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http-factory/.pullapprove.yml 0000644 00000000210 14736103225 0012336 0 ustar 00 extends: default
reviewers:
-
name: contributors
required: 1
teams:
- http-factory-contributors
http-factory/src/RequestFactoryInterface.php 0000644 00000000552 14736103225 0015276 0 ustar 00 <?php
namespace Interop\Http\Factory;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\UriInterface;
interface RequestFactoryInterface
{
/**
* Create a new request.
*
* @param string $method
* @param UriInterface|string $uri
*
* @return RequestInterface
*/
public function createRequest($method, $uri);
}
http-factory/src/StreamFactoryInterface.php 0000644 00000001731 14736103225 0015101 0 ustar 00 <?php
namespace Interop\Http\Factory;
use Psr\Http\Message\StreamInterface;
interface StreamFactoryInterface
{
/**
* Create a new stream from a string.
*
* The stream SHOULD be created with a temporary resource.
*
* @param string $content
*
* @return StreamInterface
*/
public function createStream($content = '');
/**
* Create a stream from an existing file.
*
* The file MUST be opened using the given mode, which may be any mode
* supported by the `fopen` function.
*
* @param string $file
* @param string $mode
*
* @return StreamInterface
*/
public function createStreamFromFile($file, $mode = 'r');
/**
* Create a new stream from an existing resource.
*
* The stream MUST be readable and may be writable.
*
* @param resource $resource
*
* @return StreamInterface
*/
public function createStreamFromResource($resource);
}
http-factory/src/ServerRequestFactoryInterface.php 0000644 00000001427 14736103225 0016467 0 ustar 00 <?php
namespace Interop\Http\Factory;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Message\UriInterface;
interface ServerRequestFactoryInterface
{
/**
* Create a new server request.
*
* The method and URI of the request SHOULD be derived from the given
* server parameters.
*
* If the method or URI parameter is passed, these values MUST be used
* instead of the server parameters.
*
* @param array $server
* @param string|null $method
* @param UriInterface|string|null $uri
*
* @throws \InvalidArgumentException
* If no valid method or URI can be determined.
*
* @return ServerRequestInterface
*/
public function createServerRequest(array $server, $method = null, $uri = null);
}
http-factory/src/UploadedFileFactoryInterface.php 0000644 00000002071 14736103225 0016201 0 ustar 00 <?php
namespace Interop\Http\Factory;
use Psr\Http\Message\UploadedFileInterface;
interface UploadedFileFactoryInterface
{
/**
* Create a new uploaded file.
*
* If a string is used to create the file, a temporary resource will be
* created with the content of the string.
*
* If a size is not provided it will be determined by checking the size of
* the file.
*
* @see http://php.net/manual/features.file-upload.post-method.php
* @see http://php.net/manual/features.file-upload.errors.php
*
* @param string|resource $file
* @param integer $size in bytes
* @param integer $error PHP file upload error
* @param string $clientFilename
* @param string $clientMediaType
*
* @return UploadedFileInterface
*
* @throws \InvalidArgumentException
* If the file resource is not readable.
*/
public function createUploadedFile(
$file,
$size = null,
$error = \UPLOAD_ERR_OK,
$clientFilename = null,
$clientMediaType = null
);
}
http-factory/src/ResponseFactoryInterface.php 0000644 00000000463 14736103225 0015445 0 ustar 00 <?php
namespace Interop\Http\Factory;
use Psr\Http\Message\ResponseInterface;
interface ResponseFactoryInterface
{
/**
* Create a new response.
*
* @param integer $code HTTP status code
*
* @return ResponseInterface
*/
public function createResponse($code = 200);
}
http-factory/src/UriFactoryInterface.php 0000644 00000000540 14736103225 0014402 0 ustar 00 <?php
namespace Interop\Http\Factory;
use Psr\Http\Message\UriInterface;
interface UriFactoryInterface
{
/**
* Create a new URI.
*
* @param string $uri
*
* @return UriInterface
*
* @throws \InvalidArgumentException
* If the given URI cannot be parsed.
