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package router
import (
"encoding/base64"
"log/slog"
"sync"
"golang.org/x/crypto/argon2"
)
type ClientCache struct {
hashMap map[string]string
mutexLikeMap map[string]*sync.Mutex
mutexHashMap map[string]*sync.Mutex
likePageMap map[string]map[string]struct{}
salt []byte
}
var CCache *ClientCache
func NewClientCache(salt []byte) *ClientCache {
return &ClientCache{
hashMap: make(map[string]string),
mutexLikeMap: make(map[string]*sync.Mutex),
mutexHashMap: make(map[string]*sync.Mutex),
likePageMap: make(map[string]map[string]struct{}),
salt: salt,
}
}
func (c *ClientCache) GetHash(id string) string {
if val, ok := c.hashMap[id]; ok {
slog.Debug("gave an old hash", slog.String("hash", val))
return val
}
if _, ok := c.mutexHashMap[id]; !ok {
c.mutexHashMap[id] = &sync.Mutex{}
}
c.mutexHashMap[id].Lock()
defer c.mutexHashMap[id].Unlock()
if val, ok := c.hashMap[id]; ok {
slog.Debug("gave a newly generated hash", slog.String("hash", val))
return val
}
c.hashMap[id] = base64.RawStdEncoding.EncodeToString(argon2.IDKey([]byte(id), c.salt, 1, 64*1024, 4, 32))
slog.Debug("generated hash", slog.String("hash", c.hashMap[id]))
return c.hashMap[id]
}
func (c *ClientCache) GetLikeStatus(id string, page string) bool {
if _, ok := c.likePageMap[page]; !ok {
return false
}
_, ok := c.likePageMap[page][c.GetHash(id)]
return ok
}
func (c *ClientCache) LikeOn(id string, page string) (alreadyLiked bool) {
if _, ok := c.mutexLikeMap[id]; !ok {
c.mutexLikeMap[id] = &sync.Mutex{}
}
c.mutexLikeMap[id].Lock()
defer c.mutexLikeMap[id].Unlock()
hash := c.GetHash(id)
if userSet, ok := c.likePageMap[page]; ok {
_, alreadyLiked = userSet[hash]
c.likePageMap[page][hash] = struct{}{}
return
}
c.likePageMap[page] = make(map[string]struct{})
c.likePageMap[page][hash] = struct{}{}
return
}
func (c *ClientCache) LikeOff(id string, page string) (alreadyUnliked bool) {
if _, ok := c.mutexLikeMap[id]; !ok {
c.mutexLikeMap[id] = &sync.Mutex{}
}
c.mutexLikeMap[id].Lock()
defer c.mutexLikeMap[id].Unlock()
if _, ok := c.likePageMap[page]; !ok {
return true
}
hash := c.GetHash(id)
if _, ok := c.likePageMap[page][hash]; !ok {
return true
}
delete(c.likePageMap[page], hash)
return false
}
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