<?php
/**
 * Returns true if GoatCounter should process the current request.
 *
 * @return bool true if GoatCounter should process the current request
 */
function goatcounter_should_process(): bool
{
    if (!is_readable(".goat.token") || !is_readable(".goat.url")) return false;

    if (is_readable(".goat.ignore")) {
        $ignored_ips = file(".goat.ignore", FILE_IGNORE_NEW_LINES);
        if (in_array($_SERVER["REMOTE_ADDR"], $ignored_ips)) return false;
    }

    if (isset($_SERVER["HTTP_USER_AGENT"])
        && preg_match("/bot|crawl|slurp|spider|mediapartners/i", $_SERVER["HTTP_USER_AGENT"])) return false;

    return true;
}


/**
 * Sends a request to this website's GoatCounter server to record a hit.
 *
 * @param $path string the path to record a hit for
 */
function goatcounter_record_hit(string $path)
{
    if (!goatcounter_should_process()) return;


    $token = str_replace(["\r\n", "\r", "\n"], "", file_get_contents(".goat.token"));
    $url = str_replace(["\r\n", "\r", "\n"], "", file_get_contents(".goat.url"));
    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS,
        json_encode(array(
            "hits" => array(array(
                "path" => $path,
                "ip" => $_SERVER["REMOTE_ADDR"],
                "ref" => $_SERVER["HTTP_REFERER"] ?? "",
                "user_agent" => $_SERVER["HTTP_USER_AGENT"]
            ))
        ))
    );
    curl_setopt($ch, CURLOPT_HTTPHEADER,
        array(
            "Content-Type: application/json",
            "Authorization: Bearer $token"
        )
    );

    curl_exec($ch);
    curl_close($ch);
}