基于Golang会话的身份验证

Question

I am trying to authenticate a user (using email and password) in golang but I am having some problems with sessions. It seems like I cant retrieve the session value from /login/ to / (home) page.

User Registration

hashedPassword, _ := bcrypt.GenerateFromPassword([]byte(r.Form["passwordSignup"][0]), bcrypt.DefaultCost)

err = c.Insert(&model.UserModel{
  Email:     r.Form["emailSignup"][0],
  Password:  string(hashedPassword),
  CreatedAt: time.Now(),
})

// TODO : should session management be made in here ???
// you can use gorilla sessions if you want as far it works

http.SetCookie(w, cookie)
http.Redirect(w, r, "/", 301) // goes to the homepage(only accessed by authenticated users)

Login

if r.Form["emailLogin"][0] == result.Email 
&& bcrypt.CompareHashAndPassword([]byte(result.Password), []byte(r.Form["passwordLogin"][0])) == nil {

  // TODO : Handling the session in here

  http.Redirect(w, r, "/", 301) // goes to the home page
} else {
  http.Redirect(w, r, "/login/", 301)
}

I checked this links too : http://shadynasty.biz/blog/2012/09/05/auth-and-sessions/ https://www.youtube.com/watch?v=p0tGnjW_xxI

Answer 1

Importantly, you should check all of your errors - e.g.:

- hashedPassword, _ := bcrypt.GenerateFromPassword([]byte(r.Form["passwordSignup"][0]), bcrypt.DefaultCost)
# Check our error, especially for something as important as password hashing
+ hashedPassword, err := bcrypt.GenerateFromPassword([]byte(r.Form["passwordSignup"][0]), bcrypt.DefaultCost)
if err != nil {
    http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
    return
}

---

A lot of your relevant cookie code is missing, but here's what it should look like:

cookie := &http.Cookie{
        Name: "my_app",
        Value: val, // Some encoded value
        Path: "/", // Otherwise it defaults to the /login if you create this on /login (standard cookie behaviour)
        MaxAge: 86400, // One day
}

http.SetCookie(w, cookie)

Alternatively, if you use gorilla/sessions (which I recommend because it correctly authenticates cookies), you would do the following:

session, err := store.Get(r, "session-name")
if err != nil {
    http.Error(w, err.Error(), 500)
    return
}

session.Options.Path = "/"
session.Values["user"] = user

err := session.Save(r, w)
if err != nil {
    http.Error(w, err.Error(), 500)
    return
}

http.Redirect(w, r, "/", 301)