psr7-middlewares
Collection of PSR-7 middlewares.
Requirements
- PHP >= 5.5
- A PSR-7 HTTP Message implementation, for example zend-diactoros
- A PSR-7 middleware dispatcher compatible with the following signature:
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
function (RequestInterface $request, ResponseInterface $response, callable $next) {
// ...
}
So, you can use these midlewares with:
- Relay
- Expressive
- Slim 3
- Spiral
- etc...
Instalation
This package is installable and autoloadable via Composer as oscarotero/psr7-middlewares.
$ composer require oscarotero/psr7-middlewares
Usage example:
use Psr7Middlewares\Middleware;
use Relay\RelayBuilder;
use Zend\Diactoros\Response;
use Zend\Diactoros\ServerRequestFactory;
use Zend\Diactoros\Stream;
//Set a stream factory used by some middlewares
//(Required only if Zend\Diactoros\Stream is not detected)
Middleware::setStreamFactory(function ($file, $mode) {
return new Stream($file, $mode);
});
//Create a relay dispatcher and add some middlewares:
$relay = new RelayBuilder();
$dispatcher = $relay->newInstance([
//Calculate the response time
Middleware::responseTime(),
//Add an Uuid to request
Middleware::uuid(),
//Minify the result
Middleware::minify(),
//Adds the php debug bar
Middleware::debugBar(),
//Handle errors
Middleware::errorHandler('error_handler_function')->catchExceptions(true),
//Override the method using X-Http-Method-Override header
Middleware::methodOverride(),
//Removes www subdomain
Middleware::www(false)->redirect(301),
//Block search engines robots indexing
Middleware::robots(),
//Geolocation
Middleware::geolocate(),
//Detect client device
Middleware::detectDevice(),
//Parse the request payload
Middleware::payload(),
//Remove the path prefix
Middleware::basePath('/my-site/web'),
//Remove the trailing slash
Middleware::trailingSlash(),
//Digest authentication
Middleware::digestAuthentication(['username' => 'password']),
//Get the client ip
Middleware::clientIp(),
//Allow only some ips
Middleware::firewall(['127.0.0.*']),
//Detects the user preferred language
Middleware::languageNegotiator(['gl', 'es', 'en']),
//Detects the format
Middleware::formatNegotiator(),
//Execute fast route
Middleware::fastRoute($app->get('dispatcher')),
]);
$response = $dispatcher(ServerRequestFactory::fromGlobals(), new Response());
Available middlewares
- AccessLog
- AttributeMapper
- AuraRouter
- AuraSession
- BasePath
- BasicAuthentication
- BlockSpam
- Cache
- ClientIp
- Cors
- Csp
- Csrf
- DebugBar
- Delay
- DetectDevice
- DigestAuthentication
- EncodingNegotiator
- ErrorHandler
- FastRoute
- FormTimestamp
- Firewall
- FormatNegotiator
- Geolocate
- GoogleAnalytics
- Honeypot
- Https
- ImageTransformer
- LanguageNegotiation
- LeagueRoute
- MethodOverride
- Minify
- Payload
- PhpSession
- Piwik
- ReadResponse
- Recaptcha
- Rename
- ResponseTime
- Robots
- SaveResponse
- Shutdown
- TrailingSlash
- Uuid
- Whoops
- Www
AccessLog
To generate access logs for each request using the Apache's access log format. This middleware requires a Psr log implementation, for example monolog:
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\AuraRouter;
use Monolog\Logger;
use Monolog\Handler\ErrorLogHandler;
//Create the logger
$logger = new Logger('access');
$logger->pushHandler(new ErrorLogHandler());
//Add to the dispatcher
$dispatcher = $relay->getInstance([
//Required to get the Ip
Middleware::ClientIp(),
Middleware::AccessLog($logger) //Instance of Psr\Log\LoggerInterface
->combined(true) //(optional) To use the Combined Log Format instead the Common Log Format
]);
AttributeMapper
Maps middleware specific attribute to regural request attribute under desired name:
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::BasicAuthentication([
