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* 📄 feat: Rich File Artifact Previews for DOCX, CSV, XLSX, PPTX Render office files emitted by tools as interactive previews in the artifact panel instead of raw extracted text. The backend produces a sanitized HTML document via mammoth (DOCX), SheetJS (CSV/XLSX/XLS/ODS), or yauzl-based slide extraction (PPTX) and ships it through the existing SSE attachment payload; the client routes it through the Sandpack `static` template's `index.html` slot — no new browser deps, no client-side blob fetch, no React renderer components. * 🔐 fix: Restrict data: URLs to <img> in office HTML sanitizer Codex review on #12934 caught that `data:` lived in the global `allowedSchemes`, which meant a smuggled `<a href="data:text/html, <script>...</script>">` would survive sanitization. The Sandpack iframe sandbox does not gate `target="_blank"` navigations, so a click would open attacker-controlled HTML in a new tab. Scope `data:` to `<img src>` only via `allowedSchemesByTag` (mammoth inlines DOCX images as base64 `data:image/...` URIs — that path still works). Add a regression suite (`sanitizeOfficeHtml security`) with 8 cases covering: <script> stripping, event-handler removal, javascript:/data: rejection on anchors, data:image preservation in <img>, http/https/mailto allowance, target=_blank rel=noopener enforcement, and <iframe> stripping. * 🔧 fix: Route extensionless office files by MIME alone Codex review on #12934 caught that the office-render gate in `extractCodeArtifactText` only fired when the extension was in `OFFICE_HTML_EXTENSIONS` or the category was `document`/`pptx`. A tool emitting `data` with `text/csv` (no extension) classifies as `utf8-text`, so the gate was skipped and raw CSV text shipped to the client — but the client routes by MIME to the SPREADSHEET bucket expecting a full HTML document, so the panel rendered broken text. Extract a shared `officeHtmlBucket(name, mime)` predicate from `html.ts` (returns the bucket name or null). Both `bufferToOfficeHtml` (the dispatcher) and the upstream gate in `extract.ts` now go through this single source of truth, so they can never drift apart again. The predicate already mirrors the dispatcher's extension/MIME logic (extension wins; MIME is the fallback for extensionless inputs). Adds: - 14 cases for the new `officeHtmlBucket` predicate covering the positive paths (each bucket via extension OR MIME) and the negative paths (txt, py, json, jpg, pdf, zip, odt, plain noext). - A direct regression test in `extract.spec.ts` for the Codex catch: `data` with `text/csv` + utf8-text category routes through the office HTML producer. - Parameterized cases for extensionless DOCX/XLSX/XLS/ODS/PPTX files identified by MIME alone. * 🛡️ fix: Enforce extension-wins precedence in officeHtmlBucket Codex review on #12934 caught that the predicate's if-chain interleaved extension and MIME checks for each bucket — e.g. CSV's branch was `ext === 'csv' || CSV_MIME_PATTERN.test(mimeType)`. A `deck.pptx` shipped with `text/csv` (sandboxed tools sometimes ship generic MIMEs) matched the CSV branch BEFORE the PPTX extension branch was reached, so a binary PPTX would have been handed to `csvToHtml` to parse as text — yielding garbage or a parse exception. Restructure to a strict two-pass dispatch: an exhaustive extension table first (one lookup, all known extensions), then MIME-only fallback for extensionless / unknown-ext inputs. The doc comment's "extension wins" claim is now actually enforced by the implementation. Add 7 regression cases covering the conflicting-MIME footgun for each bucket: deck.pptx + text/csv → pptx; workbook.xlsx + text/csv → spreadsheet; legacy.xls + pptx-MIME → spreadsheet; report.docx + text/csv → docx; data.csv + docx-MIME → csv; etc. * 🛡️ fix: Reject zip-bomb office files before in-process parsing (SEC) Addresses pre-existing availability vulnerability validated by SEC review (Codex finding 275344c5...) and made worse by this PR's HTML rendering path. A sub-1MiB compressed XLSX/DOCX/PPTX (highly compressed run-of-zeros) inflates to 200+ MiB of XML when handed to mammoth/xlsx — blocking the Node event loop for 10+ seconds and spiking RSS to ~1 GiB. The existing 8s `withTimeout` wrapper uses `Promise.race`, which can only return early; it cannot interrupt synchronous parser CPU/RAM consumption. PoC ran an authenticated execute_code call to OOM the API process. Add `assertSafeZipSize(buffer)` — a yauzl-based pre-flight that streams every entry with mid-inflate byte counting and bails on either a per-entry or total decompressed-size cap. Mid-inflate counting cannot be bypassed by falsifying the central directory's `uncompressedSize` field (the technique the PoC used). Defaults: 25 MiB per entry, 100 MiB total — generous headroom for legitimate image-heavy office files, well below the attack profile. Hook the check into every path that hands a buffer to mammoth/xlsx /yauzl: - New HTML producers (`wordDocToHtml`, `excelSheetToHtml`, `pptxToSlideListHtml`) — added by this PR - Legacy RAG text extractors (`wordDocToText`, `excelSheetToText` in `crud.ts`) — pre-existing path, also vulnerable Errors propagate as a tag-distinct `ZipBombError` so callers can distinguish a refused bomb from generic parse failures. The outer `extractCodeArtifactText` swallows the error and returns null, falling back to the regular download UI. `.xls` (BIFF/CFB binary, not ZIP) is detected by magic bytes and skipped — yauzl would reject it as malformed anyway. Adds 15 tests: - `zipSafety.spec.ts` (9): benign passes, per-entry cap, total cap, ZipBombError type-tagging, malformed-zip distinction, directory- entry handling, named-error surfacing, and the SEC-PoC pattern (sub-1 MiB compressed → 50 MiB inflated rejected on default caps). - `html.spec.ts` zip-bomb suite (5): each producer rejects a bomb; dispatcher propagates correctly; legitimate fixtures still render. - `extract.spec.ts` (1): outer extractor swallows ZipBombError and returns null so the download UI fallback fires. * 🧹 fix: Normalize MIME parameters; add legacy CSV MIME variant Two related Codex catches on PR #12934 — both about MIME-routing inconsistencies between backend and client that would cause extensionless CSV files to render as broken (raw text under an HTML slot) or skip the artifact panel entirely. P2 — backend MIME normalization: `officeHtmlBucket` matched MIME strings exactly, so a real-world `text/csv; charset=utf-8` Content-Type slipped through and the backend returned raw CSV text. The client's `baseMime` helper strips parameters before its own MIME lookup, so it routed the same file to the SPREADSHEET bucket expecting an HTML body that never arrived. Mirror the client's normalization on the backend (strip everything from `;` onward, lowercase) before bucket matching. P3 — client legacy CSV MIME: Backend's `CSV_MIME_PATTERN` accepts three variants (`text/csv`, `application/csv`, `text/comma-separated-values`); the client's `MIME_TO_TOOL_ARTIFACT_TYPE` only had the first two. An extensionless file with `text/comma-separated-values` would have backend HTML produced but the client would skip the artifact panel entirely. Add the missing variant. Tests: - 9 new parameterized-MIME cases on backend covering charset/ boundary/case variants for every bucket. - 1 new client routing case for `text/comma-separated-values`. * 🩹 fix: Try office HTML before short-circuiting on category=other Codex review on #12934 caught that the early `category === 'other'` return short-circuited before `hasOfficeHtmlPath` was checked. The classifier returns 'other' for inputs the new dispatcher can still route — extensionless `application/csv` (CSV MIMEs aren't in the classifier's text-MIME set and don't start with `text/`), and extensionless office MIMEs with parameters like `application/vnd... spreadsheetml.sheet; charset=binary` (the classifier's `isDocumentMime` exact-matches these MIMEs without parameter normalization). Both would route correctly through `officeHtmlBucket` but never reached it. Move the office-HTML attempt above the 'other' early return, and drop the `|| category === 'document' || category === 'pptx'` shortcut now that `hasOfficeHtmlPath` covers the same surface (with parameter normalization) and a wider one. ODT still routes through `extractDocument` unchanged — `hasOfficeHtmlPath` returns false for it and the `category === 'document'` branch below handles it. Adds 3 regression tests: - extensionless `application/csv` + category='other' → office HTML - extensionless parameterized office MIME + category='other' → office HTML - defense check: actual binary 'other' (image/jpeg) still returns null without invoking the office producer * 🛡️ fix: Office types are HTML-or-null (no text fallback → XSS) Codex P1 review on #12934 caught that when `renderOfficeHtml` failed (timeout, malformed file, zip-bomb rejection) for an office type, the extractor fell through to `extractDocument` and returned plain text. The client routes by extension/MIME to the office preview buckets and feeds `attachment.text` straight into the Sandpack iframe's `index.html`. A spreadsheet cell or document body containing the literal string `<script>alert(1)</script>` would have been injected as executable markup — direct XSS. The contract for office types is now HTML-or-null with no text fallback. Failed render returns null, the client's empty-text gate keeps the artifact off the panel, and the file falls back to the regular download UI (matching what PPTX already did). PDF and ODT still go through `extractDocument` because the client routes them to PLAIN_TEXT (which the markdown viewer escapes) or no artifact at all, so plain text is safe there. Test reshuffle: - `document` describe block now uses ODT/PDF for the legacy parseDocument-path tests (DOCX/XLSX/XLS/ODS bypass that path). - New "does NOT call parseDocument for office HTML types" test locks in the SEC contract for all four office HTML buckets. - "falls back to ..." tests rewritten as "returns null when ..." with explicit `parseDocumentCalls.length === 0` assertions to prove no text leaks back to the client. - New XSS regression test for