- Using Session Variables to Customize Content 6:33
- Adding a Log Out Route 2:00
- Review: Custom Content 3 questions
- Understanding Express Middleware 3:31
- Writing Custom Middleware 5:48
- Writing More Middleware 3:27
- Using MongoDB as a Session Store 4:48
- Next Steps 3:42
- Review: User Authentication With Express and Mongo 5 questions
Preview
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Writing More Middleware
3:27Add a simple piece of middleware to password protect any page on a site.
I've already taught you the basics
of creating middleware.
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So I'll go pretty quickly in this video.
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Remember, we created an index.js
file in the middleware directory.
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I'll add a new function
called requiresLogin here.
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I'll use a conditional statement
to check for a session and
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a userId on that session.
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And if they're both there,
then the user is logged in.
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I'll exit the function by calling
the next piece of middleware.
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If they aren't logged in,
we'll create an error that lets
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the user know that they must be
logged in to view this page.
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We'll provide a 401 status,
meaning unauthorized, and
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we will return this to
the error handling middleware.
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And finally.
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I'll export this function.
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I'll make sure to save it.
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And now we can add this
middleware to any of our routes.
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Let me show you how this new piece of
middleware makes it easy to password
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protect any route in your application.
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Just for fun,
I'll password protect the about page.
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If I go to the index.js file
in the Routes directory,
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I only need to add Mid.requiresLogin
to the about route.
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This will call this piece of
middleware any time someone visits that
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particular route.
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Remember in the last video we already
required the middleware file.
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So the new requiresLogin method
is immediately available to us.
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Let me check this out.
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I'll save this file and
open my browser and
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make sure I'm logged out and
then I'll click on the About link.
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Hey, access denied.
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That's what we're after.
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I'll login and see what happens.
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There is the page, I have access.
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Okay, that's pretty silly, anyone
should be able to see the About page.
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Let's go back to our route,
and delete that code.
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Instead let's add this
to the profile route.
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Check out this bit of code here.
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It's basically the same as
our new piece of middleware,
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no user ID on the session object
means you're not authorized.
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However we don't need it.
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We can delete it and replace it
with our new middleware function.
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Thanks to this little bit of middleware
programming it's really easy to lock down
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any routes that require authentication.
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Simply add the requires login function to
that route and it's password protected.
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Let me show you in the web browser.
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If I log out my profile's off limits.
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I log in and there's my profile.
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This middleware makes the code for
our route simpler and
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moves functionality that's shared between
routes into a separate file and function.
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This is really useful and
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a great example of don't repeat
yourself or DRY programming.
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Now we're almost done with this course but
before we finish let me show you a simple
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way to add a production ready method for
storing session data.
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It's a method that won't bring your
site down when thousands of users
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log in simultaneously.
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