'username1' => 'password1',
'username2' => 'password2'
])
->realm('My realm'), //(optional) change the realm value
Middleware::attributeMapper([
Middleware\BasicAuthentication::KEY => 'auth:username'
]),
function ($request, $response, $next) {
$username = BasicAuthentication::getUsername($request);
assert($username === $request->getAttribute('auth:username'));
return $next($request, $response);
}
]);
AuraRouter
To use Aura.Router (3.x) as a middleware:
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\AuraRouter;
use Aura\Router\RouterContainer;
//Create the router
$router = new RouterContainer();
$map = $router->getMap();
$map->get('hello', '/hello/{name}', function ($request, $response, $myApp) {
//The route parameters are stored as attributes
$name = $request->getAttribute('name');
//You can get also the route instance
$route = AuraRouter::getRoute($request);
//Write directly in the response's body
$response->getBody()->write('Hello '.$name);
//or echo the output (it will be captured and writted into body)
echo 'Hello world';
//or return a string
return 'Hello world';
//or return a new response
return $response->withStatus(200);
});
//Add to the dispatcher
$dispatcher = $relay->getInstance([
Middleware::AuraRouter($router) //Instance of Aura\Router\RouterContainer
->arguments($myApp) //(optional) append more arguments to the controller
]);
AuraSession
Creates a new Aura.Session instance with the request.
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\AuraSession;
$dispatcher = $relay->getInstance([
Middleware::AuraSession(),
->factory($sessionFactory) //(optional) Intance of Aura\Session\SessionFactory
->name('my-session-name'), //(optional) custom session name
function ($request, $response, $next) {
//Get the session instance
$session = AuraSession::getSession($request);
return $response;
}
]);
BasePath
Strip off the prefix from the uri path of the request. This is useful to combine with routers if the root of the website is in a subdirectory. For example, if the root of your website is /web/public
, a request with the uri /web/public/post/34
will be converted to /post/34
. You can provide the basePath to remove or let the middleware autodetect it.
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\BasePath;
$dispatcher = $relay->getInstance([
Middleware::BasePath()
->basePath('/web/public') // (optional) The path to remove...
->autodetect(true), // (optional) ...or autodetect the base path
function ($request, $response, $next) {
//Get the stripped off prefix
$basePath = BasePath::getBasePath($request);
return $response;
}
]);
BasicAuthentication
Implements the basic http authentication. You have to provide an array with all users and password:
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::BasicAuthentication([
'username1' => 'password1',
'username2' => 'password2'
])
->realm('My realm'), //(optional) change the realm value
function ($request, $response, $next) {
$username = BasicAuthentication::getUsername($request);
return $next($request, $response);
}
]);
BlockSpam
To block referral spam usin the piwik/referrer-spam-blacklist list
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::BlockSpam('spammers.txt'), //(optional) to set a custom spammers list instead the piwik's list
]);
Cache
Uses micheh/psr7-cache. Saves the responses' headers in cache and returns a 304 response (Not modified) if the request is cached. It also adds Cache-Control
and Last-Modified
headers to the response. You need a cache library compatible with psr-6.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::Cache(new Psr6CachePool()) //the PSR-6 cache implementation
->cacheControl('max-age=3600'), //(optional) to add this Cache-Control header to all responses
]);
ClientIp
Detects the client ip(s).
