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// +build !confonly
package vmess
import (
"strings"
"sync"
"time"
"v2ray.com/core/common"
"v2ray.com/core/common/protocol"
"v2ray.com/core/common/serial"
"v2ray.com/core/common/task"
)
const (
updateInterval = 10 * time.Second
cacheDurationSec = 120
)
type user struct {
user protocol.MemoryUser
lastSec protocol.Timestamp
}
// TimedUserValidator is a user Validator based on time.
type TimedUserValidator struct {
sync.RWMutex
users []*user
userHash map[[16]byte]indexTimePair
hasher protocol.IDHash
baseTime protocol.Timestamp
task *task.Periodic
}
type indexTimePair struct {
user *user
timeInc uint32
}
// NewTimedUserValidator creates a new TimedUserValidator.
func NewTimedUserValidator(hasher protocol.IDHash) *TimedUserValidator {
tuv := &TimedUserValidator{
users: make([]*user, 0, 16),
userHash: make(map[[16]byte]indexTimePair, 1024),
hasher: hasher,
baseTime: protocol.Timestamp(time.Now().Unix() - cacheDurationSec*2),
}
tuv.task = &task.Periodic{
Interval: updateInterval,
Execute: func() error {
tuv.updateUserHash()
return nil
},
}
common.Must(tuv.task.Start())
return tuv
}
func (v *TimedUserValidator) generateNewHashes(nowSec protocol.Timestamp, user *user) {
var hashValue [16]byte
genEndSec := nowSec + cacheDurationSec
genHashForID := func(id *protocol.ID) {
idHash := v.hasher(id.Bytes())
genBeginSec := user.lastSec
if genBeginSec < nowSec-cacheDurationSec {
genBeginSec = nowSec - cacheDurationSec
}
for ts := genBeginSec; ts <= genEndSec; ts++ {
common.Must2(serial.WriteUint64(idHash, uint64(ts)))
idHash.Sum(hashValue[:0])
idHash.Reset()
v.userHash[hashValue] = indexTimePair{
user: user,
timeInc: uint32(ts - v.baseTime),
}
}
}
account := user.user.Account.(*MemoryAccount)
genHashForID(account.ID)
for _, id := range account.AlterIDs {
genHashForID(id)
}
user.lastSec = genEndSec
}
func (v *TimedUserValidator) removeExpiredHashes(expire uint32) {
for key, pair := range v.userHash {
if pair.timeInc < expire {
delete(v.userHash, key)
}
}
}
func (v *TimedUserValidator) updateUserHash() {
now := time.Now()
nowSec := protocol.Timestamp(now.Unix())
v.Lock()
defer v.Unlock()
for _, user := range v.users {
v.generateNewHashes(nowSec, user)
}
expire := protocol.Timestamp(now.Unix() - cacheDurationSec)
if expire > v.baseTime {
v.removeExpiredHashes(uint32(expire - v.baseTime))
}
}
func (v *TimedUserValidator) Add(u *protocol.MemoryUser) error {
v.Lock()
defer v.Unlock()
nowSec := time.Now().Unix()
uu := &user{
user: *u,
lastSec: protocol.Timestamp(nowSec - cacheDurationSec),
}
v.users = append(v.users, uu)
v.generateNewHashes(protocol.Timestamp(nowSec), uu)
return nil
}
func (v *TimedUserValidator) Get(userHash []byte) (*protocol.MemoryUser, protocol.Timestamp, bool) {
defer v.RUnlock()
v.RLock()
var fixedSizeHash [16]byte
copy(fixedSizeHash[:], userHash)
pair, found := v.userHash[fixedSizeHash]
if found {
var user protocol.MemoryUser
user = pair.user.user
return &user, protocol.Timestamp(pair.timeInc) + v.baseTime, true
}
return nil, 0, false
}
func (v *TimedUserValidator) Remove(email string) bool {
v.Lock()
defer v.Unlock()
email = strings.ToLower(email)
idx := -1
for i, u := range v.users {
if strings.EqualFold(u.user.Email, email) {
idx = i
break
}
}
if idx == -1 {
return false
}
ulen := len(v.users)
v.users[idx] = v.users[ulen-1]
v.users[ulen-1] = nil
v.users = v.users[:ulen-1]
return true
}
// Close implements common.Closable.
func (v *TimedUserValidator) Close() error {
return v.task.Close()
}