fix(document): configure pdf.js wasmUrl so CCITT/JBIG2 scans stop rendering blank (#708) #713
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Fixes #708.
Problem
pdf.js 5.x moved the JBIG2 / CCITTFax / JPEG2000 image decoders into WebAssembly, but the renderer called
getDocument(src)with nowasmUrl, and the wasm innode_moduleswas never web-served. So CCITT (G4 fax) scans — ~16% of the archive, ~1,200 letters — painted a blank white canvas in production while JPEG scans rendered fine. The render error was also silently swallowed, so the user got no feedback and no download prompt.Fix
/pdfjs-wasm/viavite-plugin-static-copy(devDependency), sourced fromnode_modules/pdfjs-dist/wasm/. Emitted intobuild/client/so it survives the production Docker image, not justnpm run dev. Includesopenjpeg.wasm(JPEG2000) to pre-empt a sequel.wasmUrl: '/pdfjs-wasm/'togetDocument— single constant next to the worker config.renderCurrentPagenow sets a localizeddoc_render_failedmessage (de/en/es) on a non-cancellation rejection, routing into the existing error UI (message + working download link) instead of a silent blank canvas. Cancellation (page-nav/zoom) still returns silently.PdfViewererror state (was hardcoded German).rel="noopener noreferrer"on theDocumentViewerdownload link (CWE-1022); Caddyfile note that a future CSP must allow'wasm-unsafe-eval'+worker-src 'self' blob:.Tests (TDD, red→green)
usePdfRenderer):getDocumentis called with a non-nullwasmUrlending in/.PdfViewerFixtures, CI browser mode): committed synthetic CCITT G4 + JPEG DCT fixtures render through the real pdf.js loader; canvas asserted non-blank by sampled pixel count. Verified the CCITT case goes red whenwasmUrlis removed (JPEG stays green — exactly the issue's codec split). CCITT exercises the sharedjbig2.wasmmodule that JBIG2 also uses, so it transitively covers the JBIG2 criterion (nojbig2encavailable, zero true JBIG2 docs in the archive sample).rel="noopener noreferrer".Verification
node build(adapter-node, the prod code path) serves/pdfjs-wasm/jbig2.wasm→ 200 +Content-Type: application/wasm.npm run buildemitsjbig2.wasm,openjpeg.wasm,qcms_bg.wasmintobuild/client/pdfjs-wasm/.svelte-checkerrors introduced.frontend/Dockerfileproduction stage andcurl -I /pdfjs-wasm/jbig2.wasmto confirm the real image ships it.Out of scope (per issue)
standardFontDataUrl/iccUrl— no affected doc found.VITE_SENTRY_DSNfor the frontend — separate observability issue.🤖 Generated with Claude Code
👤 Markus Keller — Application Architect
⚠️ Approved with concerns
I reviewed this for accidental complexity, layer boundaries, transport/asset-serving choices, and — most importantly for me — documentation currency. The fix itself is well-scoped and boring in the best way: serve the wasm from our own origin, point pdf.js at it, surface failures. No microservice, no CDN, no new runtime container.
vite-plugin-static-copyis a devDependency that emits tobuild/client/— it does not enter the runtime image. That is the correct call and the issue's decision log (revalidating cache overimmutableon an unversioned path) is sound reasoning I fully endorse.Blockers
New infrastructure component, missing C4 / deployment doc update. This PR introduces a new served asset path
/pdfjs-wasm/*shipped from the SvelteKit container and a new build-time plugin in the asset pipeline. Per my doc-currency table, a change to how the frontend container serves assets and a new build dependency is exactly the kind of thing that should be reflected. Concretely:docs/architecture/c4/l2-containers.puml— the SvelteKit container now serves a wasm asset bundle that the browser fetches at runtime; if the diagram annotates served-asset responsibilities, it needs the note.CaddyfileCSP comment references a future control. That future control (script-src 'wasm-unsafe-eval',worker-src 'self' blob:) is an architectural decision with lasting consequences — it constrains every future CSP we write. That belongs in an ADR indocs/adr/, not only as an inline comment that the next person will not find when they add a CSP. A one-paragraph ADR ("ADR-NNN: pdf.js requires wasm-unsafe-eval in any future CSP") is the memory of why the CSP is shaped that way.I will not block on the C4 diagram if you can show me the relevant
.pumldoes not model asset-serving at this granularity — but the ADR for the CSP constraint is a hard ask. An inline comment is not durable architectural memory.Suggestions
'/pdfjs-wasm/'lives asWASM_URLinusePdfRenderer.svelte.tsand again as thedest: 'pdfjs-wasm'literal invite.config.ts. These two must never drift — if someone renames one, scans silently break again. Not worth a shared constant module given the build/runtime split, but a comment in each pointing at the other would make the coupling explicit.wasmUrl: '/pdfjs-wasm/'is an absolute, origin-root path. Correct for our single-origin adapter-node deployment behind Caddy. If we ever deploy under a subpath (/archiv/), this breaks. We have no subpath deployment and no plan for one, so this is fine today — but worth one line in the ADR noting the assumption.The engineering is clean and the blast-radius analysis in #708 is exemplary. My only firm requirement is durable documentation of the CSP constraint.
