php-simple-authentication.php

 
 <?php
/**
 * A way of simple authentication for a given user or simple password.
 */

/**
 * Checks against an array of authenticated users. When a valid user is found, that user's
 * information is set as readonly properties.
 */
class Php_Simple_Authentication {

	/**
	 * Details of the authenticated user.
	 *
	 * @var string
	 */
	public readonly array $user;







	/**
	 * Constructor for the class.
	 *
	 * @param array<int, array{username: string, password: string, privs: string}> $users Preconfigured usernames and passwords.
	 */
	public function __construct( array $config ) {

		// Attempt to set the user.
		$this->set_user( $config['users'] );

	}







	/**
	 * Set the current user type based on the current authenticated user.
	 *
	 * @return void
	 */
	private function set_user( array $users ) {

		// Loop over each configured user type.
		foreach ( $users as $user ) {

			// Check if a password matches a configured user.
			if ( isset( $_GET ) && array_key_exists( 'password', $_GET ) && in_array( $_GET['password'], $user ) ) {

				// Do not store this since it is about to be set as a property of this object.
				unset( $user['password'] );

				// Set the matching user user.
				$this->user = $user;
				break;

			}
		}

		// Check if a user was found.
		if ( empty( $this->user ) ) {

			// The loop finished with no found user. Set a fallback value.
			$this->user = array();

		}
	}
}