/**
 * 彩虹易支付 Node.js SDK 示例
 * 文档: https://xxkkfz.cn/apidoc.html
 */
const crypto = require('crypto');
const https = require('https');
const querystring = require('querystring');

function epaySubmit(params, merchantKey) {
    // 排序并签名
    const sorted = {};
    Object.keys(params).sort().forEach(k => {
        if (k !== 'sign' && k !== 'sign_type' && params[k] !== '') {
            sorted[k] = params[k];
        }
    });
    const signStr = querystring.stringify(sorted);
    params.sign = crypto.createHash('md5').update(signStr + merchantKey).digest('hex');
    params.sign_type = 'MD5';
    
    // 请求接口
    const postData = querystring.stringify(params);
    const options = {
        hostname: 'xxkkfz.cn',
        path: '/api/submit.php',
        method: 'POST',
        headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
    };
    
    return new Promise((resolve, reject) => {
        const req = https.request(options, res => {
            let body = '';
            res.on('data', chunk => body += chunk);
            res.on('end', () => resolve(JSON.parse(body)));
        });
        req.on('error', reject);
        req.write(postData);
        req.end();
    });
}

// 使用示例
epaySubmit({
    pid: '1001',
    type: 'alipay',
    out_trade_no: 'ORDER' + Date.now(),
    notify_url: 'https://你的域名/notify',
    return_url: 'https://你的域名/return',
    name: '测试商品',
    money: '0.01'
}, '你的商户密钥').then(console.log);