// Save implements wcg.SessionStore#Save
func (s *SessionStore) Save(sess *wcg.Session) error {
encoded, err := sess.Encode()
if err != nil {
return err
}
item := &EncodedSession{
[]byte(encoded),
}
key := datastore.NewKey(s.ctx, "EncodedSession", string(sess.ID), 0, nil)
_, err = datastore.Put(s.ctx, key, item)
return err
}
// SessionSupportWithConfig returns two middleware functions for session support, which need to be registered
// on route.Before and route.After.
//
// Example:
//
// sprepare, scomplete := SessionSupport()
//
// route.Before(sprepare)
// route.After(scomplete)
//
func SessionSupportWithConfig(cfg *SessionConfig) (wcg.Handler, wcg.Handler) {
if cfg.StoreFactory == nil {
memorystore := wcg.NewMemorySessionStore()
cfg.StoreFactory = func(req *wcg.Request) wcg.SessionStore {
req.Logger.Warnf("Memory SessionStore is used so that the session data would lost suddenly.")
req.Logger.Warnf("If you are in GAE environment (including devserver), you must use GAESessionStoreFactory")
return memorystore
}
}
// load handler loads the session data from backend storage.
load := func(res *wcg.Response, req *wcg.Request) {
if res.IsClosed() {
return
}
var sess *wcg.Session
var err error
store := cfg.StoreFactory(req)
c, err := req.SignedCookie(cfg.CookieName, cfg.Key)
if err != nil {
req.Logger.Debugf("Could not decode the signed cookie on %s: %v", cfg.Key, err)
}
if c != nil {
if wcg.IsUUID(c.Value) {
sess, err = store.Load(wcg.UUID(c.Value))
}
if err != nil {
req.Logger.Warnf(
"Could not load the session (id: %q) from the store (%v), use a new session.",
err, c.Value)
sess = nil
c = nil
} else {
if sess == nil {
req.Logger.Debugf("Session data for %q was not found on backend.", c.Value)
} else {
req.Logger.Debugf("Session data for %q found.", c.Value)
expiredAt := sess.Timestamp.Add(time.Duration(cfg.MaxAge) * time.Second)
if expiredAt.Before(time.Now()) {
// expired
req.Logger.Infof("Session data for %q is found but expired.", c.Value)
if _, err := store.Delete(sess.ID); err != nil {
req.Logger.Errorf("An error occurred while deleting the expired session (%q): %v", sess.ID, err)
}
sess = nil
}
}
}
}
if c == nil {
// no cookie found
c = &http.Cookie{}
c.Name = cfg.CookieName
c.HttpOnly = cfg.HTTPOnly
c.MaxAge = cfg.MaxAge
if cfg.Domain != "" {
c.Domain = cfg.Domain
}
}
c.Path = cfg.Path
// No session found
if sess == nil {
sess = wcg.NewSession(req)
sess.Timestamp = time.Now()
req.Logger.Debugf("Creating the new session.")
store := cfg.StoreFactory(req)
err := store.Save(sess)
if err != nil {
res.RenderInternalError("New Session could not be created: %v", err)
return
}
} else {
// Update the timestamp.
sess.Timestamp = time.Now()
}
// Set the cookie data
c.Value = string(sess.ID)
c.Expires = sess.Timestamp.Add(time.Duration(cfg.MaxAge) * time.Second)
c.MaxAge = cfg.MaxAge
req.Session = sess
encoded, _ := sess.Encode()
req.SetLocal("__session_support", encoded)
res.SetSignedCookie(c, cfg.Key)
}
// save handler store the cookie data into backend storage.
save := func(res *wcg.Response, req *wcg.Request) {
if encoded, ok := req.Local("__session_support").(string); ok {
nencoded, _ := req.Session.Encode()
// Store session if it is changed.
if encoded != nencoded {
store := cfg.StoreFactory(req)
err := store.Save(req.Session)
if err != nil {
// TODO: log session error
req.Logger.Errorf("Could not save the session data on backend: %v", err)
} else {
req.Logger.Debugf("Successfully stored the session data on backend.")
}
} else {
req.Logger.Debugf("Session is not changed, skipped to be stored.")
}
}
}
return wcg.NewNamedHandler("Session.Load", load), wcg.NewNamedHandler("Session.Save", save)
}