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\ClientIp;
$dispatcher = $relay->getInstance([
Middleware::ClientIp()
->remote() // (optional) Hack to get the ip from localhost environment
->headers([ // (optional) to change the trusted headers
'Client-Ip',
'X-Forwarded-For',
'X-Forwarded'
]),
function ($request, $response, $next) {
//Get the user ip
$ip = ClientIp::getIp($request);
//Get all ips found in the headers
$all_ips = ClientIp::getIps($request);
return $next($request, $response);
}
]);
Cors
To use the neomerx/cors-psr7 library:
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::Cors($settings) //(optional) instance of Neomerx\Cors\Contracts\Strategies\SettingsStrategyInterface
->origin('http://example.com:123') //(optional) the server origin
->allowedOrigins([ //(optional) Allowed origins
'http://good.example.com:321' => true,
'http://evil.example.com:123' => null,
])
->allowedMethods([ //(optional) Allowed methods. The second argument forces to add the allowed methods to preflight response
'GET' => true,
'PATCH' => null,
'POST' => true,
'PUT' => null,
'DELETE' => true,
], true)
->allowedHeaders([ //(optional) Allowed headers. The second argument forces to add the allowed headers to preflight response
'content-type' => true,
'some-disabled-header' => null,
'x-enabled-custom-header' => true,
], true)
->exposedHeaders([ //(optional) Headers other than the simple ones that might be exposed to user agent
'Content-Type' => true,
'X-Custom-Header' => true,
'X-Disabled-Header' => null,
])
->allowCredentials() //(optional) If access with credentials is supported by the resource.
->maxAge(0) //(optional) Set pre-flight cache max period in seconds.
->checkHost(true) //(optional) If request 'Host' header should be checked against server's origin.
]);
Csp
To use the paragonie/csp-builder library to add the Content-Security-Policy header to the response.
$dispatcher = $relay->getInstance([
Middleware::csp($directives) //(optional) the array with the directives.
->addSource('img-src', 'https://ytimg.com') //(optional) to add extra sources to whitelist
->addDirective('upgrade-insecure-requests', true) //(optional) to add new directives (if it doesn't already exist)
->supportOldBrowsers(false) //(optional) support old browsers (e.g. safari). True by default
]);
Csrf
To add a protection layer agains CSRF (Cross Site Request Forgety). The middleware injects a hidden input with a token in all POST forms and them check whether the token is valid or not.
$dispatcher = $relay->getInstance([
//(optional) Used to open a PHP session before
Middleware::phpSession(),
//required to get the format of the request (only executed in html requests)
Middleware::FormatNegotiator(),
//required to get the user ip
Middleware::ClientIp(),
Middleware::Csrf($storage) //(optional) array or ArrayAccess used to store the CSRF tokens. If it's not defined use $_SESSION.
]);
DebugBar
Inserts the PHP debug bar 2.x in the html body. This middleware requires Middleware::formatNegotiator
executed before, to insert the debug bar only in Html responses.
Because this middleware serves also the debugbar assets (css, js and fonts), it must be added before the router to avoid 404 responses.
use Psr7Middlewares\Middleware;
use DebugBar\StandardDebugBar;
$debugBar = new StandardDebugBar();
$dispatcher = $relay->getInstance([
Middleware::FormatNegotiator(),
Middleware::DebugBar($debugBar) //(optional) Own instance of debugbar
->captureAjax(true) //(optional) To send data in headers in ajax
]);
Delay
Delays the response to simulate slow bandwidth in local environments. You can use a number or an array to generate random values in seconds.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::delay(3.5), //delay the response 3.5 seconds
Middleware::delay([1, 2.5]), //delay the response between 1 and 1.5 seconds
]);
DetectDevice
Uses Mobile-Detect library to detect the client device.
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\DetectDevice;
$dispatcher = $relay->getInstance([
Middleware::DetectDevice(),
function ($request, $response, $next) {
//Get the device info
$device = DetectDevice::getDevice($request);
if ($device->isMobile()) {
//mobile stuff
}
elseif ($device->isTablet()) {
//tablet stuff
}
elseif ($device->is('bot')) {
//bot stuff
}
return $next($request, $response);
},
]);
DigestAuthentication
Implements the digest http authentication. You have to provide an array with the users and password:
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::DigestAuthentication([
'username1' => 'password1',
'username2' => 'password2'
])
->realm('My realm') //(optional) custom realm value
->nonce(uniqid()), //(optional) custom nonce value
function ($request, $response, $next) {
$username = DigestAuthentication::getUsername($request);
return $next($request, $response);
}
]);
EncodingNegotiator
Uses willdurand/Negotiation (2.x) to detect and negotiate the encoding type of the document.
