const JSEncrypt = require("jsencrypt");
var crypto_js = require("crypto-js");

const encrypt = new JSEncrypt();
var paramPublicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCvxXa98E1uWXnBzXkS2yHUfnBM6n3PCwLdfIox03T91joBvjtoDqiQ5x3tTOfpHs3LtiqMMEafls6b0YWtgB1dse1W5m+FpeusVkCOkQxB4SZDH6tuerIknnmB/Hsq5wgEkIvO5Pff9biig6AyoAkdWpSek/1/B7zYIepYY0lxKQIDAQAB";
encrypt.setPublicKey(paramPublicKey);

function MD5(text) {
    return crypto_js.MD5(text).toString();
}

function getUuid() {
    var s = [];
    var hexDigits = "0123456789abcdef";
    for (var i = 0; i < 32; i++) {
        s[i] = hexDigits.substr(Math.floor(Math.random() * 16), 1)
    }
    s[14] = "4";
    s[19] = hexDigits.substr(s[19] & 3 | 8, 1);
    s[8] = s[13] = s[18] = s[23];
    var uuid = s.join("");
    return uuid
}

function beforeSend(page) {
    var timestamp = Date.parse(new Date);
    var requestId = getUuid();

    var data = `{"limit":"20","page":"${page}"}`
    const sign = MD5(data + requestId + timestamp)
    return {
        timestamp: timestamp,
        requestId: requestId,
        sign: sign,
        data: encrypt.encrypt(data)
    };
}


function aes_decrypt(encrypt_data) {
    var key = crypto_js.enc.Utf8.parse("C8EB5514AF5ADDB94B2207B08C66601C");
    var iv = crypto_js.enc.Utf8.parse("55DD79C6F04E1A67");
    var decrypted = crypto_js.AES.decrypt(encrypt_data, key, {
        iv: iv,
        mode: crypto_js.mode.CBC,
        padding: crypto_js.pad.Pkcs7,
    })
    return decrypted.toString(crypto_js.enc.Utf8);
}

// console.log(beforeSend(1));