biodome/lib/validateCommand.js

Home automation you can live with

/**
 * Command format:
 *   {
 *     'selector' : {'id': 'LCD'},
 *     'instruction' : {'type': 'write', 'value': 'Hello World' }
 *   }
 */

export default function validateCommand(command) {
  // Validate Selector
  if (!command.selector) {
    return commandError('Invalid command: Missing selector');
  }
  if (typeof command.selector !== 'object') {
    return commandError('Invalid command: Invalid selector');
  }

  if (command.instruction === undefined) {
    return commandError('Invalid command: Missing instruction');
  }
  if (['read', 'write'].indexOf(command.instruction.type) === -1) {
    return commandError('Invalid command: Invalid instruction');
  }

  return {valid: true, error: null};
}

function commandError(errorMsg) {
  return {
    valid: false,
    error: errorMsg
  };
}