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session.go
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session.go
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package session
import (
"crypto/rand"
"encoding/base64"
"fmt"
"io"
"net/http"
"net/url"
"sync"
"time"
)
const (
Username = "username"
WorkingDir = "wd"
)
var SessionManager *Manager
type Session interface {
Set(key, value interface{}) error
Get(key interface{}) interface{}
Delete(key interface{}) error
SessionID() string
}
type Provider interface {
SessionInit(sid string) (Session, error)
SessionRead(sid string) (Session, error)
SessionDestroy(sid string) error
SessionGC(maxLifetime int)
}
var providers = make(map[string]Provider)
func Register(name string, provider Provider) {
if provider == nil {
panic("session: Register provider is nil")
}
if _, dup := providers[name]; dup {
panic("session: Requier called twice for provider " + name)
}
providers[name] = provider
}
type Manager struct {
cookieName string
lock sync.Mutex
provider Provider
maxLifetime int
}
func NewManager(providerName string, cookieName string, maxLifetime int) (*Manager, error) {
provider, ok := providers[providerName]
if !ok {
return nil, fmt.Errorf("session: unknown provider %q", providerName)
}
return &Manager{
cookieName: cookieName,
provider: provider,
maxLifetime: maxLifetime,
}, nil
}
func (manager *Manager) SessionStart(w http.ResponseWriter, r *http.Request) (session Session) {
manager.lock.Lock()
defer manager.lock.Unlock()
cookie, err := r.Cookie(manager.cookieName)
if err != nil || cookie.Value == "" {
sid := manager.sessionId()
sess, _ := manager.provider.SessionInit(sid)
cookie := http.Cookie{Name: manager.cookieName, Value: url.QueryEscape(sid), Path: "/", HttpOnly: true, MaxAge: manager.maxLifetime}
http.SetCookie(w, &cookie)
return sess
} else {
sid, _ := url.QueryUnescape(cookie.Value)
sess, _ := manager.provider.SessionRead(sid)
return sess
}
}
func (manager *Manager) SessionEnd(w http.ResponseWriter, r *http.Request) error {
manager.lock.Lock()
defer manager.lock.Unlock()
cookie, err := r.Cookie(manager.cookieName)
if err != nil {
return err
}
sessionId, _ := url.QueryUnescape(cookie.Value)
err = manager.provider.SessionDestroy(sessionId)
if err != nil {
return err
}
return nil
}
func (manager *Manager) GC() {
manager.lock.Lock()
defer manager.lock.Unlock()
manager.provider.SessionGC(manager.maxLifetime)
time.AfterFunc(time.Duration(manager.maxLifetime), func() { manager.GC() })
}
func (manager *Manager) SessionExists(w http.ResponseWriter, r *http.Request) bool {
manager.lock.Lock()
defer manager.lock.Unlock()
cookie, err := r.Cookie(manager.cookieName)
if err != nil || cookie.Value == "" {
return false
}
sid, err := url.QueryUnescape(cookie.Value)
if err != nil {
return false
}
_, err = manager.provider.SessionRead(sid)
if err != nil {
return false
} else {
return true
}
}
func (manager *Manager) sessionId() string {
b := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, b); err != nil {
return ""
}
return base64.URLEncoding.EncodeToString(b)
}