node保存远程图片到本地

readImage.coffee

async.waterfall [
  (callback) ->
    op = {
      url:self.url
      encoding:'binary'
    }
    request.get op, (err, res, body) ->
      return console.log err if err

      mimeType = res.headers['content-type']
      mimeType = mimeType.split(';')[0]
      image = new Buffer(body, 'binary')
      callback(null, image, mimeType)

  (image, mimeType, callback) ->
    baseDir = __dirname + '/static'
    checkTime = getLocalTime(self.deviceInfo.check_time)
    locationTime = getLocalTime(self.deviceInfo.location_time)
    fileRes = baseDir + '/' + checkTime + '/' + locationTime + MIME_TO_EXTESION_MAPPING[mimeType]
    dir = baseDir + '/' + checkTime
    if !fs.existsSync(dir)
      fs.mkdirSync(dir)

    fs.writeFileSync fileRes, image
    console.log "write ok"

]


# https://app.yinxiang.com/shard/s5/nl/341662775/e5ee0420-ee00-4221-a8d3-078b176ed318/
# https://app.yinxiang.com/shard/s5/nl/341662775/c8a364f2-b0a2-4ebf-b466-4749b652b1e1/