<?php

/**

 *  An example CORS-compliant method.  It will allow any GET, POST, or OPTIONS requests from any

 *  origin.

 *

 *  In a production environment, you probably want to be more restrictive, but this gives you

 *  the general idea of what is involved.  For the nitty-gritty low-down, read:

 *

 *  - https://developer.mozilla.org/en/HTTP_access_control

 *  - http://www.w3.org/TR/cors/

 *

 */

function cors() {

    // Allow from any origin

    if (isset($_SERVER['HTTP_ORIGIN'])) {

        header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");

        header('Access-Control-Allow-Credentials: true');

        header('Access-Control-Max-Age: 86400');    // cache for 1 day

    }

    // Access-Control headers are received during OPTIONS requests

    if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {

        if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))

            header("Access-Control-Allow-Methods: GET, POST, OPTIONS");

        if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))

            header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");

        exit(0);

    }

}

cors();

function ref_point_to_geoJSONFeature($name, $values) {

        return array("type" => "Feature",

                     "geometry" => array(

                                         "type" => "Point",

                                         "coordinates" => [$values[1],$values[0]]

                                         ),

                     "properties" => array("name" => $name)

                     );

}

function get_ref_points() {

        $ref_points_filename = '../ref_points.local.php';

        if (file_exists($ref_points_filename)) {

                include $ref_points_filename;

                return $ref_points;

        } else {

                return array();

        }

}

$json = array(

              "type" => "FeatureCollection",

              "features"=> array()

              );

foreach (get_ref_points() as $name => $vals) {

        $json['features'][] = ref_point_to_geoJSONFeature($name, $vals);

}

echo json_encode($json);

?>