Display interface graphs in Netbox fetched from LibreNMS.

netbox-graph.php

<?php
/*
 * Display LibreNMS interface graphs in Netbox
 *
 * 1. Upload this file into the plugin folder of LibreNMS.
 * 2. Generate an API key in LibreNMS and insert the connection details below.
 * 3. Create graphs in Netbox using the following URL scheme.
 *    https://nms.level66.network/plugins/netbox-graph.php?device={{ obj.device.name }}&interface={{ obj.name }}&duration=8h
 * 4. Save time in your daily work!
 *
 */
$lnms = Array(
	'token' => '',
	'url' => 'https://nms.level66.network/api/v0',
);

/*
 * Set Content-Type to match image type.
 *
 */
header('Content-Type: image/png');

/*
 * Check if all variables are set.
 *
 */
if(isset($_GET['device'], $_GET['interface'], $_GET['duration'])){
        /*
         * Calculate beginning of the graph.
         */
        switch($_GET['duration']){
                case '8h':
                        $from = time() - 28800;
                        break;
                case '12h':
                        $from = time() - 43200;
                        break;
                case '24h':
                        $from = time() - 86400;
                        break;
                case '1w':
                        $from = time() - 604800;
                        break;
                default:
                        $from = time() - 28800;
        }

        /*
         * Build URL to fetch data from LibreNMS.
         *
         */
        $_GET['device'] = str_replace(Array(':1', ':2', ':3', ':4', ':5', ':6', ':7', ':8'), '', $_GET['device']);
        $url = $lnms['url'] . '/devices/' . urlencode($_GET['device']) . '/ports/' . urlencode($_GET['interface']) . '/port_bits?width=780&height=200&from=' . $from;

        /*
         * Fetch data using LibreNMS api key.
         *
         */
        $curl = curl_init($url);
        curl_setopt($curl, CURLOPT_HTTPHEADER, Array('X-Auth-Token: ' . $lnms['token']));
        $response = curl_exec($curl);

        /*
         * Validate response and show graph.
         *
         */
        if(curl_getinfo($curl, CURLINFO_HTTP_CODE) == 200){
                print($response);
        }

        /*
         * Cleanup stuff.
         *
         */
        unset($url, $response, $curl, $lnms, $from);
        curl_close($curl);
}
?>

Based on your PHP script, I created a similar one in Python.
If interested: netbox-librenms-graph.py

Cool thing! I‘m actually not using the script anymore but hosting it in Python on the same server makes the whole thing more easier.