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import ( "context" "encoding/json" "strings" "sync" "time"
"github.com/bluesky-social/indigo/xrpc" "stream.place/streamplace/pkg/appbsky" "stream.place/streamplace/pkg/aqtime" "stream.place/streamplace/pkg/constants" "stream.place/streamplace/pkg/log" "stream.place/streamplace/pkg/model" "stream.place/streamplace/pkg/placestream")
// Chat access on this node is decided per streamer by their// place.stream.chat.access records: allow and deny rules whose subjects name// a verifier (accounts holding one of its app.bsky.graph.verification// records) or a labeler and label. Nothing is configured on the node: the// verifiers and labelers to index are whatever the indexed rules name, and a// rule naming a new one starts its indexing right away. A verification from// a verifier the streamer allows is what puts the badge on a chat author,// on that streamer's stream.
const rulesCacheTTL = 15 * time.Second
var ( verifierMu sync.Mutex rulesCache = map[string]cachedRules{} subjectsAt time.Time verifiersCached []string labelersCached map[string][]string seedVerifierNow = make(chan string, 64) seededVerifierMu sync.Mutex seededVerifiers = map[string]bool{})
type cachedRules struct { rules []model.ChatAccessRule at time.Time}
// rulesFor returns the streamer's rules, cached briefly. An error is a// lookup failure, which callers must not read as "no rules".func (atsync *ATProtoSynchronizer) rulesFor(ctx context.Context, streamer string) ([]model.ChatAccessRule, error) { if streamer == "" || atsync.Model == nil { return nil, nil } verifierMu.Lock() if c, ok := rulesCache[streamer]; ok && time.Since(c.at) < rulesCacheTTL { verifierMu.Unlock() return c.rules, nil } verifierMu.Unlock() rules, err := atsync.Model.ListChatAccessRules(ctx, streamer) if err != nil { log.Error(ctx, "failed to list chat access rules", "streamer", streamer, "err", err) return nil, err } verifierMu.Lock() rulesCache[streamer] = cachedRules{rules: rules, at: time.Now()} verifierMu.Unlock() return rules, nil}
func (atsync *ATProtoSynchronizer) refreshSubjects(ctx context.Context) { verifierMu.Lock() fresh := time.Since(subjectsAt) < 2*rulesCacheTTL verifierMu.Unlock() if fresh || atsync.Model == nil { return } verifiers, labelers, err := atsync.Model.ChatAccessSubjects(ctx) if err != nil { log.Error(ctx, "failed to list chat access subjects", "err", err) return } verifierMu.Lock() verifiersCached, labelersCached, subjectsAt = verifiers, labelers, time.Now() verifierMu.Unlock()}
// Verifiers returns every verifier DID some streamer's rule names: the// repos whose app.bsky.graph.verification records this node indexes.func (atsync *ATProtoSynchronizer) Verifiers(ctx context.Context) []string { atsync.refreshSubjects(ctx) verifierMu.Lock() defer verifierMu.Unlock() return verifiersCached}
// Labelers returns, per labeler DID some streamer's rule names, the label// values (exact, or prefix with a trailing *) that this node mirrors.func (atsync *ATProtoSynchronizer) Labelers(ctx context.Context) map[string][]string { atsync.refreshSubjects(ctx) verifierMu.Lock() defer verifierMu.Unlock() return labelersCached}
// NoteChatAccessRule is called when a rule is indexed or deleted: the caches// drop, and a verifier this node has not seeded yet is seeded now rather// than at the next hourly pass.func (atsync *ATProtoSynchronizer) NoteChatAccessRule(ctx context.Context, rule *model.ChatAccessRule) { verifierMu.Lock() delete(rulesCache, rule.RepoDID) subjectsAt = time.Time{} verifierMu.Unlock() if rule.SubjectType == model.ChatAccessSubjectVerifier { seededVerifierMu.Lock() seen := seededVerifiers[rule.SubjectDID] seededVerifierMu.Unlock() if !seen { select { case seedVerifierNow <- rule.SubjectDID: default: } } }}
