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Laminas Content Negotiation

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Introduction

api-tools-content-negotiation is a module for automating content negotiation tasks within a Laminas Framework application.

The following features are provided

• Mapping Accept header media types to specific view model types, and automatically casting controller results to those view model types.
• Defining Accept header media type whitelists; requests with Accept media types that fall outside the whitelist will be immediately rejected with a 406 Not Acceptable response.
• Defining Content-Type header media type whitelists; requests sending content bodies with Content-Type media types that fall outside the whitelist will be immediately rejected with a 415 Unsupported Media Type response.

Requirements

Please see the composer.json file.

Installation

Run the following composer command:

Alternately, manually add the following to your composer.json, in the require section:

And then run composer update to ensure the module is installed.

Finally, add the module name to your project's config/application.config.php under the modules key:

laminas-component-installer

If you use laminas-component-installer, that plugin will install api-tools-content-negotiation as a module for you.

Configuration

User Configuration

The top-level configuration key for user configuration of this module is api-tools-content-negotiation.

Key: controllers

The controllers key is utilized for mapping a content negotiation strategy to a particular controller service name (from the top-level controllers section). The value portion of the controller array can either be a named selector (see selectors below), or a selector definition.

A selector definition consists of an array with the key of the array being the name of a view model, and the value of it being an indexed array of media types that, when matched, will select that view model.

Example:

Key: selectors

The selectors key is utilized to create named selector definitions for reuse between many different controllers. The key part of the selectors array will be a name used to correlate the selector definition (which uses the format described in the controllers key).

Example:

A selector can contain multiple view models, each associated with different media types, allowing you to provide multiple representations. As an example, the following selector would allow a given controller to return either JSON or HTML output:

Key: accept_whitelist

The accept_whitelist key is utilized to instruct the content negotiation module which media types are acceptable for a given controller service name. When a controller service name is configured in this key, along with an indexed array of matching media types, only media types that match the Accept header of a given request will be allowed to be dispatched. Unmatched media types will receive a 406 Cannot honor Accept type specified response.

The value of each controller service name key can either be a string or an array of strings.

Example:

Key: content_type_whitelist

The content_type_whitelist key is utilized to instruct the content negotiation module which media types are valid for the Content-Type of a request. When a controller service name is configured in this key, along with an indexed array of matching media types, only media types that match the Content-Type header of a given request will be allowed to be dispatched. Unmatched media types will receive a 415 Invalid content-type specified response.

The value of each controller service name key can either be a string or an array of strings.

Example:

Key: x_http_method_override_enabled

• Since 1.3.0

This boolean flag determines whether or not the HttpMethodOverrideListener will be enabled by default.

Key: http_override_methods

• Since 1.3.0

The http_override_methods key is utilized to provide the HttpMethodOverrideListener with a map of allowed override methods for a given HTTP method, as specified via the X-HTTP-Method-Override header. Essentially, the values are:

As an example, if you want to allow the X-HTTP-Method-Override header to allow overriding HTTP GET requests with an alternate method, you might define this as follows:

Then, to make a request, you could do the following:

The above would then be interpreted as a PATCH request. If the same request were made via HTTP POST, or if a GET request were made with an override value of OPTIONS, the listener would raise a problem, as, in the former case, no maps are defined for POST, and, in the latter, OPTIONS is not in the map for GET.

System Configuration

The following configuration is provided in config/module.config.php to enable the module to function:

Laminas Events

Listeners

Laminas\ApiTools\ContentNegotiation\AcceptListener

This listener is attached to the MvcEvent::EVENT_DISPATCH event with priority -10. It is responsible for performing the actual selection and casting of a controller's view model based on the content negotiation configuration.

Laminas\ApiTools\ContentNegotiation\ContentTypeListener

This listener is attached to the MvcEvent::EVENT_ROUTE event with a priority of -625. It is responsible for examining the Content-Type header in order to determine how the content body should be deserialized. Values are then persisted inside of a ParameterDataContainer which is stored in the LaminasContentNegotiationParameterData key of the MvcEvent object.

Laminas\ApiTools\ContentNegotiation\AcceptFilterListener

This listener is attached to the MvcEvent::EVENT_ROUTE event with a priority of -625. It is responsible for ensuring the controller selected by routing is configured to respond to the specific media type in the current request's Accept header. If it cannot, it will short-circuit the MVC dispatch process by returning a 406 Cannot honor Accept type specified response.

Laminas\ApiTools\ContentNegotiation\ContentTypeFilterListener

This listener is attached to the MvcEvent::EVENT_ROUTE event with a priority of -625. It is responsible for ensuring the route matched controller can accept content in the request body specified by the media type in the current request's Content-Type header. If it cannot, it will short-circuit the MVC dispatch process by returning a 415 Invalid content-type specified response.

Laminas\ApiTools\ContentNegotiation\HttpMethodOverrideListener

• Since 1.3.0

This listener is attached to the MvcEvent::EVENT_ROUTE event with a priority of -40, but only if the x_http_method_override_enabled configuration flag was toggle on. It is responsible for checking if an X-HTTP-Method-Override header is present, and, if so, if it contains a value in the set allowed for the current HTTP request method invoked. If so, it resets the HTTP request method to the header value.

Laminas Services

Controller Plugins

Laminas\ApiTools\ContentNegotiation\ControllerPlugin\RouteParam (a.k.a "routeParam")

A controller plugin (Laminas\Mvc\Controller\AbstractActionController callable) that will return a single parameter with a particular name from the route match.

Laminas\ApiTools\ContentNegotiation\ControllerPlugin\QueryParam (a.k.a "queryParam")

A controller plugin (Laminas\Mvc\Controller\AbstractActionController callable) that will return a single parameter from the current request query string.

Laminas\ApiTools\ContentNegotiation\ControllerPlugin\BodyParam (a.k.a "bodyParam")

A controller plugin (Laminas\Mvc\Controller\AbstractActionController callable) that will return a single parameter from the content-negotiated content body.

Laminas\ApiTools\ContentNegotiation\ControllerPlugin\RouteParams (a.k.a "routeParams")

A controller plugin (Laminas\Mvc\Controller\AbstractActionController callable) that will return a all the route parameters.

Laminas\ApiTools\ContentNegotiation\ControllerPlugin\QueryParams (a.k.a "queryParams")

A controller plugin (Laminas\Mvc\Controller\AbstractActionController callable) that will return a all the query parameters.

Laminas\ApiTools\ContentNegotiation\ControllerPlugin\BodyParams (a.k.a "bodyParams")

A controller plugin (Laminas\Mvc\Controller\AbstractActionController callable) that will return a all the content-negotiated body parameters.