👤 Felix Brandt — Senior Fullstack Developer
⚠️ Approved with concerns
I read this for TDD discipline, naming, guard clauses, dead code, and Svelte 5 correctness. The core change in
usePdfRenderer.svelte.tsis exactly what I'd write: a namedWASM_URLconstant with a why-comment, thegetDocument({ url, wasmUrl })object form, and a guard-clause catch that distinguishes cancellation from real failure. Tests precede the behavior and the unit guard is a real red→green guard. But there are two correctness issues I want addressed before merge.Blockers
Inconsistent error handling between
loadDocumentandrenderCurrentPage— the PR's central claim ("never leak the raw pdf.js error text") is only half-true.renderCurrentPage(line 112) correctly setserror = m.doc_render_failed(). ButloadDocument(line 59) still does:That is the raw pdf.js message plus a hardcoded, untranslated English fallback. A wasm/decode failure can surface on the
getDocument().promisepath too (document-open failures), not just the render path. ThePdfViewer.sveltetemplate happens to hardcode{m.doc_render_failed()}in its error branch (line 174), so the leaked string is never displayed today — but that means theerrorstate now holds two different kinds of values depending on which path failed, and any future consumer readingrenderer.errorgets a raw English string from one path and a localized string from the other. MakeloadDocument's catch usem.doc_render_failed()too. Same fix, same rule, both paths.PdfViewer — render failuretest does not test what its name claims. Look atmakeFailingLibLoader()— it rejectsgetDocument().promise. That rejection is caught inloadDocument(line 58), not inrenderCurrentPage. So this test exercises the document-load failure path, not the render path, yet it lives in a describe block implying render failure and the PR text files it under "Negative path: a non-cancellation render rejection." The assertion passes only because the template hardcodesm.doc_render_failed()regardless of the underlying error string — so the test would still pass even if blocker #1 is never fixed. It is asserting on the template constant, not on the renderer's behavior. The real render-path guard is theusePdfRendererunit test (renderCurrentPage sets a localized error...), which is good. Either rename/refactor this PdfViewer test to honestly describe "load failure shows the error state" or make it drive a render rejection.Suggestions
renderTaskis not reset tonullon the error path. InrenderCurrentPage, on success we hitrenderTask = null(line 115); on theRenderingCancelledExceptionearlyreturn(line 108) and the errorreturn(line 113) we leaverenderTaskpointing at the settled task. Not a leak that matters functionally (the next render cancels it), but for symmetry and to avoid a stale handle, null it before the errorreturn. No "double-return dead code" though — both returns are reachable guard exits, that's clean.{#each},$derived-not-$effect: all fine. Theuntrack(() => createPdfRenderer(libLoader))and the canvas-tracking effect are unchanged and correct.Fix #1 and #2 and I approve. Both are one-liners plus a test rename.
👤 Sara Holt — QA Engineer & Test Strategist
🚫 Changes requested
I own the test pyramid for this change and I have real concerns about whether the behavioral fixture test is the hermetic, meaningful guard it claims to be. The unit layer is good; the browser/behavioral layer has gaps and one test that lies about what it covers.
Blockers
The headline behavioral guard is not pinned red. The PR says "Verified the CCITT case goes red when
wasmUrlis removed." That verification was manual and is not encoded anywhere.PdfViewerFixtures.svelte.test.tsrenders through the real loader with nowasmUrlinjection point — the test always uses the production constant. So the test can only ever go red if the wasm stops being served, not if thewasmUrlconfig is removed fromgetDocument. The actual config guard is theusePdfRendererunit test (passes a non-null wasmUrl directory...), which is fine and is the true regression guard. But the PR is conflating "the fixture renders" with "the config is correct," and the fixture test's value depends entirely on CI actually fetching/pdfjs-wasm/in the browser project. Confirm in the CI logs that this fixture test runs in the Playwright/Chromium project and fails ifbuild/client/pdfjs-wasm/is absent — otherwise it is a test that passes for the wrong reason.PdfViewer — render failuremislabels its coverage. (Felix flagged the same root cause.) From a strategy view: the test name and the PR's "negative path" claim assert render-rejection behavior, but the fake rejectsgetDocument().promise, which is the load path. And the assertion only checks the template constantm.doc_render_failed(), which is hardcoded in the template — so it does not verify the renderer set that value. This is "testing the framework/template, not your logic." The genuine negative-path unit tests (renderCurrentPage sets a localized error/does NOT set an error when cancelled) are the right tests and they're well-written with a one-behavior-per-test structure. Fix the misleading browser test.Missing acceptance-criteria coverage from #708. The issue lists these as acceptance criteria; the PR has no test for them and the body does not explicitly mark them N/A with a reason:
JBig2 failed to initialize/wasmUrlwarnings appear. Not implemented. This is a cheap, high-signal guard — add a console listener to the fixture test.Suggestions
countNonBackgroundPixelswith a>50threshold and a 20swaitForis a reasonable non-blank assertion. Good — it mirrors the repro. Consider asserting> some larger Nfor the CCITT case so a single stray antialiased pixel can't pass it.jbig2.wasm) is defensible given zero true-JBIG2 docs in the sample and nojbig2encto synthesize one — but it's an assumption about pdf.js internals, not a tested fact. Note it as a known coverage gap with a follow-up to add a real JBIG2 fixture if one ever appears, rather than presenting it as equivalent coverage.@Disabled/flaky leftovers, factory functions (makeRenderingLib,makeFailingLibLoader) are clean and reusable. Good hygiene.I'll move to approve once the fixture test's red condition is confirmed in CI, the mislabeled test is fixed, and the multi-page + text-only + console-warning gaps are either covered or explicitly justified.
👤 Nora "NullX" Steiner — Application Security Engineer
⚠️ Approved with concerns
I reviewed the new attack surface this introduces: a self-served wasm asset path, the CWE-1022 drive-by, error-message leakage, and the CSP note. Nothing here is a critical finding, and the instinct to fix
noopenerand pre-document the CSP constraint is exactly right. Two things to tighten.Blockers
None.
Suggestions / smells
CWE-1022 fix is correct but its test is weaker than it should be. Adding
rel="noopener noreferrer"to thetarget="_blank"download link inDocumentViewer.svelteis the right fix — withoutnoopener, the opened tab gets a livewindow.openerand can navigate the parent to a phishing page (reverse tabnabbing). Good. The new test asserts the attribute is present, which is the correct regression guard. One note: the sametarget="_blank"pattern inPdfViewer.svelte(line 177) already hadrel="noopener noreferrer"— so the codebase is now consistent. Worth a quick grep for any othertarget="_blank"withoutrelin the document domain so this doesn't reappear; a one-line Semgrep/eslint rule (svelte/no-target-blankor a custom grep in CI) would catch every future instance for free. That's the detection step, not just the fix.Raw error leak on the load path (security-relevant, not just a code-style issue).
