Function getParamFromRequest

packages/rest/src/parser.ts:105–123

(
  spec: ParameterObject,
  request: Request,
  pathParams: PathParameterValues,
)

}

function getParamFromRequest(
  spec: ParameterObject,
  request: Request,
  pathParams: PathParameterValues,
) {
  switch (spec.in) {
    case 'query':
      return request.query[spec.name];
    case 'path':
      return pathParams[spec.name];
    case 'header':
      // @jannyhou TBD: check edge cases
      return request.headers[spec.name.toLowerCase()];
    // TODO(jannyhou) to support `cookie`,
    // see issue https://github.com/loopbackio/loopback-next/issues/997
    default:
      throw RestHttpErrors.invalidParamLocation(spec.in);
  }
}