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Complete browser-based client: Preact SPA with login, group file browser,
encrypted download, video playback, group chat, i18n, and dark/light theme.
Browser connects P2P to nodes behind residential NAT via WebRTC DataChannel
(aiortc). Hub handles signaling only — all data flows E2E.
Performance: pipelined downloads (8-chunk sliding window), binary msgpack
wire format (no base64), redundant I/O elimination. Large file downloads
stream to disk via File System Access API (showSaveFilePicker).
Validated on SFR + Orange residential NATs, Chrome + Firefox, IPv4/IPv6.
132 tests passing. Deployed to meshbay.org + Orange node.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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6.1 Double Ratchet (meshbay_common/ratchet.py):
Forward secrecy, break-in recovery, out-of-order delivery.
Signal-spec KDF_RK/KDF_CK via HKDF-SHA256. 11/11 tests.
6.2 Multi-group node (config.py):
[[groups]] TOML array, per-group ports, back-compat [group].
6.3 MHP federation persistence (db/models.py FederatedGroup + SwarmSource):
receive_directory() now persists to federated_groups table.
list_public_groups() includes federated results with source attribution.
6.4 Content replication (node/replication.py + hub SwarmSource):
ContentReplicator: fetch-index, download, hash-verify, register-swarm.
Hub: POST /v1/swarm/register, GET /v1/swarm/{hash} for multi-source.
6.5 Browser private group (webcrypto.py + static/crypto.js):
AES-256-GCM variant of GEK for WebCrypto-compatible groups.
crypto.js: SubtleCrypto importGEK + deriveChunkKey + decryptChunk.
Keys distinct from ChaCha20 via :aes HKDF info suffix. 4/4 tests.
74/74 tests total.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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