init project

.gitignore

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+node_modules
+*.rdb

Makefile

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+default: 
+	coffee app.coffee

Procfile

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+web: coffee app.js

app.coffee

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+express = require 'express'
+crypto = require 'crypto'
+Log = require('log')
+log = new Log('debug')
+Url = require 'url'
+
+redis = require 'redis'
+client = redis.createClient()
+
+app = express.createServer()
+
+app.set 'view engine', 'jade'
+
+app.use express.bodyParser()
+app.use express.cookieParser()
+app.use express.session secret: "asdajchklshjlawu4hvjbl"
+app.use express.static('public/')
+
+app.get '/', (req, res)->
+  res.render 'index'
+
+app.get '/register', (req, res, next)->
+  url = normalizeUrl req.query.url
+
+  return next() unless url
+
+  code = hashUrl(url)
+
+  client.set "url:#{code}", url, (err, reply)->
+    log.info "generate code #{code}"
+    req.session.code = code
+    req.session.url = url
+    res.redirect '/create'
+
+app.get '/create', (req, res)->
+  res.render 'create'
+    code: req.session.code
+
+app.get /^\/([a-zA-Z0-9]{4,6})$/, (req, res, next)->
+  code = req.params[0]
+  client.get "url:#{code}", (err, reply)->
+    return next(err) if err
+    log.info "redirect user to #{reply}"
+    client.hincrby 'hits', reply, 1
+    res.redirect reply
+
+app.listen '3000'
+
+hashUrl = (url)->
+  symbals = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'
+  length = symbals.length
+  digits = 5
+  code = ""
+
+  hash = crypto.createHash('md5')
+    .update(url)
+    .digest('hex')
+
+  hash_number = parseInt(hash, 16) % Math.pow(length, digits + 1)
+
+  while hash_number >= length
+    n = hash_number % length
+    code += symbals[n]
+    hash_number = parseInt(hash_number / length)
+
+  code
+
+normalizeUrl = (url)->
+  urlObject = Url.parse url
+  if not urlObject.protocol?
+    'http://' + urlObject.href
+  else
+    urlObject.href

package.json

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+{
+  "author": "Jimmy Chao <daizenga@gmail.com> (neethack.com)",
+  "name": "url_shortener",
+  "version": "0.0.0",
+  "repository": {
+    "url": ""
+  },
+  "main": "app.coffee",
+  "engines": {
+    "node": "~0.6.3"
+  },
+  "dependencies": {
+    "express": "~3.0.0rc1",
+    "redis": "~0.7.2",
+    "jade": "~0.26.3",
+    "crypto": "0.0.3",
+    "url": "~0.7.9",
+    "log": "~1.3.0",
+    "coffee-script": "~1.3.3"
+  },
+  "devDependencies": {}
+}