const crypto = require('crypto');

function sha256Hash(input) {
    return crypto.createHash('sha256').update(input).digest('hex');
}

function get_signature(keyword, page) {
    // 获取当前时间戳
    const u = new Date().getTime();
    
    // 生成随机字符串
    function generateRandomString(e, t, r) {
        let n = "";
        let i = t;
        const a = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        if (e) {
            i = Math.round(Math.random() * (r - t)) + t;
        }
        for (let o = 0; o < i; o++) {
            n += a[Math.round(Math.random() * (a.length - 1))];
        }
        return n;
    }

    const l = generateRandomString(false, 16);
    
    // 将输入参数排序并连接成字符串
    const inputStr = [u, l, '$d6eb7ff91ee257475%', keyword, 10, page].sort().join("");
    
    // 使用 SHA-256 算法生成签名
    const signature = sha256Hash(inputStr);
    
    return {
        'ts': u,
        'rs': l,
        'signature': signature
    };
}