读取淘客链接对应的商品ID

taoke_to_itemid.js

function findItemIdByTaokeLink(u, cb) {
  console.log('GET %s', u)
  request.head({
      url: u
  }, function(err, res) {
    if (err) return cb(err)
    console.log('%s %s', res.statusCode, u)
    
    var iid = res.headers['at_itemid']
    if (iid) return cb(null, iid)
  
    var eu = require('querystring').parse(require('url').parse(res.request.href).query).tu
    console.log('GET', eu)
    request.head({
        url: eu
      , headers: {
          Referer: res.request.href
        }
    }, function(err, res) {
      if (err) return cb(err)
      console.log('%s %s', res.statusCode, u)
      
      var iid = res.headers['at_itemid']
      if (iid) return cb(null, iid)
      return cb(new Error('failed to find itemid from this link: ' + u))
    })
  })
}

var u = 'http://s.click.taobao.com/t?e=zGU34CA7K%2BPkqB07S4%2FK0CITy7klxn%2Fr3HZwuuY0VC7BwYOFXUacZzJSTyxeNTKnaTn%2FpS4H9PWTm%2B3LEL1G1C4bUHfRJ8XB%2BLmzokDYziSKBmVXTUBKBhwpTHhaZclHAGqqTrsA5kJ3T2MdT6F1EFOF9TKweNo8oURFVnVPpgXUj7lKMgS0AoM6FYvobEdWoqhbKA%3D%3D&unid=513f11b7328a8&spm=2014.12425299.1.0'
findItemIdByTaokeLink(u, function() {
  console.log(arguments)
})