// labelValueOf returns the label value a mirrored label row stands for// (its URI is label://<labeler>/<subject>/<value>), or "" for a real// verification record.func labelValueOf(v model.Verification) string { if !strings.HasPrefix(v.URI, "label://") { return "" } return v.URI[strings.LastIndex(v.URI, "/")+1:]}
// ruleMatches reports whether one of the subject's verifications satisfies// the rule's subject.func ruleMatches(rule model.ChatAccessRule, verifications []model.Verification) bool { for _, v := range verifications { if v.IssuerDID != rule.SubjectDID { continue } switch rule.SubjectType { case model.ChatAccessSubjectVerifier: if labelValueOf(v) == "" { return true } case model.ChatAccessSubjectLabel: if val := labelValueOf(v); val != "" && labelMatches(val, []string{rule.LabelValue}) { return true } } } return false}
func issuersOf(rules []model.ChatAccessRule) []string { seen := map[string]bool{} var out []string for _, r := range rules { if !seen[r.SubjectDID] { seen[r.SubjectDID] = true out = append(out, r.SubjectDID) } } return out}
// verificationsUnder returns did's verifications by the issuers the rules// name, or nil.func (atsync *ATProtoSynchronizer) verificationsUnder(ctx context.Context, rules []model.ChatAccessRule, did string) []model.Verification { issuers := issuersOf(rules) if len(issuers) == 0 || did == "" { return nil } found, err := atsync.Model.VerificationsFor(ctx, []string{did}, issuers) if err != nil { log.Error(ctx, "failed to look up verifications", "did", did, "err", err) return nil } return atsync.currentVerifications(ctx, did, found[did])}
// currentVerifications drops the app.bsky.graph.verification records that// no longer describe the account: the record vouches for a handle and a// display name, and either changing invalidates it (that is the record's// contract, and what the app view does). Mirrored labels carry neither and// pass through.func (atsync *ATProtoSynchronizer) currentVerifications(ctx context.Context, did string, vs []model.Verification) []model.Verification { var out []model.Verification var handle, displayName string looked := false for _, v := range vs { if labelValueOf(v) != "" || (v.Handle == "" && v.DisplayName == "") { out = append(out, v) continue } if !looked { looked = true handle = atsync.ResolveAuthorHandle(ctx, did) if atsync.Model != nil { if p, err := atsync.Model.GetBskyProfile(ctx, did, false); err == nil && p != nil && p.DisplayName != nil { displayName = *p.DisplayName } } } if v.Handle != "" && handle != "" && !strings.EqualFold(v.Handle, handle) { continue } if v.DisplayName != "" && displayName != "" && v.DisplayName != displayName { continue } out = append(out, v) } return out}
// ChatAllowed reports whether did may chat on streamer's stream under the// streamer's rules: with no rules everyone may; a matching deny rule always// refuses; when any allow rule exists, only a match on one of them admits.func (atsync *ATProtoSynchronizer) ChatAllowed(ctx context.Context, streamer, did string) bool { rules, err := atsync.rulesFor(ctx, streamer) if err != nil { // Fail closed: a database hiccup must not open a locked chat. return false } if len(rules) == 0 { return true } vs := atsync.verificationsUnder(ctx, rules, did) hasAllow := false allowed := false for _, r := range rules { match := ruleMatches(r, vs) switch r.Action { case model.ChatAccessDeny: if match { return false } case model.ChatAccessAllow: hasAllow = true if match { allowed = true } } } return !hasAllow || allowed}
