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session.go
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session.go
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package main
import (
"context"
"fmt"
"log"
"net/http"
"time"
// JWT is not in the native Go packages
"github.com/dgrijalva/jwt-go"
)
type Key int
const MyKey Key = 0
// JWT schema of the data it will store
type Claims struct {
Username string `json:"username"`
jwt.StandardClaims
}
// create a JWT and put in the clients cookie
func setToken(res http.ResponseWriter, req *http.Request) {
// 30m Expiration for non-sensitive applications - OWSAP
expireToken := time.Now().Add(time.Minute * 30).Unix()
expireCookie := time.Now().Add(time.Minute * 30)
// token Claims
claims := Claims{
"TestUser",
jwt.StandardClaims{
ExpiresAt: expireToken,
Issuer: "localhost:9000",
},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
signedToken, _ := token.SignedString([]byte("secret"))
// Set Cookie parameters
cookie := http.Cookie{
Name: "Auth",
Value: signedToken,
Expires: expireCookie, // 30 min
HttpOnly: true,
Path: "/",
Domain: "127.0.0.1",
Secure: true,
}
http.SetCookie(res, &cookie)
http.Redirect(res, req, "/profile", http.StatusTemporaryRedirect)
}
// middleware to protect private pages
func validate(page http.HandlerFunc) http.HandlerFunc {
return func(res http.ResponseWriter, req *http.Request) {
cookie, err := req.Cookie("Auth")
if err != nil {
res.Header().Set("Content-Type", "text/html")
fmt.Fprint(res, "Unauthorized - Please login <br>")
fmt.Fprintf(res, "<a href=\"login\"> Login </a>")
return
}
token, err := jwt.ParseWithClaims(cookie.Value, &Claims{},
func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method")
}
return []byte("secret"), nil
},
)
if err != nil {
res.Header().Set("Content-Type", "text/html")
fmt.Fprint(res, "Unauthorized - Please login <br>")
fmt.Fprintf(res, "<a href=\"login\"> Login </a>")
return
}
if claims, ok := token.Claims.(*Claims); ok && token.Valid {
ctx := context.WithValue(req.Context(), MyKey, *claims)
page(res, req.WithContext(ctx))
} else {
res.Header().Set("Content-Type", "text/html")
fmt.Fprint(res, "Unauthorized - Please login <br>")
fmt.Fprintf(res, "<a href=\"login\"> Login </a>")
return
}
}
}
// only viewable if the client has a valid token
func protectedProfile(res http.ResponseWriter, req *http.Request) {
claims, ok := req.Context().Value(MyKey).(Claims)
if !ok {
res.Header().Set("Content-Type", "text/html")
fmt.Fprint(res, "Unauthorized - Please login <br>")
fmt.Fprintf(res, "<a href=\"login\"> Login </a>")
return
}
res.Header().Set("Content-Type", "text/html")
fmt.Fprintf(res, "Hello %s <br>", claims.Username)
fmt.Fprintf(res, "<a href=\"logout\"> Logout </a>")
}
// deletes the cookie
func logout(res http.ResponseWriter, req *http.Request) {
deleteCookie := http.Cookie{
Name: "Auth",
Value: "none",
Expires: time.Now(),
}
http.SetCookie(res, &deleteCookie)
}
func main() {
http.HandleFunc("/", validate(protectedProfile))
http.HandleFunc("/login", setToken)
http.HandleFunc("/profile", validate(protectedProfile))
http.HandleFunc("/logout", validate(logout))
err := http.ListenAndServeTLS(":443", "cert/cert.pem", "cert/key.pem", nil)
if err != nil {
log.Fatal("ListenAndServe: ", err)
}
}