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\EncodingNegotiator;
$dispatcher = $relay->getInstance([
Middleware::EncodingNegotiator()
->encodings(['gzip', 'deflate']), //(optional) configure the supported encoding types
function ($request, $response, $next) {
//get the encoding (for example: gzip)
$encoding = EncodingNegotiator::getEncoding($request);
return $next($request, $response);
}
]);
ErrorHandler
Executes a handler if the response returned by the next middlewares has any error (status code 400-599). You can catch also the exceptions throwed.
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\ErrorHandler;
function handler($request, $response, $myApp) {
switch ($response->getStatusCode()) {
case 404:
return 'Page not found';
case 500:
//you can get the exception catched
$exception = ErrorHandler::getException($request);
return 'Server error: '.$exception->getMessage();
default:
return 'There was an error'
}
}
$dispatcher = $relay->getInstance([
Middleware::ErrorHandler('handler') //(optional) The error handler
->arguments($myApp) //(optional) extra arguments to the handler
->catchExceptions() //(optional) to catch exceptions
]);
FastRoute
To use FastRoute as a middleware.
use Psr7Middlewares\Middleware;
$router = FastRoute\simpleDispatcher(function (FastRoute\RouteCollector $r) {
$r->addRoute('GET', '/blog/{id:[0-9]+}', function ($request, $response, $app) {
return 'This is the post number'.$request->getAttribute('id');
});
});
$dispatcher = $relay->getInstance([
Middleware::FastRoute($router) //Instance of FastRoute\Dispatcher
->argument($myApp) //(optional) arguments appended to the controller
]);
Firewall
Uses M6Web/Firewall to provide a IP filtering. This middleware deppends of ClientIp (to extract the ips from the headers).
See the ip formats allowed for trusted/untrusted options:
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//required to capture the user ips before
Middleware::ClientIp(),
//set the firewall
Middleware::Firewall()
->trusted(['123.0.0.*']) //(optional) ips allowed
->untrusted(['123.0.0.1']) //(optional) ips not allowed
]);
FormatNegotiator
Uses willdurand/Negotiation (2.x) to detect and negotiate the format of the document using the url extension and/or the Accept
http header. It also adds the Content-Type
header to the response if it's missing.
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\FormatNegotiator;
$dispatcher = $relay->getInstance([
Middleware::FormatNegotiator()
->defaultFormat('html') //(optional) default format if it's unable to detect. (by default is "html")
->addFormat('pdf', ['application/pdf', 'application/x-download']), //(optional) add new formats and mimetypes
function ($request, $response, $next) {
//get the format (for example: html)
$format = FormatNegotiator::getFormat($request);
return $next($request, $response);
}
]);
FormTimestamp
Simple spam protection based on injecting a hidden input in all post forms with the current timestamp. On submit the form, check the time value. If it's less than (for example) 3 seconds ago, assumes it's a bot, so returns a 403 response. You can also set a max number of seconds before the form expires.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//required to get the format of the request (only executed in html requests)
Middleware::FormatNegotiator(),
Middleware::FormTimestamp()
->key('my-secret-key'), //Key used to encrypt/decrypt the input value.
->min(5) //(optional) Minimum seconds needed to validate the request (default: 3)
->max(3600) //(optional) Life of the form in second. Default is 0 (no limit)
->inputName('time-token') //(optional) Name of the input (default: hpt_time)
]);
Geolocate
Uses Geocoder library to geolocate the client using the ip. This middleware deppends of ClientIp (to extract the ips from the headers).
