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spike: replace sharp with pure-JS image ops (jimp + jsquash WASM)

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Removes the last native dependency from the ingest path, so the server no longer
needs a per-platform/per-ABI prebuilt to thumbnail an image. Motivated by getting
the server onto hardware with no toolchain, but the ABI tax is paid on every
install — it is the same failure class lib/preflight-deps.js exists to explain.

lib/image-ops.js is the whole surface: metadata() and writeThumbnail(), which are
the only two things ingest ever asked sharp for.

Format parity holds. jpeg/png/gif/tiff/bmp are native to Jimp; webp and avif go
through @jsquash WASM, whose bundled .wasm must be compiled by hand because the
packages locate it with fetch(file://) and Node has no file:// fetch — the only
symptom otherwise is a bare "fetch failed". heic is unsupported, as it already
was: sharp advertises heif but its prebuilt libvips refuses HEVC.

#170 is preserved by a different mechanism. Jimp applies EXIF orientation at
decode and rewrites the tag to 1, so metadata() reports display dimensions and
imageDisplayDims() runs as a no-op instead of swapping W/H a second time. The
helper stays in the path so the rule keeps living in one place.

Verified: 1643/1643 tests pass, and ingest was exercised in a child process with
node_modules/sharp moved aside — jpeg, EXIF-rotated jpeg, png, webp, avif, gif
all measured and thumbnailed correctly, corrupt input still yields nulls with no
phantom thumbnail_path.

KNOWN BLOCKER, do not ship as-is: Jimp is pure JS on the main thread, where sharp
handed work to a libvips threadpool. A 12MP photo goes 65ms -> 1079ms, and the
event loop stalls for 1003ms of it (sharp: zero stalls). thumbnail-backfill.js
walks a whole library at boot, so this reproduces #240 exactly — blocked loop,
missed heartbeats, panels marked offline, reconnect churn. Needs a worker_thread
offload before this is viable; image-ops.js is the seam for it.
This commit is contained in:
ScreenTinker 2026-08-13 11:09:59 -05:00
parent aa09631d69
commit 260a0ca4b8
5 changed files with 918 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
server/lib/content-ingest.js
View file

@ -31,7 +31,7 @@ function safeFilename(name) {
* orientation bug (#170) that the ingest path fixes with imageDisplayDims + .rotate(). A second
* copy of this logic is a second place for it to rot; there is now one.
*
* Best-effort by contract: a missing ffprobe or a sharp failure yields nulls and a warning, never
* Best-effort by contract: a missing ffprobe or a decode failure yields nulls and a warning, never
* a throw — the file itself is already stored and is worth more than its metadata.
*
* @returns {{width:number|null, height:number|null, durationSec:number|null, thumbnailPath:string|null}}
@ -39,24 +39,24 @@ function safeFilename(name) {
async function deriveMediaMetadata(sourcePath, filepath, mime) {
let width = null, height = null, durationSec = null, thumbnailPath = null;
try {
// SVG is deliberately NOT handed to sharp: rasterising it goes through librsvg, which
// is where the outstanding libvips CVEs live, and an SVG is already its own thumbnail.
// SVG is deliberately NOT rasterised: it is already its own thumbnail. (It also used to be
// the one format kept away from sharp, because rasterising went through librsvg — where the
// outstanding libvips CVEs live. Nothing rasterises it now either.)
if (mime === 'image/svg+xml') {
thumbnailPath = filepath;
} else if (mime.startsWith('image/')) {
const sharp = require('sharp');
const metadata = await sharp(sourcePath).metadata();
// #170: honor EXIF orientation so a portrait photo isn't stored as landscape.
const imageOps = require('./image-ops');
const metadata = await imageOps.metadata(sourcePath);
// #170: honor EXIF orientation so a portrait photo isn't stored as landscape. The decoder
// applies it and reports orientation 1, so this is a no-op pass-through today — kept so the
// rule lives in one place regardless of which decoder is underneath.
({ width, height } = imageDisplayDims(metadata));
// Assign thumbnailPath only AFTER the write succeeds: a sharp failure used to
// Assign thumbnailPath only AFTER the write succeeds: a decode failure used to
// return the already-assigned name for a file that was never written, storing a
// phantom thumbnail_path that the UI then requests forever as a broken image.
const thumbName = `thumb_${filepath}`;
await sharp(sourcePath)
.rotate() // #170: auto-orient per EXIF (and strip the tag) so the thumbnail matches
.resize(config.thumbnailWidth)
.jpeg({ quality: 70 })
.toFile(path.join(config.contentDir, thumbName));
// #170: rotation is implicit — the decode already auto-oriented, so the thumbnail matches.
await imageOps.writeThumbnail(sourcePath, path.join(config.contentDir, thumbName), config.thumbnailWidth, 70);
thumbnailPath = thumbName;
} else if (mime.startsWith('video/')) {
try {

