lib/errors/oauth-error.js
function OAuthError(messageOrError, properties) {
  var message = messageOrError instanceof Error ? messageOrError.message : messageOrError;
  var error = messageOrError instanceof Error ? messageOrError : null;
  if (_.isEmpty(properties))
  {
    properties = {};
  }

  _.defaults(properties, { code: 500 });

  if (error) {
    properties.inner = error;
  }
  if (_.isEmpty(message)) {
    message = statuses[properties.code];
  }
  this.code = this.status = this.statusCode = properties.code;
  this.message = message;
  for (var key in properties) {
    if (key !== 'code') {
      this[key] = properties[key];
    }
  }
  Error.captureStackTrace(this, OAuthError);
}
function OAuthError(messageOrError, properties) {
  var message = messageOrError instanceof Error ? messageOrError.message : messageOrError;
  var error = messageOrError instanceof Error ? messageOrError : null;
  if (_.isEmpty(properties))
  {
    properties = {};
  }

  _.defaults(properties, { code: 500 });

  if (error) {
    properties.inner = error;
  }
  if (_.isEmpty(message)) {
    message = statuses[properties.code];
  }
  this.code = this.status = this.statusCode = properties.code;
  this.message = message;
  for (var key in properties) {
    if (key !== 'code') {
      this[key] = properties[key];
    }
  }
  Error.captureStackTrace(this, OAuthError);
}
Constructor.