the XLSX failure path. - Mock parseDocument failure-name match relaxed to `includes()` so ODT-named tests can use the same trigger. * 🧽 chore: Address follow-up review findings on PR #12934 Wraps up the 10-finding follow-up review. Two MAJOR + four MINOR + two NIT addressed; one NIT skipped after verifying it was a misread of the package.json structure. MAJOR - #1: Rewrite `renderOfficeHtml` JSDoc to document the HTML-or-null contract explicitly. The pre-fix doc described a text-fallback path that was the original XSS vector (commit b06f08a). A future maintainer trusting the stale doc could reintroduce the fallback. - #2: Replace byte-truncation of office HTML with a small "preview too large" banner document. Cutting at a UTF-8 boundary lands mid-tag (`<table><tr><td>con\n…[truncated]`) and ships malformed markup to the iframe — unpredictable rendering, occasional broken layouts on DOCX with embedded images / wide spreadsheets. MINOR - #4: Wrap `readSlidesFromZip`'s `zipfile.close()` in try/catch so a close-time exception (mid-flight stream) doesn't replace the original error. Mirrors the defensive pattern in zipSafety.ts. - #5: Refactor PPTX extraction to use `yauzl.fromBuffer` directly, eliminating the temp-file write/unlink the safety pre-flight already proved unnecessary. Removes 4 unused imports (os, path, fs/promises, randomUUID). - #6: Extract `isPreviewOnlyArtifact(type)` to `client/src/utils/ artifacts.ts` so the membership check is unit-testable without mounting the full Artifacts component (Recoil + Sandpack + media query). 15 new test cases covering positive types, negative types, null/undefined, and unknown strings. NIT - #3: Remove dead `stripColorStyles` / `COLOR_PROPERTY_PATTERN` — unused (sanitizer's `allowedStyles` config handles color implicitly). - #7: Remove dead `!_lc_csv_label` worksheet property write. - #9: Remove no-op `exclusiveFilter: () => false` sanitize-html config. - #10: Type-narrow `PREVIEW_ONLY_ARTIFACT_TYPES` to `ReadonlySet<ToolArtifactType>` so the membership table is compile-time checked against the enum. SKIPPED - #8: Reviewer flagged `sanitize-html` as duplicated in devDeps and dependencies. The package has no `dependencies` section — only `devDependencies` and `peerDependencies`. Existing convention (mammoth, xlsx, yauzl, pdfjs-dist) is to appear in BOTH. Removing the devDep entry would break local test runs. Tests: packages/api 4406/4406, client artifacts 128/128. * 🪞 chore: Fix isPreviewOnlyArtifact test description parameter order Follow-up review nit on PR #12934. Jest's `it.each` substitutes `%s` positionally, and the table rows were `[type, expected]` while the description template read `'returns %s for type %s'` — outputting "returns application/vnd.librechat.docx-preview for type true" instead of the intended "type ... returns true". Reorder the template to match the column order. Test runner output now reads naturally: "type application/vnd.librechat.docx-preview returns true". Pure cosmetic — runtime behavior unchanged. * ✨ feat: Improve DOCX rendering and surface filename in panel header Two UX improvements based on hands-on use of the office preview pipeline. DOCX rendering — mammoth strips the navy banners, cell shading, and column layouts that direct-formatted docs apply (python-docx-style output is a common case). The flat `<p><strong>X</strong></p>` and bare `<table><tr><td>` it emits looks washed out next to the source. Three targeted compensations: - Style map promotes `Title`, `Subtitle`, `Heading 1` thru `Heading 6`, and `Quote` paragraphs to their semantic HTML equivalents (mammoth's default only handles Heading 1-6, missing Title/Subtitle/Quote). - Extra CSS scoped to `.lc-docx` gives the first table row sticky- looking header styling regardless of `<thead>` (mammoth never emits `<thead>`), adds zebra striping, and treats the python-docx `<p><strong>X</strong></p>` section-heading idiom as a pseudo-h2 with a thin accent left border so document structure survives the round trip. Headings get a left accent or underline so they read as headings instead of just bold paragraphs. - Sanitizer's `allowedAttributes` opens `class` on the heading and block tags the styleMap and CSS heuristics rely on. `<script>`, event handlers, javascript: URLs, etc. are still stripped — the existing security regression suite catches any drift. Panel header — `Artifacts.tsx` showed a generic "Preview" pill for preview-only artifacts. Single-tab Radio is a no-op; surfacing the document filename there gives the user something useful in the chrome without taking real estate. `displayFilename` handles the sandbox dotfile suffix the upload pipeline applies. Tests: html.spec.ts +1 (new CSS-emission lock), 71/71. Backend files suite 428/428. Client 308/308. * ✨ feat: High-fidelity DOCX preview via docx-preview in iframe Switch the default DOCX render path from server-side mammoth → flat HTML to client-side `docx-preview` loaded inside the Sandpack iframe. Mammoth becomes the fallback for files above the cap. Why --- The Sandpack iframe is a real browser DOM. Server-side