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session.go
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session.go
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package oidc
import (
"crypto/rand"
"fmt"
"io"
"net/http"
"time"
"github.com/coreos/go-oidc/v3/oidc"
"github.com/golang-jwt/jwt/v5"
"github.com/labstack/echo/v4"
"github.com/rs/xid"
"github.com/spf13/viper"
)
func init() {
viper.SetDefault("oidc.session.lifetime", "2h")
}
const (
cookieName = "__PLAINCOOKING_TOKEN"
contextKey = "__PLAINCOOKING_CLAIMS"
)
type AuthorizationError struct {
message string
cause error
}
func (e AuthorizationError) Error() string {
return fmt.Sprintf("%s: %v", e.message, e.cause)
}
type Claims struct {
jwt.RegisteredClaims
Email string `json:"email"`
PreferredUsername string `json:"preferred_username"`
Name string `json:"name"`
Picture string `json:"picture"`
}
type Session struct {
secret []byte
}
func NewSession() (*Session, error) {
secret, err := randomBytes(64)
if err != nil {
return nil, err
}
return &Session{
secret: secret,
}, nil
}
func (s *Session) Require(next echo.HandlerFunc) echo.HandlerFunc {
return func(ctx echo.Context) error {
claims, err := s.Claims(ctx)
if err != nil {
return err
}
ctx.Set(contextKey, claims)
return next(ctx)
}
}
func (s *Session) Claims(ctx echo.Context) (*Claims, error) {
if claims, ok := ctx.Get(contextKey).(*Claims); ok {
return claims, nil
}
cookie, err := ctx.Cookie(cookieName)
if err != nil {
return nil, AuthorizationError{"could not read session cookie", err}
}
claims, err := s.decodeClaims(cookie.Value)
if err != nil {
s.setCookie(ctx, "", -1)
return nil, AuthorizationError{"could not decode session claims", err}
}
return claims, nil
}
func (s *Session) saveClaims(ctx echo.Context, userInfo *oidc.UserInfo) error {
claims, err := s.claimsFromUserInfo(userInfo)
if err != nil {
return err
}
token, err := s.encodeAndSignClaims(claims)
if err != nil {
return err
}
s.setCookie(ctx, token, 0)
return nil
}
func (s *Session) setCookie(ctx echo.Context, token string, maxAge int) {
cookie := http.Cookie{
Name: cookieName,
Value: token,
Path: "/",
MaxAge: maxAge,
HttpOnly: true,
}
ctx.SetCookie(&cookie)
}
func (s *Session) claimsFromUserInfo(userInfo *oidc.UserInfo) (*Claims, error) {
var claims Claims
if err := userInfo.Claims(&claims); err != nil {
return nil, err
}
lifetime := viper.GetDuration("oidc.session.lifetime")
issuedAt := time.Now()
expiresAt := issuedAt.Add(lifetime)
claims.RegisteredClaims = jwt.RegisteredClaims{
ID: xid.New().String(),
Subject: userInfo.Subject,
IssuedAt: jwt.NewNumericDate(issuedAt),
ExpiresAt: jwt.NewNumericDate(expiresAt),
}
return &claims, nil
}
func (s *Session) encodeAndSignClaims(claims *Claims) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS384, claims)
return token.SignedString(s.secret)
}
func (s *Session) decodeClaims(token string) (*Claims, error) {
var claims Claims
_, err := jwt.ParseWithClaims(token, &claims, s.key)
return &claims, err
}
func (s *Session) key(token *jwt.Token) (any, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Method.Alg())
}
return s.secret, nil
}
func randomBytes(n int) ([]byte, error) {
b := make([]byte, n)
_, err := io.ReadFull(rand.Reader, b)
return b, err
}