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71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
package perform
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import (
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"context"
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"fmt"
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"github.com/matrix-org/gomatrixserverlib"
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)
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// This file contains helpers for the PerformJoin function.
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type joinContext struct {
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federation *gomatrixserverlib.FederationClient
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keyRing *gomatrixserverlib.KeyRing
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}
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// Returns a new join context.
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func JoinContext(f *gomatrixserverlib.FederationClient, k *gomatrixserverlib.KeyRing) *joinContext {
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return &joinContext{
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federation: f,
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keyRing: k,
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}
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}
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// checkSendJoinResponse checks that all of the signatures are correct
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// and that the join is allowed by the supplied state.
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func (r joinContext) CheckSendJoinResponse(
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ctx context.Context,
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event gomatrixserverlib.Event,
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server gomatrixserverlib.ServerName,
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respMakeJoin gomatrixserverlib.RespMakeJoin,
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respSendJoin gomatrixserverlib.RespSendJoin,
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) error {
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// A list of events that we have retried, if they were not included in
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// the auth events supplied in the send_join.
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retries := map[string]bool{}
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retryCheck:
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// TODO: Can we expand Check here to return a list of missing auth
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// events rather than failing one at a time?
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if err := respSendJoin.Check(ctx, r.keyRing, event); err != nil {
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switch e := err.(type) {
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case gomatrixserverlib.MissingAuthEventError:
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// Check that we haven't already retried for this event, prevents
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// us from ending up in endless loops
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if !retries[e.AuthEventID] {
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// Ask the server that we're talking to right now for the event
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tx, txerr := r.federation.GetEvent(ctx, server, e.AuthEventID)
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if txerr != nil {
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return fmt.Errorf("r.federation.GetEvent: %w", txerr)
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}
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// For each event returned, add it to the auth events.
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for _, pdu := range tx.PDUs {
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ev, everr := gomatrixserverlib.NewEventFromUntrustedJSON(pdu, respMakeJoin.RoomVersion)
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if everr != nil {
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return fmt.Errorf("gomatrixserverlib.NewEventFromUntrustedJSON: %w", everr)
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}
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respSendJoin.AuthEvents = append(respSendJoin.AuthEvents, ev)
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}
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// Mark the event as retried and then give the check another go.
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retries[e.AuthEventID] = true
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goto retryCheck
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}
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return fmt.Errorf("respSendJoin (after retries): %w", e)
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default:
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return fmt.Errorf("respSendJoin: %w", err)
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}
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}
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return nil
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}
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