rendering ceiling for DOCX→HTML is well below the source's visual fidelity — mammoth strips cell shading, run colors, banners, and column layouts because Word's layout model doesn't fit HTML's flow model. Pushing the render into the iframe lifts that ceiling without paying the server-side cost of jsdom or LibreOffice. What ---- - New `wordDocToHtmlViaCdn(buffer)` builds a self-contained HTML doc that embeds the binary as base64 and lets `docx-preview@0.3.7` render it on load. CSS preserves dark/light mode handoff via `prefers-color-scheme`. Bootstrap script falls back to a "preview unavailable, please download" message if the CDN is unreachable or the parse throws. - `docx-preview` and its `jszip` peer dep are pinned to specific versions on jsdelivr with SRI sha384 integrity hashes and `crossorigin="anonymous"`. Refresh: re-fetch the file, run `openssl dgst -sha384 -binary FILE | openssl base64 -A`. - CSP locked down on the iframe: `default-src 'none'`, scripts only from jsdelivr (no eval), `connect-src 'none'` so a parser bug in docx-preview can't be turned into exfiltration of the embedded document, `base-uri 'none'`, `form-action 'none'`. Defense in depth on top of the Sandpack cross-origin sandbox. - `wordDocToHtml` dispatches by size: ≤ 350 KB binary → CDN path (high fidelity), larger → mammoth fallback (preserves the size cap on `attachment.text`). 350 KB chosen so worst-case base64-inflated output (~478 KB) plus wrapper overhead (~5 KB) fits under MAX_TEXT_CACHE_BYTES (512 KB) with 40 KB headroom. - Internal renderers exported as `_internal` for tests. Public API unchanged — callers still go through `wordDocToHtml`. PPTX intentionally NOT switched ------------------------------- Surveyed the available client-side PPTX libraries: - `pptx-preview@1.0.7` ships an ESM-only main entry plus a 1.36 MB UMD that references `require("stream"/"events"/"buffer"/"util")` — bundled for Node, not browser-clean. Could work but the runtime references to undefined Node globals are a fragility risk worth more validation than this PR can absorb. - `pptxjs` is jQuery-era, requires four separate UMD scripts in a specific order, less actively maintained. - The honest answer for PPTX is the LibreOffice sidecar (DOCX/XLSX/ PPTX → PDF → PDF.js), which is the architecture every major product (Google Drive, Claude.ai, ChatGPT) effectively uses and the only path to ~5/5 fidelity for arbitrary user decks. PPTX stays on the existing slide-list extraction for now. Open a follow-up issue for the LibreOffice/Gotenberg sidecar. Tests ----- - 6 new in CDN-rendered describe block: wrapper structure, base64 round-trip, SRI integrity + crossorigin, CSP locks (connect-src/eval/base-uri/form-action), fallback message wiring, size-threshold lock. - Adjusted 2 existing tests that asserted on mammoth-path artifacts (literal document text in `<article class="lc-docx">`) — those assertions move to the mammoth-fallback test that calls `_internal.wordDocToHtmlViaMammoth` directly. Dispatcher tests now assert CDN-path signatures instead. packages/api files: 434/434 ✅, full unit suite 4473/4473 ✅. * 🧷 fix: Address Codex P1 (MIME aliases) + P2 (CDN dependency) Two follow-up review findings on PR #12934, both real. P1 — Spreadsheet MIME aliases on client ---------------------------------------- Backend's `officeHtmlBucket` uses the broad `excelMimeTypes` regex from `librechat-data-provider` (covers `application/x-ms-excel`, `application/x-msexcel`, `application/msexcel`, `application/x-excel`, `application/x-dos_ms_excel`, `application/xls`, `application/x-xls`, plus the canonical sheet MIMEs). The client's exact-match `MIME_TO_TOOL_ARTIFACT_TYPE` only had three of those, so an extensionless XLS upload with a legacy MIME would have backend HTML produced but the client would fail to route the artifact at all — preview chip never registers. Fix: import the same regex on the client and add it as a fallback in `detectArtifactTypeFromFile` after the exact-match map miss. Stays in lock-step with the backend automatically. 7 new test cases — one per legacy alias. P2 — Hard CDN dependency on jsdelivr ------------------------------------- Air-gapped / corporate-filtered networks where jsdelivr is unreachable would see DOCX previews permanently degrade to "Preview unavailable" because the iframe could never load the renderer scripts. Mammoth was sitting right there on the server but the dispatcher always preferred the CDN path for files under 350 KB. Fix: `OFFICE_PREVIEW_DISABLE_CDN` env var. When truthy (`1`, `true`, `yes`, case-insensitive, whitespace-trimmed), `wordDocToHtml` short-circuits to the mammoth path regardless of file size. Operators on filtered networks set the env var; default behavior is unchanged. Read at function-call time (not module load) so jest can flip it in `beforeEach` without `jest.resetModules()`. The cost is one property access per render. 