forked from heroiclabs/nakama
/
session_cache.go
184 lines (161 loc) · 4.5 KB
/
session_cache.go
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// Copyright 2021 The Nakama Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"context"
"sync"
"time"
"github.com/gofrs/uuid"
)
type SessionCache interface {
Stop()
// Check if a given user, expiry, and session token combination is valid.
IsValidSession(userID uuid.UUID, exp int64, token string) bool
// Check if a given user, expiry, and refresh token combination is valid.
IsValidRefresh(userID uuid.UUID, exp int64, token string) bool
// Add a valid session and/or refresh token for a given user.
Add(userID uuid.UUID, sessionExp int64, sessionToken string, refreshExp int64, refreshToken string)
// Remove a session and/or refresh token for a given user.
Remove(userID uuid.UUID, sessionExp int64, sessionToken string, refreshExp int64, refreshToken string)
// Remove all of a user's session and refresh tokens.
RemoveAll(userID uuid.UUID)
// Mark a set of users as banned.
Ban(userIDs []uuid.UUID)
// Unban a set of users.
Unban(userIDs []uuid.UUID)
}
type sessionCacheUser struct {
sessionTokens map[string]int64
refreshTokens map[string]int64
}
type LocalSessionCache struct {
sync.RWMutex
config Config
ctx context.Context
ctxCancelFn context.CancelFunc
cache map[uuid.UUID]*sessionCacheUser
}
func NewLocalSessionCache(config Config) SessionCache {
ctx, ctxCancelFn := context.WithCancel(context.Background())
s := &LocalSessionCache{
config: config,
ctx: ctx,
ctxCancelFn: ctxCancelFn,
cache: make(map[uuid.UUID]*sessionCacheUser),
}
go func() {
ticker := time.NewTicker(2 * time.Duration(config.GetSession().TokenExpirySec) * time.Second)
for {
select {
case <-s.ctx.Done():
ticker.Stop()
return
case t := <-ticker.C:
tMs := t.UTC().Unix()
s.Lock()
for userID, cache := range s.cache {
for token, exp := range cache.sessionTokens {
if exp <= tMs {
delete(cache.sessionTokens, token)
}
}
for token, exp := range cache.refreshTokens {
if exp <= tMs {
delete(cache.refreshTokens, token)
}
}
if len(cache.sessionTokens) == 0 && len(cache.refreshTokens) == 0 {
delete(s.cache, userID)
}
}
s.Unlock()
}
}
}()
return s
}
func (s *LocalSessionCache) Stop() {
s.ctxCancelFn()
}
func (s *LocalSessionCache) IsValidSession(userID uuid.UUID, exp int64, token string) bool {
s.RLock()
cache, found := s.cache[userID]
if !found {
s.RUnlock()
return false
}
_, found = cache.sessionTokens[token]
s.RUnlock()
return found
}
func (s *LocalSessionCache) IsValidRefresh(userID uuid.UUID, exp int64, token string) bool {
s.RLock()
cache, found := s.cache[userID]
if !found {
s.RUnlock()
return false
}
_, found = cache.refreshTokens[token]
s.RUnlock()
return found
}
func (s *LocalSessionCache) Add(userID uuid.UUID, sessionExp int64, sessionToken string, refreshExp int64, refreshToken string) {
s.Lock()
cache, found := s.cache[userID]
if !found {
cache = &sessionCacheUser{
sessionTokens: make(map[string]int64),
refreshTokens: make(map[string]int64),
}
s.cache[userID] = cache
}
if sessionToken != "" {
cache.sessionTokens[sessionToken] = sessionExp + 1
}
if refreshToken != "" {
cache.refreshTokens[refreshToken] = refreshExp + 1
}
s.Unlock()
}
func (s *LocalSessionCache) Remove(userID uuid.UUID, sessionExp int64, sessionToken string, refreshExp int64, refreshToken string) {
s.Lock()
cache, found := s.cache[userID]
if !found {
s.Unlock()
return
}
if sessionToken != "" {
delete(cache.sessionTokens, sessionToken)
}
if refreshToken != "" {
delete(cache.refreshTokens, refreshToken)
}
if len(cache.sessionTokens) == 0 && len(cache.refreshTokens) == 0 {
delete(s.cache, userID)
}
s.Unlock()
}
func (s *LocalSessionCache) RemoveAll(userID uuid.UUID) {
s.Lock()
delete(s.cache, userID)
s.Unlock()
}
func (s *LocalSessionCache) Ban(userIDs []uuid.UUID) {
s.Lock()
for _, userID := range userIDs {
delete(s.cache, userID)
}
s.Unlock()
}
func (s *LocalSessionCache) Unban(userIDs []uuid.UUID) {}