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Example code of activecollab/middlewarestack

Informations about the package middlewarestack

Middleware Stack

Build Status

This package lets you build a stack of middlewares and run requests through them to their coresponding responses. Stack is Last In First Out stack (LIFO), meaning that middlewares that are added later are considered to be "outter" middlewares, and they are executed first.

Example:

This example shows a simple authorization check prior to request being sent further down to routing, controller, and result encoding.

Error Handling

Stack exposes a way to handle exceptions (which extend \Exception class) and PHP errors (which are \Throwable, but don't extend \Exception class, available in PHP7 and up):

Extension Points

You can use MiddlewareStack implementation as is, or you can extend it to change its behaviour. There are two extra protected methods that you can use to hook in your behaviour in the stack execution:

  1. MiddlewareStack is called in the middle of execution, as just another middleware. Override __invoke method if you need to inject extra functionlity there (like routing, with per-route middleware stack for example),
  2. finalizeProcessing is called prior to $response being returned by process method. Override if you need to do something with response prior to returning it.

History

Most middleware implementations that we found in November 2016. assumed and did too much, being mini frameworks themselves - they anticipated routing, substacking etc.

Slim framework has a nice middleware stack implementation, but it was not available as a stand-alone component, something that we needed, so we decided to extract it.

All versions of middlewarestack with dependencies

PHP Build Version
Package Version
Requires php Version >=5.6.0
psr/http-message Version ^1.0
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