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PHP User Authentication

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Login Systems

4:53 with Alena Holligan and Brian Retterer

What good is a registration system without a way for the user to log in. We'll be using some additional packages for building a JWT and storing environmental variables.

Check out this course if you want to know more about Dependency Management with Composer

Packages

  • PHP JWT by Firebase: a simple library to encode and decode JSON Web Tokens (JWT) in PHP, conforming to RFC 7519.
  • PHP dotenv: Loads environment variables from .env to getenv(), $_ENV and $_SERVER automagically.

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    We now need a way to allow our user to log in. 0:00
    Once again, I've provided you with the form so 0:04
    that we can focus on the logic behind the login system. 0:06
    Our login system we use the related function that we use for 0:10
    hashing passwords. 0:13
    Password verify, this function will take the current password 0:15
    stored in the database, extract the salt from it and try to generate 0:19
    the same password hash again with the provided password from the form. 0:24
    It will return true or false, 0:29
    depending on if the new hash password matches the stored password hash. 0:31
    We will also be introducing you to a couple new tools that will be installed 0:36
    via Composer, PHP JWT, and php.env. 0:41
    PHP JWT is a JSON Web Token package that allows you 0:47
    to generate a job that will store in our cookie. 0:51
    Php.env is a nice package to set environment variables based on a file. 0:55
    Since we're going to need a new package for 1:01
    this system, let's install our new package through Composer. 1:03
    In your workspace go to view, show console. 1:06
    This will provide you with a prompt for your project. 1:11
    The package we're going to be using is the php-jwt by Firebase. 1:14
    So let's type in composer 1:20
    require firebase/php-jwt. 1:25
    This will install the package and update your composer.json and composer.loc files. 1:31
    We also need to require the php.env package. 1:39
    As a second way of doing this, you could open the composer.json file. 1:43
    Find the require section and 1:53
    add "vlucas/phpdotenv" : ^2.4. 1:59
    Make sure that you add a comma to separate these two packages. 2:08
    This method requires that you know the latest stable release or 2:11
    version that you want to use. 2:15
    After updating your json file go back to the console. 2:17
    And type composer update. 2:24
    We need to create a new .env file in our project. 2:30
    This is where we'll store environment variables. 2:34
    I'll go over this in just a little bit, but 2:37
    before we do that, let's create our login procedure. 2:39
    In the procedures folder, create a new file. 2:43
    Name this doLogin.php. 2:47
    Start off like the rest of the procedures with the bootstrap file. 2:56
    Now, let's get the user by the email address that was supplied. 3:12
    If the user array that is returned is empty, then we need to redirect back to 3:31
    the login screen since the user with that email does not exist. 3:36
    If (empty($user) 3:42
    redirect('/login. 3:48
    Next, we need to check to see if the passwords match. 3:54
    Since the password is hashed, 3:58
    we cannot just compare what was provided to us with what is in the database. 4:00
    We can, however use the password_verify function to do so. 4:05
    If (!password_verify(request() 4:14
    =>get('password'), and 4:22
    then the user password. 4:28
    Again we'll redirect to the login page. 4:41
    If we get past both these checks the user can log in. 4:47
    So let's create a jot to store in our cookie. 4:51

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