Session Manager

Table of Contents

• About
• Install
• Usage
• Example

About

Light-weight session in-memory session manager for golang

Install

$ go get github.com/vpatel95/session-manager

Usage

1. Import the package using

   import sm "github.com/vpatel95/session-manager"

2. Create a SessionManager object

   manager := sm.New()
   
   // The default configs for session manager and cookie will be as follow
   Config: SessionManagerConfig{
   	CleanerInterval:    1 * time.Minute,
   	MaxLifetime:        24 * time.Hour,
   	EnableHttpHeader:   false,
   	SessionHeader:      "",
   	AutoRefreshSession: false,
   },
   Cookie: SessionCookie{
   	Name:     "sessionid",
   	Domain:   "",
   	HTTPOnly: true,
   	Secure:   false,
   	Lifetime: 24 * time.Hour,
   },

3. SessionManager Operations

   func (sm *SessionManager) GetSessionId(r *http.Request) (string, error) 		// extract session ID from request
   func (sm *SessionManager) ListSessions() 				    		// Print all the sessions in the manager
   func (sm *SessionManager) SessionCount() int			    		// returns number of sessions in the manager
   func (sm *SessionManager) SessionRefresh(oldSid, sid string) (*Session, error)	// change the session Id for the session
   func (sm *SessionManager) SessionExist(sid string) bool				// check if session with session Id exists
   func (sm *SessionManager) SessionUpdate(sid string) error 				// update last access time for the session
   func (sm *SessionManager) SessionDestroy(sid string) error 				// delete session with given session Id
   func (sm *SessionManager) SessionRead(r *http.Request) (*Session, error) 		// retreive the session
   func (sm *SessionManager) SessionCreate(sid string) (*Session, error) 		// create a new session
   func (sm *SessionManager) SessionReadOrCreate(r *http.Request) (*Session, error)    // retreive the session, if not existing create a new session

4. Session operations

   func (s *Session) Get(key interface{}) interface{}	// to get value for 'key' from the session
   func (s *Session) Set(key, sd interface{}) error    // to set value for 'key in the session
   func (s *Session) Exist(key interface{}) bool      	// returns bool if 'key' exists in the session
   func (s *Session) Delete(key interface{}) error     // delete 'key' from the session
   

Example

This is an example of a middleware that verifies the session and sets "user" key in the session

func ValidateSessionID(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		sessId, err := sessManager.GetSessionId(r)
		if err != nil {
			next.ServeHTTP(w, r)
			return
		}

		data, err := getTokenData(sessId)
		if err != nil {
			next.ServeHTTP(w, r)
			return
		}

		var user User
		user.Load(data["user"].(JSON))

		sess, err := sessManager.SessionReadOrCreate(r)
		if err != nil {
			log.Println("[ValidateSessionID] ::: Failed to get session : " + err.Error())
			next.ServeHTTP(w, r)
			return
		}

		sess.Set("user", user)
		next.ServeHTTP(w, r)
	})
}