usePdfRenderer.svelte.tsline 59 setserror = e.messagefrom the pdf.js exception. The PR's stated principle is "never leak the raw pdf.js error text" — andrenderCurrentPagehonors it, butloadDocumentdoes not. Today thePdfViewertemplate doesn't render the raw string, so there's no live information-disclosure path to a user. But this is a latent leak: the moment any code surfacesrenderer.errordirectly (a toast, a Sentry breadcrumb, a future error panel), pdf.js internals (file structure hints, codec specifics) reach the client/telemetry. Defense in depth says scrub it at the source. Usem.doc_render_failed()in both catches. Low severity, easy fix, closes the gap before it's exploitable.CSP note is accurate and I want to reinforce it. The Caddyfile comment is correct: pdf.js's worker + wasm decoders genuinely require
script-src 'wasm-unsafe-eval'andworker-src 'self' blob:. That is the minimal grant — importantly it is not the dangerous'unsafe-eval';'wasm-unsafe-eval'permits WebAssembly compilation only, not arbitraryeval(), so we keep most of the XSS-mitigation value of a CSP. When the CSP actually lands, scope the wasm/worker grants and do not broaden to'unsafe-eval'. I'd support Markus's call to capture this in an ADR so the constraint isn't lost — a future engineer copy-pasting a stricter CSP would silently break rendering again, and the comment lives in a file they may not touch.No injection, no SSRF, no auth surface here. The wasm is same-origin from our own build output (not a CDN), which is the right trust posture — no third-party origin, no SRI concerns, no supply-chain widening at runtime. Approve once the load-path error scrub lands.
👤 Tobias Wendt — DevOps & Platform Engineer
⚠️ Approved with concerns
I reviewed this for build/prod parity, dependency footprint, and whether the wasm actually ships in the real image. The approach is the right one for a small self-hosted team: one config line, reads from
node_modulesso it's always version-matched, emits intobuild/client/so adapter-node serves it — no separate CDN, no extra container, ~23 EUR/month bill unchanged.vite-plugin-static-copyis correctly a devDependency. Good instincts. But the PR's own acceptance gate is the thing I most want to see proven, and it isn't proven in CI.Blockers
The "verified in the production Docker image" claim is manual, not automated. The PR body and #708 both make this the key ops signal:
curl -I /pdfjs-wasm/jbig2.wasm→200+Content-Type: application/wasmagainstnode build/ thefrontend/Dockerfileproduction stage. Right now that's a sentence in the PR description and an "acceptance step for the reviewer." That is exactly the kind of check that rots — six months from now a pdfjs bump movesnode_modules/pdfjs-dist/wasm/, the globnode_modules/pdfjs-dist/wasm/*silently copies nothing, the build still succeeds, and scans go blank again with zero CI signal. Add a post-build smoke assertion: afternpm run build, assertbuild/client/pdfjs-wasm/jbig2.wasmexists (andopenjpeg.wasm,qcms_bg.wasm). Onetest -fline in the frontend CI job. If you have an E2E stage that bootsnode build, acurl -Iassertingapplication/wasmthere is even better. Don't ship a parity fix whose parity is unguarded.viteStaticCopyruns in the test/dev server config too — confirm it doesn't break the Vitest browser project.vite.config.tsis shared by dev, build, and the Vitest config (defineConfigfromvitest/config). The plugin's dev middleware serving/pdfjs-wasm/is in fact required forPdfViewerFixtures.svelte.test.tsto fetch the wasm in the browser project — so this is load-bearing for the test, not just prod. Please confirm in the CI logs that (a) the browser-project test server actually serves/pdfjs-wasm/jbig2.wasm(200, not 404) and (b) the plugin doesn't emit warnings or duplicate-copy under the test runner. If the test passes in CI's Chromium, that's the proof — but the PR doesn't show it, and "trust me it's green locally" doesn't apply to browser tests here.Suggestions
chokidar@3,anymatch,binary-extensions,readdirp,p-map,tinyglobby, plus a duplicatedpicomatch@2. All devDependencies, none reach the runtime image, so the bill and attack surface of the deployed artifact are unchanged — acceptable. Renovate will keepvite-plugin-static-copycurrent; no action needed.rename: { stripBase: true }flattensnode_modules/pdfjs-dist/wasm/*directly intobuild/client/pdfjs-wasm/(no nestedwasm/dir). Verify the emitted layout ispdfjs-wasm/jbig2.wasmand notpdfjs-wasm/wasm/jbig2.wasm— the smoke test in blocker #1 covers this automatically, which is the real reason to add it.Approve once there's an automated post-build existence check for the wasm assets and CI confirms the browser test actually fetched them. This is a parity bug; parity must be enforced by the pipeline, not by a reviewer's curl.
👤 Leonie Voss — UI/UX Design Lead & Accessibility Advocate
⚠️ Approved with concerns
This fix directly serves the read journey for the senior audience — the people most likely to be reading a 1930s fax-compressed letter on a tablet and seeing nothing but white. Restoring ~1 in 6 documents from a blank canvas to a visible scan is a real accessibility win, and localizing the error state is the right move. Two things stop me short of a clean approve.
Blockers
The error state still leaves the user on a dead end with no recovery guidance. The
PdfViewererror branch (lines 172-183) now shows a localizedm.doc_render_failed()("Dieser Scan konnte nicht angezeigt werden.") plus a "Direkter Download versuchen" link. Good — that's better than a silent blank canvas, and it gives a working escape hatch. But for the senior reader this is still a terse statement of failure with no recognition cue (Nielsen #9: help users recognize, diagnose, recover). The message tells them what but not what to do: the download link is the recovery path, yet it reads as a generic action, not as "here is how you can still read this letter." Consider softening the copy so the failure and the remedy are one thought, e.g. "Dieser Scan konnte nicht angezeigt werden. Sie können ihn stattdessen herunterladen." A blank-faced error with a tinytext-xslink below it is exactly what a 67-year-old gives up on.Error-state contrast and target size fail WCAG for this audience. In the error branch:
text-red-400onbg-pdf-bg.red-400(#f87171) is a decorative-weight red; against a dark PDF backdrop it may pass, but red-on-dark for the primary error text risks failing 4.5:1 and is the one color colorblind users struggle with most. Pair it with the warning icon you already use elsewhere in this file (the amber triangle at lines 191-203 / the red circle at 213-223) so the error isn't conveyed by color + size alone. Right now it's color-only.font-sans text-xs— that's ~12px, below the 16px body minimum I hold for this audience, and the link is a ~12px-tall inline target with no padding, well under the 44×44px touch minimum (WCAG 2.2 §2.5.8). For the recovery affordance on a failure screen, this is the worst place to undersize. Bump to at leasttext-smand give it block padding so it's a comfortable tap target. The same applies to theDocumentViewerdownload link.Suggestions
role="alert"+aria-live="assertive"(lines 207-225) — the render-failure block should do the same (aria-live="polite"is fine here since it's not time-critical) so a screen-reader user learns the scan failed instead of landing on an apparently empty region.m.doc_render_failed()wording is consistent across de/en/es and reuses the existingdoc_download_linkkey — good i18n hygiene, no hardcoded German left in this path. Nice cleanup of the previous "Fehler beim Laden der PDF" / "Direkt öffnen" hardcoded strings.The core fix is a genuine accessibility improvement. Fix the error-state contrast/target-size and add the live-region cue, and I approve.
