dendrite/serverkeyapi/internal/api.go

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package internal
import (
"context"
"fmt"
"time"
"github.com/matrix-org/dendrite/serverkeyapi/api"
"github.com/matrix-org/gomatrixserverlib"
)
type ServerKeyAPI struct {
api.ServerKeyInternalAPI
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OurKeyRing gomatrixserverlib.KeyRing
FedClient *gomatrixserverlib.FederationClient
}
func (s *ServerKeyAPI) KeyRing() *gomatrixserverlib.KeyRing {
// Return a keyring that forces requests to be proxied through the
// below functions. That way we can enforce things like validity
// and keeping the cache up-to-date.
return &gomatrixserverlib.KeyRing{
KeyDatabase: s,
KeyFetchers: []gomatrixserverlib.KeyFetcher{s},
}
}
func (s *ServerKeyAPI) StoreKeys(
_ context.Context,
results map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult,
) error {
// Run in a background context - we don't want to stop this work just
// because the caller gives up waiting.
ctx := context.Background()
// Store any keys that we were given in our database.
return s.OurKeyRing.KeyDatabase.StoreKeys(ctx, results)
}
func (s *ServerKeyAPI) FetchKeys(
_ context.Context,
requests map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.Timestamp,
) (map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult, error) {
// Run in a background context - we don't want to stop this work just
// because the caller gives up waiting.
ctx := context.Background()
results := map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult{}
// First consult our local database and see if we have the requested
// keys. These might come from a cache, depending on the database
// implementation used.
now := gomatrixserverlib.AsTimestamp(time.Now())
if dbResults, err := s.OurKeyRing.KeyDatabase.FetchKeys(ctx, requests); err == nil {
// We successfully got some keys. Add them to the results and
// remove them from the request list.
for req, res := range dbResults {
if now > res.ValidUntilTS && res.ExpiredTS == gomatrixserverlib.PublicKeyNotExpired {
continue
}
results[req] = res
delete(requests, req)
}
}
// For any key requests that we still have outstanding, next try to
// fetch them directly. We'll go through each of the key fetchers to
// ask for the remaining keys.
for _, fetcher := range s.OurKeyRing.KeyFetchers {
if len(requests) == 0 {
break
}
if fetcherResults, err := fetcher.FetchKeys(ctx, requests); err == nil {
// We successfully got some keys. Add them to the results and
// remove them from the request list.
for req, res := range fetcherResults {
results[req] = res
delete(requests, req)
}
if err = s.OurKeyRing.KeyDatabase.StoreKeys(ctx, fetcherResults); err != nil {
return nil, fmt.Errorf("server key API failed to store retrieved keys: %w", err)
}
}
}
// If we failed to fetch any keys then we should report an error.
if len(requests) > 0 {
return results, fmt.Errorf("server key API failed to fetch %d keys", len(requests))
}
// Return the keys.
return results, nil
}
func (s *ServerKeyAPI) FetcherName() string {
return fmt.Sprintf("ServerKeyAPI (wrapping %q)", s.OurKeyRing.KeyDatabase.FetcherName())
}