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\Geolocate;
$dispatcher = $relay->getInstance([
//required to capture the user ips before
Middleware::ClientIp(),
Middleware::Geolocate($geocoder), //(optional) To provide a custom Geocoder instance
function ($request, $response, $next) {
//get the location
$addresses = Geolocate::getLocation($request);
//get the country
$country = $addresses->first()->getCountry();
$response->getBody()->write('Hello to '.$country);
return $next($request, $response);
}
]);
GoogleAnalytics
Inject the Google Analytics code in all html pages.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//required to get the format of the request
Middleware::formatNegotiator(),
Middleware::GoogleAnalytics('UA-XXXXX-X') //The site id
]);
Gzip
Use gzip functions to compress the response body, inserting also the Content-Encoding
header.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//required to get the preferred encoding type
Middleware::EncodingNegotiator(),
Middleware::Gzip()
]);
Honeypot
Implements a honeypot spam prevention. This technique is based on creating a input field that should be invisible and left empty by real users but filled by most spam bots. The middleware scans the html code and inserts this inputs in all post forms and check in the incoming requests whether this value exists and is empty (is a real user) or doesn't exist or has a value (is a bot) returning a 403 response.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//required to get the format of the request (only executed in html requests)
Middleware::formatNegotiator(),
Middleware::Honeypot()
->inputName('my_name') //(optional) The name of the input field (by default "hpt_name")
->inputClass('hidden') //(optional) The class of the input field (by default "hpt_input")
]);
Https
Returns a redirection to the https scheme if the request uri is http. It also adds the Strict Transport Security header to protect against protocol downgrade attacks and cookie hijacking.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::Https()
->maxAge(1000000) //(optional) max-age directive for the Strict-Transport-Security header. By default is 31536000 (1 year)
->includeSubdomains() //(optional) To add the "includeSubDomains" attribute to the Strict-Transport-Security header.
]);
ImageTransformer
Uses imagecow/imagecow 2.x to transform images on demand. You can resize, crop, rotate and convert to other formats. Use the the imagecow syntax to define the available sizes.
To define the available sizes, you have to asign a filename prefix representing the size, so any file requested with this prefix will be dinamically transformed.
There's also support for Client hints to avoid to serve images larger than needed (currently supported only in chrome and opera).
If you want to save the transformed images in the cache, provide a library compatible with psr-6 for that.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//required to get the format of the request
Middleware::formatNegotiator(),
Middleware::imageTransformer([ // The available sizes of the images.
'small.' => 'resizeCrop,50,50', //Creates a 50x50 thumb of any image prefixed with "small." (example: /images/small.avatar.jpg)
'medium.' => 'resize,500|format,jpg', //Resize the image to 500px and convert to jpg
'pictures/large.' => 'resize,1000|format,jpg', //Transform only images inside "pictures" directory (example: /images/pcitures/large.avatar.jpg)
])
->clientHints() // (optional) To enable the client hints headers
->cache(new Psr6CachePool()) // (optional) To save the transformed images in the cache
//Used to read the image files and returns the response with them
Middleware::readResponse()
->storage('/path/to/images'),
]);
LanguageNegotiation
Uses willdurand/Negotiation to detect and negotiate the client language using the Accept-Language header and (optionally) the uri's path. You must provide an array with all available languages:
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\LanguageNegotiator;
$dispatcher = $relay->getInstance([
Middleware::LanguageNegotiator(['gl', 'en']) //Available languages
->usePath(true) //(optional) To search the language in the path: /gl/, /en/
->redirect() //(optional) To return a redirection if the language is not in the path
->basePath('/web') //(optional) Basepath used to search the language
function ($request, $response, $next) {
//Get the preferred language
$language = LanguageNegotiator::getLanguage($request);
return $next($request, $response);
}
]);
LeagueRoute
To use league/route (2.x) as a middleware:
use Psr7Middlewares\Middleware;
use League\Route\RouteCollection;
$router = new RouteCollection();
$router->get('/blog/{id:[0-9]+}', function ($request, $response, $vars) {
return 'This is the post number'.$vars['id'];
});
$dispatcher = $relay->getInstance([
Middleware::LeagueRoute($router) //The RouteCollection instance
]);
MethodOverride
Overrides the request method using the X-Http-Method-Override
header. This is useful for clients unable to send other methods than GET and POST:
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::MethodOverride()
