<?php

include("getInfo.php");

function getClientIP() { // 获取客户端IP
    return isset($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR'];
}

function formatDate($str) { // 将YYYYMMDD处理为YYYY-MM-DD
    return substr($str, 0, 4) . '-' . substr($str, 4, 2) . '-' . substr($str, 6, 2);
}

function preRount() { // 解析请求路径
    global $request;
    $requestUri = $_SERVER['DOCUMENT_URI'];
    if ($_GET['cli'] == 'true') {
        $request['cli'] = true;
    }
    if ($requestUri == '/' || $requestUri == '/ip') { // URI -> / or /ip
        $request['justip'] = true;
        return;
    } else if ($requestUri == '/version') { // URI -> /version
        $request['version'] = true;
        return;
    } else if ($requestUri == '/info') { // URI -> /info
        $request['ip'] = getClientIP();
        return;
    } else if ($requestUri == '/query') { // URI -> /query?xxx=xxx
        if ($_GET['error'] == 'true') { $request['error'] = true; }
        if ($_GET['version'] == 'true') { $request['version'] = true; }
        if ($_GET['justip'] == 'true') { $request['justip'] = true; }
        if (isset($_GET['ip'])) { $request['ip'] = $_GET['ip']; }
        return;
    }
    preg_match('#^/([^/]+?)$#', $requestUri, $match); // URI -> /{ip}
    if (count($match) > 0) {
        $request['ip'] = $match[1];
        return;
    }
    preg_match('#^/info/([^/]+?)$#', $requestUri, $match); // URI -> /info/{ip}
    if (count($match) > 0) {
        $request['ip'] = $match[1];
        return;
    }
    $request['error'] = true;
}

function routeParam() {
    // error -> 请求出错
    // version -> 获取版本数据
    // cli -> 来自命令行下的请求
    // justip -> 仅查询IP地址
    // ip -> 请求指定IP的数据

    global $request;
    if ($request['error']) { // 请求出错
        if ($request['cli']) { // 命令行模式
            echo 'Illegal Request' . PHP_EOL;
        } else {
            header('HTTP/1.1 302 Moved Temporarily');
            header('Location: /error');
        }
        exit; // 退出
    }

    if ($request['version']) { // 请求版本信息
        $version = getVersion();
        if ($request['cli']) { // 命令行模式
            echo "echoip -> " . $version['echoip'] . PHP_EOL;
            echo "qqwry.dat -> " . formatDate($version['qqwry']) . PHP_EOL;
            echo "ipip.net -> " . formatDate($version['ipip']) . PHP_EOL;
        } else {
            header('Content-Type: application/json; charset=utf-8');
            echo json_encode($version); // 返回JSON数据
        }
        exit; // 退出
    }

    if ($request['justip']) { // 仅查询IP地址
        if ($request['cli']) { // 命令行模式
            echo getClientIP() . PHP_EOL;
        } else {
            header('Content-Type: application/json; charset=utf-8');
            echo '{"ip":"' . getClientIP() . '"}'; // 返回JSON数据
        }
        exit;
    }

    $ip = isset($request['ip']) ? $request['ip'] : getClientIP(); // 若存在请求信息则查询该IP
    if (!filter_var($ip, \FILTER_VALIDATE_IP)) { // 输入IP不合法
        if ($request['cli']) { // 命令行模式
            echo "Illegal Request" . PHP_EOL;
        } else {
            $reply = array();
            $reply['status'] = 'F';
            $reply['message'] = 'Illegal Request';
            header('Content-Type: application/json; charset=utf-8');
            echo json_encode($reply);
        }
        exit;
    }
    echo getIPInfo($ip); // 查询目标IP
}

function main() {
    preRount(); // 解析请求路径
    routeParam(); // 处理请求参数
}

$myVersion = 'v1.2';
$request = array(
    'error' => false,
    'version' => false,
    'cli' => false,
    'justip' => false,
);

main();

?>