1
0
mirror of https://github.com/astaxie/beego.git synced 2024-11-29 11:21:29 +00:00
Beego/session/session.go
2014-01-08 23:24:31 +08:00

236 lines
6.5 KiB
Go

package session
import (
"crypto/hmac"
"crypto/md5"
"crypto/rand"
"crypto/sha1"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"time"
)
type SessionStore interface {
Set(key, value interface{}) error //set session value
Get(key interface{}) interface{} //get session value
Delete(key interface{}) error //delete session value
SessionID() string //back current sessionID
SessionRelease(w http.ResponseWriter) // release the resource & save data to provider & return the data
Flush() error //delete all data
}
type Provider interface {
SessionInit(gclifetime int64, config string) error
SessionRead(sid string) (SessionStore, error)
SessionExist(sid string) bool
SessionRegenerate(oldsid, sid string) (SessionStore, error)
SessionDestroy(sid string) error
SessionAll() int //get all active session
SessionGC()
}
var provides = make(map[string]Provider)
// Register makes a session provide available by the provided name.
// If Register is called twice with the same name or if driver is nil,
// it panics.
func Register(name string, provide Provider) {
if provide == nil {
panic("session: Register provide is nil")
}
if _, dup := provides[name]; dup {
panic("session: Register called twice for provider " + name)
}
provides[name] = provide
}
type managerConfig struct {
CookieName string `json:"cookieName"`
EnableSetCookie bool `json:"enableSetCookie,omitempty"`
Gclifetime int64 `json:"gclifetime"`
Maxlifetime int64 `json:"maxLifetime"`
Maxage int `json:"maxage"`
Secure bool `json:"secure"`
SessionIDHashFunc string `json:"sessionIDHashFunc"`
SessionIDHashKey string `json:"sessionIDHashKey"`
CookieLifeTime int64 `json:"cookieLifeTime"`
ProviderConfig string `json:"providerConfig"`
}
type Manager struct {
provider Provider
config *managerConfig
}
//options
//1. is https default false
//2. hashfunc default sha1
//3. hashkey default beegosessionkey
//4. maxage default is none
func NewManager(provideName, config string) (*Manager, error) {
provider, ok := provides[provideName]
if !ok {
return nil, fmt.Errorf("session: unknown provide %q (forgotten import?)", provideName)
}
cf := new(managerConfig)
cf.EnableSetCookie = true
err := json.Unmarshal([]byte(config), cf)
if err != nil {
return nil, err
}
if cf.Maxlifetime == 0 {
cf.Maxlifetime = cf.Gclifetime
}
err = provider.SessionInit(cf.Maxlifetime, cf.ProviderConfig)
if err != nil {
return nil, err
}
if cf.SessionIDHashFunc == "" {
cf.SessionIDHashFunc = "sha1"
}
if cf.SessionIDHashKey == "" {
cf.SessionIDHashKey = string(generateRandomKey(16))
}
return &Manager{
provider,
cf,
}, nil
}
//get Session
func (manager *Manager) SessionStart(w http.ResponseWriter, r *http.Request) (session SessionStore) {
cookie, err := r.Cookie(manager.config.CookieName)
if err != nil || cookie.Value == "" {
sid := manager.sessionId(r)
session, _ = manager.provider.SessionRead(sid)
cookie = &http.Cookie{Name: manager.config.CookieName,
Value: url.QueryEscape(sid),
Path: "/",
HttpOnly: true,
Secure: manager.config.Secure}
if manager.config.Maxage >= 0 {
cookie.MaxAge = manager.config.Maxage
}
if manager.config.EnableSetCookie {
http.SetCookie(w, cookie)
}
r.AddCookie(cookie)
} else {
sid, _ := url.QueryUnescape(cookie.Value)
if manager.provider.SessionExist(sid) {
session, _ = manager.provider.SessionRead(sid)
} else {
sid = manager.sessionId(r)
session, _ = manager.provider.SessionRead(sid)
cookie = &http.Cookie{Name: manager.config.CookieName,
Value: url.QueryEscape(sid),
Path: "/",
HttpOnly: true,
Secure: manager.config.Secure}
if manager.config.Maxage >= 0 {
cookie.MaxAge = manager.config.Maxage
}
if manager.config.EnableSetCookie {
http.SetCookie(w, cookie)
}
r.AddCookie(cookie)
}
}
return
}
//Destroy sessionid
func (manager *Manager) SessionDestroy(w http.ResponseWriter, r *http.Request) {
cookie, err := r.Cookie(manager.config.CookieName)
if err != nil || cookie.Value == "" {
return
} else {
manager.provider.SessionDestroy(cookie.Value)
expiration := time.Now()
cookie := http.Cookie{Name: manager.config.CookieName,
Path: "/",
HttpOnly: true,
Expires: expiration,
MaxAge: -1}
http.SetCookie(w, &cookie)
}
}
func (manager *Manager) GetProvider(sid string) (sessions SessionStore, err error) {
sessions, err = manager.provider.SessionRead(sid)
return
}
func (manager *Manager) GC() {
manager.provider.SessionGC()
time.AfterFunc(time.Duration(manager.config.Gclifetime)*time.Second, func() { manager.GC() })
}
func (manager *Manager) SessionRegenerateId(w http.ResponseWriter, r *http.Request) (session SessionStore) {
sid := manager.sessionId(r)
cookie, err := r.Cookie(manager.config.CookieName)
if err != nil && cookie.Value == "" {
//delete old cookie
session, _ = manager.provider.SessionRead(sid)
cookie = &http.Cookie{Name: manager.config.CookieName,
Value: url.QueryEscape(sid),
Path: "/",
HttpOnly: true,
Secure: manager.config.Secure,
}
} else {
oldsid, _ := url.QueryUnescape(cookie.Value)
session, _ = manager.provider.SessionRegenerate(oldsid, sid)
cookie.Value = url.QueryEscape(sid)
cookie.HttpOnly = true
cookie.Path = "/"
}
if manager.config.Maxage >= 0 {
cookie.MaxAge = manager.config.Maxage
}
http.SetCookie(w, cookie)
r.AddCookie(cookie)
return
}
func (manager *Manager) GetActiveSession() int {
return manager.provider.SessionAll()
}
func (manager *Manager) SetHashFunc(hasfunc, hashkey string) {
manager.config.SessionIDHashFunc = hasfunc
manager.config.SessionIDHashKey = hashkey
}
func (manager *Manager) SetSecure(secure bool) {
manager.config.Secure = secure
}
//remote_addr cruunixnano randdata
func (manager *Manager) sessionId(r *http.Request) (sid string) {
bs := make([]byte, 24)
if _, err := io.ReadFull(rand.Reader, bs); err != nil {
return ""
}
sig := fmt.Sprintf("%s%d%s", r.RemoteAddr, time.Now().UnixNano(), bs)
if manager.config.SessionIDHashFunc == "md5" {
h := md5.New()
h.Write([]byte(sig))
sid = hex.EncodeToString(h.Sum(nil))
} else if manager.config.SessionIDHashFunc == "sha1" {
h := hmac.New(sha1.New, []byte(manager.config.SessionIDHashKey))
fmt.Fprintf(h, "%s", sig)
sid = hex.EncodeToString(h.Sum(nil))
} else {
h := hmac.New(sha1.New, []byte(manager.config.SessionIDHashKey))
fmt.Fprintf(h, "%s", sig)
sid = hex.EncodeToString(h.Sum(nil))
}
return
}