/
session_service.go
53 lines (44 loc) · 1.39 KB
/
session_service.go
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package model
import (
"crypto/rand"
"encoding/base64"
"io"
"time"
)
// SessionService manages sessions.
type SessionService interface {
NewSession() (Session, error)
SessionDurationSeconds() int
ProlongSession(sessionID string) error
}
// SessionManager is a default session service.
type SessionManager struct {
sessionDuration SessionDuration
sessionStorage SessionStorage
}
// NewSessionManager creates new session manager and returns it.
func NewSessionManager(sessionDuration SessionDuration, sessionStorage SessionStorage) SessionService {
return &SessionManager{
sessionDuration: sessionDuration,
sessionStorage: sessionStorage,
}
}
// NewSession creates new session and returns it.
func (sm *SessionManager) NewSession() (Session, error) {
session := Session{ExpirationTime: time.Now().Add(sm.sessionDuration.Duration).Unix()}
id := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, id); err != nil {
return session, err
}
session.ID = base64.URLEncoding.EncodeToString(id)
return session, nil
}
// SessionDurationSeconds returns session duration in seconds.
func (sm *SessionManager) SessionDurationSeconds() int {
return int(sm.sessionDuration.Duration / time.Second)
}
// ProlongSession prolongs session duration.
func (sm *SessionManager) ProlongSession(sessionID string) error {
err := sm.sessionStorage.ProlongSession(sessionID, sm.sessionDuration)
return err
}