forked from boj/rethinkstore
/
rethinkstore.go
150 lines (135 loc) · 4.31 KB
/
rethinkstore.go
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// Copyright 2015 Brian "bojo" Jones. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package rethinkstore
import (
"bytes"
"encoding/base32"
"encoding/gob"
"errors"
"net/http"
"strings"
r "github.com/dancannon/gorethink"
"github.com/gorilla/securecookie"
"github.com/gorilla/sessions"
)
var ErrNoDatabase = errors.New("no databases available")
// Amount of time for keys to expire.
var sessionExpire = 86400 * 30
type RethinkSession struct {
Id string `gorethink:"id"`
Session []byte `gorethink:"session"`
}
// RethinkStore stores sessions in a rethinkdb backend.
type RethinkStore struct {
Rethink *r.Session // rethink session
Table string // table to store sessions in
Codecs []securecookie.Codec // session codecs
Options *sessions.Options // default configuration
DefaultMaxAge int // default TTL for a MaxAge == 0 session
}
// NewRethinkStore returns a new RethinkStore.
//
// Takes in the database address, database name, session table,
// max idle connections, max open connections, and session key pairs.
func NewRethinkStore(addr, db, table string, idle, open int, keyPairs ...[]byte) (*RethinkStore, error) {
session, err := r.Connect(r.ConnectOpts{
Address: addr,
Database: db,
MaxIdle: idle,
MaxOpen: open,
})
if err != nil {
return nil, err
}
return &RethinkStore{
Rethink: session,
Table: table,
Codecs: securecookie.CodecsFromPairs(keyPairs...),
Options: &sessions.Options{
Path: "/",
MaxAge: sessionExpire,
},
}, nil
}
// Close closes the underlying Rethink Client.
func (s *RethinkStore) Close() {
s.Rethink.Close()
}
// Get returns a session for the given name after adding it to the registry.
func (s *RethinkStore) Get(r *http.Request, name string) (*sessions.Session, error) {
return sessions.GetRegistry(r).Get(s, name)
}
// New returns a session for the given name without adding it to the registry.
func (s *RethinkStore) New(r *http.Request, name string) (*sessions.Session, error) {
var err error
session := sessions.NewSession(s, name)
session.Options = &(*s.Options)
session.IsNew = true
if c, errCookie := r.Cookie(name); errCookie == nil {
err = securecookie.DecodeMulti(name, c.Value, &session.ID, s.Codecs...)
if err == nil {
ok, err := s.load(session)
session.IsNew = !(err == nil && ok) // not new if no error and data available
}
}
return session, err
}
// Save adds a single session to the response.
func (s *RethinkStore) Save(r *http.Request, w http.ResponseWriter, session *sessions.Session) error {
// Marked for deletion.
if session.Options.MaxAge < 0 {
if err := s.delete(session); err != nil {
return err
}
http.SetCookie(w, sessions.NewCookie(session.Name(), "", session.Options))
} else {
// Build an alphanumeric key for the redis store.
if session.ID == "" {
session.ID = strings.TrimRight(base32.StdEncoding.EncodeToString(securecookie.GenerateRandomKey(32)), "=")
}
if err := s.save(session); err != nil {
return err
}
encoded, err := securecookie.EncodeMulti(session.Name(), session.ID, s.Codecs...)
if err != nil {
return err
}
http.SetCookie(w, sessions.NewCookie(session.Name(), encoded, session.Options))
}
return nil
}
// save stores the session in rethink.
func (s *RethinkStore) save(session *sessions.Session) error {
buf := new(bytes.Buffer)
enc := gob.NewEncoder(buf)
err := enc.Encode(session.Values)
if err != nil {
return err
}
age := session.Options.MaxAge
if age == 0 {
age = s.DefaultMaxAge
}
_, err = r.Table(s.Table).Insert(RethinkSession{Id: session.ID, Session: buf.Bytes()}).Run(s.Rethink)
return err
}
// load reads the session from rethink.
// returns true if there is session data in the DB.
func (s *RethinkStore) load(session *sessions.Session) (bool, error) {
var data RethinkSession
res, err := r.Table(s.Table).Get(session.ID).Run(s.Rethink)
if err != nil {
return false, err
}
if err := res.One(&data); err != nil {
return false, err
}
dec := gob.NewDecoder(bytes.NewBuffer(data.Session))
return true, dec.Decode(&session.Values)
}
// delete removes keys from rethink
func (s *RethinkStore) delete(session *sessions.Session) error {
_, err := r.Table(s.Table).Get(session.ID).Delete().Run(s.Rethink)
return err
}