function generateBlobSASQueryParameters20201206()

in sdk/storage/storage-file-datalake/src/sas/DataLakeSASSignatureValues.ts [846:959]
105 lines of code
22 McCabe index (conditional complexity)

function generateBlobSASQueryParameters20201206(
  dataLakeSASSignatureValues: DataLakeSASSignatureValues,
  sharedKeyCredential: StorageSharedKeyCredential,
): { sasQueryParameter: SASQueryParameters; stringToSign: string } {
  if (
    !dataLakeSASSignatureValues.identifier &&
    !(dataLakeSASSignatureValues.permissions && dataLakeSASSignatureValues.expiresOn)
  ) {
    throw new RangeError(
      "Must provide 'permissions' and 'expiresOn' for Blob SAS generation when 'identifier' is not provided.",
    );
  }

  const version = dataLakeSASSignatureValues.version
    ? dataLakeSASSignatureValues.version
    : SERVICE_VERSION;

  dataLakeSASSignatureValues = SASSignatureValuesSanityCheckAndAutofill(
    dataLakeSASSignatureValues,
    version,
  );

  let resource: string = "c";
  if (dataLakeSASSignatureValues.pathName) {
    if (dataLakeSASSignatureValues.isDirectory) {
      resource = "d";
    } else {
      resource = "b";
      if (dataLakeSASSignatureValues.snapshotTime) {
        resource = "bs";
      }
    }
  }

  // Calling parse and toString guarantees the proper ordering and throws on invalid characters.
  let verifiedPermissions: string | undefined;
  if (dataLakeSASSignatureValues.permissions) {
    if (dataLakeSASSignatureValues.pathName) {
      if (dataLakeSASSignatureValues.isDirectory) {
        verifiedPermissions = DirectorySASPermissions.parse(
          dataLakeSASSignatureValues.permissions.toString(),
        ).toString();
      } else {
        verifiedPermissions = DataLakeSASPermissions.parse(
          dataLakeSASSignatureValues.permissions.toString(),
        ).toString();
      }
    } else {
      verifiedPermissions = FileSystemSASPermissions.parse(
        dataLakeSASSignatureValues.permissions.toString(),
      ).toString();
    }
  }

  // Signature is generated on the un-url-encoded values.
  const stringToSign = [
    verifiedPermissions ? verifiedPermissions : "",
    dataLakeSASSignatureValues.startsOn
      ? truncatedISO8061Date(dataLakeSASSignatureValues.startsOn, false)
      : "",
    dataLakeSASSignatureValues.expiresOn
      ? truncatedISO8061Date(dataLakeSASSignatureValues.expiresOn, false)
      : "",
    getCanonicalName(
      sharedKeyCredential.accountName,
      dataLakeSASSignatureValues.fileSystemName,
      dataLakeSASSignatureValues.pathName,
    ),
    dataLakeSASSignatureValues.identifier,
    dataLakeSASSignatureValues.ipRange ? ipRangeToString(dataLakeSASSignatureValues.ipRange) : "",
    dataLakeSASSignatureValues.protocol ? dataLakeSASSignatureValues.protocol : "",
    version,
    resource,
    dataLakeSASSignatureValues.snapshotTime,
    dataLakeSASSignatureValues.encryptionScope ? dataLakeSASSignatureValues.encryptionScope : "",
    dataLakeSASSignatureValues.cacheControl ? dataLakeSASSignatureValues.cacheControl : "",
    dataLakeSASSignatureValues.contentDisposition
      ? dataLakeSASSignatureValues.contentDisposition
      : "",
    dataLakeSASSignatureValues.contentEncoding ? dataLakeSASSignatureValues.contentEncoding : "",
    dataLakeSASSignatureValues.contentLanguage ? dataLakeSASSignatureValues.contentLanguage : "",
    dataLakeSASSignatureValues.contentType ? dataLakeSASSignatureValues.contentType : "",
  ].join("\n");

  const signature = sharedKeyCredential.computeHMACSHA256(stringToSign);

  return {
    sasQueryParameter: new SASQueryParameters(
      version,
      signature,
      verifiedPermissions,
      undefined,
      undefined,
      dataLakeSASSignatureValues.protocol,
      dataLakeSASSignatureValues.startsOn,
      dataLakeSASSignatureValues.expiresOn,
      dataLakeSASSignatureValues.ipRange,
      dataLakeSASSignatureValues.identifier,
      resource,
      dataLakeSASSignatureValues.cacheControl,
      dataLakeSASSignatureValues.contentDisposition,
      dataLakeSASSignatureValues.contentEncoding,
      dataLakeSASSignatureValues.contentLanguage,
      dataLakeSASSignatureValues.contentType,
      undefined,
      dataLakeSASSignatureValues.directoryDepth,
      undefined,
      undefined,
      undefined,
      dataLakeSASSignatureValues.encryptionScope,
    ),
    stringToSign: stringToSign,
  };
}