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https://github.com/silverstripe/silverstripe-framework
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58 lines
1.6 KiB
Markdown
58 lines
1.6 KiB
Markdown
title: Request Filters
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summary: Create objects for modifying request and response objects across controllers.
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# Request Filters
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[api:RequestFilter] is an interface that provides two key methods. `preRequest` and `postRequest`. These methods are
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executed before and after a request occurs to give developers a hook to modify any global state, add request tracking or
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perform operations wrapped around responses and request objects. A `RequestFilter` is defined as:
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**mysite/code/CustomRequestFilter.php**
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:::php
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<?php
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class CustomRequestFilter implements RequestFilter {
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public function preRequest(SS_HTTPRequest $request, Session $session, DataModel $model) {
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// if(!something) {
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// By returning 'false' from the preRequest method, request execution will be stopped from continuing.
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// return false;
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// }
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// we can also set any properties onto the request that we need or add any tracking
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// Foo::bar();
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// return true to continue processing.
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return true;
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}
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public function postRequest(SS_HTTPRequest $request, SS_HTTPResponse $response, DataModel $model) {
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// response is about to be sent.
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// any modifications or tracking to be done?
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// Foo::unbar();
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// return true to send the response.
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return true;
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}
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}
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After defining the `RequestFilter`, add it as an allowed `filter` through the [Configuration API](../configuration)
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**mysite/_config/app.yml**
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:::yml
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Injector:
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RequestProcessor:
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properties:
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filters:
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- '%$CustomRequestFilter'
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## API Documentation
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* [api:RequestFilter]
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* [api:RequestProcessor]
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