Advanced Content Validation

Custom input filters

Content forthcoming. Topics:

  • Registering custom input filters with zf-content-validation.
  • Registering custom filters and validators.
  • Providing metadata for custom filters and validators so that they will display in the admin UI.

Method-specific input filters

Your service may require different input filters based on the HTTP method called. As an example from the Apigility Admin API, creating a service (POST request) only requires a field or two; updating a service (PATCH and/or PUT request), however, may require dozens of fields.

zf-content-validation provides:

  • The ability to define a "fallback" input filter for a service, to be used for any HTTP request method that does not have a specific input filter defined.
  • The ability to define an input filter per HTTP request method.

The latter capability is only provided via manual configuration at this time.

zf-content-validation configuration has the following structure:

    'zf-content-validation' => [
        'Controller Service Name' => [
            'input_filter' => 'input filter service to use if no method specific filter available',
            'PATCH' => 'input filter service for PATCH requests',
            'POST' => 'input filter service for POST requests',
            'PUT' => 'input filter service for PUT requests',
            'GET' => 'input filter service for GET requests',

The values for each key must be a valid input filter as defined either in the input_filter_specs configuration (which is what the Apigility Admin UI manipulates), or a valid input filter service registered with the input_filters configuration (or within the getInputFilterConfig() method of a Zend Framework module).

Since version 1.5.0 of zf-content-validation, when a GET request is made, the input filter element keys are used as a query whitelist, and merged with those in the admin UI if any exist.

Provide only the configuration you need; for instance, if your PATCH and PUT requests use the same input filter, define that in the input_filter key, and then define only your POST input filter separately:

    'zf-content-validation' => [
        'AddressBook\V1\Rest\Contact\Controller' => [
            'input_filter' => 'AddressBook\V1\Rest\Contact\Validator',
            'POST' => 'AddressBook\V1\Rest\Contact\NewContactValidator',