Root cause of folder uploads "freezing at ~95%": the global Content-Security-
Policy `script-src` was `'self'` + inline-script hashes with NO
`'wasm-unsafe-eval'`. Chromium therefore blocked `WebAssembly.instantiate`
("Wasm code generation disallowed by embedder"), so the vendored BLAKE3/FastCDC
WASM threw on instantiation — both on the main thread (instant by-hash uploads
and the batch dedup check) and inside the delta-upload worker. Every file then
fell back to a plain byte upload, and the backend logs showed 0 check-batch /
0 negotiate calls. Large files (32 MB service logs) compounded it and the
session token expired mid-upload, so the last handful failed.
- web/mod.rs: add `'wasm-unsafe-eval'` to `script-src`. WASM-only, safe variant
— does NOT enable `eval()`/`new Function()`. Restores instant uploads, delta
(sub-file dedup), and the client hashing the idempotent re-upload relies on.
- deltaUpload.ts: liveness watchdog on the delta worker. A healthy worker posts
progress sub-second; if it goes silent for 20 s it is wedged (WASM init or
chunking hung without throwing) — disable delta for this file AND every later
one so they fall straight through to a plain upload instead of each burning
the full 120 s+ delta timeout. Defense-in-depth so a broken WASM path can
never again freeze an upload for minutes.
cargo test: pass. npm run check: clean, 58 tests.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
DioCrafts
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