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manager.go
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manager.go
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package session
import (
"bytes"
"encoding/gob"
"sync"
"time"
"net/http"
"strings"
"github.com/pkg/errors"
"github.com/satori/go.uuid"
)
const DefaultCookieName = "GOSESSION"
const DefaultIPStrict = false
const DefaultTTL = 24 * time.Hour
var DefaultCookie = http.Cookie{
Name: DefaultCookieName,
MaxAge: int(DefaultTTL.Seconds()),
Path: "/",
}
type Manager struct {
emptyCookie http.Cookie
ipStrict bool
store Store
buf bytes.Buffer
enc *gob.Encoder
dec *gob.Decoder
sync.Mutex
}
func DefaultManager(store Store) *Manager {
return NewManager(DefaultCookie, DefaultIPStrict, store)
}
func NewManager(emptyCookie http.Cookie, ipStrict bool, store Store) *Manager {
m := &Manager{
emptyCookie: emptyCookie,
ipStrict: ipStrict,
store: store,
}
m.enc = gob.NewEncoder(&m.buf)
m.dec = gob.NewDecoder(&m.buf)
return m
}
func (m *Manager) marshal(v interface{}) ([]byte, error) {
m.Lock()
defer m.Unlock()
m.buf.Reset()
err := m.enc.Encode(v)
if err != nil {
return nil, err
}
return m.buf.Bytes(), nil
}
func (m *Manager) unmarshal(data []byte, v interface{}) error {
m.Lock()
defer m.Unlock()
m.buf.Reset()
m.buf.Write(data)
return m.dec.Decode(v)
}
func (m *Manager) get(session string) (map[string]interface{}, error) {
buf, err := m.store.Get(session)
if err != nil {
return nil, errors.Wrap(err, "Can't read session data from store")
}
values := make(map[string]interface{})
err = m.unmarshal(buf, &values)
if err != nil {
return nil, errors.Wrap(err, "Can't unmarshal session data given by store")
}
return values, nil
}
func (m *Manager) Get(session, key string) (interface{}, error) {
values, err := m.get(session)
if err != nil {
return nil, err
}
res := values[key]
return res, nil
}
func (m *Manager) set(session string, v map[string]interface{}) error {
buf, err := m.marshal(v)
if err != nil {
return errors.Wrap(err, "Can't marshal session object")
}
err = m.store.Set(session, buf, time.Duration(m.emptyCookie.MaxAge)*time.Second)
if err != nil {
return errors.Wrap(err, "Can't write session data to store")
}
return nil
}
func (m *Manager) Set(session, key string, v interface{}) error {
values, err := m.get(session)
if err != nil {
return err
}
values[key] = v
return m.set(session, values)
}
func (m *Manager) Delete(session string) error {
err := m.store.Delete(session)
if err != nil {
return errors.Wrap(err, "Can't delete session from store")
}
return nil
}
func (m *Manager) Session(w http.ResponseWriter, r *http.Request) *Session {
c, err := r.Cookie(m.emptyCookie.Name)
var name string
if err == nil {
name = c.Value
}
if len(name) != 36 {
hardening := r.UserAgent()
if m.ipStrict {
hardening += strings.SplitN(r.RemoteAddr, ":", 2)[0]
}
name = uuid.NewV5(uuid.NewV4(), hardening).String()
}
cookie := m.emptyCookie
cookie.Value = name
http.SetCookie(w, &cookie)
s := &Session{
name: name,
manager: m,
}
return s
}