Go : How to Set same Cookie on all pages?

Question

After logging in my url changes to /login/ and cookie gets set. After setting cookie need to redirect the page on home page (url : /homePage/) other than /login/.

How to set same cookie in all pages?

Answer 1

You can use the inbuilt CookieJar library to manage a store of cookies (see this answer for some pointers), but it's probably easier to use something like Gorilla Sessions from the Gorilla Web Toolkit.

There is also some GAE specific setup (from http://www.gorillatoolkit.org/):

For Google App Engine, create a directory tree inside your app and clone the repository there:

$ cd myapp
$ mkdir -p github.com/gorilla
$ cd github.com/gorilla
$ git clone git://github.com/gorilla/mux.git

The last line of that example is specific to the mux package. You would replace it with:

git clone git://github.com/gorilla/sessions.git

A quick example:

Define your cookie store:

import (
    "github.com/gorilla/sessions"
    "net/http"
)

// Authorization Key
var authKey = []byte{
    0x70, 0x23, 0xbd, 0xcb, 0x3a, 0xfd, 0x73, 0x48,
    0x46, 0x1c, 0x06, 0xcd, 0x81, 0xfd, 0x38, 0xeb,
    0xfd, 0xa8, 0xfb, 0xba, 0x90, 0x4f, 0x8e, 0x3e,
    0xa9, 0xb5, 0x43, 0xf6, 0x54, 0x5d, 0xa1, 0xf2,
}

// Encryption Key
var encKey = []byte{
    0x31, 0x98, 0x3E, 0x1B, 0x00, 0x67, 0x62, 0x86,
    0xB1, 0x7B, 0x60, 0x01, 0xAA, 0xA8, 0x76, 0x44,
    0x00, 0xEB, 0x56, 0x04, 0x26, 0x9B, 0x5A, 0x57,
    0x29, 0x72, 0xA1, 0x62, 0x5B, 0x8C, 0xE9, 0xA1,
}

var store = sessions.NewCookieStore(authKey, encKey)

func initSession(r *http.Request) *sessions.Session {
    session, _ := store.Get(r, "my_cookie")
    if session.IsNew {
        session.Options.Domain = "example.org"
        session.Options.MaxAge = 0
        session.Options.HttpOnly = false
        session.Options.Secure = true
    }
    return session
}

And then, in your page handlers you just load the cookie, set any options you like and re-save it:

func ViewPageHandler(w http.ResponseWriter, r *http.Request) {
    session := initSession(r)
    session.Values["page"] = "view"
    session.Save(r, w)
....

Hope that helps.