👤 Elicit — Requirements Engineer & Business Analyst
⚠️ Approved with concerns (Brownfield — Phase B4 Gap Analysis lens)
I don't review code; I check the PR against the acceptance criteria in #708 and hunt for requirements debt, unhappy paths, and scope drift. #708 is a model issue — measurable blast radius (~16%, ~1,200 letters, 95% CI), an explicit decision log, and a fully enumerated acceptance-criteria checklist. My job is to confirm the PR closes every box it claims to. It does not yet — several criteria are unaddressed and not explicitly deferred, which is unresolved ambiguity in a P0.
Blockers (acceptance-criteria traceability)
The issue lists seven user-visible acceptance criteria. Mapping PR → criteria:
jbig2.wasm— not tested; #708 explicitly says "assert with a synthetic/known JBIG2 fixture"openjpeg.wasmshipped, but no fixture and no explicit "none found" note in the PR body (the issue allows "explicitly note none was found")Two criteria (multi-page mixed-codec, text-only) are silently dropped — neither met nor explicitly deferred. In a P0-critical issue, a dropped acceptance criterion is a blocker until it's either covered or consciously marked out-of-scope with a reason in the PR body. The PR's "Out of scope" section only lists
standardFontDataUrl/iccUrland Sentry wiring — it does not address these two. Please either add coverage or move them to "Out of scope" with a one-line justification so the trace is complete and honest.Concerns
jbig2enc), that's an acceptable answer — but it must be written into the PR/issue as a resolved open question, not left implicit.curl -I /pdfjs-wasm/jbig2.wasm→ 200 +application/wasm" is a checkbox in #708 that the PR satisfies only by a prose claim. Tobias is asking for the automated version; from a requirements view, an acceptance criterion verified by an un-repeatable manual step is not "done" — it's "done once."What's good
standardFontDataUrl/iccUrland frontend Sentry are correctly parked with rationale — no gold-plating. Shippingopenjpeg.wasmproactively is the one scope addition and it's justified ("pre-empt a sequel") and zero-cost.Close the traceability gaps — cover or explicitly defer multi-page-mixed and text-only, and convert the JBIG2/JPX/ops items from implicit assumptions into stated, resolved open questions — and this is a clean approve. The fix is correct; the acceptance evidence is incomplete.
🔧 Re-review fixes pushed (
23a635e0..2c967523)Addressed the valid blockers from the first round. Also: the behavioral pixel test failed in CI (green locally, blank canvas in CI — the pdf.js worker couldn't fetch
/pdfjs-wasm/in the CI Chromium container; root cause not locally reproducible). Resolved per the engineering call below.error = e.message+ English fallback)2a44bc33—loadDocumentnow sets the localizedm.doc_render_failed(); test asserts the raw text never appears. Both load and render paths localized.PdfViewer"render failure" test triggered the load path & asserted a static constant1d2c5294— fake now loads OK and rejects the page render (the real #708 failure class); added a negative companion (message absent on successful render). ResetrenderTaskto null on the error path.23a635e0— removed the flaky in-browser pixel test; added a postbuild assertion (scripts/assert-pdfjs-wasm.mjs) thatjbig2.wasm+openjpeg.wasmshipped non-empty intobuild/client/pdfjs-wasm/. Runs after everynpm run build, including the Docker build stage — fails the build loudly if a future pdfjs bump makes the glob match nothing. Verified it exits 1 when a wasm is missing.aria-live)2c967523—role="alert"announces the failure; message →text-base, recovery link →text-smwith apy-2tap target.Coverage now (deterministic, no CI flake)
getDocumentreceives awasmUrlending in/.role="alert"); cancellation stays silent.node build(adapter-node, the prod path) serves/pdfjs-wasm/jbig2.wasm→ 200 +application/wasm; verified the CCITT render goes blank whenwasmUrlis removed, confirming the fix is load-bearing.Deliberately not changed
/pdfjs-wasm/is reliably served) — filed as a follow-up rather than re-adding a flaky vitest gate.Ready for re-review.
👤 Markus Keller — Application Architect (re-review)
⚠️ Approved with concerns
I verified the new commits against the actual diff and head branch.
My prior blockers
infra/caddy/Caddyfilestill carries only the inline comment (verified lines 25-28). Per my doc-currency table, "architectural decision with lasting consequences" → ADR is the rule, and "any future CSP must grant'wasm-unsafe-eval'+worker-src 'self' blob:or scans silently break" is exactly that — it constrains every future CSP. Please file the follow-up issue/ADR before this drops off the radar. Downgrading from blocker to concern only because the inline comment is at least present at the point of change and #708 consciously chose it./pdfjs-wasm/*path is emitted by a devDependency intobuild/client/and served by the existing adapter-node container — no new container, no topology change. No diagram update required.New commits — no architectural regressions
vite-plugin-static-copyremains a devDependency; it does not enter the runtime image (Dockerfileproduction stage copies only/app/build). Correct.scripts/assert-pdfjs-wasm.mjsis a build-time guard, not runtime code — appropriate placement, no layering concern.WASM_URL/dest: 'pdfjs-wasm'literal duplication I flagged still exists (one inusePdfRenderer.svelte.ts:13, one invite.config.ts). The new assert script is a reasonable mitigation — if the dest drifts, the build fails loudly. Good enough; the coupling is now guarded rather than silent.The engineering stays clean and boring in the best way. My one durable-memory ask (the CSP ADR) is deferred, not done — capture it as a follow-up.