106
server/lib/image-ops.js Normal file
View file

@ -0,0 +1,106 @@
'use strict';
/*
* Pure-JavaScript image operations — the two things the ingest path ever asked sharp for:
* measure an image, and write a thumbnail.
*
* WHY NOT SHARP: sharp is a native module wrapping libvips. That costs us a prebuilt binary per
* platform/ABI, and when there isn't one (or Node moves ABI) the failure is
* ERR_DLOPEN_FAILED/NODE_MODULE_VERSION at require time — the same class of breakage
* lib/preflight-deps.js exists to explain for better-sqlite3. Nothing in here is native, so the
* server runs anywhere Node runs, including the embedded targets that have no toolchain.
*
* FORMAT COVERAGE vs the sharp it replaces:
* jpeg png gif tiff bmp Jimp, natively
* webp avif @jsquash/* — WebAssembly, bundled, no network (see wasmDecode below)
* svg never reaches here; callers thumbnail an SVG with itself
* heic unsupported — and it already was. sharp lists `heif`, but its
* prebuilt libvips has AV1 only and refuses HEVC ("Unsupported
* compression"), so .heic uploads have never produced a thumbnail.
*
* ORIENTATION (#170): Jimp applies EXIF orientation when it decodes and rewrites the tag to 1,
* so what comes back is already DISPLAY dimensions — the rotation sharp needed an explicit
* .rotate() for. metadata() therefore reports orientation 1 and lets imageDisplayDims() run as a
* no-op rather than swapping W/H a second time. Report the tag honestly and that helper stays
* correct for any future decoder that does NOT auto-orient.
*/
const path = require('path');
const fs = require('fs');
const { sniffMime } = require('./upload-sniff');
// Jimp is ESM-first but ships a CJS entry; require() is fine and keeps this file loadable from
// the CommonJS server. Deferred so a caller that never touches an image never pays for it.
let _jimp = null;
function jimp() {
if (!_jimp) _jimp = require('jimp');
return _jimp;
}
/*
* @jsquash's decoders are browser-first: they locate their .wasm with
* `fetch(new URL('...wasm', import.meta.url))`. Under Node that URL is a file:// one and Node's
* fetch does not implement file://, so the bundled binary never loads and the only symptom is a
* bare "fetch failed". The binary IS on disk in the package — read and compile it ourselves, then
* hand the Module to init(). No network, at install time or after.
*/
const WASM_CODECS = {
'image/webp': { pkg: '@jsquash/webp', wasm: '@jsquash/webp/codec/dec/webp_dec.wasm' },
'image/avif': { pkg: '@jsquash/avif', wasm: '@jsquash/avif/codec/dec/avif_dec.wasm' },
};
const decoderCache = new Map();
async function wasmDecode(mime, buf) {
const spec = WASM_CODECS[mime];
if (!spec) return null;
if (!decoderCache.has(mime)) {
decoderCache.set(mime, (async () => {
const mod = await import(`${spec.pkg}/decode.js`);
await mod.init(await WebAssembly.compile(fs.readFileSync(require.resolve(spec.wasm))));
return mod.default;
})());
}
const decode = await decoderCache.get(mime);
return decode(buf); // -> ImageData-ish { data, width, height }
}
/*
* Decode to a Jimp image whatever the format. Reuses sniffMime rather than carrying a second copy
* of the magic-byte table — routes/media.js already duplicating it once is noted there as a smell.
* Throws on anything undecodable, which is the contract callers already handle (a failure yields
* null metadata and no thumbnail, never a lost upload).
*/
async function readImage(src) {
const buf = await fs.promises.readFile(src);
const mime = sniffMime(buf);
if (WASM_CODECS[mime]) {
const raw = await wasmDecode(mime, buf);
if (!raw) throw new Error(`no decoder for ${mime}`);
return jimp().Jimp.fromBitmap({ data: Buffer.from(raw.data), width: raw.width, height: raw.height });
}
return jimp().Jimp.read(buf);
}
/*
* Display dimensions, shaped like the sharp metadata the callers already destructure.
* orientation is 1 because the decode above already applied it — see ORIENTATION note at the top.
*/
async function metadata(src) {
const img = await readImage(src);
return { width: img.bitmap.width, height: img.bitmap.height, orientation: 1 };
}
/*
* Write a JPEG thumbnail `width` px wide, aspect preserved — sharp's
* .rotate().resize(width).jpeg({quality}).toFile(). Rotation is implicit in the decode.
* Never upscales: sharp's resize() would enlarge a small source, but a thumbnail bigger than its
* original is pure waste, and the callers only ever shrink.
*/
async function writeThumbnail(src, destPath, width, quality = 70) {
const img = await readImage(src);
if (img.bitmap.width > width) img.resize({ w: width });
await fs.promises.writeFile(destPath, await img.getBuffer('image/jpeg', { quality }));
}
module.exports = { metadata, writeThumbnail, readImage };

