From 77dd077491aea50e71e21e0d17555a2f91cf818b Mon Sep 17 00:00:00 2001 From: Christophe Besson Date: Mon, 7 Sep 2026 17:45:54 +0200 Subject: refactor(mnp)!: remove stream_seg, the last unencrypted content message MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit `stream_seg` answered with an MPEG-TS segment as base64 with no encryption at all — the one message on the content plane that never went through a GEK-derived key. Live on both transports, answering any authenticated member. It predates `stream_data`, which does the same job properly (`chunk_ciphertext`, keyed per segment, AES-256-GCM) and has since Phase 12. Its only browser caller, `fetchStreamSegment`, was defined and never once invoked — a plaintext media endpoint with no client. Removed rather than repaired. Gone with it: `_extract_segment` and the ffmpeg semaphore in quic_server, the `fetch_stream_segment` QUIC client method, and `_b64decode` in transport.js, which had no other caller. The H6 regression test lived on this handler — it pinned `_do_stream_segment_async` to a coroutine so `subprocess.run` could not stall the event loop for thirty seconds per request. It is replaced by the property that outlives the handler: no transport carries media outside an AEAD, asserted on `stream_seg` and `data_b64` across all three transport modules. The half of H6 that survives — the live streaming path still spawns ffmpeg — keeps its own test. BREAKING CHANGE: `stream_seg` is no longer answered on either transport. No shipping client sends it. Recorded as part of MNP 2.0, whose other half — the sealed upload — carries the version bump. Co-Authored-By: Claude Opus 5 Claude-Session: https://claude.ai/code/session_01AsoWC3GmhNdwVFomW3QjH3 --- packages/meshbay-common/src/meshbay_common/protocol.py | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'packages/meshbay-common/src') diff --git a/packages/meshbay-common/src/meshbay_common/protocol.py b/packages/meshbay-common/src/meshbay_common/protocol.py index 6eff5b6..bb52a51 100644 --- a/packages/meshbay-common/src/meshbay_common/protocol.py +++ b/packages/meshbay-common/src/meshbay_common/protocol.py @@ -59,7 +59,13 @@ class MNP: INDEX_PROGRESS = "index_progress" FILE_REQUEST = "file_req" # request chunk(s) FILE_CHUNK = "file_chunk" # encrypted chunk response - STREAM_SEGMENT = "stream_seg" # HLS/DASH segment + # STREAM_SEGMENT ("stream_seg") was removed in MNP 2.0. It served an + # MPEG-TS segment as base64 **with no encryption at all** — the one message + # on the content plane that never was under a GEK-derived key. It predates + # STREAM_DATA, which does the same job properly (`chunk_ciphertext`, keyed + # per segment), and its browser caller `fetchStreamSegment` was defined and + # never once invoked. A live handler on both transports, plaintext media, + # and no client: removed rather than repaired. CHAT_MESSAGE = "chat_msg" # Double Ratchet message CHAT_ATTACHMENT = "chat_attach" # attachment metadata CHAT_HISTORY = "chat_hist" # request message history (newest, or before a cursor) -- cgit v1.2.3