README

FyreMiddleware is a free, open-source middleware library for PHP.

Table Of Contents

• Installation
• Basic Usage
• Methods
• Middleware Queues
  • Middleware
• Request Handlers

Installation

Using Composer

composer require fyre/middleware

In PHP:

use Fyre\Middleware\MiddlewareRegistry;

Basic Usage

• $container is a Container.

$middlewareRegistry = new MiddlewareRegistry($container);

It is recommended to bind the MiddlewareRegistry to the Container as a singleton.

$container->singleton(MiddlewareRegistry::class);

Any dependencies will be injected automatically when loading from the Container.

$middlewareRegistry = $container->use(MiddlewareRegistry::class);

Methods

Clear

Clear all aliases and middleware.

$middlewareRegistry->clear();

Map

Map an alias to middleware.

• $alias is a string representing the middleware alias.
• $middleware is a string representing the Middleware class name, or a closure that returns an instance of a Middleware class.
• $arguments is an array containing additional arguments for creating the Middleware, and will default to [].

$middlewareRegistry->map($alias, $middleware, $arguments);

Resolve

Resolve Middleware.

• $middleware is a Middleware class instance, class name, alias or Closure.

$resolvedMiddleware = $middlewareRegistry->resolve($middleware);

You can pass additional arguments to the handle method of the Middleware by appending a colon followed by a comma-separated list of arguments to the string.

$middlewareRegistry->resolve('alias:arg1,arg2');

Middleware dependencies will be resolved automatically from the Container.

Use

Load a shared Middleware instance.

• $alias is a string representing the middleware alias.

$middleware = $middlewareRegistry->use($alias);

Middleware dependencies will be resolved automatically from the Container.

Middleware Queues

use Fyre\Middleware\MiddlewareQueue;

• $middlewares is an array containing the Middleware.

$queue = new MiddlewareQueue($middlewares);

Add

Add Middleware.

• $middleware is a Middleware class instance, class name name, alias or Closure.

$queue->add($middleware);

Count

Get the Middleware count.

$count = $queue->count();

Current

Get the Middleware at the current index.

$middleware = $queue->current();

Insert At

Insert Middleware at a specified index.

• $index is a number representing the index.
• $middleware is a Middleware class instance, class name name, alias or Closure.

$queue->insertAt($index, $middleware);

Key

Get the current index.

$key = $queue->key();

Next

Progress the index.

$queue->next();

Prepend

Prepend Middleware.

• $middleware is a Middleware class instance, class name name, alias or Closure.

$queue->prepend($middleware);

Rewind

Reset the index.

$queue->rewind();

Valid

Determine whether the current index is valid.

$valid = $queue->valid();

Middleware

Custom middleware can be created by extending \Fyre\Middleware\Middleware, ensuring all below methods are implemented.

Process

Process a ServerRequest.

• $request is a ServerRequest.
• $handler is a RequestHandler.

$response = $middleware->process($request, $handler);

This method should call the handle method of the $handler with the $request, to handle the next middleware in the queue, then return the ClientResponse.

Closures

You can also provide custom middleware as a simple Closure.

$middleware = function(ServerRequest $request, RequestHandler $handler): ClientResponse {
    return $handler->handle($request);
};

Request Handlers

use Fyre\Middleware\RequestHandler;

• $container is a Container.
• $middlewareRegistry is a MiddlewareRegistry.
• $queue is a MiddlewareQueue.
• $initialResponse is a ClientResponse to be used as the initial response, and will default to null.

$handler = new RequestHandler($container, $middlewareRegistry, $queue, $initialResponse);

Any dependencies will be injected automatically when loading from the Container.

$handler = $container->use(RequestHandler::class, 'queue' => $queue);

If the $initialResponse is set to null, a new ClientResponse will be created.

Handle

Handle the next middleware in the queue.

• $request is a ServerRequest.

$response = $handler->handle($request);

This method will return a ClientResponse.

The provided $request will be automatically set as the ServerRequest instance in the Container.