792
server/package-lock.json generated
View file

@ -9,6 +9,8 @@
"version": "1.9.34-alpha6",
"dependencies": {
"@azure/msal-node": "^5.2.1",
"@jsquash/avif": "^1.3.0",
"@jsquash/webp": "^1.5.0",
"archiver": "^7.0.1",
"bcryptjs": "^3.0.3",
"better-sqlite3": "^9.4.3",
@ -16,6 +18,7 @@
"express": "^4.18.2",
"express-rate-limit": "^8.3.1",
"helmet": "^8.1.0",
"jimp": "^1.6.1",
"jsonwebtoken": "^9.0.3",
"multer": "^1.4.5-lts.1",
"nodemailer": "^6.9.16",
@ -55,6 +58,16 @@
"node": ">=20"
}
},
"node_modules/@borewit/text-codec": {
"version": "0.2.2",
"resolved": "https://registry.npmjs.org/@borewit/text-codec/-/text-codec-0.2.2.tgz",
"integrity": "sha512-DDaRehssg1aNrH4+2hnj1B7vnUGEjU6OIlyRdkMd0aUdIUvKXrJfXsy8LVtXAy7DRvYVluWbMspsRhz2lcW0mQ==",
"license": "MIT",
"funding": {
"type": "github",
"url": "https://github.com/sponsors/Borewit"
}
},
"node_modules/@emnapi/runtime": {
"version": "1.11.3",
"resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.11.3.tgz",
@ -582,6 +595,457 @@
"node": ">=12"
}
},
"node_modules/@jimp/core": {
"version": "1.6.1",
"resolved": "https://registry.npmjs.org/@jimp/core/-/core-1.6.1.tgz",
"integrity": "sha512-+BoKC5G6hkrSy501zcJ2EpfnllP+avPevcBfRcZe/CW+EwEfY6X1EZ8QWyT7NpDIvEEJb1fdJnMMfUnFkxmw9A==",
"license": "MIT",
"dependencies": {
"@jimp/file-ops": "1.6.1",
"@jimp/types": "1.6.1",
"@jimp/utils": "1.6.1",
"await-to-js": "^3.0.0",
"exif-parser": "^0.1.12",
"file-type": "^21.3.3",
"mime": "3"
},
"engines": {
"node": ">=18"
}
},
"node_modules/@jimp/core/node_modules/mime": {
"version": "3.0.0",
"resolved": "https://registry.npmjs.org/mime/-/mime-3.0.0.tgz",
"integrity": "sha512-jSCU7/VB1loIWBZe14aEYHU/+1UMEHoaO7qxCOVJOw9GgH72VAWppxNcjU+x9a2k3GSIBXNKxXQFqRvvZ7vr3A==",
"license": "MIT",
"bin": {
"mime": "cli.js"
},
"engines": {
"node": ">=10.0.0"
}
},
"node_modules/@jimp/diff": {
"version": "1.6.1",
"resolved": "https://registry.npmjs.org/@jimp/diff/-/diff-1.6.1.tgz",
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"node_modules/pngjs": {
"version": "5.0.0",
"resolved": "https://registry.npmjs.org/pngjs/-/pngjs-5.0.0.tgz",
@ -3831,6 +4509,15 @@
"integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
"license": "MIT"
},
"node_modules/sax": {
"version": "1.6.1",
"resolved": "https://registry.npmjs.org/sax/-/sax-1.6.1.tgz",
"integrity": "sha512-42tBVwLWnaQvW5zc4HbZrTuWccECCZfBi92FDuwtqxasH+JbPB3/FOKb1m222K42R4WxuxzzMsTswfzgtSu64Q==",
"license": "BlueOak-1.0.0",
"engines": {
"node": ">=11.0.0"
}
},
"node_modules/semver": {
"version": "7.8.5",
"resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
@ -4099,6 +4786,15 @@
"simple-concat": "^1.0.0"
}
},
"node_modules/simple-xml-to-json": {
"version": "1.2.7",
"resolved": "https://registry.npmjs.org/simple-xml-to-json/-/simple-xml-to-json-1.2.7.tgz",
"integrity": "sha512-mz9VXphOxQWX3eQ/uXCtm6upltoN0DLx8Zb5T4TFC4FHB7S9FDPGre8CfLWqPWQQH/GrQYd2AXhhVM5LDpYx6Q==",
"license": "MIT",
"engines": {
"node": ">=20.12.2"
}
},
"node_modules/smart-buffer": {
"version": "4.2.0",
"resolved": "https://registry.npmjs.org/smart-buffer/-/smart-buffer-4.2.0.tgz",
@ -4492,6 +5188,22 @@
}
}
},
"node_modules/strtok3": {
"version": "10.3.5",
"resolved": "https://registry.npmjs.org/strtok3/-/strtok3-10.3.5.tgz",
"integrity": "sha512-ki4hZQfh5rX0QDLLkOCj+h+CVNkqmp/CMf8v8kZpkNVK6jGQooMytqzLZYUVYIZcFZ6yDB70EfD8POcFXiF5oA==",
"license": "MIT",
"dependencies": {
"@tokenizer/token": "^0.3.0"
},
"engines": {
"node": ">=18"
},
"funding": {
"type": "github",
"url": "https://github.com/sponsors/Borewit"
}
},
"node_modules/tar-fs": {
"version": "2.1.4",
"resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.1.4.tgz",
@ -4560,6 +5272,12 @@
"node": ">=0.2.6"
}
},
"node_modules/tinycolor2": {
"version": "1.6.0",
"resolved": "https://registry.npmjs.org/tinycolor2/-/tinycolor2-1.6.0.tgz",
