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/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package router
import (
"crypto/rand"
"errors"
"fmt"
"github.com/gin-contrib/sessions"
"github.com/gin-contrib/sessions/memstore"
"github.com/gin-gonic/gin"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
)
func useSession(cfg *config.Config, dbService db.DB, engine *gin.Engine) error {
// check if we have a saved router session already
routerSessions := []*gtsmodel.RouterSession{}
if err := dbService.GetAll(&routerSessions); err != nil {
if _, ok := err.(db.ErrNoEntries); !ok {
// proper error occurred
return err
}
}
var rs *gtsmodel.RouterSession
if len(routerSessions) == 1 {
// we have a router session stored
rs = routerSessions[0]
} else if len(routerSessions) == 0 {
// we have no router sessions so we need to create a new one
var err error
rs, err = routerSession(dbService)
if err != nil {
return fmt.Errorf("error creating new router session: %s", err)
}
} else {
// we should only have one router session stored ever
return errors.New("we had more than one router session in the db")
}
if rs == nil {
return errors.New("error getting or creating router session: router session was nil")
}
store := memstore.NewStore(rs.Auth, rs.Crypt)
sessionName := fmt.Sprintf("gotosocial-%s", cfg.Host)
engine.Use(sessions.Sessions(sessionName, store))
return nil
}
// routerSession generates a new router session with random auth and crypt bytes,
// puts it in the database for persistence, and returns it for use.
func routerSession(dbService db.DB) (*gtsmodel.RouterSession, error) {
auth := make([]byte, 32)
crypt := make([]byte, 32)
if _, err := rand.Read(auth); err != nil {
return nil, err
}
if _, err := rand.Read(crypt); err != nil {
return nil, err
}
rid, err := id.NewULID()
if err != nil {
return nil, err
}
rs := >smodel.RouterSession{
ID: rid,
Auth: auth,
Crypt: crypt,
}
if err := dbService.Put(rs); err != nil {
return nil, err
}
return rs, nil
}
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