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| package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"text/template"
"github.com/golang-jwt/jwt"
)
type Account struct {
id string
pw string
is_admin bool
secret_key string
}
type AccountClaims struct {
Id string `json:"id"`
Is_admin bool `json:"is_admin"`
jwt.StandardClaims
}
type Resp struct {
Status bool `json:"status"`
Msg string `json:"msg"`
}
type TokenResp struct {
Status bool `json:"status"`
Token string `json:"token"`
}
var acc []Account
var secret_key = os.Getenv("KEY")
var flag = os.Getenv("FLAG")
var admin_id = os.Getenv("ADMIN_ID")
var admin_pw = os.Getenv("ADMIN_PW")
func clear_account() {
acc = acc[:1]
}
func get_account(uid string) Account {
for i := range acc {
if acc[i].id == uid {
return acc[i]
}
}
return Account{}
}
func jwt_encode(id string, is_admin bool) (string, error) {
claims := AccountClaims{
id, is_admin, jwt.StandardClaims{},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString([]byte(secret_key))
}
func jwt_decode(s string) (string, bool) {
token, err := jwt.ParseWithClaims(s, &AccountClaims{}, func(token *jwt.Token) (interface{}, error) {
return []byte(secret_key), nil
})
if err != nil {
fmt.Println(err)
return "", false
}
if claims, ok := token.Claims.(*AccountClaims); ok && token.Valid {
return claims.Id, claims.Is_admin
}
return "", false
}
func auth_handler(w http.ResponseWriter, r *http.Request) {
uid := r.FormValue("id")
upw := r.FormValue("pw")
if uid == "" || upw == "" {
return
}
if len(acc) > 1024 {
clear_account()
}
user_acc := get_account(uid)
if user_acc.id != "" && user_acc.pw == upw {
token, err := jwt_encode(user_acc.id, user_acc.is_admin)
if err != nil {
return
}
p := TokenResp{true, token}
res, err := json.Marshal(p)
if err != nil {
}
w.Write(res)
return
}
w.WriteHeader(http.StatusForbidden)
return
}
func regist_handler(w http.ResponseWriter, r *http.Request) {
uid := r.FormValue("id")
upw := r.FormValue("pw")
if uid == "" || upw == "" {
return
}
if get_account(uid).id != "" {
w.WriteHeader(http.StatusForbidden)
return
}
if len(acc) > 4 {
clear_account()
}
new_acc := Account{uid, upw, false, secret_key}
acc = append(acc, new_acc)
p := Resp{true, ""}
res, err := json.Marshal(p)
if err != nil {
}
w.Write(res)
return
}
func flag_handler(w http.ResponseWriter, r *http.Request) {
token := r.Header.Get("X-Token")
if token != "" {
id, is_admin := jwt_decode(token)
if is_admin == true {
p := Resp{true, "Hi " + id + ", flag is " + flag}
res, err := json.Marshal(p)
if err != nil {
}
w.Write(res)
return
} else {
w.WriteHeader(http.StatusForbidden)
return
}
}
}
func root_handler(w http.ResponseWriter, r *http.Request) {
token := r.Header.Get("X-Token")
if token != "" {
id, _ := jwt_decode(token)
acc := get_account(id)
tpl, err := template.New("").Parse("Logged in as " + acc.id)
if err != nil {
}
tpl.Execute(w, &acc)
} else {
return
}
}
func main() {
admin := Account{admin_id, admin_pw, true, secret_key}
acc = append(acc, admin)
http.HandleFunc("/", root_handler)
http.HandleFunc("/auth", auth_handler)
http.HandleFunc("/flag", flag_handler)
http.HandleFunc("/regist", regist_handler)
log.Fatal(http.ListenAndServe("0.0.0.0:11000", nil))
}
|
