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session.go
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session.go
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package session
import (
"time"
"github.com/dgrijalva/jwt-go/v4"
"github.com/tiptophelmet/nomess-core/errs"
"github.com/tiptophelmet/nomess-core/logger"
)
type sessionManager struct {
jwtExpTime int64
jwtExpWindow int64
jwtSecret string
}
var session *sessionManager
func Init(jwtExpTime, jwtExpWindow int64, jwtSecret string) {
session = &sessionManager{jwtExpTime, jwtExpWindow, jwtSecret}
}
func Get() *sessionManager {
if session == nil {
logger.Fatal("session manager was not initialized")
}
return session
}
func (session *sessionManager) IssueSessionToken(userID string) (string, error) {
// TODO: Add jti support
claims := jwt.MapClaims{
"sub": userID,
"exp": time.Now().Unix() + session.jwtExpTime,
"iat": time.Now().Unix(),
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
signedJwt, err := token.SignedString([]byte(session.jwtSecret))
if err != nil {
logger.Fatal("failed to sign jwt: %v", err.Error())
return "", errs.ErrJwtNotIssued
}
return signedJwt, nil
}
func (session *sessionManager) checkRotationCondition(jwtClaimedExpTime int64) (bool, error) {
currentTime := time.Now().Unix()
isExpired := currentTime > jwtClaimedExpTime
isRotationWindowOk := currentTime < jwtClaimedExpTime+session.jwtExpWindow
return isExpired && isRotationWindowOk, nil
}
func (session *sessionManager) TryRotateSessionToken(signedToken string) (string, error) {
parsedToken, err := jwt.Parse(signedToken, func(token *jwt.Token) (interface{}, error) {
return []byte(session.jwtSecret), nil
})
if !parsedToken.Valid {
return "", errs.ErrInvalidJwt
}
_, isTokenExpError := err.(*jwt.TokenExpiredError)
if err != nil && !isTokenExpError {
return "", errs.ErrJwtNotParsed
}
claims, ok := parsedToken.Claims.(jwt.MapClaims)
if !ok {
return "", errs.ErrInvalidJwtClaims
}
jwtClaimedExpTime := claims["exp"].(int64)
isRotationOk, err := session.checkRotationCondition(jwtClaimedExpTime)
if err != nil {
return "", err
}
if isRotationOk {
return session.IssueSessionToken(claims["sub"].(string))
}
return "", nil
}
func (session *sessionManager) ValidateSessionToken(token string) (bool, error) {
parsedToken, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
return []byte(session.jwtSecret), nil
})
if !parsedToken.Valid || err != nil {
return false, nil
}
return true, nil
}