"integrity": "sha512-XPaBkWQJdsf3pLKJV9p4qN/S+fm2Oj8AIPo1BTUhg5oxkvm9+SVEGFdhyOz7tTdUTfvxMiAs4sp6/eZO2Ew+pw==",
"license": "MIT"
},
"node_modules/toidentifier": {
"version": "1.0.1",
"resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
@ -4569,6 +5287,24 @@
"node": ">=0.6"
}
},
"node_modules/token-types": {
"version": "6.1.2",
"resolved": "https://registry.npmjs.org/token-types/-/token-types-6.1.2.tgz",
"integrity": "sha512-dRXchy+C0IgK8WPC6xvCHFRIWYUbqqdEIKPaKo/AcTUNzwLTK6AH7RjdLWsEZcAN/TBdtfUw3PYEgPr5VPr6ww==",
"license": "MIT",
"dependencies": {
"@borewit/text-codec": "^0.2.1",
"@tokenizer/token": "^0.3.0",
"ieee754": "^1.2.1"
},
"engines": {
"node": ">=14.16"
},
"funding": {
"type": "github",
"url": "https://github.com/sponsors/Borewit"
}
},
"node_modules/tslib": {
"version": "2.8.1",
"resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@ -4614,6 +5350,18 @@
"integrity": "sha512-/aCDEGatGvZ2BIk+HmLf4ifCJFwvKFNb9/JeZPMulfgFracn9QFcAf5GO8B/mweUjSoblS5In0cWhqpfs/5PQA==",
"license": "MIT"
},
"node_modules/uint8array-extras": {
"version": "1.5.0",
"resolved": "https://registry.npmjs.org/uint8array-extras/-/uint8array-extras-1.5.0.tgz",
"integrity": "sha512-rvKSBiC5zqCCiDZ9kAOszZcDvdAHwwIKJG33Ykj43OKcWsnmcBRL09YTU4nOeHZ8Y2a7l1MgTd08SBe9A8Qj6A==",
"license": "MIT",
"engines": {
"node": ">=18"
},
"funding": {
"url": "https://github.com/sponsors/sindresorhus"
}
},
"node_modules/undici-types": {
"version": "7.18.2",
"resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
@ -4651,6 +5399,15 @@
"node-int64": "^0.4.0"
}
},
"node_modules/utif2": {
"version": "4.1.0",
"resolved": "https://registry.npmjs.org/utif2/-/utif2-4.1.0.tgz",
"integrity": "sha512-+oknB9FHrJ7oW7A2WZYajOcv4FcDR4CfoGB0dPNfxbi4GO05RRnFmt5oa23+9w32EanrYcSJWspUiJkLMs+37w==",
"license": "MIT",
"dependencies": {
"pako": "^1.0.11"
}
},
"node_modules/util-deprecate": {
"version": "1.0.2",
"resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@ -4688,6 +5445,12 @@
"node": ">= 0.8"
}
},
"node_modules/wasm-feature-detect": {
"version": "1.9.0",
"resolved": "https://registry.npmjs.org/wasm-feature-detect/-/wasm-feature-detect-1.9.0.tgz",
"integrity": "sha512-zonE+xlIIYtxPy++L24ow0hAD8CICb4+FgPyROd3buyXIqsJvUEDkBgfCCoXOd1Hu3DUr0GOfnPIdcGV+YpNaA==",
"license": "Apache-2.0"
},
"node_modules/webdriver-bidi-protocol": {
"version": "0.4.1",
"resolved": "https://registry.npmjs.org/webdriver-bidi-protocol/-/webdriver-bidi-protocol-0.4.1.tgz",
@ -4834,6 +5597,34 @@
}
}
},
"node_modules/xml-parse-from-string": {
"version": "1.0.1",
"resolved": "https://registry.npmjs.org/xml-parse-from-string/-/xml-parse-from-string-1.0.1.tgz",
"integrity": "sha512-ErcKwJTF54uRzzNMXq2X5sMIy88zJvfN2DmdoQvy7PAFJ+tPRU6ydWuOKNMyfmOjdyBQTFREi60s0Y0SyI0G0g==",
"license": "MIT"
},
"node_modules/xml2js": {
"version": "0.5.0",
"resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.5.0.tgz",
"integrity": "sha512-drPFnkQJik/O+uPKpqSgr22mpuFHqKdbS835iAQrUC73L2F5WkboIRd63ai/2Yg6I1jzifPFKH2NTK+cfglkIA==",
"license": "MIT",
"dependencies": {
"sax": ">=0.6.0",
"xmlbuilder": "~11.0.0"
},
"engines": {
"node": ">=4.0.0"
}
},
"node_modules/xmlbuilder": {
"version": "11.0.1",
"resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-11.0.1.tgz",
"integrity": "sha512-fDlsI/kFEx7gLvbecc0/ohLG50fugQp8ryHzMTuW9vSa1GJ0XYWKnhsUx7oie3G98+r56aTQIUB4kht42R3JvA==",
"license": "MIT",
"engines": {
"node": ">=4.0"
}
},
"node_modules/xmlhttprequest-ssl": {
"version": "2.1.2",
"resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-2.1.2.tgz",
@ -5022,7 +5813,6 @@
"version": "3.25.76",
"resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
"integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
"dev": true,
"license": "MIT",
"funding": {
"url": "https://github.com/sponsors/colinhacks"

