package caching import ( "fmt" "github.com/matrix-org/gomatrixserverlib" ) const ( ServerKeyCacheName = "server_key" ServerKeyCacheMaxEntries = 4096 ServerKeyCacheMutable = true ServerKeyCacheMaxAge = CacheNoMaxAge ) // ServerKeyCache contains the subset of functions needed for // a server key cache. type ServerKeyCache interface { // request -> timestamp is emulating gomatrixserverlib.FetchKeys: // https://github.com/matrix-org/gomatrixserverlib/blob/f69539c86ea55d1e2cc76fd8e944e2d82d30397c/keyring.go#L95 // The timestamp should be the timestamp of the event that is being // verified. We will not return keys from the cache that are not valid // at this timestamp. GetServerKey(request gomatrixserverlib.PublicKeyLookupRequest, timestamp gomatrixserverlib.Timestamp) (response gomatrixserverlib.PublicKeyLookupResult, ok bool) // request -> result is emulating gomatrixserverlib.StoreKeys: // https://github.com/matrix-org/gomatrixserverlib/blob/f69539c86ea55d1e2cc76fd8e944e2d82d30397c/keyring.go#L112 StoreServerKey(request gomatrixserverlib.PublicKeyLookupRequest, response gomatrixserverlib.PublicKeyLookupResult) } func (c Caches) GetServerKey( request gomatrixserverlib.PublicKeyLookupRequest, timestamp gomatrixserverlib.Timestamp, ) (gomatrixserverlib.PublicKeyLookupResult, bool) { key := fmt.Sprintf("%s/%s", request.ServerName, request.KeyID) val, found := c.ServerKeys.Get(key) if found && val != nil { if keyLookupResult, ok := val.(gomatrixserverlib.PublicKeyLookupResult); ok { if !keyLookupResult.WasValidAt(timestamp, true) { // The key wasn't valid at the requested timestamp so don't // return it. The caller will have to work out what to do. c.ServerKeys.Unset(key) return gomatrixserverlib.PublicKeyLookupResult{}, false } return keyLookupResult, true } } return gomatrixserverlib.PublicKeyLookupResult{}, false } func (c Caches) StoreServerKey( request gomatrixserverlib.PublicKeyLookupRequest, response gomatrixserverlib.PublicKeyLookupResult, ) { key := fmt.Sprintf("%s/%s", request.ServerName, request.KeyID) c.ServerKeys.Set(key, response) }