// VerificationState is did's verification, on streamer's stream, by the// verifiers and labelers the streamer's allow rules name, in the shape the// app view uses (so the app renders the same badge either way); nil when// there is none.func (atsync *ATProtoSynchronizer) VerificationState(ctx context.Context, streamer, did string) *appbsky.ActorDefs_VerificationState { var allows []model.ChatAccessRule rules, err := atsync.rulesFor(ctx, streamer) if err != nil { return nil } for _, r := range rules { if r.Action == model.ChatAccessAllow { allows = append(allows, r) } } if len(allows) == 0 { return nil } vs := atsync.verificationsUnder(ctx, allows, did) var state *appbsky.ActorDefs_VerificationState seen := map[string]bool{} for _, r := range allows { for _, v := range vs { if seen[v.URI] || !ruleMatches(r, []model.Verification{v}) { continue } seen[v.URI] = true if state == nil { state = &appbsky.ActorDefs_VerificationState{ VerifiedStatus: "valid", TrustedVerifierStatus: "none", } } state.Verifications = append(state.Verifications, appbsky.ActorDefs_VerificationView{ CreatedAt: aqtime.FromTime(v.CreatedAt).String(), IsValid: true, Issuer: v.IssuerDID, Uri: v.URI, }) } } return state}
// DecorateVerification fills the author's verification state on a chat// message view for streamer's stream.func (atsync *ATProtoSynchronizer) DecorateVerification(ctx context.Context, streamer string, message *placestream.ChatDefs_MessageView) { if message == nil { return } if state := atsync.VerificationState(ctx, streamer, message.Author.Did); state != nil { message.Author.Verification = state }}
// SeedVerificationsForever pulls every verification record from each named// verifier's repo: at boot, hourly after, and as soon as a rule names a// verifier this node has not seeded. The firehose keeps the table current// in between; the seeding covers records issued before this node existed// (or while it was down).func (atsync *ATProtoSynchronizer) SeedVerificationsForever(ctx context.Context) { seed := func(did string) { if err := atsync.seedVerifier(ctx, did); err != nil { log.Warn(ctx, "failed to seed verifications", "verifier", did, "err", err) return } seededVerifierMu.Lock() seededVerifiers[did] = true seededVerifierMu.Unlock() } for { for _, did := range atsync.Verifiers(ctx) { seed(did) } select { case <-ctx.Done(): return case did := <-seedVerifierNow: seed(did) case <-time.After(time.Hour): } }}
type listRecordsOut struct { Cursor string `json:"cursor"` Records []struct { Uri string `json:"uri"` Cid string `json:"cid"` Value json.RawMessage `json:"value"` } `json:"records"`}
func (atsync *ATProtoSynchronizer) seedVerifier(ctx context.Context, did string) error { ident, err := atsync.resolveIdent(ctx, did, true) if err != nil { return err } xrpcc := xrpc.Client{Host: ident.PDSEndpoint(), Client: SyncHTTPClient} if xrpcc.Host == "" { return nil } cursor := "" total := 0 for { params := map[string]any{ "repo": did, "collection": constants.APP_BSKY_GRAPH_VERIFICATION, "limit": 100, } if cursor != "" { params["cursor"] = cursor } var out listRecordsOut if err := xrpcc.Do(ctx, xrpc.Query, "", "com.atproto.repo.listRecords", params, nil, &out); err != nil { return err } for _, r := range out.Records { var rec appbsky.GraphVerification if err := json.Unmarshal(r.Value, &rec); err != nil || rec.Subject == "" { continue } v := &model.Verification{ URI: r.Uri, CID: r.Cid, IssuerDID: did, SubjectDID: rec.Subject, Handle: rec.Handle, DisplayName: rec.DisplayName, } if created, err := aqtime.FromString(rec.CreatedAt); err == nil { v.CreatedAt = created.Time() } if err := atsync.Model.CreateVerification(ctx, v); err != nil && err != model.ErrAlreadyIndexed { log.Warn(ctx, "failed to index seeded verification", "uri", r.Uri, "err", err) continue } total++ } if out.Cursor == "" || len(out.Records) == 0 { break } cursor = out.Cursor } log.Log(ctx, "seeded verifications", "verifier", did, "records", total) return nil}