Scroll down to the script below, click on any sentence (including terminal blocks!) to jump to that spot in the video!
LexikJWTAuthenticationBundle. This bundle is going to make creating and
validating JSON web tokens as much fun as eating ice cream. Click to read the
documentation. And now, you guys know the drill. Copy the library name from the
composer require line and run:
composer require lexik/jwt-authentication-bundle
The latest version of
lexik/jwt-authentication-bundle requires Symfony 3.4 or higher.
composer require 'lexik/jwt-authentication-bundle:v2.4' to install this bundle for
older versions of Symfony, like the one that is used in this screencast. Or, upgrade your
While we're waiting for Jordi, I mean Composer to download that for us, let's keep
busy. Copy the new bundle line and put that into
|... lines 1 - 5|
|class AppKernel extends Kernel|
|public function registerBundles()|
|$bundles = array(|
|... lines 11 - 20|
|... lines 23 - 32|
|... lines 34 - 51|
Our first goal is to write some code that can take an array of information - like a user's username - and turn that into a JSON web token. This bundle gives us a really handy service to do that.
But before we can use it, we need to generate a public and private key. The private, or secret key, will be used to sign the JSON web tokens. And no matter what the FBI says, this must stay private: if someone else gets it, they'll be able to create new JSON web tokens with whatever information they want - like with someone else's username to gain access to their account.
Copy the first line, head to the terminal and wait for Composer to finish all its thinking. Come on Jordi! Don't worry about the error: this bundle has some required configuration that we're about to provide.
First, make a new directory to hold the keys:
Next, copy the second line to create a private key, but change its path to the
openssl genrsa -out var/jwt/private.pem -aes256 4096
This asks you for a password - give it one! It adds another layer of security in case
somebody gets your private key. I'll use
Last step: copy the final line and remove
app at the beginning and the end to point
openssl rsa -pubout -in var/jwt/private.pem -out var/jwt/public.pem
Type in the password you just set. This creates a public key. It'll be used to verify that a JWT hasn't been tampered with. It's not private, but you probably won't need to share it, unless someone else - or some other app - needs to also verify that a JWT we created is valid.
We now have a
private.pem and a
public.pem. You probably will not want to commit
these to your repository: the private key needs to stay secret. But there's good news!
You can create a key pair to use locally and then generate a totally different key
pair on production when you deploy. They don't need to be the same. Just don't change
the keys on production: that will invalidate any existing JSON web tokens that your
Ok, last step: tell the bundle about our keys. Copy the configuration from the docs
and open up
app/config/config.yml. Paste this at the bottom:
|... lines 1 - 72|
Instead of using all these fancy parameters, it's fine to set the path directly:
private_key_path: %kernel.root_dir% - that's the
app/ directory -
Do the same for the public key, with
public.pem. Set the
token_ttl to whatever
you want: I'll use 3600: this means every token will be valid for only 1 hour.
parameters.yml and add the
jwt_key_pass_phrase, which for me is
happyapi. Don't forget to add an empty setting also in
for future developers:
|... line 1|
|... lines 3 - 20|
Phew! That's it! We had to generate a public and private key, but now, life is going to be sweet. Run:
bin/console debug:container jwt
lexik_jwt_authentication.jwt_encoder. This is our new best friend for generating
JSON web tokens.