Node.js script for generating Link Peek urls

linkpeek.js

function linkPeek(apiKey, secret) {
  return function getUrl(uri, queryParams) {
    queryParams = Object.assign({
      size: 'original'
    }, queryParams)

    const token = md5(secret + uri + queryParams.size)
    const extraParams = queryParams && Object.keys(queryParams).map(param => `${param}=${encodeURIComponent(queryParams[param])}`).join('&')

    return `https://linkpeek.com/api/v1?uri=${encodeURIComponent(uri)}&apikey=${apiKey}&token=${token}${extraParams ? `&${extraParams}` : ''}`
  }

  function md5(string) {
    return require('crypto').createHash('md5').update(string).digest("hex")
  }
}

// Usage:
// linkPeek('apikey', 'secret')('http://url.com', { size: '100x100' })