*/
public function createUri($uri = '');
}
http-factory/README.md 0000644 00000000066 14736103225 0010454 0 ustar 00 # HTTP Factory
PSR-17 interfaces for HTTP factories.
http-factory/LICENSE 0000644 00000002065 14736103225 0010203 0 ustar 00 The MIT License (MIT)
Copyright (c) 2016 Woody Gilk
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
http-middleware/.pullapprove.yml 0000644 00000000213 14736103225 0013007 0 ustar 00 extends: default
reviewers:
-
name: contributors
required: 1
teams:
- http-middleware-contributors
http-middleware/src/DelegateInterface.php 0000644 00000000631 14736103225 0014474 0 ustar 00 <?php
namespace Interop\Http\ServerMiddleware;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
interface DelegateInterface
{
/**
* Dispatch the next available middleware and return the response.
*
* @param ServerRequestInterface $request
*
* @return ResponseInterface
*/
public function process(ServerRequestInterface $request);
}
http-middleware/src/MiddlewareInterface.php 0000644 00000001062 14736103225 0015036 0 ustar 00 <?php
namespace Interop\Http\ServerMiddleware;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
interface MiddlewareInterface
{
/**
* 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);
}
http-middleware/README.md 0000644 00000031517 14736103225 0011127 0 ustar 00 HTTP Server Middleware
======================
1. Summary
----------
The purpose of this PSR is to provide an interface that defines the formal
method signature for HTTP Server Middleware that is compatible with HTTP
Messages, as defined in [PSR-7][psr7].
[psr7]: http://www.php-fig.org/psr/psr-7/
2. Why Bother?
--------------
The HTTP Messages specification does not contain any reference to HTTP Middleware.
The design pattern used by middleware has existed for many years as the
[pipeline pattern][pipeline], or more specifically, "linear pipeline processing".
The general concept of reusable middleware was popularized within PHP by
[StackPHP][stackphp]. Since the release of the HTTP Messages standard, a number
of frameworks have adopted middleware that use HTTP Message interfaces.
Agreeing on a formal server middleware interface eliminates several problems and
provides a number of benefits:
* Provides a formal standard for middleware developers to commit to.
* Eliminates duplication of similar interfaces defined by various frameworks.
* Avoids minor discrepancies in method signatures.
* Enables any middleware component to run in any compatible framework.
[pipeline]: https://en.wikipedia.org/wiki/Pipeline_(computing)
[stackphp]: http://stackphp.com/
3. Scope
--------
### 3.1 Goals
* Create a middleware interface that uses HTTP Messages.
* Ensure that middleware will not be coupled to a specific implementation of HTTP Messages.
* Implement a middleware signature that is based on best practices.
### 3.2 Non-Goals
* Attempting to define how middleware is dispatched.
* Attempting to define interfaces for client/asynchronous middleware.
* Attempting to define the mechanism by which HTTP responses are created.
4. Approaches
-------------
There are currently two common approaches to server middleware that use HTTP Messages.
### 4.1 Double Pass
The signature used by most middleware implementations has been mostly the same
and is based on [Express middleware][express], which is defined as:
```
fn(request, response, next): response
```
[express]: http://expressjs.com/en/guide/writing-middleware.html
Based on the middleware implementations already used by frameworks that have
adopted this signature, the following commonalities are observed:
* The middleware is defined as a [callable][php-callable].
* The middleware is passed 3 arguments during invocation:
1. A `ServerRequestInterface` implementation.
2. A `ResponseInterface` implementation.
3. A `callable` that receives the request and response to delegate the next middleware.
[php-callable]: http://php.net/manual/language.types.callable.php
A significant number of projects provide and/or use exactly the same interface.
This approach is often referred to as "double pass" in reference to both the
request and response being passed to the middleware.
