Wordpress JSON-API support for Sencha Ext.Store filters

wp-jsonapi-sencha-filters.php

<?php

// Wordpress JSON-API support for Sencha Ext.Store filters
// https://gist.github.com/krava/6683621
add_action('json_api-core-get_recent_posts', 'wapp_customize_get_recent_posts');
function wapp_customize_get_recent_posts() {
        // filter: [{"property":"category","value":"1"},...] -> cat=:id, ...
        global $wp_query;
        if (isset($_GET['filter'])) {
                $filter = json_decode(stripslashes($_GET['filter']));
                foreach ($filter as $singleFilter) {
                        $property = $singleFilter->property;
                        $value = $singleFilter->value;
                        switch ($property) {
                                case 'category':
                                        $wp_query->query['cat'] = $value;
                                        break;
                                case 'fromDate':
                                        $wp_query->query['date_from'] = $value;
                                        break;
                                case 'toDate':
                                        $wp_query->query['date_to'] = $value;
                                        break;
                                default:
                                        die("Unknown filter: $property");
                        }
                }
        }
}