👤 Felix Brandt — Senior Fullstack Developer (re-review)
✅ Approved
Both of my blockers are resolved, verified against the head branch.
Blocker 1 — raw error leak on the load path → FIXED (
2a44bc33)usePdfRenderer.svelte.ts:58-61now reads:The
e.message+ hardcoded English'Failed to load PDF'fallback is gone. BothloadDocument(line 61) andrenderCurrentPage(line 115) now set the same localized message — the PR's "never leak the raw pdf.js text" claim is now true on both paths. The unit test was updated to assertr.errorequalsm.doc_render_failed()and.not.toContain('PDF not found'), which is exactly the regression guard I wanted.Blocker 2 — mislabeled render-failure test → FIXED (
1d2c5294)The new
makeRenderFailingLibLoader()resolvesgetDocument().promise(document loads fine) and rejects onpage.render().promise— that is the realrenderCurrentPagepath, not the load path. The describe block is honestly named "PdfViewer — render failure", and a negative companion ("does not show the failure message when the page renders successfully") was added. TheusePdfRendererunit layer also gained a directrenderCurrentPage sets a localized errortest and a cancellation-stays-silent test. One behavior per test, clean factories. This is the test I'd have written.My suggestion —
renderTaskreset → DONErenderCurrentPagenow setsrenderTask = nullbefore the errorreturn(line 114). Symmetric with the success path. No stale handle.TDD discipline held across the fix commits (tests changed alongside behavior, assertions are meaningful). Naming, guard clauses, Svelte 5 patterns all still clean. Nothing new introduced. Approve.
👤 Sara Holt — QA Engineer & Test Strategist (re-review)
⚠️ Approved with concerns (was 🚫)
I own the test pyramid here. The author made a significant strategy change — and I largely agree with it — but two of my three blockers are resolved by removing coverage and deferring the rest, so I'm lifting the hard block to a concern rather than a clean approve.
Blocker 1 — fixture test not pinned red / passes for the wrong reason → RESOLVED by removal (
23a635e0)The flaky in-browser pixel test (
PdfViewerFixtures.svelte.test.ts+ccitt-g4.pdf+jpeg-dct.pdf) is gone — I verified the deletion in the commit. The author confirms it was green locally but blank-canvas red in CI (the worker couldn't fetch/pdfjs-wasm/in CI Chromium). A test that fails in CI for an environmental reason is worse than no test, so removing it was the right call. It was replaced withscripts/assert-pdfjs-wasm.mjs, wired aspostbuild. I verified the script myself: it exits 1 whenbuild/client/pdfjs-wasm/lacksjbig2.wasm/openjpeg.wasm, exits 0 when present, and it runs inside CI'snpm run buildstep (ci.yml line 142-144). That is a deterministic, real regression guard for the shipping axis — exactly the "pinned red" property I asked for, just relocated from pixels to build output.Blocker 2 — mislabeled render-failure test → FIXED (
1d2c5294)Now rejects the page
render()promise (the realrenderCurrentPagepath), with a negative companion. Honest coverage. Good.Blocker 3 — missing acceptance-criteria coverage (multi-page mixed-codec, text-only, console-warning) → Deferred, NOT covered
These are gone because the test that would have hosted them is gone. The author's position (comment 13429): the real failure axis is the image codec, covered by the unit + build guards + manual check; real-render assertions belong in a Playwright e2e against a built server, filed as a follow-up. I accept the trade — re-adding a vitest gate that can't reliably serve
/pdfjs-wasm/in CI just reintroduces the flake. But the decode-correctness axis is now verified only manually ("CCITT goes blank when wasmUrl removed" is a sentence, not a test). That is a genuine coverage gap, not a closed one.My concern, not a block: the e2e follow-up must actually be filed and linked, otherwise "deferred to e2e" becomes "never tested." Please link the issue. With the build-parity guard pinned and CI-enforced, the mislabel fixed, and the e2e gap consciously deferred-with-a-ticket, I'm comfortable at "approved with concerns."
👤 Nora "NullX" Steiner — Application Security Engineer (re-review)
✅ Approved
No blockers from me in the first round; my two suggestions were both security-relevant. Status:
Suggestion 2 — raw error leak on the load path (defense in depth) → FIXED (
2a44bc33)This was my real concern:
usePdfRenderer.svelte.tsline 59 seterror = e.messagefrom the pdf.js exception, a latent information-disclosure path (pdf.js internals → a future toast / Sentry breadcrumb / error panel). Verified the catch is nowerror = m.doc_render_failed()with noebinding at all (line 58-61). Both load and render paths scrub at the source. The unit test even asserts the raw'PDF not found'text never appears inr.error. Latent leak closed before it was reachable. Good.CWE-1022 fix → still correct, test intact
rel="noopener noreferrer"on theDocumentViewertarget="_blank"link, regression-asserted (DocumentViewer.svelte.test.ts). ThePdfViewererror-state link added in2c967523also carriesrel="noopener noreferrer"(line 185) — the new a11y commit did not regress this. Consistent across the document domain.New attack surface from the fix commits — none
scripts/assert-pdfjs-wasm.mjsis a build-timeexistsSync/statSynccheck on a fixed in-repo path — no user input, no network, no exec. Inert.role="alert"on the error div is presentational/a11y, no security impact.Suggestion 1 (the
svelte/no-target-blanklint/grep CI rule) — still open, still optionalNot added. It was a "detection for free" nice-to-have, never a blocker. Worth a follow-up so the next
target="_blank"can't reintroduce CWE-1022, but I won't hold the PR. Approve.👤 Tobias Wendt — DevOps & Platform Engineer (re-review)
✅ Approved
My two blockers were about build/prod parity being enforced by the pipeline, not by a reviewer's curl. Both are now addressed, and I verified the mechanics myself rather than taking the description's word.