#### 4.1.1 Projects Using Double Pass
* [mindplay/middleman](https://github.com/mindplay-dk/middleman/blob/1.0.0/src/MiddlewareInterface.php#L24)
* [relay/relay](https://github.com/relayphp/Relay.Relay/blob/1.0.0/src/MiddlewareInterface.php#L24)
* [slim/slim](https://github.com/slimphp/Slim/blob/3.4.0/Slim/MiddlewareAwareTrait.php#L66-L75)
* [zendframework/zend-stratigility](https://github.com/zendframework/zend-stratigility/blob/1.0.0/src/MiddlewarePipe.php#L69-L79)
#### 4.1.2 Middleware Implementing Double Pass
* [bitexpert/adroit](https://github.com/bitExpert/adroit)
* [akrabat/rka-ip-address-middleware](https://github.com/akrabat/rka-ip-address-middleware)
* [akrabat/rka-scheme-and-host-detection-middleware](https://github.com/akrabat/rka-scheme-and-host-detection-middleware)
* [bear/middleware](https://github.com/bearsunday/BEAR.Middleware)
* [hannesvdvreken/psr7-middlewares](https://github.com/hannesvdvreken/psr7-middlewares)
* [los/api-problem](https://github.com/Lansoweb/api-problem)
* [los/los-rate-limit](https://github.com/Lansoweb/LosRateLimit)
* [monii/monii-action-handler-psr7-middleware](https://github.com/monii/monii-action-handler-psr7-middleware)
* [monii/monii-nikic-fast-route-psr7-middleware](https://github.com/monii/monii-nikic-fast-route-psr7-middleware)
* [monii/monii-response-assertion-psr7-middleware](https://github.com/monii/monii-response-assertion-psr7-middleware)
* [mtymek/blast-base-url](https://github.com/mtymek/blast-base-url)
* [ocramius/psr7-session](https://github.com/Ocramius/PSR7Session)
* [oscarotero/psr7-middlewares](https://github.com/oscarotero/psr7-middlewares)
* [php-middleware/block-robots](https://github.com/php-middleware/block-robots)
* [php-middleware/http-authentication](https://github.com/php-middleware/http-authentication)
* [php-middleware/log-http-messages](https://github.com/php-middleware/log-http-messages)
* [php-middleware/maintenance](https://github.com/php-middleware/maintenance)
* [php-middleware/phpdebugbar](https://github.com/php-middleware/phpdebugbar)
* [php-middleware/request-id](https://github.com/php-middleware/request-id)
* [relay/middleware](https://github.com/relayphp/Relay.Middleware)
The primary downside of this interface is that the while the interface itself is
a callable, there is currently no way to type hint a closure in a similar way.
### 4.2 Single Pass (Lambda)
The other approach to middleware is much closer to [StackPHP][stackphp] style
and is defined as:
```
fn(request, frame): response
```
Middleware taking this approach generally has the following commonalities:
* The middleware is defined with a specific interface with a method that takes
the request for processing.
* The middleware is passed 2 arguments during invocation:
1. An object that represents an HTTP request.
2. A delegate that receives the request to dispatch next middleware in the pipeline.
In this form, middleware has no access to a response until one is generated by
innermost middleware. Middleware can then modify the response before returning
back up the stack.
This approach is often referred to as "single pass" or "lambda" in reference to
only the request being passed to the middleware.
[php-closure]: http://php.net/closure
#### 4.2.1 Projects Using Single Pass
There are fewer examples of this approach within projects using HTTP Messages,
with one notable exception.
[Guzzle middleware][guzzle-middleware] is focused on outgoing (client) requests
and uses this signature:
```
function(RequestInterface $request, array $options): ResponseInterface
```
#### 4.2.2 Additional Projects Using Single Pass
There are also significant projects that predate HTTP Messages using this approach.
[StackPHP][stackphp] is based on [Symfony HttpKernel][httpkernel] and supports
middleware with this signature:
```
handle(Request $request, $type, $catch): Response
```
*__Note__: While Stack has multiple arguments, a response object is not included.*
[Laravel middleware][laravel-middleware] uses Symfony components and supports
middleware with this signature:
```
function handle(Request $request, callable $next): Response
```
[guzzle-middleware]: http://docs.guzzlephp.org/en/latest/handlers-and-middleware.html
[httpkernel]: https://symfony.com/doc/2.0/components/http_kernel/introduction.html
[laravel-middleware]: https://laravel.com/docs/master/middleware
### 4.3 Comparison of Approaches
The single pass approach to middleware has been well established in the PHP
community for many years. This is most evident with the large number of packages
that are based around StackPHP.
The double pass approach is much newer but has been almost universally used by
early adopters of HTTP Messages.
### 4.4 Chosen Approach
Despite the nearly universal adoption of the double-pass approach there are
significant issues regarding implementation.
The most severe is that passing an empty response has no guarantees that the
response is in a usable state. This is further exacerbated by the fact that a
middleware may modify the response before passing it for further dispatching.
Further compounding the problem is that there is no way to ensure that the
response body has not been written to, which can lead to incomplete output or
error responses being sent with cache headers attached. It is also possible
to end up with [corrupted body content][rob-allen-filtering] when writing over
existing body content if the new content is shorter than the original. The most
effective way to resolve these issues is to always provide a fresh stream when
modifying the body of a message.
