ZF Versioning

Introduction

zf-versioning is a Zend Framework module for automating service versioning through both URIs and Accept or Content-Type header media types. Information extracted from either the URI or header media type that relates to versioning will be made available in the route match object. In situations where a controller service name is utilizing a sub-namespace matching the regexp V(\d), the matched controller service names will be updated with the currently matched version string.

Requirements

Please see the composer.json file.

Installation

Run the following composer command:

$ composer require zfcampus/zf-versioning

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

"require": {
    "zfcampus/zf-versioning": "^1.2"
}

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:

return [
    /* ... */
    'modules' => [
        /* ... */
        'ZF\Versioning',
    ],
    /* ... */
];

zf-component-installer

If you use zf-component-installer, that plugin will install zf-versioning as a module for you.

Configuration

User Configuration

The top-level configuration key for user configuration of this module is zf-versioning.

Key: `content-type`

The content-type key is used for specifying an array of regular expressions that will be used in parsing both Content-Type and Accept headers for media type based versioning information. A default regular expression is provided in the implementation which should also serve as an example of what kind of regex to create for more specific parsing:

'#^application/vnd\.(?P<zf_ver_vendor>[^.]+)\.v(?P<zf_ver_version>\d+)\.(?P<zf_ver_resource>[a-zA-Z0-9_-]+)$#'

This rule will match the following pseudo-code route:

application/vnd.{api name}.v{version}(.{resource})?+json

All captured parts should utilize named parameters. A more specific example, with the top-level key would look like:

'zf-versioning' => [
    'content-type' => [
        '#^application/vendor\.(?P<vendor>mwop)\.v(?P<version>\d+)\.(?P<resource>status|user)$#',
    ],
],

Key: `default_version`

The default_version key provides the default version number to use in case a version is not provided by the client. 1 is the default for default_version.

The setting accepts one of the two following possible values:

A PHP integer indicating the default version number for all routes.
An associative array, where the keys are route names, and the values the default version to use with the associated route.

Full Example:

// Set v2 as default version for all routes
'zf-versioning' => [
    'default_version' => 2,
],

// Set default version to v2 and v3 for the users and status routes respectively
'zf-versioning' => [
    'default_version' => [
        'myapi.rest.users' => 2,
        'myapi.rpc.status' => 3,
    ],
],

Key: `uri`

The uri key is responsible for identifying which routes need to be prepended with route matching information for URL based versioning. This key is an array of route names that is used in the ZF2 router.routes configuration. If a particular route is a child route, the chain will happen at the top-most ancestor.

The route matching segment consists of a rule of [/v:version] while specifying a constraint of digits only for the version parameter.

Example:

'zf-versioning' => [
    'uri' => [
        'api',
        'status',
        'user',
    ],
],

System Configuration

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

'service_manager' => [
    'factories' => [
        \ZF\Versioning\AcceptListener::class => \ZF\Versioning\Factory\AcceptListenerFactory::class,
        \ZF\Versioning\ContentTypeListener::class => \ZF\Versioning\Factory\ContentTypeListenerFactory::class,
        \ZF\Versioning\VersionListener::class => \Zend\ServiceManager\Factory\InvokableFactory::class,
    ],
],

ZF2 Events

zf-versioning provides no new events, but does provide 4 distinct listeners:

ZF\Versioning\PrototypeRouteListener

This listener is attached to ModuleEvent::EVENT_MERGE_CONFIG. It is responsible for iterating the routes provided in the zf-versioning.uri configuration to look for corresponding routes in the router.routes configuration. When a match is detected, this listener will apply the versioning route match configuration to the route configuration.

ZF\Versioning\VersionListener

This listener is attached to the MvcEvent::EVENT_ROUTE at a priority of -41. This listener is responsible for updating controller service names that utilize a versioned namespace naming scheme. For example, if the currently matched route provides a controller name such as Foo\V1\Bar, and the currently selected version through URL or media type is 4, then the controller service name will be updated in the route matches to Foo\V4\Bar;

ZF\Versioning\AcceptListener

This listener is attached to the MvcEvent::EVENT_ROUTE at a priority of -40. This listener is responsible for parsing out information from the provided regular expressions (see the content-type configuration key for details) from any Accept header that is present in the request, and assigning that information to the route match, with the regex parameter names as keys.

ZF\Versioning\ContentTypeListener

This listener is attached to the MvcEvent::EVENT_ROUTE at a priority of -40. This listener is responsible for parsing out information from the provided regular expressions (see the content-type configuration key for details) from any Content-Type header that is present in the request, and assigning that information to the route match, with the regex parameter names as keys.

ZF2 Services

zf-versioning provides no unique services other than those that serve the purpose of event listeners, namely:

ZF\Versioning\VersionListener
ZF\Versioning\AcceptListener
ZF\Versioning\ContentTypeListener