87 lines
3.1 KiB
Go
87 lines
3.1 KiB
Go
// Copyright 2020 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build wasm
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package main
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import (
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"context"
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"fmt"
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"time"
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"github.com/libp2p/go-libp2p-core/peer"
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"github.com/matrix-org/gomatrixserverlib"
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)
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const libp2pMatrixKeyID = "ed25519:libp2p-dendrite"
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type libp2pKeyFetcher struct {
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}
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// FetchKeys looks up a batch of public keys.
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// Takes a map from (server name, key ID) pairs to timestamp.
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// The timestamp is when the keys need to be vaild up to.
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// Returns a map from (server name, key ID) pairs to server key objects for
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// that server name containing that key ID
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// The result may have fewer (server name, key ID) pairs than were in the request.
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// The result may have more (server name, key ID) pairs than were in the request.
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// Returns an error if there was a problem fetching the keys.
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func (f *libp2pKeyFetcher) FetchKeys(
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ctx context.Context,
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requests map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.Timestamp,
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) (map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult, error) {
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res := make(map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult)
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for req := range requests {
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if req.KeyID != libp2pMatrixKeyID {
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return nil, fmt.Errorf("FetchKeys: cannot fetch key with ID %s, should be %s", req.KeyID, libp2pMatrixKeyID)
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}
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// The server name is a libp2p peer ID
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peerIDStr := string(req.ServerName)
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peerID, err := peer.Decode(peerIDStr)
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if err != nil {
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return nil, fmt.Errorf("Failed to decode peer ID from server name '%s': %w", peerIDStr, err)
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}
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pubKey, err := peerID.ExtractPublicKey()
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if err != nil {
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return nil, fmt.Errorf("Failed to extract public key from peer ID: %w", err)
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}
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pubKeyBytes, err := pubKey.Raw()
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if err != nil {
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return nil, fmt.Errorf("Failed to extract raw bytes from public key: %w", err)
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}
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b64Key := gomatrixserverlib.Base64String(pubKeyBytes)
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res[req] = gomatrixserverlib.PublicKeyLookupResult{
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VerifyKey: gomatrixserverlib.VerifyKey{
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Key: b64Key,
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},
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ExpiredTS: gomatrixserverlib.PublicKeyNotExpired,
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ValidUntilTS: gomatrixserverlib.AsTimestamp(time.Now().Add(24 * time.Hour * 365)),
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}
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}
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return res, nil
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}
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// FetcherName returns the name of this fetcher, which can then be used for
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// logging errors etc.
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func (f *libp2pKeyFetcher) FetcherName() string {
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return "libp2pKeyFetcher"
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}
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// no-op function for storing keys - we don't do any work to fetch them so don't bother storing.
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func (f *libp2pKeyFetcher) StoreKeys(ctx context.Context, results map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult) error {
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return nil
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}
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