README

Session handling middleware based on zend-session for use in zend expressive 3 applications.

PSR-15 Support

This version supports PSR-15 instead of http-interop/http-middleware interfaces, as currently implemented by zend expressive 3. For use with older versions of zend expressive, please refer to version 0.1.9.

Requirements

PHP 7.1 or above
zendframework/zend-session

Installation

Install the latest version with composer. For information on how to get composer or how to use it, please refer to getcomposer.org.

$ composer require dwendrich/expressive-session-middleware

If during installation you are prompted to inject Zend\Session\ConfigProvider into your configuration, you can simply ignore and continue without it. All relevant configuration is part of SessionMiddleware\ConfigProvider.

As part of a zend-expressive application add SessionMiddleware\ConfigProvider::class to config/config.php:

$aggregator = new ConfigAggregator([
 
    // enable SessionMiddleware
    SessionMiddleware\ConfigProvider::class,
    
    // ... other stuff goes here 
 
    // Load application config in a pre-defined order in such a way that local settings
    // overwrite global settings. (Loaded as first to last):
    //   - `global.php`
    //   - `*.global.php`
    //   - `local.php`
    //   - `*.local.php`
    new PhpFileProvider('config/autoload/{{,*.}global,{,*.}local}.php'),
 
    // Load development config if it exists
    new PhpFileProvider('config/development.config.php'),
], $cacheConfig['config_cache_path']);

There are two ways of integrating the session middleware into your application.

1. Add the middleware to the programmatic middlewarepipeline

You can add the middleware to the file config/pipeline.php:

// Register session handling middleware
$app->pipe(SessionMiddleware::class);
 
// Register the routing middleware in the middleware pipeline
$app->pipe(\Zend\Expressive\Router\Middleware\RouteMiddleware::class);
$app->pipe(ImplicitHeadMiddleware::class);
$app->pipe(ImplicitOptionsMiddleware::class);
$app->pipe(UrlHelperMiddleware::class);

Depending on which middleware should get access to the session, you should prepend SessionMiddleware in the pipeline. Commonly before registering the routing middleware is a good way to go.

This way the middleware is invoked on every request to your application. Since session handling may produce some overhead, which isn't always needed, there is an alternative:

2. Add the middleware to a specific route

Add a route definition to either config/routes.php or a RouteDelegator as part of your application:

$app->route(
    '/path-to-my-action',
    [
        SessionMiddleware::class,
        MyApp\Action\MyAction::class
    ],
    ['GET'],
    'path-to-my-action'
);

This way session handling is bound to a specific path in your application where it may be needed.

For further information on programmatic pipelines and routing in zend expressive please refer to the documentation.

Basic usage

Once the session middleware is invoked it will start the session and adds the session manager object as attribute to the current request. Any middleware which processes this request subsequently, can detect that session handling is started by testing against the request attribute:

/**
 * Process an incoming server request and return a response, optionally delegating
 * to the next middleware component to create the response.
 *
 * @param ServerRequestInterface $request
 * @param DelegateInterface $delegate
 *
 * @return ResponseInterface
 */
public function process(ServerRequestInterface $request, DelegateInterface $delegate) : ResponseInterface
{
    $sessionManager = $request->getAttribute(SessionMiddleware::SESSION_ATTRIBUTE, false);
    
    if ($sessionManager) {
        // sessionManager is present and can be used
    }
    
    // further request processing goes here...
}

Storing and retrieving session data

Zend session component uses Container objects to access and store session data. For information on this concept please refer to the documentation.

Following is a simple example on how to use a Container:

use Zend\Session\Container;
 
$container = Container('my_namespace');
 
// save 'foo' into the `item` key
$container->item = 'foo';

In another part of the application you may want to access this data:

use Zend\Session\Container;
 
$container = Container('my_namespace');
 
// read the content from the `item` key
$foo = $container->item;

Configuration

The session can be configured by adding a session.global.php to your config/autoload path, for example. You can use session.global.php.dist file (see session.global.php.dist) as template.

return [
    'session' => [
        'config' => [
            'options' => [
                'name' => 'my_special_session_name',
                'use_cookies' => true,
                'cookie_secure' => false,
            ],
        ],
    ],
];

For possible configuration options please refer to the documentation of zend-session component.

You can override the session configuration instance with any instance or class implementing Zend\Session\Config\ConfigInterface. Simply specify it in session configuration:

return [
    'session' => [
        'class' => Zend\Session\Config\StandardConfig::class,
        'options' => [
            'name' => 'my_app',
        ],
    ],
];

For using a certain session storage adapter you can override it in the config, as well. Therefore it has to implement Zend\Session\Storage\StorageInterface:

return [
    'session' => [
        'storage' => new MyApp\Session\StorageAdapter::class,
    ],
];

To add validators to the session manager, you cann define them in the config, too, for example:

return [
    'session' => [
        'validators' => [
            Session\Validator\RemoteAddr::class,
            Session\Validator\HttpUserAgent::class,
        ],
    ],
];

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