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Go
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import ( "context" "fmt" "log/slog"
comatproto "github.com/bluesky-social/indigo/api/atproto" "github.com/bluesky-social/indigo/atproto/identity" "github.com/bluesky-social/indigo/atproto/syntax" indigoxrpc "github.com/bluesky-social/indigo/xrpc" "tangled.org/core/api/tangled" "tangled.org/core/knotserver/db" "tangled.org/core/log")
const ( publicKeyPageSize = 100 maxPublicKeyPages = 20)
func FetchAndStore(ctx context.Context, dir identity.Directory, store *db.DB, did syntax.DID) error { l := log.FromContext(ctx)
id, err := dir.LookupDID(ctx, did) if err != nil { return fmt.Errorf("lookup did to fetch keys: %w", err) }
serviceEndpoint, ok := id.Services["atproto_pds"] if !ok { l.Warn("did identity did not contain atproto_pds service while adding their keys", "did", did) return nil }
xrpcc := indigoxrpc.Client{Host: serviceEndpoint.URL} records, err := listAllPublicKeys(ctx, l, &xrpcc, did, "", maxPublicKeyPages) if err != nil { return fmt.Errorf("fetching public keys for did: %w", err) }
keys := collectPublicKeys(l, did, records) if len(keys) == 0 { l.Warn("no public keys fetched, skipping replace so existing keys are not wiped by a transient empty response", "did", did) return nil }
if err := store.ReplacePublicKeys(did, keys); err != nil { return fmt.Errorf("replacing public keys in db: %w", err) } return nil}
func listAllPublicKeys(ctx context.Context, l *slog.Logger, xrpcc *indigoxrpc.Client, did syntax.DID, cursor string, pagesLeft int) ([]*comatproto.RepoListRecords_Record, error) { if pagesLeft <= 0 { l.Warn("public key pagination hit page cap, remaining keys ignored", "did", did, "cap", maxPublicKeyPages) return nil, nil }
resp, err := comatproto.RepoListRecords(ctx, xrpcc, tangled.PublicKeyNSID, cursor, publicKeyPageSize, did.String(), false) if err != nil { return nil, err }
if resp.Cursor == nil || *resp.Cursor == "" || len(resp.Records) == 0 { return resp.Records, nil }
rest, err := listAllPublicKeys(ctx, l, xrpcc, did, *resp.Cursor, pagesLeft-1) if err != nil { return nil, err }
return append(resp.Records, rest...), nil}
func collectPublicKeys(l *slog.Logger, did syntax.DID, records []*comatproto.RepoListRecords_Record) []db.PublicKey { return collectPublicKeysInto(l, did, records, nil)}
func collectPublicKeysInto(l *slog.Logger, did syntax.DID, records []*comatproto.RepoListRecords_Record, acc []db.PublicKey) []db.PublicKey { if len(records) == 0 { return acc }
return collectPublicKeysInto(l, did, records[1:], appendValidKey(l, did, acc, records[0]))}
func appendValidKey(l *slog.Logger, did syntax.DID, acc []db.PublicKey, record *comatproto.RepoListRecords_Record) []db.PublicKey { if record == nil { return acc }
key, ok := record.Value.Val.(*tangled.PublicKey) if !ok || key == nil { return acc }
rkey, err := recordKeyFromURI(record.Uri) if err != nil { l.Warn("skipping public key with unparseable uri", "uri", record.Uri, "err", err) return acc }
return append(acc, db.PublicKey{ Did: did, Rkey: rkey, PublicKey: *key, })}
func recordKeyFromURI(uri string) (syntax.RecordKey, error) { aturi, err := syntax.ParseATURI(uri) if err != nil { return "", err } return aturi.RecordKey(), nil}