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jwt.go
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jwt.go
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package ujwt
import (
"errors"
"fmt"
"time"
"github.com/golang-jwt/jwt/v4"
)
type Jwt[Account any, Session any] struct {
opts Options
}
func New[Account any, Session any](opts Options) *Jwt[Account, Session] {
return &Jwt[Account, Session]{
opts: opts,
}
}
func (o *Jwt[Account, Session]) NewAccess(account Account, session Session) (string, error) {
return o.new(AccessClaims[Account, Session]{
RegisteredClaims: registeredClaims(o.opts.ExpirationTime),
Account: account,
Session: session,
})
}
func (o *Jwt[Account, Session]) NewRefresh(session Session) (string, error) {
return o.new(RefreshClaims[Session]{
RegisteredClaims: registeredClaims(o.opts.RefreshExpirationTime),
Session: session,
})
}
func (o *Jwt[Account, Session]) New(account Account, session Session) (token string, refreshToken string, err error) {
token, err = o.NewAccess(account, session)
if err == nil {
refreshToken, err = o.NewRefresh(session)
}
return
}
func (o *Jwt[Account, Session]) ParseAccess(token string) (claims AccessClaims[Account, Session], err error) {
err = o.parse(token, &claims)
return
}
func (o *Jwt[Account, Session]) ParseRefresh(token string) (claims RefreshClaims[Session], err error) {
err = o.parse(token, &claims)
return
}
func (o *Jwt[Account, Session]) ParseRefreshSession(token string) (Session, error) {
claims, err := o.ParseRefresh(token)
return claims.Session, err
}
func (o *Jwt[Account, Session]) Options() Options {
return o.opts
}
func (o *Jwt[Account, Session]) new(claims jwt.Claims) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString(o.opts.KeyBytes())
}
func (o *Jwt[Account, Session]) parse(token string, claims jwt.Claims) (err error) {
err = emptyRestrict(token)
if err == nil {
_, err = jwt.ParseWithClaims(token, claims, func(t *jwt.Token) (any, error) {
if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("jwt unexpected signing method: %v", t.Header["alg"])
}
return o.opts.KeyBytes(), nil
})
}
return
}
func registeredClaims(expirationTime time.Duration) jwt.RegisteredClaims {
return jwt.RegisteredClaims{
ExpiresAt: jwt.NewNumericDate(time.Now().Add(expirationTime)),
}
}
func emptyRestrict(token string) error {
if token == "" || token == "null" {
return errors.New("jwt token is empty")
}
return nil
}