I have been in DevOps related jobs for past 6 years dealing mainly with Kubernetes in AWS and on-premise as well. I spent quite a lot …
Go sessions
package main
import (
"fmt"
"html/template"
"io"
"log"
"net/http"
uuid "github.com/satori/go.uuid"
)
type user struct {
UserName string
First string
Last string
}
type session map[string]string
var tpl *template.Template
var dbUsers = map[string]user{}
var dbSessions = map[string]session{}
func init() {
tpl = template.Must(template.ParseFiles("index.gohtml"))
}
func main() {
http.HandleFunc("/", index)
// http.HandleFunc("/bar", bar)
http.Handle("/favicon.ico", http.NotFoundHandler())
log.Fatalln(http.ListenAndServe(":8080", nil))
}
func index(w http.ResponseWriter, r *http.Request) {
c, err := r.Cookie("session")
if err != nil {
sID, _ := uuid.NewV4()
c := &http.Cookie{
Name: "session",
Value: sID.String(),
}
http.SetCookie(w, c)
}
var u user
if r.Method == http.MethodPost {
un := r.FormValue("username")
f := r.FormValue("firstname")
l := r.FormValue("lastname")
// {
// "123": {
// "jano": {},
// "vilko": {},
// "sasa": {}
// },
// }
if _, ok := dbSessions[c.Value]; !ok {
dbSessions[c.Value] = session{}
}
if _, ok := dbSessions[c.Value][un]; ok {
io.WriteString(w, `<p>User: ` + un + ` already registered</p>`)
u = dbUsers[un]
} else {
u = user{
UserName: un,
First: f,
Last: l,
}
tmp := dbSessions[c.Value]
tmp[un] = ""
dbSessions[c.Value] = tmp
dbUsers[un] = u
}
}
tpl.ExecuteTemplate(w, "index.gohtml", u)
fmt.Printf("db sessions: %v\n", dbSessions)
fmt.Printf("db users: %v\n", dbUsers)
}
// cat index.gohtml
// <!doctype html>
// <html lang="en">
// <head>
// <meta charset="UTF-8">
// <title>Document</title>
// </head>
// <body>
// <form method="post">
// <input type="email" name="username" placeholder="email"><br>
// <input type="text" name="firstname" placeholder="first name"><br>
// <input type="text" name="lastname" placeholder="last name"><br>
// <input type="submit">
// </form>
// {{if .First}}
// USER NAME {{.UserName}}<br>
// FIRST {{.First}}<br>
// LAST {{.Last}}<br>
// {{end}}
// <br>
// <h2>Go to <a href="/bar">the bar</a></h2>
// </body>
// </html>