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sessionPersistance.go
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/
sessionPersistance.go
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package session
import (
"fmt"
"strconv"
"strings"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/go-redis/redis"
)
type Persistance interface {
BlackList(username string, token string, exp float64) error
IsBlackListed(username string, token string) (bool, error)
Store(username string, token string, exp int64) error
BlackListAll(username string) error
}
type inMemorySessionPersistance struct {
RedisClient *redis.Client
logger log.Logger
}
func NewInMemorySessionPersistance(addr, password string, logger log.Logger) (*inMemorySessionPersistance, error) {
redisClient := redis.NewClient(&redis.Options{
Addr: addr,
Password: password,
DB: 0, // use default DB
})
_, err := redisClient.Ping().Result()
if err != nil {
return nil, err
}
return &inMemorySessionPersistance{
RedisClient: redisClient,
logger: logger,
}, nil
}
func (p inMemorySessionPersistance) IsBlackListed(username string, token string) (bool, error) {
list, err := p.RedisClient.LRange("invalid__"+username, 0, -1).Result()
if err != nil {
return false, err
}
isBlackListed := false
for _, pair := range list {
elements := strings.Split(pair, ",")
if len(elements) != 2 {
level.Warn(p.logger).Log("message", "Redis format error")
continue
}
if elements[0] == token {
isBlackListed = true
}
unixTimeSeconds, err := strconv.ParseInt(elements[1], 10, 64)
if err != nil {
return false, err
}
if time.Unix(unixTimeSeconds, 0).Before(time.Now().UTC()) {
err = p.RedisClient.LRem("invalid__"+username, 0, pair).Err()
if err != nil {
return false, err
}
}
}
return isBlackListed, nil
}
func (p inMemorySessionPersistance) BlackList(username string, token string, exp float64) error {
values := []string{token, strconv.FormatFloat(exp, 'f', 0, 64)}
searchPair := strings.Join(values, ",")
list, err := p.RedisClient.LRange("valid__"+username, 0, -1).Result()
if err != nil {
return err
}
for _, pair := range list {
elements := strings.Split(pair, ",")
if len(elements) != 2 {
panic(fmt.Errorf("%s", "Redis format error"))
continue
}
unixTimeSeconds, err := strconv.ParseInt(elements[1], 10, 64)
if err != nil {
return err
}
// Wenn gefunden und noch nicht abgelaufen, dann einfügen
if searchPair == pair && time.Unix(unixTimeSeconds, 0).After(time.Now().UTC()) {
err = p.RedisClient.RPush("invalid__"+username, pair).Err()
if err != nil {
return err
}
}
// Wenn gefunden oder abgelaufen, dann entfernen
if searchPair == pair || time.Unix(unixTimeSeconds, 0).Before(time.Now().UTC()) {
err = p.RedisClient.LRem("valid__"+username, 0, pair).Err()
if err != nil {
return err
}
}
}
return nil
}
func (p inMemorySessionPersistance) Store(username string, token string, exp int64) error {
values := []string{token, strconv.FormatInt(exp, 10)}
return p.RedisClient.RPush("valid__"+username, strings.Join(values, ",")).Err()
}
func (p inMemorySessionPersistance) BlackListAll(username string) error {
list, err := p.RedisClient.LRange("valid__"+username, 0, -1).Result()
if err != nil {
return err
}
for _, pair := range list {
elements := strings.Split(pair, ",")
if len(elements) != 2 {
continue
}
unixTimeSeconds, err := strconv.ParseInt(elements[1], 10, 64)
if err != nil {
return err
}
err = p.RedisClient.LRem("valid__"+username, 0, pair).Err()
if err != nil {
return err
}
if time.Unix(unixTimeSeconds, 0).After(time.Now().UTC()) {
err = p.RedisClient.RPush("invalid__"+username, pair).Err()
if err != nil {
return err
}
}
}
return nil
}
func (p inMemorySessionPersistance) Persist() error {
return p.RedisClient.BgSave().Err()
}