Return traffic inspection (session) JSON of current NGROK environment

get-ngrok-session.php

<?php

/**
 * Return JSON traffic inspection (just the session part) of current NGROK (https://ngrok.com/docs) environment
 * @author Alexander Gailey-White
 *
 * Example data:
 * {
		"Session": {
			"Status": 1,
			"LastError": "",
			"Version": "prod",
			"Tunnels": {
				"foobar": {
					"URL": "https:\/\/xxxxxxxxxxxxx.ngrok.io",
					"Proto": "https",
					"Metrics": ...,
					"Session": ...
				},
				"Config": {
					"name": "foobar",
					"inspect": true,
					"addr": "localhost:8080",
					"Subdomain": "",
					"Hostname": "",
					"Auth": "",
					"HostHeader": "",
					"BindTLS": "both"
				}
			},
			...
		}
 */

$return = false;

// Get NGROK traffic inspection
$ch = curl_init();
curl_setopt_array($ch, [
	CURLOPT_URL => 'http://localhost:4040/inspect/http',
	CURLOPT_HEADER => false,
	CURLOPT_FOLLOWLOCATION => true,
	CURLOPT_RETURNTRANSFER => true
]);

// Empty response
if (($raw = curl_exec($ch)) !== false) {

	// Response info
	$response = curl_getinfo($ch);
	curl_close($ch);
}

// Fall-back to ./ngrok.txt
if (empty($raw) || $response['http_code'] <> 200)
	$raw = file_get_contents('./ngrok.txt');

// We have some data
if (!empty($raw)) {

	// Look for HTML escaped JSON strings
	preg_match_all('#JSON.parse\(\"(.*)\"\)#i', $raw, $matches);

	// Matches
	if (count($matches) && array_key_exists(1, $matches)) {
		$return = [];

		// Add each match to return
		foreach ($matches[1] as $i => $match) {

			// We only want the last JSON.parse block, which contains the session data.
			// The first block contains traffic data, comment the next line to include it
			if ($i)
				$return[] = json_decode(str_replace('\"', '"', $match), true);
		}
	}
}

echo json_encode($return);