141 lines
3.8 KiB
Go
141 lines
3.8 KiB
Go
package auth
|
|
|
|
import (
|
|
"net/http"
|
|
"time"
|
|
|
|
jwt "github.com/dgrijalva/jwt-go"
|
|
"github.com/pkg/errors"
|
|
|
|
"github.com/umputun/remark/app/store"
|
|
)
|
|
|
|
// JWT wraps jwt operations
|
|
// supports both header and cookie jwt
|
|
type JWT struct {
|
|
secret string
|
|
secureCookies bool
|
|
exp time.Duration
|
|
}
|
|
|
|
// CustomClaims stores user info for auth and state & from from login
|
|
type CustomClaims struct {
|
|
jwt.StandardClaims
|
|
User *store.User `json:"user,omitempty"`
|
|
|
|
// state and from used for oauth handshake
|
|
State string `json:"state,omitempty"`
|
|
From string `json:"from,omitempty"`
|
|
}
|
|
|
|
const jwtCookieName = "JWT"
|
|
const jwtHeaderKey = "X-JWT"
|
|
const xsrfCookieName = "XSRF-TOKEN"
|
|
const xsrfHeaderKey = "X-XSRF-TOKEN"
|
|
|
|
// NewJWT makes JWT service
|
|
func NewJWT(secret string, secureCookies bool, exp time.Duration) *JWT {
|
|
res := JWT{
|
|
secret: secret,
|
|
secureCookies: secureCookies,
|
|
exp: exp,
|
|
}
|
|
return &res
|
|
}
|
|
|
|
// Set creates jwt cookie with xsrf cookie and put it to ResponseWriter
|
|
// accepts claims and sets expiration if none defined
|
|
func (j *JWT) Set(w http.ResponseWriter, claims *CustomClaims) error {
|
|
if claims.ExpiresAt == 0 {
|
|
claims.ExpiresAt = time.Now().Add(j.exp).Unix()
|
|
}
|
|
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
|
|
tokenString, err := token.SignedString([]byte(j.secret))
|
|
if err != nil {
|
|
return errors.Wrap(err, "can't sign jwt token")
|
|
}
|
|
|
|
cookieExpiration := 365 * 24 * 3600 // 1 year
|
|
|
|
jwtCookie := http.Cookie{Name: jwtCookieName, Value: tokenString, HttpOnly: true, Path: "/",
|
|
MaxAge: cookieExpiration, Secure: j.secureCookies}
|
|
http.SetCookie(w, &jwtCookie)
|
|
|
|
xsrfCookie := http.Cookie{Name: xsrfCookieName, Value: claims.Id, HttpOnly: false, Path: "/",
|
|
MaxAge: cookieExpiration, Secure: j.secureCookies}
|
|
http.SetCookie(w, &xsrfCookie)
|
|
|
|
return nil
|
|
}
|
|
|
|
// Get jwt from header or cookie
|
|
// if cookie used, verify xsrf token to match
|
|
func (j *JWT) Get(r *http.Request) (*CustomClaims, error) {
|
|
|
|
fromCookie := false
|
|
tokenString := ""
|
|
|
|
if tokenHeader := r.Header.Get(jwtHeaderKey); tokenHeader != "" {
|
|
tokenString = tokenHeader
|
|
}
|
|
|
|
if tokenString == "" {
|
|
fromCookie = true
|
|
jc, err := r.Cookie(jwtCookieName)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "jwt cookie was not presented")
|
|
}
|
|
tokenString = jc.Value
|
|
}
|
|
|
|
token, err := jwt.ParseWithClaims(tokenString, &CustomClaims{}, func(token *jwt.Token) (interface{}, error) {
|
|
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
|
|
return nil, errors.Errorf("unexpected signing method: %v", token.Header["alg"])
|
|
}
|
|
return []byte(j.secret), nil
|
|
})
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "can't parse jwt")
|
|
}
|
|
|
|
claims, ok := token.Claims.(*CustomClaims)
|
|
if !ok || !token.Valid {
|
|
return nil, errors.New("invalid jwt")
|
|
}
|
|
|
|
if fromCookie && claims.User != nil {
|
|
xsrf := r.Header.Get(xsrfHeaderKey)
|
|
if claims.Id != xsrf {
|
|
return nil, errors.New("xsrf mismatch")
|
|
}
|
|
}
|
|
|
|
return claims, nil
|
|
}
|
|
|
|
// Refresh gets jwt from request, checks if it will be expiring soon (1/2 of expiration) and create the new onw
|
|
func (j *JWT) Refresh(w http.ResponseWriter, r *http.Request) (*CustomClaims, error) {
|
|
claims, err := j.Get(r)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
untilExp := claims.ExpiresAt - time.Now().Unix()
|
|
if untilExp <= int64(j.exp.Seconds()/2) {
|
|
claims.ExpiresAt = time.Now().Add(j.exp).Unix()
|
|
e := j.Set(w, claims)
|
|
return claims, e
|
|
}
|
|
return claims, nil
|
|
}
|
|
|
|
// Reset token's cookies
|
|
func (j *JWT) Reset(w http.ResponseWriter) {
|
|
jwtCookie := http.Cookie{Name: jwtCookieName, Value: "", HttpOnly: false, Path: "/",
|
|
MaxAge: -1, Expires: time.Unix(0, 0), Secure: j.secureCookies}
|
|
http.SetCookie(w, &jwtCookie)
|
|
|
|
xsrfCookie := http.Cookie{Name: xsrfCookieName, Value: "", HttpOnly: false, Path: "/",
|
|
MaxAge: -1, Expires: time.Unix(0, 0), Secure: j.secureCookies}
|
|
http.SetCookie(w, &xsrfCookie)
|
|
}
|