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package main
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"os"
"time"
)
type Session struct {
ID string
LoggedIn bool
Me string
AuthorizationEndpoint string
RedirectURI string
State string
NextURI string
}
func NewSession(w http.ResponseWriter, r *http.Request) (*Session, error) {
sessionID, err := getSessionCookie(w, r)
if err != nil {
return nil, err
}
session := &Session{ID: sessionID}
err = loadSession(session)
if err != nil {
return nil, err
}
return session, nil
}
func (sess *Session) Flush() error {
return saveSession(sess)
}
func saveSession(sess *Session) error {
filename := generateFilename(sess.ID)
err := os.Mkdir("session", 0755)
f, err := os.Create(filename)
if err != nil {
return err
}
defer f.Close()
err = json.NewEncoder(f).Encode(sess)
return err
}
func loadSession(sess *Session) error {
filename := generateFilename(sess.ID)
err := os.Mkdir("session", 0755)
f, err := os.Open(filename)
if err != nil {
if os.IsNotExist(err) {
// add defaults to session?
return nil
}
return err
}
defer f.Close()
err = json.NewDecoder(f).Decode(sess)
return err
}
func generateFilename(id string) string {
return fmt.Sprintf("session/%s.json", id)
}
func getSessionCookie(w http.ResponseWriter, r *http.Request) (string, error) {
c, err := r.Cookie("session")
var sessionVar string
if err != nil && errors.Is(err, http.ErrNoCookie) {
sessionVar = RandStringBytes(16)
c = &http.Cookie{
Name: "session",
Value: sessionVar,
Expires: time.Now().Add(24 * time.Hour),
Path: "/",
}
} else {
sessionVar = c.Value
c.Expires = time.Now().Add(24 * time.Hour)
}
http.SetCookie(w, c)
return sessionVar, nil
}