1 files changed, 98 insertions, 0 deletions
diff --git a/services/auth/source/oauth2/store.go b/services/auth/source/oauth2/store.go
new file mode 100644
index 0000000..e031653
--- /dev/null
+++ b/services/auth/source/oauth2/store.go
@@ -0,0 +1,98 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package oauth2
+
+import (
+	"encoding/gob"
+	"fmt"
+	"net/http"
+
+	"code.gitea.io/gitea/modules/log"
+	session_module "code.gitea.io/gitea/modules/session"
+
+	chiSession "code.forgejo.org/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 {
+		_, _ = session_module.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{}