fetcher.js

const zip       = require('zip')
    , fetchHttp = require('./fetch-http')

function unzip (zipEntry, buffer) {
  var reader = zip.Reader(buffer)
    , data   = null

  // iterate through zipfile entries looking for the right name
  reader.forEach(function(entry) {
    if (zipEntry === entry._header.file_name) {
      data = entry._stream.toString();
    }
  })
  return data
}

function fetch (sourceUrl, zipEntry, callback) {
  fetchHttp(
      sourceUrl
    , { headers: { 'User-Agent': 'microjs.com-build-script' } }
    , function (err, content) {
        if (err)
          return callback(err)

        if (zipEntry) {
          try {
            content = unzip(zipEntry, content)
          } catch (e) {
            return callback('unzip error' + e)
          }

          if (!content)
            return callback('could not find entry ' + zipEntry + ' inside zip file')
        }

        callback(null, content.toString())
      })
}

module.exports = fetch