->get(['HEAD', 'CONNECT', 'TRACE', 'OPTIONS']), //(optional) to customize the allowed GET overrided methods
->post(['PATCH', 'PUT', 'DELETE', 'COPY', 'LOCK', 'UNLOCK']), //(optional) to customize the allowed POST overrided methods
]);
Minify
Uses mrclay/minify to minify the html, css and js code from the responses.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//required to get the format of the response
Middleware::formatNegotiator(),
Middleware::Minify()
]);
Payload
Parses the body of the request if it's not parsed and the method is POST, PUT or DELETE. It has support for json, csv and url encoded format.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::Payload(),
function ($request, $response, $next) {
//Get the parsed body
$content = $request->getParsedBody();
return $next($request, $response);
}
]);
PhpSession
Initializes a php session using the request data.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::PhpSession()
->name('SessionId') //(optional) Name of the session
->id('ABC123') //(optional) Id of the session
function ($request, $response, $next) {
//Use the global $_SESSION variable to get/set data
$_SESSION['name'] = 'John';
return $next($request, $response);
}
]);
Piwik
To use the Piwik analytics platform. Injects the javascript code just before the </body>
closing tag.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//required to get the format of the request
Middleware::formatNegotiator(),
Middleware::Piwik()
->piwikUrl('//example.com/piwik') // The url of the installed piwik
->siteId(1) // (optional) The site id (1 by default)
->addOption('setDoNotTrack', 'true') // (optional) Add more options to piwik API
]);
ReadResponse
Read the response content from a file. It's the opposite of SaveResponse
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::ReadResponse('path/to/files') // Path where the files are stored
->appendQuery(true) // (optional) to use the uri query in the filename
->basePath('public') // (optional) basepath ignored from the request uri
]);
Recaptcha
To use the google recaptcha library for spam prevention.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//required to get the user IP
Middleware::ClientIp(),
Middleware::Recapcha('secret') //The secret key
]);
Rename
Renames the request path. This is useful in some use cases:
- To rename public paths with random suffixes for security reasons, for example the path
/admin
to a more unpredictible/admin-19640983
- Create pretty urls without use any router. For example to access to the path
/static-pages/about-me.php
under the more friendly/about-me
Note that the original path wont be publicly accesible. On above examples, requests to /admin
or /static-pages/about-me.php
returns 404 responses.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::Rename([
'/admin' => '/admin-19640983',
]),
function ($request, $response, $next) {
$path = $request->getUri()->getPath(); // /admin
return $next($request, $response);
}
]);
ResponseTime
Calculates the response time (in miliseconds) and saves it into X-Response-Time
header:
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::ResponseTime()
]);
Robots
Disables the robots of the search engines for non-production environment. Adds automatically the header X-Robots-Tag: noindex, nofollow, noarchive
in all responses and returns a default body for /robots.txt
request.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::Robots(false) //(optional) Set true to allow search engines instead disallow
]);
SaveResponse
Saves the response content into a file if all of the following conditions are met:
- The method is
GET
- The status code is
200
- The
Cache-Control
header does not containno-cache
value - The request has not query parameters.
This is useful for cache purposes
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::SaveResponse('path/to/files') //Path directory where save the responses
->appendQuery(true) // (optional) to append the uri query to the filename
->basePath('public') //(optional) basepath ignored from the request uri
]);
Shutdown
Useful to display a 503 maintenance page. You need to specify a handler.
use Psr7Middlewares\Middleware;
function shutdownHandler ($request, $response, $app) {
$response->getBody()->write('Service unavailable');
}
$dispatcher = $relay->getInstance([
Middleware::Shutdown('shutdownHandler') //(optional) Callable that generate the response
->arguments($app) //(optional) to add extra arguments to the handler
]);
TrailingSlash
Removes (or adds) the trailing slash of the path. For example, /post/23/
will be converted to /post/23
. If the path is /
it won't be converted. Useful if you have problems with the router.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::TrailingSlash(true) //(optional) set true to add the trailing slash instead remove
->redirect(301) //(optional) to return a 301 (seo friendly) or 302 response to the new path
->basePath('public') //(optional) basepath
]);
Uuid
Uses ramsey/uuid (3.x) to generate an Uuid (Universally Unique Identifiers) for each request (compatible with RFC 4122 versions 1, 3, 4 and 5). It's usefull for debugging purposes.
