如何修复'TypeError：当使用ibm-cos-sdk时，Key必须是新Hmac（crypto.js：117：16）的缓冲区

Question

我尝试根据为@cloudant/couchbackup包提供的示例代码对IBM COS执行Cloudant备份，并从依赖的Hmac包接收错误：“TypeError：Key必须是新Hmac的缓冲区（crypto.js：117：16） ”。

我调整了示例代码以使用我的特定源（Cloudant）和目标（COS）凭据，并使示例代码的其他部分保持不变。在Ubuntu（在Virtual Box上）和在Windows 10上运行它的结果是相同的。对其他测试脚本的一般访问Cloudant和COS都是如此。

我的server.js：

const stream = require('stream');
const url = require('url');

const IbmCos = require('ibm-cos-sdk');
const couchbackup = require('@cloudant/couchbackup');
const debug = require('debug')('s3-backup');
const VError = require('verror').VError;

// COS properties 
const ibmAuthEndpointUrl = 'https://iam.ng.bluemix.net/oidc/token';
var backupBucket = process.env.COS_BUCKET;

var s3config = {
    endpoint: process.env.COS_ENDPOINT,
    apiKeyId: process.env.COS_API_KEY,
    ibmAuthEndpoint: ibmAuthEndpointUrl,
    serviceInstanceId: process.env.COS_RES_INST,
};

// Cloudant properties
const sourceUrl = process.env.COUCH_URL;
const sourceDbName = process.env.COUCH_DATABASE;
const sourceUrlExt = sourceUrl + '/' + sourceDbName;
const shallow = false;

// Create the COS client for the configuration:
var ibmS3Client = new IbmCos.S3(s3config);

const backupKeyPrefix = "A";
const backupKey = `${backupKeyPrefix}-${new Date().toISOString()}`;
debug(`Creating a new backup of ${s(sourceUrlExt)} at ${backupBucket}/${backupKey}...`);

bucketAccessible(ibmS3Client, backupBucket)
    .then(() => {
        return backupToS3(sourceUrlExt, ibmS3Client, backupBucket, backupKey, shallow);
    })
    .then(() => {
        debug('done.');
    })
    .catch((reason) => {
        debug(`Error: ${reason}`);
        process.exit(1);
    });

上面代码的主要部分和函数bucketAccessible，backupToS3和s来自示例script。

运行server.js我希望从Cloudant导出的文本文件存储在COS中。但是，这是我得到的错误：

$ DEBUG=s3-backup node server.js
  s3-backup Creating a new backup of https://<mytenant>-bluemix.cloudant.com/test-48hg at dch-48h-backup01/A-2019-02-13T13:28:38.719Z... +0ms
  s3-backup Setting up S3 upload to ${s3Bucket}/${s3Key} +1s
  s3-backup Starting streaming data from ${sourceUrl} +1ms
  s3-backup Download from ${sourceUrl} complete. +717ms
  s3-backup S3 upload done +5ms
  s3-backup TypeError: Key must be a buffer
  s3-backup     at new Hmac (crypto.js:117:16)
  s3-backup     at Object.createHmac (crypto.js:643:10)
  s3-backup     at Object.hmac (C:\Users\StefanVogel\Documents\GitHub\48hg-backup\node_modules\ibm-cos-sdk\lib\util.js:400:30)
  s3-backup     at Object.getSigningKey (C:\Users\StefanVogel\Documents\GitHub\48hg-backup\node_modules\ibm-cos-sdk\lib\signers\v4_credentials.js:59:8)
  s3-backup     at V4.signature (C:\Users\StefanVogel\Documents\GitHub\48hg-backup\node_modules\ibm-cos-sdk\lib\signers\v4.js:95:36)
  s3-backup     at V4.authorization (C:\Users\StefanVogel\Documents\GitHub\48hg-backup\node_modules\ibm-cos-sdk\lib\signers\v4.js:90:36)
  s3-backup     at V4.addAuthorization (C:\Users\StefanVogel\Documents\GitHub\48hg-backup\node_modules\ibm-cos-sdk\lib\signers\v4.js:32:12)
  s3-backup     at C:\Users\StefanVogel\Documents\GitHub\48hg-backup\node_modules\ibm-cos-sdk\lib\event_listeners.js:199:18
  s3-backup     at finish (C:\Users\StefanVogel\Documents\GitHub\48hg-backup\node_modules\ibm-cos-sdk\lib\config.js:308:7)
  s3-backup     at C:\Users\StefanVogel\Documents\GitHub\48hg-backup\node_modules\ibm-cos-sdk\lib\config.js:324:9 +0ms
  s3-backup Error: Error: S3 upload failed +2ms

我尝试使用file而不是示例脚本的stream版本，仍然有相同的错误。

Answer 1

显然，ibm-cos-sdk安装不正确。运行npm install ibm-cos-sdk后，它工作正常。不确定为什么const IbmCos = require('ibm-cos-sdk');是不够的。也许对于知识渊博的人来说这是另一个问题（不是我当然）。

我还设法使用aws-sdk运行相同的脚本，稍微修改了实例化客户端。