webimpress / http-middleware-compatibility
Compatibility library for Draft PSR-15 HTTP Middleware
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Requires
- php: ^5.6 || ^7.0
- http-interop/http-middleware: ^0.1.1 || ^0.2 || ^0.3 || ^0.4.1 || ^0.5
- webimpress/composer-extra-dependency: ^0.2.2
Requires (Dev)
- phpunit/phpunit: ^5.7.23 || ^6.4.3
This package is auto-updated.
Last update: 2019-02-20 19:52:29 UTC
README
Purpose
The purpose of the library is to deliver consistent interface for different
versions of http-interop/http-middleware
which implements Draft of PSR-15 HTTP Middleware.
Many projects currently use different version of library
http-interop/http-middleware
and updating to newest version requires usually
major release. The library lets consumers of your component decide what version
of http-interop/http-middleware
they want to use and allow them to migrate to
the latest version at any time.
Usage
Your middleware should implement interface Webimpress\HttpMiddlewareCompatibility\MiddlewareInterface
,
and for delegator/request handler you should use interface
Webimpress\HttpMiddlewareCompatibility\HandlerInterface
.
<?php namespace MyNamespace; use Psr\Http\Message\ServerRequestInterface; use Webimpress\HttpMiddlewareCompatibility\HandlerInterface; use Webimpress\HttpMiddlewareCompatibility\MiddlewareInterface; class MyMiddleware implements MiddlewareInterface { public function process(ServerRequestInterface $request, HandlerInterface $handler) { // ... } }
Both interfaces are just aliases. It allows your middleware to work with
currently installed version of http-interop/http-middleware
library.
Delegate/Handler method
The method name was changed across the different versions of
http-interop/http-middleware
. First the method was called next
(release
0.1.1), then process
(from 0.2 - 0.4.1) and then handle
(in 0.5.0).
To accomplish all of them we provide constant
Webimpress\HttpMiddlewareCompatibility\HANDLER_METHOD
, which has
appropriate value depends on used version of http-middleware.
Here is an example how you can use it in your middleware:
<?php namespace MyNamespace; use Psr\Http\Message\ServerRequestInterface; use Webimpress\HttpMiddlewareCompatibility\HandlerInterface; use Webimpress\HttpMiddlewareCompatibility\MiddlewareInterface; use const Webimpress\HttpMiddlewareCompatibility\HANDLER_METHOD; class MyMiddleware implements MiddlewareInterface { public function process(ServerRequestInterface $request, HandlerInterface $handler) { return $handler->{HANDLER_METHOD}($request); } }
That's it! Now consumers of your component can decide what version of
http-interop/http-middleware
they want to use.