I have looked into the csurf module's wiki, but unfortunately, it appears to be blank. This particular module enhances user requests by including a csrfToken() function, however, I am unsure of how to properly utilize it.
Could someone kindly provide a code snippet along with explanations? What steps are required on the user side? And what actions should I take on the server-side?
The essential purpose of the csurf middleware is to block incoming requests that include a payload (such as body parameters) without a valid token. Here's an example of how you can implement it:
app.use(require('body-parser')());
app.use(require('cookie-parser')('YOUR SECRET GOES HERE'));
app.use(require('express-session')());
app.use(require('csurf')());
app.get('/some-form', function(req, res){
res.send('<form action="/process" method="POST">' +
'<input type="hidden" name="_csrf" value="' + req.csrfToken() + '">' +
'Favorite color: <input type="text" name="favoriteColor">' +
'<button type="submit">Submit</button>' +
'</form>');
});
app.post('/process', function(req, res){
res.send('<p>Your favorite color is "' + req.body.favoriteColor + '".');
});
If you remove or alter the req.csrfToken(), you will notice that the form stops functioning correctly.
Keep in mind that using sessions is crucial for the proper operation of csurf. To understand why csurf is necessary, refer to the Wikipedia page on cross-site request forgery (CSRF).
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