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* Bound public rate-limit buckets against attacker-keyed growth. Keep the NIP-13 PoW sender bypass, skip content-bucket minting on sender reject, and evict idle/oldest entries at a hard cap. Co-authored-by: Cursor <cursoragent@cursor.com> * Stop Cashu-looking text from skipping long-message guards. Oversized public content always collapses and takes the plain formatting path so remote tokens cannot force layout/regex DoS. Co-authored-by: Cursor <cursoragent@cursor.com> * Cap teleported geohash participant markers. Bound the set with FIFO eviction, clear it on channel switch, and prune markers that leave the visible participant list. Co-authored-by: Cursor <cursoragent@cursor.com> * Bound untrusted Nostr relay frames and event tags. Reject oversized inbound messages before JSON parse, cap tag arrays/values at decode, and stop logging raw tag contents. Co-authored-by: Cursor <cursoragent@cursor.com> * Fail soft when Noise handshake state is unexpectedly missing. Replace the initiator startHandshake force unwrap with a guard that throws invalidState instead of crashing. Co-authored-by: Cursor <cursoragent@cursor.com> * Cap geohash nickname cache from remote Nostr events. FIFO-evict at capacity, clear on channel switch, and prune nicknames that leave the visible participant list. Co-authored-by: Cursor <cursoragent@cursor.com> * Avoid overlapping exclusive access in the rate limiter. Make bucket helpers static so inout dictionary updates do not conflict with a mutating call on self. Co-authored-by: Cursor <cursoragent@cursor.com> * Fix rate-limiter tests for mutating allow under #expect. Call allow outside the macro so Swift Testing does not capture an immutable copy of the struct. Co-authored-by: Cursor <cursoragent@cursor.com> * Drop unused WebSocket data helper; reset rate limiter on panic wipe. dataWithinInboundLimit replaced the unbounded path, and panic clear should not leave public intake buckets behind. Co-authored-by: Cursor <cursoragent@cursor.com> --------- Co-authored-by: Cursor <cursoragent@cursor.com>
Test Harness Guide
This test suite uses an in-memory networking harness to make end-to-end and integration tests deterministic, fast, and race-free without touching production code.
In-Memory Bus
- File:
bitchatTests/Mocks/MockBLEService.swift - Registry/Adjacency: Global
registrymapspeerIDto aMockBLEServiceinstance;adjacencyrecords simulated links between peers. - Setup: Call
MockBLEService.resetTestBus()insetUp()to clear state between tests. - Topology: Use
simulateConnectedPeer(_:)andsimulateDisconnectedPeer(_:)to add/remove links.connectFullMesh()helpers in tests build larger topologies. - Handlers: Tests can observe data via
messageDeliveryHandler(decodedBitchatMessage) andpacketDeliveryHandler(rawBitchatPacket). - De‑duplication: A thread-safe
seenMessageIDsprevents duplicate deliveries during flooding/relays.
Broadcast Flooding
- Flag:
MockBLEService.autoFloodEnabled - Intent: When
true, public broadcasts propagate across the entire connected component (ignores TTL for reach) while still de‑duping to prevent loops. - Usage: Enabled in Integration tests (
setUp) to simulate large-network broadcast; disabled in E2E tests to keep routing explicit and verify TTL behavior (seePublicChatE2ETests.testZeroTTLNotRelayed).
Rehandshake Flow (Noise)
- Why: The legacy NACK recovery path was removed; recovery now relies on Noise session rehandshake after decrypt failure or desync.
- Manager:
NoiseSessionManagermanages per-peer sessions. - Pattern: On decrypt failure, proactively clear the local session and re-initiate a handshake. The peer accepts and replaces their session.
- Test:
IntegrationTests.testRehandshakeAfterDecryptionFailure- Corrupts ciphertext to induce a decrypt error.
- Calls
removeSession(for:)on the initiator’s manager beforeinitiateHandshake(with:)to avoidalreadyEstablished. - Verifies encrypt/decrypt succeeds post-rehandshake.
Tips
- Determinism: Add small async delays only where handler installation/topology changes could race the first send.
- Scoping: Keep
autoFloodEnabledtoggled only within Integration tests; always reset intearDown()to avoid cross-test contamination. - Direct vs Relay: Private messages target a specific peer when adjacent; otherwise they are surfaced to neighbors for relay and, if known, also delivered to the target.
Quick Start
- Create nodes and connect them:
let svc = MockBLEService(); svc.myPeerID = "PEER1"svc.simulateConnectedPeer("PEER2")
- Observe messages:
svc.messageDeliveryHandler = { msg in /* asserts */ }
- Enable broadcast flooding for Integration suites only:
MockBLEService.autoFloodEnabled = true