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feat: Sprint 5 — encrypted file transfer with chunked upload/download

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- Add uploadBlob (@21) and downloadBlob (@22) RPCs to Cap'n Proto
  schema with SHA-256 content addressing and chunked transfer
- Server blob handler: 256KB chunks, SHA-256 verification on finalize,
  .meta JSON sidecar, 50MB size limit, content-addressable storage
- Add FileRef (0x08) AppMessage variant with blob_id, filename,
  file_size, mime_type
- /send-file command: read file, compute hash, upload in chunks with
  progress display, send FileRef via MLS, MIME auto-detection
- /download command: fetch blob in chunks with progress, verify hash,
  save to disk with collision avoidance
- 2 new E2E tests: upload/download round-trip with partial reads,
  hash mismatch rejection (14 E2E tests total)
- New error codes: E024-E027 for blob operations
This commit is contained in:
Christian Nennemann
2026-03-04 00:27:18 +01:00
parent 81d5e2e590
commit 3350d765e5
12 changed files with 1086 additions and 8 deletions
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@@ -5605,6 +5605,7 @@ dependencies = [
"rusqlite",
"rustls",
"serde",
"serde_json",
"sha2 0.10.9",
"subtle",
"tempfile",