datasets.php

<?php
require_once(__DIR__ . "/ks-datasets-database.php");

$EMPTY_SPACE = '{"links":[],"nodes":[]}';

add_action("wp_ajax_get_space", "ks_get_space"); // Fires only for logged-in-users
add_action("wp_ajax_nopriv_get_space", 'ks_get_space' ); // Fires for everyone
function ks_get_space() {
    $name = ks_escape_space_name($_POST["space"]);

    $space = ks_select_space($name);

    // If it doesn't exist, create new empty space
    if ($space == NULL) {
        global $EMPTY_SPACE;
        ks_insert_space($name, $EMPTY_SPACE);
        $space = ks_select_space($name);
    }

    echo $space->graph;

    wp_die();
}

add_action("wp_ajax_list_spaces", "ks_list_spaces"); // Fires only for logged-in-users
function ks_list_spaces() {
    $spaces = array();
    foreach (ks_select_all_spaces() as $space) {
        $spaces[] = $space->name;
    }
    
    $payload = array("spaces" => $spaces);
    echo json_encode($payload);

    wp_die();
}

add_action("wp_ajax_update_space", "ks_update_space"); // Fires only for logged-in-users
//add_action("wp_ajax_nopriv_update_space", 'update_space' ); // Fires for everyone
function ks_update_space() {
    // Check user capabilities
    if (current_user_can("edit_posts")) {
        // Use json encoding.
        $graph = stripslashes($_POST["graph"]);
        $name = ks_escape_space_name($_POST["space"]);

        ks_insert_or_update_graph($name, $graph);

        wp_die();
    } else {
        echo "Insufficient permissions!";
    }
}

function ks_escape_space_name($space_name) {
    // Cleaning up the space id
    $space_name = str_replace("/", "-", $space_name);
    $space_name = str_replace("\\", "-", $space_name);
    $space_name = str_replace(".", "-", $space_name);
    $space_name = str_replace(";", "-", $space_name);
    $space_name = str_replace(":", "-", $space_name);
    $space_name = str_replace(",", "-", $space_name);
    return strtolower($space_name);
}