76 lines
1.5 KiB
Go
Executable File
76 lines
1.5 KiB
Go
Executable File
package auth
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import (
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"sync"
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"time"
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)
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const tokenBytes = 32
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type SessionStore struct {
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mutex sync.Mutex
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ttl time.Duration
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expirations map[string]time.Time
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}
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func NewSessionStore(ttl time.Duration) *SessionStore {
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return &SessionStore{ttl: ttl, expirations: make(map[string]time.Time)}
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}
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func (store *SessionStore) Create() (string, error) {
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buffer := make([]byte, tokenBytes)
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if _, err := rand.Read(buffer); err != nil {
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return "", err
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}
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token := base64.RawURLEncoding.EncodeToString(buffer)
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store.mutex.Lock()
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defer store.mutex.Unlock()
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now := time.Now()
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store.removeExpired(now)
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store.expirations[hashToken(token)] = now.Add(store.ttl)
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return token, nil
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}
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func (store *SessionStore) Valid(token string) bool {
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if token == "" {
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return false
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}
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key := hashToken(token)
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store.mutex.Lock()
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defer store.mutex.Unlock()
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expiresAt, found := store.expirations[key]
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if !found {
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return false
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}
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if time.Now().After(expiresAt) {
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delete(store.expirations, key)
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return false
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}
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return true
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}
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func (store *SessionStore) Delete(token string) {
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store.mutex.Lock()
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defer store.mutex.Unlock()
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delete(store.expirations, hashToken(token))
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}
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func (store *SessionStore) removeExpired(now time.Time) {
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for key, expiresAt := range store.expirations {
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if now.After(expiresAt) {
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delete(store.expirations, key)
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}
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}
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}
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func hashToken(token string) string {
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sum := sha256.Sum256([]byte(token))
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return hex.EncodeToString(sum[:])
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}
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