Example of configuring `li3_resources` queries to automatically extract values from request parameters, with fallbacks to default values. **Note:** exposing elements of a query to arbitrary input (i.e., high query limits) is not advisable. The needs and context of the application should always be considered, and input should be filtered and/or s…

action.php

<?php
/**
 * Snippet extracted from `config/bootstrap/action.php`.
 */

/**
 * ## Mapping HTTP Request Parameters to Query Parameters
 *
 * The `$replacer` function is used by the `Resources` filter below to allow resource classes to
 * automatically map values from the `Request` object in their query configurations.
 *
 * For example, a resource object may specify a limit on a query by doing the following:
 *
 *     protected $_parameters = [
 *         'index' => ['items' => ['call' => ['limit' => 'query:limit | 10']]]
 *     ];
 *
 * In this example, the `index()` method of the resource would query the `Items` model with a
 * default limit of 10 documents. However, an HTTP request could override this by appending
 * `?limit=11` to the URL.
 */
$replacer = function($request, array $data) use (&$replacer) {
	foreach ($data as $key => $value) {
		if (is_array($value)) {
			$data[$key] = $replacer($request, $value);
			continue;
		}
		if (is_string($value) && preg_match('/^(params|data|query):.+/', $value)) {
			list($getter, $default) = array_map('trim', explode('|', $value) + ['', '']);

			if (($value = $request->get($getter)) === null) {
				$value = strtotime($default) ?: $default;
			}
		}
		$data[$key] = $value;
	}
	return $data;
};


Resources::applyFilter('get', function($self, $params, $chain) use ($replacer) {
	/**
	 * Get parameters and process the query configuration through `$replacer`.
	 */
	$params['options']['call'] = $replacer($params['request'], (array) $params['options']['call']);
	return $chain->next($self, $params, $chain);
});