5
server/package.json
View file

@ -11,6 +11,8 @@
},
"dependencies": {
"@azure/msal-node": "^5.2.1",
"@jsquash/avif": "^1.3.0",
"@jsquash/webp": "^1.5.0",
"archiver": "^7.0.1",
"bcryptjs": "^3.0.3",
"better-sqlite3": "^9.4.3",
@ -18,12 +20,12 @@
"express": "^4.18.2",
"express-rate-limit": "^8.3.1",
"helmet": "^8.1.0",
"jimp": "^1.6.1",
"jsonwebtoken": "^9.0.3",
"multer": "^1.4.5-lts.1",
"nodemailer": "^6.9.16",
"otplib": "^12.0.1",
"qrcode": "^1.5.4",
"sharp": "^0.35.3",
"socket.io": "^4.7.2",
"stripe": "^20.4.1",
"unzipper": "^0.12.3",
@ -32,6 +34,7 @@
"devDependencies": {
"js-yaml": "^4.2.0",
"puppeteer-core": "^24.43.1",
"sharp": "^0.35.3",
"socket.io-client": "^4.8.3"
}
}

9
server/scripts/backfill-rotation-dims.js
View file

@ -31,13 +31,14 @@ function probeVideoDims(filePath) {
}
async function probeImageDims(filePath) {
const sharp = require('sharp');
return imageDisplayDims(await sharp(filePath).metadata());
const imageOps = require('../lib/image-ops');
return imageDisplayDims(await imageOps.metadata(filePath));
}
async function regenImageThumb(filePath, thumbName) {
const sharp = require('sharp');
await sharp(filePath).rotate().resize(config.thumbnailWidth).jpeg({ quality: 70 }).toFile(path.join(config.contentDir, thumbName));
const imageOps = require('../lib/image-ops');
// Rotation is implicit: the decoder auto-orients per EXIF, which is what .rotate() bought here.
await imageOps.writeThumbnail(filePath, path.join(config.contentDir, thumbName), config.thumbnailWidth, 70);
}
(async () => {