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feat: serve pdf.js from this origin instead of a CDN
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Browse Source 
The Site pulled pdf.js 3.11.174 from cdnjs with no integrity attribute, and the
policy trusted the whole of cdnjs.cloudflare.com for both script-src and
worker-src. Anything that host served would have executed, and a customer
measuring a PDF sheet depended on it being reachable.

Vendor both files instead of pinning a hash: it removes the dependency rather
than constraining it, and lets the policy name only 'self'. Provenance and
SHA-256 digests are recorded in local/static/vendor/README.md, verified on
download against the SRI digests cdnjs publishes for that release.

cdnjs is now absent from script-src, worker-src and connect-src in both gateway
templates. Workers are 'self' plus blob:, which the Site needs for the worker it
constructs itself.

Verified in a browser against the running stack: pdf.js loads from /vendor/, the
blob worker starts, and a real seven-page PDF parses with no CSP violation. Both
browser suites and the full integration suite pass.

The version is deliberately unchanged. 3.11.174 is old, but its known eval path
is already closed by isEvalSupported:false, and upgrading is an API change that
needs its own testing rather than riding along with this.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Cauê Faleiros
2026-09-21 13:56:02 -03:00
parent 9926d3ab55
commit da903db32a
7 changed files with 103 additions and 7 deletions
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local/static/vendor/README.md vendored Normal file
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# Vendored third-party assets
Served from this repository rather than a CDN, so the Site does not depend on a
third party being reachable and honest at the moment a customer opens it, and so
the Content-Security-Policy can name only `'self'` for scripts and workers.
## pdf.js 3.11.174
Used by the by-metre flow to measure and rasterise a PDF sheet in the browser.
| File | SHA-256 |
|---|---|
| `pdf.min.js` | `5b5799e6f8c680663207ac5b42ee14eed2a406fa7af48f50c154f0c0b1566946` |
| `pdf.worker.min.js` | `feabdf309770ed24bba31a5467836cdc8cf639c705af27d52b585b041bb8527b` |
Downloaded from `https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/` and
verified against the SRI digests cdnjs publishes for that release:
```
pdf.min.js sha512-q+4liFwdPC/bNdhUpZx6aXDx/h77yEQtn4I1slHydcbZK34nLaR3cAeYSJshoxIOq3mjEf7xJE8YWIUHMn+oCQ==
pdf.worker.min.js sha512-BbrZ76UNZq5BhH7LL7pn9A4TKQpQeNCHOo65/akfelcIBbcVvYWOFQKPXIrykE3qZxYjmDX573oa4Ywsc7rpTw==
```
To verify or refresh, compare against that API before replacing anything:
```bash
curl -s "https://api.cdnjs.com/libraries/pdf.js/<version>?fields=sri"
```
**Version note.** 3.11.174 is old. It is affected by GHSA-wgrm-67xf-hhpq, whose
documented workaround is `isEvalSupported: false`; `dtf-site.html` already passes
that, so the known path is closed. Upgrading is worthwhile but is an API change,
not a file swap, and belongs with its own browser testing — see `ROADMAP.md` 2.7.