead -->'
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, trustProxy: true // default is false
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}));
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server.listen(insecurePort, function () {
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console.log('Listening on http://localhost.daplie.com:' + server.address().port);
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});
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```
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# Why meta redirects?
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When something is broken (i.e. insecure), you don't want it to kinda work, you want developers to notice.
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Using a meta redirect will break requests from `curl` and api calls from a programming language, but still have all the SEO and speed benefits of a normal `301`.
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```html
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<html><head>
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<meta http-equiv="refresh" content="0;URL='https://example.com/foo'" />
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</head><body>
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<!-- Hello Mr. Developer! Please use https instead. Thank you! -->
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</html>
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```
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# Other strategies
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If your application is properly separated between static assets and api, then it would probably be more beneficial to return a 200 OK with an error message inside
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# Security
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The incoming URL is already URI encoded by the browser but, just in case, I run an html escape on it
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so that no malicious links of this sort will yield unexpected behavior:
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* `http://localhost.daplie.com:8080/"><script>alert('hi')</script>`
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* `http://localhost.daplie.com:8080/';URL=http://example.com`
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* `http://localhost.daplie.com:8080/;URL=http://example.com`
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