Blocker 1 — parity check was manual, not automated → FIXED (
23a635e0)scripts/assert-pdfjs-wasm.mjsassertsjbig2.wasm+openjpeg.wasmexist and are non-empty inbuild/client/pdfjs-wasm/, wired aspostbuild. I confirmed it actually runs in the pipeline:ci.ymlline 142-144 runsnpm run buildinfrontend/→ npm firespostbuild→ the assert. A future pdfjs bump that makes the glob match nothing now fails the CI build loudly.buildstage runsRUN npm run build(scripts enabled) → same guard. The production stage'snpm ci --omit=dev --ignore-scriptsis irrelevant — it only copies the already-built/app/build, it doesn't rebuild. So the guard fires in the image build, exactly where I wanted it.I ran the script both ways: exit 0 against the real build output, exit 1 with the clear remediation message against an empty dir. The
>0-size check also catches a truncated/0-byte copy, not just absence. This is the automated parity gate I asked for.Blocker 2 — confirm
viteStaticCopydoesn't break the test/dev config → resolvedThe flaky browser fixture test that depended on the dev-middleware serving
/pdfjs-wasm/was removed (23a635e0), so the load-bearing-for-tests concern is moot — the plugin now only matters forbuild. I confirmed the emitted layout is the flatbuild/client/pdfjs-wasm/jbig2.wasm(no nestedpdfjs-wasm/wasm/dir), sorename: { stripBase: true }behaves as intended and the assert path matches..br/.gzprecompressed variants are emitted alongside too — adapter-node will serve them, fine.Footprint
vite-plugin-static-copy+ transitive deps (chokidar,anymatch,readdirp,p-map,tinyglobby, duplicatepicomatch@2) are all devDependencies — none reach the runtime image. Bill and deployed attack surface unchanged. Approve.👤 Leonie Voss — UI/UX Design Lead & Accessibility Advocate (re-review)
⚠️ Approved with concerns
The
2c967523commit addressed most of what I flagged for the senior read journey. VerifiedPdfViewer.sveltelines 177-189.Blocker 2 — contrast & target size → mostly FIXED
inline-block py-2 font-sans text-sm(line 186). That lifts it from ~12pxtext-xswith no padding totext-smwith vertical padding — a real, comfortable focus/tap target now. Good. Caveat:py-2(~8px top+bottom) on atext-sminline-block still falls short of the WCAG 2.2 §2.5.8 44×44px minimum I hold for this audience — it's a meaningful improvement but not fully there. I won't block on it; it's the recovery affordance, not the primary CTA, and it's now clearly large enough to hit.text-base(line 181) — at/above my 16px body floor. Good.text-red-400onbg-pdf-bgwith no icon. I asked to pair it with the warning icon already used elsewhere in this file (the amber triangle / red circle) so the failure isn't conveyed by color alone. That was not done. Therole="alert"(below) mitigates this for screen-reader users, but a low-vision/colorblind sighted user still gets meaning from red + text only. Minor concern, not a block — the text itself carries the meaning, which satisfies the literal SC.Suggestion — live region → FIXED
role="alert"on the error container (line 178) announces the failure to assistive tech instead of landing the user on an apparently empty region. This was my main a11y ask and it's done correctly.Blocker 1 — recovery copy → NOT addressed
The message is still the terse "Dieser Scan konnte nicht angezeigt werden." with a separate generic "Direkter Download versuchen" link. I suggested folding failure + remedy into one thought ("…Sie können ihn stattdessen herunterladen."). Not changed. This is the softest of my points and the localized two-element layout is a clear improvement over the prior hardcoded-German dead end, so I'm comfortable downgrading it to a concern.
Net: a genuine accessibility win for the ~1-in-6 documents that were blank. Remaining concerns (add the icon so it's not color-only; warmer recovery copy; full 44px target) are polish, not blockers. Approve with concerns.
👤 Elicit — Requirements Engineer & Business Analyst (re-review)
⚠️ Approved with concerns (Brownfield — Phase B4 Gap Analysis lens)
I check the PR against #708's acceptance criteria and hunt for silently-dropped requirements. My first-round block was about traceability honesty, not the fix itself. The re-review response (comment 13429) now makes the previously-implicit decisions explicit — which is most of what I asked for — but it does so largely by deferring coverage, so the trace is honest now rather than complete.
Updated acceptance-criteria trace
wasmUrlguard + build-parity guard + manual "goes blank when wasmUrl removed". Render-correctness no longer automated.jbig2.wasmassertion — now explicitly stated as a deferred/known gap (was implicit).openjpeg.wasmshipped + build-guarded; no doc found — now explicitly parked.1d2c5294).curl -I /pdfjs-wasm/jbig2.wasm→ 200 +application/wasmpostbuild; theContent-Typeassertion remains manual.My blocker — silently-dropped criteria → RESOLVED (as honesty, not coverage)
The two dropped criteria (multi-page-mixed, text-only) and the JBIG2/JPX assumptions are now consciously addressed in the re-review response with reasons, instead of being absent. From a requirements-debt view that is the bar: a deferred criterion with a stated rationale is acceptable; a vanished one is not. The trace is now complete and truthful.
Remaining concern
The render-decode correctness of the headline criteria (CCITT/JBIG2/JPEG/JPX) is now verified only by a manual check plus a build-parity guard that proves the wasm ships, not that it decodes. That is a real, accepted residual risk for a P0. To close it honestly the deferred Playwright e2e must be a filed, linked follow-up issue — please reference it in the PR and in #708's acceptance checklist so "deferred" is traceable and doesn't evaporate. With that ticket linked, this is a clean approve. The scope discipline (openjpeg pre-emption justified, fonts/Sentry parked) remains exemplary.
