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package internal
import (
"crypto/ed25519"
"encoding/base64"
"fmt"
"sync"
"time"
"github.com/matrix-org/dendrite/federationapi/api"
"github.com/matrix-org/dendrite/federationapi/queue"
"github.com/matrix-org/dendrite/federationapi/statistics"
"github.com/matrix-org/dendrite/federationapi/storage"
"github.com/matrix-org/dendrite/federationapi/storage/cache"
"github.com/matrix-org/dendrite/internal/caching"
roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/setup/config"
"github.com/matrix-org/gomatrix"
"github.com/matrix-org/gomatrixserverlib"
"github.com/sirupsen/logrus"
)
// FederationInternalAPI is an implementation of api.FederationInternalAPI
type FederationInternalAPI struct {
db storage.Database
cfg *config.FederationAPI
statistics *statistics.Statistics
rsAPI roomserverAPI.FederationRoomserverAPI
federation api.FederationClient
keyRing *gomatrixserverlib.KeyRing
queues *queue.OutgoingQueues
joins sync.Map // joins currently in progress
}
func NewFederationInternalAPI(
db storage.Database, cfg *config.FederationAPI,
rsAPI roomserverAPI.FederationRoomserverAPI,
federation api.FederationClient,
statistics *statistics.Statistics,
caches *caching.Caches,
queues *queue.OutgoingQueues,
keyRing *gomatrixserverlib.KeyRing,
) *FederationInternalAPI {
serverKeyDB, err := cache.NewKeyDatabase(db, caches)
if err != nil {
logrus.WithError(err).Panicf("failed to set up caching wrapper for server key database")
}
if keyRing == nil {
keyRing = &gomatrixserverlib.KeyRing{
KeyFetchers: []gomatrixserverlib.KeyFetcher{},
KeyDatabase: serverKeyDB,
}
addDirectFetcher := func() {
keyRing.KeyFetchers = append(
keyRing.KeyFetchers,
&gomatrixserverlib.DirectKeyFetcher{
Client: federation,
},
)
}
if cfg.PreferDirectFetch {
addDirectFetcher()
} else {
defer addDirectFetcher()
}
var b64e = base64.StdEncoding.WithPadding(base64.NoPadding)
for _, ps := range cfg.KeyPerspectives {
perspective := &gomatrixserverlib.PerspectiveKeyFetcher{
PerspectiveServerName: ps.ServerName,
PerspectiveServerKeys: map[gomatrixserverlib.KeyID]ed25519.PublicKey{},
Client: federation,
}
for _, key := range ps.Keys {
rawkey, err := b64e.DecodeString(key.PublicKey)
if err != nil {
logrus.WithError(err).WithFields(logrus.Fields{
"server_name": ps.ServerName,
"public_key": key.PublicKey,
}).Warn("Couldn't parse perspective key")
continue
}
perspective.PerspectiveServerKeys[key.KeyID] = rawkey
}
keyRing.KeyFetchers = append(keyRing.KeyFetchers, perspective)
logrus.WithFields(logrus.Fields{
"server_name": ps.ServerName,
"num_public_keys": len(ps.Keys),
}).Info("Enabled perspective key fetcher")
}
}
return &FederationInternalAPI{
db: db,
cfg: cfg,
rsAPI: rsAPI,
keyRing: keyRing,
federation: federation,
statistics: statistics,
queues: queues,
}
}
func (a *FederationInternalAPI) isBlacklistedOrBackingOff(s gomatrixserverlib.ServerName) (*statistics.ServerStatistics, error) {
stats := a.statistics.ForServer(s)
until, blacklisted := stats.BackoffInfo()
if blacklisted {
return stats, &api.FederationClientError{
Blacklisted: true,
}
}
now := time.Now()
if until != nil && now.Before(*until) {
return stats, &api.FederationClientError{
RetryAfter: time.Until(*until),
}
}
return stats, nil
}
func failBlacklistableError(err error, stats *statistics.ServerStatistics) (until time.Time, blacklisted bool) {
if err == nil {
return
}
mxerr, ok := err.(gomatrix.HTTPError)
if !ok {
return stats.Failure()
}
if mxerr.Code == 401 { // invalid signature in X-Matrix header
return stats.Failure()
}
if mxerr.Code >= 500 && mxerr.Code < 600 { // internal server errors
return stats.Failure()
}
return
}
func (a *FederationInternalAPI) doRequestIfNotBackingOffOrBlacklisted(
s gomatrixserverlib.ServerName, request func() (interface{}, error),
) (interface{}, error) {
stats, err := a.isBlacklistedOrBackingOff(s)
if err != nil {
return nil, err
}
res, err := request()
if err != nil {
until, blacklisted := failBlacklistableError(err, stats)
now := time.Now()
var retryAfter time.Duration
if until.After(now) {
retryAfter = time.Until(until)
}
return res, &api.FederationClientError{
Err: err.Error(),
Blacklisted: blacklisted,
RetryAfter: retryAfter,
}
}
stats.Success()
return res, nil
}
func (a *FederationInternalAPI) doRequestIfNotBlacklisted(
s gomatrixserverlib.ServerName, request func() (interface{}, error),
) (interface{}, error) {
stats := a.statistics.ForServer(s)
if _, blacklisted := stats.BackoffInfo(); blacklisted {
return stats, &api.FederationClientError{
Err: fmt.Sprintf("server %q is blacklisted", s),
Blacklisted: true,
}
}
return request()
}
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