Function signS3Request

src/background/sync/s3.js:65–109

({
  method,
  endpoint,
  pathSegments,
  queryParams = {},
  body = null,
  accessKeyId,
  secretKey,
  region,
})

}

async function signS3Request({
  method,
  endpoint,
  pathSegments,
  queryParams = {},
  body = null,
  accessKeyId,
  secretKey,
  region,
}) {
  const now = new Date();
  const amzDate = now.toISOString().replace(/[:-]|\.\d{3}/g, '');
  const datestamp = amzDate.slice(0, 8);

  const canonicalUri = '/' + pathSegments.map(encodeSegment).join('/');
  const sortedParams = Object.entries(queryParams)
    .sort(([a], [b]) => a < b ? -1 : a > b ? 1 : 0);
  const canonicalQS = sortedParams
    .map(([k, v]) => `${encodeSegment(k)}=${encodeSegment(v)}`)
    .join('&');
  const url = `${endpoint}${canonicalUri}${canonicalQS ? `?${canonicalQS}` : ''}`;
  const host = new URL(url).host;

  const EMPTY_HASH = 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855';
  const payloadHash = body != null ? await sha256hex(body) : EMPTY_HASH;

  const reqHeaders = {
    host,
    'x-amz-content-sha256': payloadHash,
    'x-amz-date': amzDate,
  };
  const sortedNames = Object.keys(reqHeaders).sort();
  const canonicalHeaders = sortedNames.map(k => `${k}:${reqHeaders[k]}\n`).join('');
  const signedHeaders = sortedNames.join(';');

  const canonicalRequest = [method, canonicalUri, canonicalQS, canonicalHeaders, signedHeaders, payloadHash].join('\n');
  const credentialScope = `${datestamp}/${region}/s3/aws4_request`;
  const stringToSign = ['AWS4-HMAC-SHA256', amzDate, credentialScope, await sha256hex(canonicalRequest)].join('\n');

  const signingKey = await getSigningKey(secretKey, datestamp, region);
  const signature = toHex(await hmacSha256(signingKey, stringToSign));

  reqHeaders['Authorization'] = `AWS4-HMAC-SHA256 Credential=${accessKeyId}/${credentialScope}, SignedHeaders=${signedHeaders}, Signature=${signature}`;
  return { url, headers: reqHeaders };
}

function parseListXml(xml) {
  const doc = new DOMParser().parseFromString(xml, 'application/xml');