[rob-allen-filtering]: https://akrabat.com/filtering-the-psr-7-body-in-middleware/
Some have argued that passing the response helps ensure dependency inversion.
While it is true that it helps avoid depending on a specific implementation of
HTTP messages, the problem can also be resolved by injecting factories into the
middleware to create HTTP message objects, or by injecting empty message instances.
With the creation of HTTP Factories in [PSR-17][psr17], a standard approach to
handling dependency inversion is possible.
[psr17]: https://github.com/php-fig/fig-standards/blob/master/proposed/http-factory/http-factory-meta.md
A more subjective, but also important, concern is that existing double-pass
middleware typically uses the `callable` type hint to refer to middleware.
This makes strict typing impossible, as there is no assurance that the `callable`
being passed implements a middleware signature, which reduces runtime safety.
**Due to these significant issues the lambda approach has been choosen for this proposal.**
5. Design Decisions
-------------------
### 5.1 Middleware Design
The `MiddlewareInterface` defines a single method that accepts a server
request and a delegate and must return a response. The middleware may:
- Evolve the request before passing it to the delegate to execute the next
available middleware.
- Evolve the response received from the delegate before returning it.
- Create and return a response without passing it to the delegate, thereby
preventing any further middleware from executing.
#### Why doesn't middleware use `__invoke`?
Doing so would conflict with existing middleware that implements the double-pass
approach and may want to implement the middleware interface.
In addition, classes that define `__invoke` can be type hinted as `callable`,
which results in less strict typing. This is generally undesirable, especially
when the `__invoke` method uses strict typing.
#### Why is a server request required?
To make it clear that the middleware can only be used in a synchronous, server
side context.
While not all middleware will need to use the additional methods defined by the
server request interface, external requests are typically handled asynchronously
and would need to return a [promise][promises] of a response. (This is primarily
due to the fact that multiple requests can be made in parallel and processed as
they are returned.) It is outside the scope of this proposal to address the needs
of asynchronous request/response life cycle.
Attempting to define client middleware would be premature at this point. Any future
proposal that is focused on client side request processing should have the opportunity
to define a standard that is specific to the nature of asynchronous middleware.
_See "client vs server side middleware" in [relevant links](#8-relevant-links) for
additional information._
[promises]: https://promisesaplus.com/
### 5.2 Delegate Design
The `DelegateInterface` defines a single method that accepts a request and
returns a response. The delegate interface must be implemented by any middleware
dispatcher that uses middleware implementing `MiddlewareInterface`.
#### Why isn't the delegate a `callable`?
Using an interface type hint improves runtime safety and IDE support.
_See "discussion of FrameInterface" in [relevant links](#8-relevant-links) for
additional information._
#### Why does the delegate conflict with middleware?
Both the middleware and delegate interface define a `process` method to prevent
misuse of middleware as delegates.
The implementation of delegate should be defined within middleware dispatching systems.
6. People
---------
### 6.1 Editor(s)
* Woody Gilk, <woody.gilk@gmail.com>
### 6.2 Sponsors
* Paul M Jones, <pmjones88@gmail.com> (Coordinator)
* Jason Coward, <jason@opengeek.com> (Sponsor)
### 6.3 Contributors
* Rasmus Schultz, <rasmus@mindplay.dk>
* Matthew Weier O'Phinney, <mweierophinney@gmail.com>
7. Votes
--------
* [Entrance Vote](https://groups.google.com/d/msg/php-fig/v9AijALWJhI/04XCwqgIEAAJ)
* **Acceptance Vote:** _(not yet taken)_
8. Relevant Links
-----------------
_**Note:** Order descending chronologically._
* [PHP-FIG mailing list thread](https://groups.google.com/d/msg/php-fig/vTtGxdIuBX8/NXKieN9vDQAJ)
* [The PHP League middleware proposal](https://groups.google.com/d/msg/thephpleague/jyztj-Nz_rw/I4lHVFigAAAJ)
* [PHP-FIG discussion of FrameInterface](https://groups.google.com/d/msg/php-fig/V12AAcT_SxE/aRXmNnIVCwAJ)
* [PHP-FIG discussion about client vs server side middleware](https://groups.google.com/d/msg/php-fig/vBk0BRgDe2s/GTaT0yKNBgAJ)
9. Errata
---------
...
http-middleware/LICENSE 0000644 00000002117 14736103225 0010647 0 ustar 00 The MIT License (MIT)
Copyright (c) 2016 PHP Framework Interoperability Group
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.