12 new test cases: env-unset uses CDN (default), all five truthy forms force mammoth, five non-truthy forms (`false`/`0`/`no`/empty/ arbitrary string) leave CDN active. Tests ----- packages/api/src/files: 446/446 ✅ (was 434, +12 from env-var matrix). client artifact suites: 235/235 ✅ (was 228, +7 from MIME aliases). * ✨ feat: High-fidelity PPTX preview via pptx-preview in iframe Mirrors the DOCX CDN architecture for PPTX: small files (≤350 KB binary) embed as base64 and render via `pptx-preview` loaded from jsdelivr inside the Sandpack iframe. Larger files and air-gapped deployments fall back to the existing slide-list extraction. Why --- PPTX is the format where the gap between LibreChat's preview and Claude.ai-style previews was most visible (slide-list of bullet points vs. rendered slide layouts). LibreOffice → PDF → PDF.js is still the eventual gold-standard answer for PPTX fidelity, but client-side rendering inside the Sandpack iframe gets us a meaningful intermediate step (~1.5/5 → ~3.5/5) without a sidecar. What ---- - `pptx-preview@1.0.7` (ISC license, ~1.36 MB UMD bundle that includes its echarts/lodash/uuid/jszip/tslib deps inline). Pinned to a specific version on jsdelivr with SHA-384 SRI and `crossorigin="anonymous"`. - `buildPptxCdnDocument` mirrors the DOCX wrapper: same CSP locks (`default-src 'none'`, `connect-src 'none'`, no eval, no base/form tampering), same `id="lc-doc-data"` base64 slot, same fallback message wiring (`typeof pptxPreview === 'undefined'` → "Preview unavailable"). - New public `pptxToHtml(buffer)` dispatcher; `bufferToOfficeHtml` switches its `'pptx'` case to call it. `pptxToSlideListHtml` stays exported as the slide-list-only path (still hit by tests directly and by the dispatcher fallback). - `OFFICE_PREVIEW_DISABLE_CDN=true` env-var hatch applies to PPTX too — air-gapped operators get the slide-list path. Same env-var read at call time, same matrix of truthy values (`1` / `true` / `yes` / case-insensitive / whitespace-trimmed). - `_internal` re-exports moved to after the PPTX section since the PPTX internals live further down in the file. Adds `pptxToHtmlViaCdn`, `MAX_PPTX_CDN_BINARY_BYTES`, `PPTX_PREVIEW_CDN`. Honest caveats -------------- - The 1.36 MB UMD bundle has `require("stream"/"events"/"buffer"/ "util")` references in its outer wrapper. Those are bundled-dep artifacts (likely from `tslib` / Node-shim transforms) and don't appear to execute on the browser code paths, but I haven't done manual e2e on a wide range of decks. If a class of files turns up that breaks rendering, the iframe-side fallback message catches it and operators have `OFFICE_PREVIEW_DISABLE_CDN=true` as the bail. - First-render CDN fetch is ~1.36 MB (browser-cached after). - PPTX with embedded media easily exceeds the 350 KB binary cap; those files take the slide-list path. Lifting the cap is a follow-up (tied to the broader self-hosting work). Tests ----- 11 new in two new describe blocks: - `pptxToHtml dispatcher`: routing predicate (small → CDN, env-set → slide-list). - `CDN-rendered path`: base64 round-trip, SRI integrity + crossorigin, CSP locks (connect/eval/base/form), fallback message, size-threshold lock at 350 KB. - `OFFICE_PREVIEW_DISABLE_CDN escape hatch`: env-var matrix for truthy values. packages/api/src/files: 457/457 ✅ (was 446, +11). * 🪟 fix: DOCX preview fills the artifact panel width docx-preview defaults to rendering at the document's native page width (8.5in for letter, 21cm for A4). In a wide artifact panel that left whitespace on either side; in a narrow one it forced horizontal scroll. Two changes: - Pass `ignoreWidth: true` to `docx.renderAsync` so the library skips the document's pageSize width and uses its container's width. - Defensive CSS overrides on `.docx-wrapper` and `.docx-wrapper > section.docx` in case a future library version regresses on the option, plus `padding: 0` on the wrapper to drop the page-edge whitespace docx-preview otherwise reserves. `renderHeaders`/`renderFooters`/etc. stay enabled — those still appear in the rendered output, just inside a container that fills the panel instead of a fixed-width "page." Tests unchanged (100/100); manual e2e ahead of merge. * 🩹 fix: PPTX black screen — allow blob: workers + harden bootstrap Manual e2e of the PPTX CDN renderer surfaced a black screen with "Could not establish connection. Receiving end does not exist." unhandled-rejection — characteristic of a Web Worker that couldn't start. Root cause: pptx-preview's bundled echarts dep spins up Web Workers via blob: URLs for chart rendering. Our CSP had `default-src 'none'` and no `worker-src`, so workers fell back to default → blocked. The async failure deep inside echarts didn't surface through the outer `previewer.preview()` promise, so my bootstrap's `.catch` never fired, the loading state was removed, and the iframe sat with the body background showing through (dark navy in dark mode = "black screen"). Three changes: - Add `worker-src blob:` to the PPTX CSP. Allows blob:-only worker creation without permitting arbitrary worker URLs. - Bootstrap: window-level `unhandledrejection` and `error` listeners so rejections from inside bundled-dep async pipelines surface as the user-facing "Preview unavailable" fallback instead of going