We enhance the express-handlebars server-side view engine by leveraging the secure-handlebars for defending against Cross-Site Scripting (XSS). Hence, web applications can be automatically secured by contextual output escaping.
express-handlebars with express-secure-handlebars (i.e., to update those require() calls as well as the dependency in your package.json). The nitty-gritties of filter choices and integrations are all automated!For more details, kindly refer to the introductions to secure-handlebars and xss-filters.
Quick Start InstallationUsagenpm install express-secure-handlebars --save
Simply replace express-handlebars with the express-secure-handlebars package in all require()!
Based on the basic example of ExpressHandlebars, here we show an example app that can be secured only with our package.
views/profile.handlebars:
Given that there is a very typical handlebars template file written like so to incorporate user inputs. The enhanced package can secure the web application by automatically applying context-sensitive output filters, which otherwise is still subject to XSS attacks if using the default escaping approach (e.g., when url is javascript:alert(1) or onclick=alert(1)).
<h1>Example App: {{title}}</h1>
...
<div>User-provided URL: <a href="{{url}}">{{url}}</a></div>
...
views/layouts/main.handlebars:
Same as the Handlebars original example, this file serves as the HTML page wrapper which can be reused for the different views of the app. {{{body}}} is used as a placeholder for where the main content should be rendered.
<!DOCTYPEÂ html>
<html>
<head><meta charset="utf-8"><title>{{title}}</title></head>
<body>
    {{{body}}}
</body>
</html>
app.js:
A super simple Express app that registers the Handlebars view engine.
Development Known Limitations & Issuesvar express = require('express'),
    exphbs  = require('express-secure-handlebars');
Â
var app = express(),
    hbs = exphbs.create({  });
Â
app.engine('handlebars', hbs.engine);
app.set('view engine', 'handlebars');
Â
app.use('/profile', function (req, res) {
    res.render('profile', {
        title:  'User Profile',
        url:    req.query.url   Â
    });
});
Â
app.listen(3000);
Please refer to the section documented in secure-handlebars.
Warnings and WorkaroundsPlease refer to the section documented in secure-handlebars.
How to testApply your changes to files in src/, and then run the tests.
LicenseThis software is free to use under the Yahoo Inc. BSD license. See the LICENSE file for license text and copyright information.
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