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|
package main
import (
"bytes"
"crypto/rand"
"encoding/hex"
"net/http"
"sync"
"time"
)
type TSession struct {
SessionID []byte
IPAddress string
Expires time.Time
AccountID int
}
// IMPORTANT(fusion): Ideally you'd save sessions in a database to reduce memory
// usage and to make them persistent with server restarts. In reality, we should
// have a low amount of sessions and a high server uptime, making the memory usage
// here minimal. We can always turn this into a LRU cache with a set maximum number
// of sessions.
var (
g_SessionsMutex sync.Mutex
g_Sessions []TSession
)
func GetRequestSessionID(Request *http.Request) []byte {
Cookie, Err := Request.Cookie("GOSESSID")
if Err != nil {
return nil
}
SessionID, Err := hex.DecodeString(Cookie.Value)
if Err != nil {
g_LogErr.Printf("Failed to decode session id: %v", Err)
return nil
}
if len(SessionID) != 32 {
g_LogErr.Printf("Invalid session id size %v (expected 32)", len(SessionID))
return nil
}
return SessionID
}
func SessionLookup(SessionID []byte, IPAddress string) int {
AccountID := 0
if SessionID != nil && IPAddress != "" {
g_SessionsMutex.Lock()
defer g_SessionsMutex.Unlock()
for Index := 0; Index < len(g_Sessions); Index += 1 {
Session := &g_Sessions[Index]
if time.Until(Session.Expires) <= 0 {
g_Sessions = SwapAndPop(g_Sessions, Index)
Index -= 1
continue
}
if bytes.Equal(Session.SessionID, SessionID) && Session.IPAddress == IPAddress {
AccountID = Session.AccountID
break
}
}
}
return AccountID
}
func SessionStart(Context *THttpRequestContext, AccountID int) {
if AccountID <= 0 {
g_LogErr.Printf("Trying to start session with invalid account id %v", AccountID)
return
}
SessionID := make([]byte, 32)
if _, Err := rand.Read(SessionID); Err != nil {
g_LogErr.Printf("Failed to generate session id: %v", Err)
return
}
Context.SessionID = SessionID
Context.AccountID = AccountID
Expires := time.Now().Add(time.Hour)
http.SetCookie(Context.Writer, &http.Cookie{
Name: "GOSESSID",
Value: hex.EncodeToString(SessionID),
Path: "/",
Expires: Expires,
Secure: false, // TODO(fusion): Enable this when HTTPS is enabled (?).
HttpOnly: true,
})
g_SessionsMutex.Lock()
defer g_SessionsMutex.Unlock()
g_Sessions = append(g_Sessions,
TSession{
SessionID: SessionID,
IPAddress: Context.IPAddress,
Expires: Expires,
AccountID: AccountID,
})
}
func SessionEnd(Context *THttpRequestContext) {
if Context.SessionID == nil {
return
}
http.SetCookie(Context.Writer, &http.Cookie{
Name: "GOSESSID",
Value: "",
Path: "/",
Expires: time.Unix(0, 0),
})
g_SessionsMutex.Lock()
defer g_SessionsMutex.Unlock()
for Index := 0; Index < len(g_Sessions); Index += 1 {
Session := &g_Sessions[Index]
if bytes.Equal(Session.SessionID, Context.SessionID) && Session.IPAddress == Context.IPAddress {
g_Sessions[Index] = g_Sessions[len(g_Sessions)-1]
g_Sessions[len(g_Sessions)-1] = TSession{}
g_Sessions = g_Sessions[:len(g_Sessions)-1]
break
}
}
}
|
