@opengis/fastify-table/server/plugins/file/providers/utils/getValidData.js

core-plugins

import isText from './typeguards/isText.js';
import isPath from './typeguards/isPath.js';
import isBuffer from './typeguards/isBuffer.js';
import isReadableStream from './typeguards/isReadableStream.js';
import isArray from './typeguards/isArray.js';

import convertHandlers from './handlers/index.js';

const getValidData = async ({ data, types }) => {
  // chain of responsibility
  const validators = [isReadableStream, isBuffer, isPath, isText, isArray];

  const values = await Promise.all(
    validators.map(async (func) => ({ name: func.name, bool: await func(data) })),
  );
  const isValid = !values.reduce((acc, { name, bool }) => {
    let valid = false;
    types.forEach((dataType) => {
      if (name === dataType) valid = bool;
    });
    return acc && !valid;
  }, true);
  if (isValid) return data;

  const [value] = values.filter(({ bool }) => bool === true);
  if (!value) throw new Error('No support for this data type');

  const handler = convertHandlers[value.name];
  return handler({ data, types });
};

export default getValidData;