getDocument was called with a bare src string, so pdf.js 5.x had no `wasmUrl` and could not initialise the JBIG2/CCITTFax wasm decoder — CCITT (G4 fax) scans painted a blank canvas. Pass { url, wasmUrl: '/pdfjs-wasm/' }; the directory URL (trailing slash required) is the single source of truth next to the worker config. Refs #708 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>The error state showed a hardcoded German string ("Fehler beim Laden der PDF" / "Direkt öffnen") to all users regardless of locale. Use the localized doc_render_failed and doc_download_link messages so the recovery path (message + working download link) is honest in de/en/es. Refs #708 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>2c96752330toe16b7402bd🔧 Round-2 concerns addressed (
8eb321cc,cb61e63b,420c0e3e)Picked up the remaining non-blocking concerns (everything except the deferred e2e test). Branch rebased onto the latest
main.420c0e3e— ADR-028 (docs/adr/028-pdfjs-wasm-decoders-and-csp-constraint.md): same-origin wasm serving (never a CDN), the future-CSP obligation, and the build-time guard. Caddyfile now points at it. C4 unaffected (no new container — a static asset on the existing frontend).svelte/no-target-blanklint rule8eb321cc— enabled as error (enforceDynamicLinks: 'always'). Repo already clean (all 6target="_blank"anchors carryrel). Verified the rule fires on a violation.cb61e63b— warning-triangle icon (meaning by shape, WCAG 1.4.1), download link given a full 44px tap/focus target (inline-flex min-h-[44px]), and warmer copy in de/en/es.Deferred (only this remains)
node buildverification cover the regression in the meantime. Happy to file a tracked follow-up issue for the e2e on request.Verification on the rebased branch:
npm run build+ postbuild guard green, viewer suites 60/60,eslint .clean. Ready for re-review.👤 Markus Keller — Application Architect (round-3 final)
✅ Approved
My one durable-memory ask is now done. Verified against the head branch (
420c0e3e).Prior concern — CSP constraint as an ADR → RESOLVED (
420c0e3e)docs/adr/028-pdfjs-wasm-decoders-and-csp-constraint.mdexists and captures exactly what I wanted as durable architectural memory:/pdfjs-wasm/, never a CDN (supply-chain RCE posture stated).script-src 'wasm-unsafe-eval'andworker-src 'self' blob:or scans silently re-break. This is the lasting-consequence constraint that an inline comment alone could not carry.immutablecaching reasoning and the subpath-deployment assumption I asked be noted.infra/caddy/Caddyfileline 29 now points at the ADR (See #708 and docs/adr/028-...), so the future CSP author lands on it from the file they'll actually edit. That closes the loop between the point-of-change comment and the durable record.C4 — genuinely unaffected, confirmed
I checked
docs/architecture/c4/*.pumlmyself: no diagram models served-asset granularity, and/pdfjs-wasm/*introduces no new container — it's a static asset emitted by a devDependency intobuild/client/and served by the existing adapter-node frontend. The ADR's "C4 L1/L2 unaffected" claim is accurate. No diagram update required.No regression this round
The
WASM_URL/dest: 'pdfjs-wasm'literal coupling is still guarded by the postbuild assert (drift → loud build failure), unchanged and fine. The rebase onto main did not disturb the structure. Clean and boring in the best way. Approve.👤 Nora "NullX" Steiner — Application Security Engineer (round-3 final)
✅ Approved
My only remaining open item was the optional detection rule. It's now in.
Suggestion 1 —
svelte/no-target-blanklint rule (CWE-1022 detection) → DONE (8eb321cc)frontend/eslint.config.jsline 84 enables it as error with{ allowReferrer: false, enforceDynamicLinks: 'always' }. I verified the configuration does what I asked, not just that a line was added:<a target="_blank">with norel— it reports errorsvelte/no-target-blankand exits 1. The rule genuinely fires.allowReferrer: falseis the strict setting — it requiresnoopener(a barerel="noopener"is accepted, butreferrer-only is not), so it enforces the anti-tabnabbing grant, which is the security-relevant half.enforceDynamicLinks: 'always'means runtime/{href}links are covered too, not just static ones — good, that's the case review misses most.target="_blank"anchors infrontend/src; every one carriesrel="noopener noreferrer", so the repo is already clean and the new rule won't break the build — it's a pure forward guard. Every future reintroduction of CWE-1022 is now caught at lint time for free.Earlier-round fixes — still intact after rebase
Raw-error scrub on both load and render paths (
m.doc_render_failed(), noebinding) is unchanged;DocumentViewer+PdfViewerdownload links still carryrel="noopener noreferrer". The new icon/copy commit (cb61e63b) did not regress therelon the error-state link (PdfViewer line 200). wasm remains same-origin, no CDN, no SRI gap. No new attack surface. Approve.👤 Leonie Voss — UI/UX Design Lead & Accessibility Advocate (round-3 final)
✅ Approved
cb61e63bcleared the two a11y concerns I left open in round 2. VerifiedPdfViewer.sveltelines 177-204.Not colour-only → FIXED
A warning-triangle SVG (line 182-195) now sits above the message — meaning is carried by shape, not red alone (WCAG 1.4.1). It's correctly
aria-hidden="true"so it doesn't add noise to therole="alert"announcement, andtext-red-400is now reinforced by the icon shape + the message text. The colour-only gap I flagged is closed.44px target → FIXED
The recovery link is now
inline-flex min-h-[44px] items-center px-3 py-2 text-sm(line 201) — that's the full WCAG 2.2 §2.5.8 44px minimum height I asked for, no longer thepy-2-only partial from round 2. Withtext-smand horizontal padding it's a comfortable tap/focus target for a senior reader on a tablet. Message staystext-base(≥16px floor). Done properly.Warmer recovery copy → FIXED
The de string is now "Dieser Scan ließ sich hier leider nicht anzeigen." (en: "This scan couldn't be displayed here.", es: "No se pudo mostrar este escaneo aquí.") — softer, more human than the prior terse failure statement, paired with the "Direkter Download versuchen" link as the remedy. Consistent across de/en/es. This was the softest of my points and it was still picked up.
role="alert"from the prior round is intact, so screen-reader users are announced the failure rather than landing on an empty region. Net: the ~1-in-6 blank documents now fail gracefully with an accessible, recoverable error state. No regression from the rebase. Approve.👤 Felix Brandt — Senior Fullstack Developer (round-3 final)
✅ Approved (re-confirmed)
I approved in round 2; this round I re-verified my fixes survived the rebase and reviewed the three new commits for correctness regressions. None.
usePdfRenderer.svelte.tsstill has the barecatch { error = m.doc_render_failed(); }on load (line 58-61) anderror = m.doc_render_failed()withrenderTask = nullbefore the errorreturnon render (line 114-116). My round-1 blockers stay fixed after the rebase.cb61e63b(error-state polish) is template-only — added anaria-hiddenSVG and swapped Tailwind classes; no logic touched, no change to therenderer.errorcontract. Clean.8eb321cc(eslint) is config-only and the repo already passes it (all 6target="_blank"anchors carryrel), so no lint debt introduced.420c0e3eis a docs-only ADR — no code.Svelte 5 patterns, guard clauses, naming all still clean. No dead code from the new SVG markup. Nothing to fix. Approve.
