前言

使用百度云产品，文档中，需要生成认证签名.

代码

调用百度云接口，需要在headers中添加签名（X-Bce-Signature字段）
以真人度查询接口为例（http://rtbasia.api.bdymkt.com/ipscore/query）

const apiUrl = `http://rtbasia.api.bdymkt.com/ipscore/query?ip=${ip}`;
const headers = {
        'X-Bce-Signature': getAuthString(accessKeyId, AppSecret,'/ipscore/query', ip, 'rtbasia.api.bdymkt.com'),
        'Host': 'rtbasia.api.bdymkt.com',
        'ContentType': 'application/json'
    };

function getAuthString(ak, sk, path, ip, host) {
    // 1
    const accessKeyId = ak;
    const AppSecret = sk;
    const timestamp = new Date().toISOString().replace(/\.\d*/, '');
    // const timestamp = '2020-04-10T01:41:45Z';
    const expirationPeriodInSeconds = 100;
    let authStringPrefix = `bce-auth-v1/${accessKeyId}/${timestamp}/${expirationPeriodInSeconds}`;

    // 2
    let Method = 'POST';
    let CanonicalURI = path;
    let CanonicalQueryString  = 'ip=' + ip;
    let CanonicalHeaders = 'host:'+ host;
    let CanonicalRequest = Method + '\n' + CanonicalURI + '\n' + CanonicalQueryString + '\n' + CanonicalHeaders;
    CanonicalRequest =  decodeURI(CanonicalRequest);
    let signedHeaders = 'host'; // 可根据Header部分确定签名头域（signedHeaders)。签名头域是指签名算法中涉及到的HTTP头域列表。

    // 3
    let SigningKey = crypto
        .createHmac('sha256', AppSecret) //你的secret
        .update(authStringPrefix)
        .digest()
        .toString('hex');

    // 4
    let Signature = crypto
        .createHmac('sha256', SigningKey) //你的secret
        .update(CanonicalRequest)
        .digest()
        .toString('hex');

    // 5
    let authorization = `${authStringPrefix}/${signedHeaders}/${Signature}`;
    // 打印变量 可对比 百度云在线签名生成 输出，找到错误
    console.log('1', authStringPrefix);
    console.log('2', CanonicalRequest);
    console.log('3', SigningKey);
    console.log('4', Signature);
    console.log('5', authorization);
    return authorization;
}