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# Stack/Cors
Library and middleware enabling cross-origin resource sharing for your
http-{foundation,kernel} using application. It attempts to implement the
[W3C Recommendation] for cross-origin resource sharing.
[W3C Recommendation]: http://www.w3.org/TR/cors/
Build status: 
## Installation
Require `asm89/stack-cors` using composer.
## Usage
This package can be used as a library or as [stack middleware].
[stack middleware]: http://stackphp.com/
### Options
| Option | Description | Default value |
|------------------------|------------------------------------------------------------|---------------|
| allowedMethods | Matches the request method. | `array()` |
| allowedOrigins | Matches the request origin. | `array()` |
| allowedOriginsPatterns | Matches the request origin with `preg_match`. | `array()` |
| allowedHeaders | Sets the Access-Control-Allow-Headers response header. | `array()` |
| exposedHeaders | Sets the Access-Control-Expose-Headers response header. | `false` |
| maxAge | Sets the Access-Control-Max-Age response header. | `false` |
| supportsCredentials | Sets the Access-Control-Allow-Credentials header. | `false` |
The _allowedMethods_ and _allowedHeaders_ options are case-insensitive.
You don't need to provide both _allowedOrigins_ and _allowedOriginsPatterns_. If one of the strings passed matches, it is considered a valid origin.
If `array('*')` is provided to _allowedMethods_, _allowedOrigins_ or _allowedHeaders_ all methods / origins / headers are allowed.
### Example: using the library
```php
<?php
use Asm89\Stack\CorsService;
$cors = new CorsService(array(
'allowedHeaders' => array('x-allowed-header', 'x-other-allowed-header'),
'allowedMethods' => array('DELETE', 'GET', 'POST', 'PUT'),
'allowedOrigins' => array('http://localhost'),
'allowedOriginsPatterns' => array('/localhost:\d/'),
'exposedHeaders' => false,
'maxAge' => false,
'supportsCredentials' => false,
));
$cors->addActualRequestHeaders(Response $response, $origin);
$cors->handlePreflightRequest(Request $request);
$cors->isActualRequestAllowed(Request $request);
$cors->isCorsRequest(Request $request);
$cors->isPreflightRequest(Request $request);
```
## Example: using the stack middleware
```php
<?php
use Asm89\Stack\Cors;
$app = new Cors($app, array(
// you can use array('*') to allow any headers
'allowedHeaders' => array('x-allowed-header', 'x-other-allowed-header'),
// you can use array('*') to allow any methods
'allowedMethods' => array('DELETE', 'GET', 'POST', 'PUT'),
// you can use array('*') to allow requests from any origin
'allowedOrigins' => array('localhost'),
// you can enter regexes that are matched to the origin request header
'allowedOriginsPatterns' => array('/localhost:\d/'),
'exposedHeaders' => false,
'maxAge' => false,
'supportsCredentials' => false,
));
```