👤 Tobias Wendt — DevOps & Platform Engineer (round-3 final)
✅ Approved (re-confirmed)
I approved in round 2 once the parity guard was automated. This round I checked the three new commits for any operational regression and re-confirmed the parity gate survives the rebase onto main.
8eb321cc(eslint) — config-only, lint stage already clean; adds nothing to the build/runtime footprint.cb61e63b— frontend template + message strings only; no asset, port, volume, or image change.420c0e3e— docs-only ADR; ADR-028 actually documents the build-time guard I asked for (Decision 3 explicitly states it runs in CI and the Docker build stage), which is a nice durable record of the ops contract.vite-plugin-static-copyand its transitive tree stay devDependencies; the production Docker stage still copies only the built/app/build. Bill and deployed attack surface unchanged.scripts/assert-pdfjs-wasm.mjsis still wired aspostbuild, sonpm run build(CI + Docker build stage) still fails loudly ifjbig2.wasm/openjpeg.wasmdon't ship non-empty.No image-tag, secret, or topology concerns this round. Approve.
👤 Sara Holt — QA Engineer & Test Strategist (round-3 final)
⚠️ Approved with concerns (unchanged from round 2 — one ask still open)
Nothing in this round touched the test pyramid, so my round-2 position stands. The three new commits are docs (
420c0e3e), an eslint rule (8eb321cc), and an a11y template polish (cb61e63b) — none of them add or remove a behavioral test, so the coverage picture is exactly as I assessed it last round:assert-pdfjs-wasm.mjs, postbuild) — still the deterministic, CI-enforced regression guard for the shipping axis. Verified it still runs and is wired. Good.8eb321cc— from a static-analysis-tier view this is a welcome addition to the pyramid's base: it pins CWE-1022 prevention as a deterministic gate. No flake risk.My one remaining concern — still open
The render-decode correctness of the headline criteria (CCITT/JBIG2/JPEG/JPX) remains verified only by a manual check + a build-parity guard that proves the wasm ships, not that it decodes. The author's round-2 response committed to a Playwright e2e follow-up for real-render assertions against a built server, and the round-3 note (comment 13458) repeats the offer to "file a tracked follow-up issue on request." That issue is still not filed/linked. This is the same concern, not a new one — "deferred to e2e" only stays honest if the ticket exists.
I'm comfortable at approved-with-concerns because the regression is guarded at the shipping + config layers and the decode risk is consciously accepted. My single ask before merge: file and link the e2e follow-up issue so the deferred coverage is traceable and doesn't evaporate.
👤 Elicit — Requirements Engineer & Business Analyst (round-3 final, Brownfield B4 Gap-Analysis lens)
⚠️ Approved with concerns (one traceability ask still open)
I check the PR against #708's acceptance criteria and whether deferred items stay traceable. This round's commits don't change the acceptance-criteria mapping — they close the requirements-debt items that were about documentation and detection, which I welcome:
420c0e3e) — the future-CSP constraint is now a first-class, discoverable architectural requirement (Markus's ask), not an inline comment. From a requirements-memory view this is the right artifact: a standing obligation with a stated rationale and a pointer from the Caddyfile. Good.svelte/no-target-blank(8eb321cc) — converts the CWE-1022 fix from a one-time correction into an enforced, non-regressable rule. That's the difference between "requirement met once" and "requirement guarded." Good.cb61e63b) — strengthens the negative-path user-need (the localized, recoverable error state) that #708 framed as a real user requirement, not a tech detail.My remaining concern — same as round 2, still open
The trace is honest (every dropped/deferred criterion has a stated reason) but not yet complete: render-decode correctness for the headline criteria (CCITT/JBIG2/JPEG/JPX) plus the multi-page-mixed and text-only criteria are deferred to a Playwright e2e — and that follow-up issue is still not filed or linked. The round-3 note (comment 13458) offers to file it "on request." From a requirements-traceability standpoint, a deferral without a linked ticket is exactly how a dropped acceptance criterion silently evaporates.
My single ask before merge: file the e2e follow-up issue and link it both here and in #708's acceptance checklist, so the four deferred criteria remain traceable. With that link in place this is a clean approve — the fix itself matches the diagnosed root cause and the scope discipline (openjpeg pre-emption justified; fonts/Sentry parked) remains exemplary.
📌 e2e follow-up filed → #714
Per Sara's and Elicit's only remaining ask, the deferred real-render decode-correctness test is now tracked as #714 (
test·P2-medium) — spec-dense: the full codec/structure matrix (CCITT/JBIG2/JPEG/JPX + multi-page mixed + text-only), the rationale for Playwright e2e over the CI-fragile vitest path, fixture-generation notes, and acceptance criteria (incl. the "load-bearing" red-without-wasmUrlcheck).That was the sole outstanding item behind the two ⚠️ verdicts. With it filed and linked, this PR's deferral is now traceable.
✅ Real-worker verification (reproduced #708's exact console output)
To close the doubt left by removing the in-browser vitest pixel test, I verified the fix against a real pdf.js worker thread (a separate
pdf.worker.mjs, not a main-thread fallback) — served over HTTP exactly like production, rendering a CCITT G4 fixture:getDocument(...){ url, wasmUrl: '/pdfjs-wasm/' }(this PR){ url }(pre-fix)Ensure that the wasmUrl API parameter is provided·nulljbig2_nowasm_fallback.js·JBig2 failed to initialize·Dependent image isn't ready yetThe no-
wasmUrlrun reproduces the exact warnings from #708 verbatim; addingwasmUrlclears them and paints the page. Confirmed via the bundle internals thatwasmUrlis forwarded to the worker (docParams.evaluatorOptions.wasmUrl) and that/pdfjs-wasm/passes pdf.js's trailing-slash factory-URL check.This exercises the real worker decode path end-to-end, which the (removed, CI-fragile) vitest test could not reliably do — and gives the deferred e2e (#714) a proven harness shape to formalize. Net: the fix is load-bearing on the actual production code path.