silent. - Bootstrap: 8-second timeout that checks `container.children.length` — if the renderer hasn't appended anything visible by then, assume silent failure and show the fallback. Also wipe `container.innerHTML` when showing the fallback so a partial render doesn't compete with the message. DOCX wrapper unchanged: docx-preview doesn't use workers, so the worker-src directive doesn't apply, and the existing fallback path already covers its failure modes. Tests ----- - Existing PPTX CSP test now also asserts `worker-src blob:` is present. - Existing fallback-message test extended to cover the new unhandledrejection/error/timeout listeners. packages/api/src/files: 467/467 ✅. * 🔒 fix: gate office HTML routing on backend trust flag (textFormat) Codex P1 review on PR #12934: routing .docx/.csv/.xlsx/.xls/.ods/.pptx into the office preview buckets assumed `attachment.text` was already sanitized full-document HTML, but that guarantee only existed for the new code-output extractor path. Existing stored attachments and other non-code paths can still carry plain extracted text — `useArtifactProps` would then inject that as `index.html` inside the Sandpack iframe. Adds a `textFormat: 'html' | 'text' | null` trust flag persisted on the file record by the code-output extractor, surfaced over the SSE attachment payload and the TFile API type. The client's routing in `detectArtifactTypeFromFile` requires `textFormat === 'html'` before landing on an office HTML bucket; everything else (legacy attachments, RAG-extracted plain text from `parseDocument`, explicitly-marked 'text' entries) falls back to the PLAIN_TEXT bucket where the markdown viewer escapes content rather than executing it. Tests: new `getExtractedTextFormat` helper has 14 cases covering all office paths, legacy XLS MIME aliases, parseDocument fallthroughs, and null-input. Client `artifacts.test.ts` adds three security-gate tests proving downgrade behavior for missing/null/'text' textFormat, plus a `fileToArtifact` test that legacy office attachments without the flag end up in PLAIN_TEXT with their content escaped. * 🌐 fix: air-gapped DOCX preview — embed mammoth fallback in CDN doc Codex P2 review on PR #12934: the CDN-rendered DOCX path always pulled docx-preview + jszip from cdn.jsdelivr.net. Air-gapped or corporate- filtered networks where jsdelivr is blocked would degrade to a static "Preview unavailable" message even though the server already had a local mammoth renderer that could produce readable output. Now the dispatcher renders mammoth first and embeds the sanitized output inside the CDN document as a hidden `#lc-fallback` block. The iframe's existing `typeof docx === 'undefined'` check (which fires when the CDN scripts can't load) un-hides the fallback so the user sees a real preview. CDN-success path is unchanged: high-fidelity docx-preview output owns the viewport, mammoth fallback stays hidden. Two new safeguards in the dispatcher: - Size budget: if base64(binary) + mammoth body + wrapper > 512 KB (the `attachment.text` cache cap), drop to mammoth-only so a giant document still renders. The `OFFICE_HTML_OUTPUT_CAP` constant mirrors `MAX_TEXT_CACHE_BYTES` from extract.ts (separate constant to avoid a circular import; pinned by a unit test). - `lc-render` is hidden when fallback shows so the empty padded slot doesn't sit above the mammoth content. Tests: existing CDN-path tests updated for the new `wordDocToHtmlViaCdn(buffer, mammothBody)` signature; new test for the embedded fallback structure (`#lc-fallback`, mammoth body content, "High-fidelity renderer unavailable" notice, render-slot hide); new constant pin and per-fixture cap-respect assertion. * 🧪 feat: LibreOffice → PDF preview path (POC, opt-in via env) Per the plan-mode discussion: prove out a LibreOffice subprocess pipeline as an alternative to the docx-preview / pptx-preview CDN renderers. LibreOffice handles every office format Microsoft and LibreOffice itself can open (DOCX, PPTX, XLSX, ODT, ODP, ODS, RTF, many more), produces a PDF, and the host browser's built-in PDF viewer renders it inside the Sandpack iframe via a `data:` URI. No client-side JS dependency, no CDN dependency, true high fidelity for any feature LibreOffice supports. Off by default. Operators opt in by setting both: - `OFFICE_PREVIEW_LIBREOFFICE=true` - LibreOffice (`soffice` or `libreoffice`) on the server's `$PATH` When either is missing, the dispatcher falls through to the existing CDN/mammoth/slide-list pipeline so a misconfiguration doesn't break previews. Hardening (`packages/api/src/files/documents/libreoffice.ts`): - Fresh subprocess per call with isolated temp dir, stripped env (PATH/HOME/TMPDIR only), and `-env:UserInstallation` so concurrent conversions can't collide on shared `~/.config/libreoffice` locks - 30-second wall-time cap; SIGKILL on timeout - 50 MB PDF output cap to bound disk pressure - 512 KB output cap on the wrapped HTML so the SSE/cache contract stays intact (base64 inflates ~33%, effective PDF cap ~380 KB) - Macros disabled by default flags (`--norestore --invisible --nodefault --nofirststartwizard --nolockcheck`) - Tag-distinct `LibreOfficeUnavailableError` / `LibreOfficeConversionError` so callers can swallow appropriately Iframe wrapper (`buildPdfEmbedDocument`): - Native browser PDF viewer via `<iframe src="data:application/pdf; base64,...">` — works in Chrome, Edge, Safari, Firefox - CSP locks the iframe to `default-src 'none'; frame-src data:; connect-src 'none'; script-src 'unsafe-inline'` — no outbound network, no eval, no external scripts - `#view=FitH` for first-paint sizing - 4-second heuristic timer that swaps to a "Preview unavailable" fallback when the browser's PDF viewer is disabled (kiosk mode, Brave Shields, etc.) Wired into `wordDocToHtml` and `pptxToHtml` as the first branch — returns null when disabled / unavailable / oversized so the existing pipeline takes over. XLSX intentionally NOT routed through this path: SheetJS's HTML output is already excellent for spreadsheets (sortable, sticky headers) and PDF rendering of sheets is awkward. Tests (`libreoffice.spec.ts`, 30 cases — 25 always run, 5 conditional on the binary): env-gating parser semantics matching `OFFICE_PREVIEW_DISABLE_CDN`, fallthrough contract (never throws, returns null on any failure), CSP lock-down, fallback structure, binary probe caching + missing-binary path, error tagging, and integration tests that engage when `soffice`/`libreoffice` is on PATH (DOCX→PDF, PPTX→PDF, output-cap fallthrough). Integration tests skip cleanly on bare CI. * 🩹 fix: CI — preserve legacy download path for empty-text office attachments Two regressions surfaced after the textFormat security gate landed. 1. **Client** (`LogContent.test.tsx` "falls back to the legacy download branch for an office file with no extracted text"): When the security gate downgraded an office type without `textFormat: 'html'` to PLAIN_TEXT, the lenient empty-text gate on PLAIN_TEXT then accepted a missing `text` field and rendered a half-empty panel card. The historical contract is "office type + no text → legacy download UI"; the downgrade should only fire when there's actual plain text that needs safe-escaping. Fix in `detectArtifactTypeFromFile`: short-circuit to null when the office type lands in the security-gate branch with no text. The PLAIN_TEXT downgrade still fires for legacy attachments that DO carry plain text. 2. **API** (`process.spec.js` + `process-traversal.spec.js`): the `@librechat/api` mocks didn't expose `getExtractedTextFormat`, so `processCodeOutput` called `undefined(...)` → TypeError → tests got undefined results. Added the helper to both mocks with a faithful default (returns 'text' for non-null extractor output, null otherwise). Tests: new regression in `artifacts.test.ts` pinning the empty-text + no-textFormat → null contract for all four office types (.docx/.csv/.xlsx/.pptx), so a future refactor can't silently re-introduce the half-empty card. * 🩹 fix: PPTX slides scale to fit panel width (no horizontal scroll) Manual e2e on PR #12934: pptx-preview rendered slides at their native init dimensions (960×540 default). The artifact panel is much narrower than that, so the iframe got a horizontal scrollbar and only a corner of each slide showed at any time — the user had to drag-scroll across each slide to read it. Fix: keep pptx-preview's init at 960×540 so its internal layout math stays correct, then post-process each rendered slide: - Cache the slide's native width/height on its dataset BEFORE applying any transform (so subsequent re-fits don't measure the already-transformed box). - Wrap the slide in `.lc-slide-wrap` with explicit width/height set inline to the scaled dimensions; the wrap shrinks the layout space the slide occupies. - Apply `transform: scale(panel_width / 960)` to the slide itself with `transform-origin: top left` so the rendered output shrinks from the top-left corner into the wrap. - Cap the scale at 1.0 so small slides don't upscale and get blurry. Streaming + resize: - `MutationObserver` watches the container for slide insertions so streaming renders get scaled on arrival rather than waiting for the entire `previewer.preview` promise to settle. - `ResizeObserver` re-fits all wrapped slides when the iframe resizes (panel drag, window resize). Tests: new "bootstrap wraps + scales each slide" lock in the wrap class, scale computation, observer setup, and native-size caching so a future refactor can't silently re-introduce the overflow. * 🩹 fix: PPTX wrap+scale runs after preview, not during streaming Manual e2e on PR #12934: regenerated PPTX showed "Preview unavailable" in the iframe. Root cause: the MutationObserver I added in the previous commit fired during pptx-preview's render and moved slides out from under the library's references. pptx-preview's async pipeline raised an unhandled rejection, the iframe's window-level listener caught it, and the fallback message replaced the partial render. Fix: drop the MutationObserver. Apply the wrap+scale ONCE in a `finalize` step that runs: - On `previewer.preview().then` (the happy path) - On the 8-second timeout safety net IF the container has