<?php

namespace phpcommon;

function _internalSign($secret_key, $timestamp, $params) {
    ksort($params);
    $params_str = '';
    foreach($params as $key => $val){
        if ($key == '' ||
            $key == 'a' ||
            $key == 'c') {
            continue;
        }
        if ($key[0] == '_') {
            continue;
        }
        $params_str = $params_str . $key . '=' . $val . '&';
    }
    if($params_str != ''){
        $params_str = substr($params_str, 0, -1);
    }
    return md5($params_str . $secret_key . $timestamp);
}

function ksVerify($service_name) {
    if (!isset($_REQUEST['__timestamp']) ||
        $_REQUEST['__timestamp'] < time() - 3600 * 1) {
        return false;
    }
    if ($_REQUEST['__service_name'] != $service_name) {
        return false;
    }
    $app_name = $_REQUEST['__project_name'];
    $project_name = PROJECT_NAME;
    $filename = "../keys/provider/$service_name@$project_name.provider.json.php";
    if (!file_exists($filename)) {
        die('not found ' . $filename);
    }
    $data = file_get_contents($filename);
    if (!$data) {
        die("open file error $filename");
    }
    $jsonobj = json_decode($data, true);
    if (!isset($jsonobj[$app_name]) || !isset($jsonobj[$app_name]['secret_key'])) {
        return false;
    }

    foreach ($jsonobj[$app_name]['secret_key'] as $secret_key) {
        if (_internalSign($secret_key, $_REQUEST['__timestamp'], $_REQUEST) ==
            $_REQUEST['__sign']) {
            return true;
        }
    }
    return false;
}

function ksSign($app_name, $service_name, &$params) {
    $filename = "../keys/consumer/$service_name@$app_name.consumer.json.php";
    if (!file_exists($filename)) {
        die('not found ' . $filename);
    }
    $data = file_get_contents($filename);
    if (!$data) {
        die("open file error $filename");
    }
    $jsonobj = json_decode($data, true);
    $secret_key = $jsonobj['secret_key'];

    $timestamp = time();
    $params['__project_name'] = PROJECT_NAME;
    $params['__service_name'] = $service_name;
    $params['__timestamp'] = $timestamp;
    $params['__sign'] = _internalSign($secret_key, $timestamp, $params);
}