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store.go
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store.go
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package session
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"encoding/gob"
"errors"
"io"
"net/http"
)
type Store interface {
Get(r *http.Request) (*Session, error)
Save(w http.ResponseWriter) error
}
const defaultName string = "journal-session"
type DefaultStore struct {
cachedSession *Session
key []byte
name string
}
func NewDefaultStore(key string) *DefaultStore {
return &DefaultStore{
key: []byte(key),
name: defaultName,
}
}
func (s *DefaultStore) Get(r *http.Request) (*Session, error) {
var err error
if s.cachedSession == nil {
session := NewSession()
c, err := r.Cookie(s.name)
if err == nil {
err = s.decrypt(c.Value, &session.Values)
} else {
err = nil
}
if err == nil {
s.cachedSession = session
}
}
return s.cachedSession, err
}
func (s *DefaultStore) Save(w http.ResponseWriter) error {
encrypted, err := s.encrypt(s.cachedSession.Values)
if err != nil {
return err
}
http.SetCookie(w, &http.Cookie{
Name: s.name,
Value: encrypted,
Path: "/",
Domain: "",
MaxAge: 86400 * 30,
Secure: false,
SameSite: http.SameSiteStrictMode,
HttpOnly: false,
})
return nil
}
func (s *DefaultStore) decrypt(encrypted string, output interface{}) error {
c, err := aes.NewCipher(s.key)
if err != nil {
return err
}
gcm, err := cipher.NewGCM(c)
if err != nil {
return err
}
nonceSize := gcm.NonceSize()
asBytes, _ := base64.URLEncoding.DecodeString(encrypted)
if err != nil || len(asBytes) < nonceSize {
return errors.New("string length too short")
}
nonce, asBytes := asBytes[:nonceSize], asBytes[nonceSize:]
decrypted, err := gcm.Open(nil, nonce, asBytes, nil)
if err != nil {
return err
}
gob.Register(map[string]interface{}{})
gob.Register([]interface{}{})
dec := gob.NewDecoder(bytes.NewBuffer(decrypted))
return dec.Decode(output)
}
func (s *DefaultStore) encrypt(input interface{}) (string, error) {
var buf bytes.Buffer
gob.Register(map[string]interface{}{})
gob.Register([]interface{}{})
enc := gob.NewEncoder(&buf)
if err := enc.Encode(input); err != nil {
return "", err
}
c, err := aes.NewCipher(s.key)
if err != nil {
return "", err
}
gcm, err := cipher.NewGCM(c)
if err != nil {
return "", err
}
nonce := make([]byte, gcm.NonceSize())
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
return "", err
}
return base64.URLEncoding.EncodeToString(gcm.Seal(nonce, nonce, buf.Bytes(), nil)), nil
}