message: improvement(middleware-joi): use joi's detail message
diff: @@ -12,6 +12,12 @@ import {
  map
  } from 'rxjs/operators';
  +const isJoiValidationError = (
  + err: Joi.ValidationError | Error
  +): err is Joi.ValidationError => {
  + return (<Joi.ValidationError>err).isJoi === true;
  +};
  +
  const validateSource = (req: HttpRequest, rules: Map<string, any>, options) =>
  from(rules.keys()).pipe(
  mergeMap(rule =>
  @@ -19,9 +25,12 @@ const validateSource = (req: HttpRequest, rules: Map<string, any>, options) =>
  flatMap(item =>
  from(Joi.validate(item || {}, rules.get(rule), options))
  ),
  - catchError((err: Error) =>
  - throwError(new HttpError(err.message, HttpStatus.BAD_REQUEST))
  - ),
  + catchError((err: Joi.ValidationError | Error) => {
  + const message = isJoiValidationError(err)
  + ? err.details[0].message
  + : err.message;
  + return throwError(new HttpError(message, HttpStatus.BAD_REQUEST));
  + }),
  map(result => (req[rule] = result))
  )
  ),
  