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// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package oauth2
import (
"encoding/gob"
"fmt"
"net/http"
"code.gitea.io/gitea/modules/log"
chiSession "gitea.com/go-chi/session"
"github.com/gorilla/sessions"
)
// SessionsStore creates a gothic store from our session
type SessionsStore struct {
maxLength int64
}
// Get should return a cached session.
func (st *SessionsStore) Get(r *http.Request, name string) (*sessions.Session, error) {
return st.getOrNew(r, name, false)
}
// New should create and return a new session.
//
// Note that New should never return a nil session, even in the case of
// an error if using the Registry infrastructure to cache the session.
func (st *SessionsStore) New(r *http.Request, name string) (*sessions.Session, error) {
return st.getOrNew(r, name, true)
}
// getOrNew gets the session from the chi-session if it exists. Override permits the overriding of an unexpected object.
func (st *SessionsStore) getOrNew(r *http.Request, name string, override bool) (*sessions.Session, error) {
chiStore := chiSession.GetSession(r)
session := sessions.NewSession(st, name)
rawData := chiStore.Get(name)
if rawData != nil {
oldSession, ok := rawData.(*sessions.Session)
if ok {
session.ID = oldSession.ID
session.IsNew = oldSession.IsNew
session.Options = oldSession.Options
session.Values = oldSession.Values
return session, nil
} else if !override {
log.Error("Unexpected object in session at name: %s: %v", name, rawData)
return nil, fmt.Errorf("unexpected object in session at name: %s", name)
}
}
session.IsNew = override
session.ID = chiStore.ID() // Simply copy the session id from the chi store
return session, chiStore.Set(name, session)
}
// Save should persist session to the underlying store implementation.
func (st *SessionsStore) Save(r *http.Request, w http.ResponseWriter, session *sessions.Session) error {
chiStore := chiSession.GetSession(r)
if session.IsNew {
_, _ = chiSession.RegenerateSession(w, r)
session.IsNew = false
}
if err := chiStore.Set(session.Name(), session); err != nil {
return err
}
if st.maxLength > 0 {
sizeWriter := &sizeWriter{}
_ = gob.NewEncoder(sizeWriter).Encode(session)
if sizeWriter.size > st.maxLength {
return fmt.Errorf("encode session: Data too long: %d > %d", sizeWriter.size, st.maxLength)
}
}
return chiStore.Release()
}
type sizeWriter struct {
size int64
}
func (s *sizeWriter) Write(data []byte) (int, error) {
s.size += int64(len(data))
return len(data), nil
}
var _ (sessions.Store) = &SessionsStore{}
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