Single file #webkoe server written in #go :)

package main

  import (
    "github.com/go-martini/martini"
    "github.com/martini-contrib/render"
    "gopkg.in/mgo.v2"
    "gopkg.in/mgo.v2/bson"
    "net"
    "net/http"
    "fmt"
    "time"
    "crypto/rand"
    "strings"
    "regexp"
  )

  // local 
  var mongoConfig = "127.0.0.1:27017"
  var blogCollection = "webkoe_blog"
  var hostHome = "localhost:8080"
  var hostCatatan = "catatan"


  // webkoe
  // var mongoConfig = "mongodb://usermongo:passmongo@localhost:portmongo/dbmongo"
  // var blogCollection = "blog"
  // var hostHome = "webkoe.net:8080"
  // var hostCatatan = "catatan.webkoe.net"


  type Blog struct {
    Id string
    Things string
    Date string
    Ip string
    Agent string
    Tag []string
  }

  func GetIP(r *http.Request) string {
      if ipProxy := r.Header.Get("X-FORWARDED-FOR"); len(ipProxy) > 0 {
          return ipProxy
      }
      ip, _, _ := net.SplitHostPort(r.RemoteAddr)
      return ip
  }

  func randStr(strSize int, randType string) string {
     var dictionary string
     if randType == "alphanum" {
        dictionary = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
     }
     if randType == "alpha" {
        dictionary = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
     }
     if randType == "number" {
        dictionary = "0123456789"
     }
     var bytes = make([]byte, strSize)
     rand.Read(bytes)
     for k, v := range bytes {
        bytes[k] = dictionary[v%byte(len(dictionary))]
     }
     return string(bytes)
   }

  func main() {

      // MARTINI
      m := martini.Classic()
      m.Use(render.Renderer(render.Options{
            Layout: "layout",
      }))

      // MONGODB
      session, err := mgo.Dial(mongoConfig)
      if err != nil {
        panic(err)
      }
      defer session.Close()
      session.SetMode(mgo.Monotonic, true)
      webkoe_blog := session.DB("admin").C(blogCollection)

      // ROUTER
      m.Get("/", func(r render.Render, req *http.Request) {
        if req.Host == hostHome {
          r.HTML(200, "home", req.Host)
        }else if req.Host == hostCatatan {
          r.HTML(200, "home-catatan", req.Host)
        }
      })

      m.Get("/blog", func(r render.Render) {
        var results []Blog
        err = webkoe_blog.Find(bson.M{}).Sort("-date").Limit(100).All(&results)
        if err != nil {
          panic(err)
        }
        // fmt.Println(results)
        r.HTML(200, "blog", results)
      })
      m.Post("/blog", func(req *http.Request, r render.Render){
        
        things := req.FormValue("things") + " "
        
        // tag
        regex, err := regexp.Compile("#([a-z])+ ")
        remove, err := regexp.Compile("(#| )")
        tags := regex.FindAllString(things, -1)
        // fmt.Println(tags)

        // modify semua listA
        var modTags []string
        for _, value := range tags {
            final := remove.ReplaceAllString(value, "")
            modTags = append(modTags, final)
        }
        // fmt.Println(modTags)


        waktu := strings.Split(fmt.Sprint(time.Now()), ".")[0]
        blog_id := randStr(7, "alphanum")
        ip := GetIP(req)
        agent := fmt.Sprint(req.Header["User-Agent"])

        jsonBlog := &Blog{Id: blog_id, Things: things, Date: waktu, Ip: ip, Agent: agent, Tag: modTags}
        err = webkoe_blog.Insert(jsonBlog)
        if err != nil {
          panic(err)
        }
        // fmt.Println(agent)
        r.Redirect("/blog")
      })
      m.Get("/blog/write", func(r render.Render) {
        r.HTML(200, "blog-form", nil)
      })

      m.RunOnAddr(":8080")
  }