toxy/lib/rules/response-status.js

Hackable HTTP proxy to simulate server failure scenarios and network conditions

module.exports = function responseStatus (opts) {
  opts = parseOptions(opts)

  const lower = +opts.lower
  const higher = +opts.higher
  const value = +opts.value
  const range = opts.range || [200, 300]
  const include = opts.include

  return function responseStatus (req, res, next) {
    const status = res.statusCode
    if (!status) return next(null)

    if (value) {
      return next(null, !(status === value))
    }

    if (lower && higher) {
      return next(null, !(status < lower && status > higher))
    }

    if (lower) {
      return next(null, !(status < lower))
    }

    if (higher) {
      return next(null, !(status > higher))
    }

    if (include) {
      return next(null, !~include.indexOf(status))
    }

    return next(null, !inRange(range, status))
  }
}

function inRange (range, status) {
  return status >= range[0] &&
    status <= range[1]
}

function parseOptions (opts) {
  if (typeof opts === 'number') {
    return { value: opts }
  }
  if (Array.isArray(opts)) {
    return { range: opts }
  }
  return opts || {}
}