exports.createPresignedURL = function()

in lib/aws-signature-v4.js [107:165]
55 lines of code
13 McCabe index (conditional complexity)

exports.createPresignedURL = function (
  method,
  host,
  path,
  service,
  payload,
  options
) {
  options = options || {};
  options.key = options.key || process.env.AWS_ACCESS_KEY_ID;
  options.secret = options.secret || process.env.AWS_SECRET_ACCESS_KEY;
  options.protocol = options.protocol || "https";
  options.headers = options.headers || {};
  options.timestamp = options.timestamp || Date.now();
  options.region = options.region || process.env.AWS_REGION || "us-east-1";
  options.expires = options.expires || 86400; // 24 hours
  options.headers = options.headers || {};

  // host is required
  options.headers.Host = host;

  var query = options.query ? querystring.parse(options.query) : {};
  query["X-Amz-Algorithm"] = "AWS4-HMAC-SHA256";
  query["X-Amz-Credential"] =
    options.key +
    "/" +
    exports.createCredentialScope(options.timestamp, options.region, service);
  query["X-Amz-Date"] = toTime(options.timestamp);
  query["X-Amz-Expires"] = options.expires;
  query["X-Amz-SignedHeaders"] = exports.createSignedHeaders(options.headers);
  if (options.sessionToken) {
    query["X-Amz-Security-Token"] = options.sessionToken;
  }

  var canonicalRequest = exports.createCanonicalRequest(
    method,
    path,
    query,
    options.headers,
    payload
  );
  var stringToSign = exports.createStringToSign(
    options.timestamp,
    options.region,
    service,
    canonicalRequest
  );
  var signature = exports.createSignature(
    options.secret,
    options.timestamp,
    options.region,
    service,
    stringToSign
  );
  query["X-Amz-Signature"] = signature;
  return (
    options.protocol + "://" + host + path + "?" + querystring.stringify(query)
  );
};