children (silent-failure path — pptx-preview emitted slides but never resolved its outer promise) To prevent the user from seeing an unscaled flash while pptx-preview renders into the 960px-wide canvas, the container is set to `visibility: hidden` at init and only revealed inside `finalize` after wrap+scale completes. Resize handling stays via `ResizeObserver` on `document.body`, installed AFTER the wrap pass so it doesn't fire during the wrap itself. Tests: regression assertion now also locks in: - `container.style.visibility = 'hidden' / 'visible'` (the flash- prevention contract) - Absence of MutationObserver (the bug we just removed — must NOT creep back in via a future "let's scale during streaming" idea) * 🩹 fix: PPTX slides fill panel width (drop upscale cap, per-slide scale) Manual e2e on PR #12934: slides rendered correctly but didn't fill the artifact panel — whitespace on either side. Two issues: 1. The scale was capped at `Math.min(1, available / SLIDE_W)`. On panels wider than 960px, the cap clamped the scale to 1.0 and slides rendered at native size with whitespace on the sides instead of stretching. 2. The scale was computed against the constant `SLIDE_W = 960`, but pptx-preview can emit slides whose `offsetWidth` differs from the init param if the source PPTX has a non-16:9 layout. Per-slide division of `available / nativeW` handles that case. Fix: replace `computeScale()` with two helpers — `availableWidth()` returns the panel content-box width and `scaleFor(nativeW)` returns the per-slide scale. No upscale cap. The slide content is rendered by pptx-preview against its 960×540 canvas using vector text / canvas — scaling up to e.g. 1500px doesn't visibly degrade quality. Tests: regression now also asserts: - `availableWidth()` and `scaleFor()` exist by name - The exact scale formula `availableWidth() / (nativeW || SLIDE_W)` - Negative assertion that `Math.min(1, ...)` is NOT present, so a future "let's add an upscale cap" rewrite can't silently re-introduce the whitespace. * 🩹 fix: PPTX preview fills panel height (no white gap below slides) Manual e2e on PR #12934: PPTX preview filled the panel width but left empty space below the last slide. DOCX didn't have this issue because its content (mammoth-rendered HTML) flows naturally and either fits exactly or overflows; PPTX slides are fixed-aspect 16:9 and don't grow with the panel. Two changes: 1. **Body fills the iframe viewport** — `html, body { min-height: 100vh }` plus `body { display: flex; flex-direction: column }` and `#lc-render { flex: 1 0 auto }`. The dark theme bg now fills the iframe even when total slide content is shorter than the panel, so a single-slide deck never reveals a "white below" gap. 2. **Per-slide scale honors viewport height** — `scaleFor(nativeW, nativeH)` now returns `min(width-fit, height-fit)` (largest factor that fits without overflowing either dimension). On a tall artifact panel with a short deck, slides grow up to the full panel height instead of staying at the width-bound size. Existing height-fit was always considered correct conceptually but the previous implementation only used width-fit, leaving half the viewport unused per slide. Tests: regression now also asserts `availableHeight()`, the `Math.min(sw, sh)` formula, and `min-height: 100vh` are in the bootstrap. Negative assertion for the old `Math.min(1, ...)` upscale cap remains. * 🩹 fix: revert body flex on PPTX bootstrap (caused black-screen render) Manual e2e regression on PR #12934: the previous commit added `body { display: flex; flex-direction: column }` plus `#lc-render { flex: 1 0 auto }` to fill the panel height. Side effect: pptx-preview's internal layout assumes block flow on its ancestor elements; making body a flex container caused slides to render as solid-black rectangles (sized correctly, but with no visible content inside). Fix: keep just `html, body { min-height: 100vh }` for the bg-fill effect — that alone gives empty space below short decks the dark theme bg without changing flow. Drop the body-flex and the `#lc-render { flex: 1 0 auto }` directives. The height-aware `scaleFor(nativeW, nativeH)` from the same commit stays — it doesn't interact with pptx-preview's layout, just chooses a per-slide scale. Each slide still grows to fit the viewport contain-style. Negative-assertion added to the regression test: `body { display: flex }` must NOT appear in the bootstrap, so a future "let's flex the body to make height work" rewrite can't silently re-introduce this. (Note: the user also flagged DOCX theming as faint body text; I'm leaving that for now per their note that it may be pre-existing. Not addressed in this commit.) * 🩹 fix: revert PPTX height-fill changes; lock DOCX CDN to light scheme Two fixes for separate manual e2e regressions on PR #12934. **1. PPTX black screen (single slide rendering as solid black).** The previous fix removed `body { display: flex }` thinking that was the sole cause, but the regression persisted. Bisecting against the last known-good commit ( |
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