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\Uuid;
$dispatcher = $relay->getInstance([
Middleware::Uuid()
->version(4) //(optional) version of the identifier (1 by default). Versions 3 and 5 need more arguments (see https://github.com/ramsey/uuid#examples)
->header(false), //(optional) Name of the header to store the identifier (X-Uuid by default). Set false to don't save header
function ($request, $response, $next) {
//Get the X-Uuid header
$id = $request->getHeaderLine('X-Uuid');
//Get the Uuid instance
$uuid = Uuid::getUuid($request);
echo $uuid->toString();
return $next($request, $response);
}
]);
Whoops
To use whoops 2.x as error handler.
use Psr7Middlewares\Middleware;
use Psr7Middlewares\Middleware\Whoops;
use Whoops\Run;
$whoops = new Run();
$dispatcher = $relay->getInstance([
//(optional) this allows whoops to choose the best handler according with the expected format
Middleware::formatNegotiator(),
Middleware::Whoops($whoops) //(optional) provide a custom whoops instance
->catchErrors(false) //(optional) to catch not only exceptions but also php errors (true by default)
]);
Www
Adds or removes the www
subdomain in the host uri and, optionally, returns a redirect response. The following types of host values wont be changed:
- The one word hosts, for example:
http://localhost
. - The ip based hosts, for example:
http://0.0.0.0
. - The multi domain hosts, for example:
http://subdomain.example.com
.
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
Middleware::Www(true) //(optional) Add www instead remove it
->redirect(301) //(optional) to return a 301 (seo friendly), 302 response to the new host or false to don't redirect. (301 by default)
]);
Lazy/conditional middleware creation
You may want to create middleware in a lazy way under some circunstances:
- The middleware is needed only in a specific context (for example in development environments)
- The middleware creation is expensive and is not needed always (because a previous middleware returns a cached response)
To handle with this, you can use the Middleware::create()
method that must return a callable or false. Example:
use Psr7Middlewares\Middleware;
$dispatcher = $relay->getInstance([
//This middleware can return a cached response
//so the next middleware may not be executed
Middleware::cache($myPsr6CachePool),
//Let's say this middleware is expensive, so use a proxy for lazy creation
Middleware::create(function () use ($app) {
return Middleware::auraRouter($app->get('router'));
}),
//This middleware is needed only in production
Middleware::create(function () {
return (getenv('ENV') !== 'production') ? false : Middleware::minify();
}),
//This middleware is needed in some cases
Middleware::create(function ($request, $response) {
if ($request->hasHeader('Foo')) {
return Middleware::www();
}
return false;
})
]);
Extending middlewares
Some middlewares use different functions to change the http messages, depending of some circunstances. For example, Payload parses the raw body content, and the method used depends of the type of the content: it can be json, urlencoded, csv, etc. Other example is the Minify middleware that needs a different minifier for each format (html, css, js, etc), or the Gzip that depending of the Accept-Encoding
header, use a different method to compress the response body.
The interface Psr7Middlewares\Transformers\ResolverInterface
provides a way to resolve and returns the apropiate "transformer" in each case. The transformer is just a callable that accepts a http message (request or response) and returns the transformed message again. You can create custom resolvers or extend the included in this package to add your owns. Let's see an example:
use Psr7Middlewares\Transformers\BodyParser;
use Psr\Http\Message\ServerRequestInterface;
class MyBodyParser extends BodyParser
{
/**
* New parser used in request with the format "php"
*/
public function php(ServerRequestInterface $request)
{
$data = unserialize((string) $request->getBody());
return $request->withParsedBody($data);
}
}
//Use the resolver
$dispatcher = $relay->getInstance([
Middleware::Payload()->resolver(new MyBodyParser())
]);
The following middlewares are using resolvers that you can customize:
- Payload To parse the body according with the format (json, urlencoded, csv, ...)
- Gzip To encode the body with the encoding method supported by the browser (gzip, deflate)
- Minify To use different minifiers for each format (html, css, js, ...)
Contribution
New middlewares are appreciated. Just create a pull request.