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Update server.js

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This commit is contained in:
Matthew Jackson
2026-01-22 08:16:56 -08:00
committed by GitHub
parent 89076e590f
commit f4fd09873c
1 changed files with 159 additions and 36 deletions
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193
server.js
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@@ -2,7 +2,6 @@ import express from "express";
import sharp from "sharp";
import { execFile } from "child_process";
import fs from "fs/promises";
import { createReadStream } from "fs";
import path from "path";
import { randomUUID } from "crypto";
import archiver from "archiver";
@@ -17,13 +16,62 @@ app.use(express.raw({ type: "*/*", limit: "30mb" }));
app.get("/", (_req, res) => res.status(200).send("postconvert: ok"));
app.get("/health", (_req, res) => res.status(200).send("ok"));
// ---------------- Request context / logging ----------------
const DEFAULT_REQ_TIMEOUT_MS = clampInt(process.env.REQ_TIMEOUT_MS, 5_000, 10 * 60_000, 120_000);
app.use((req, res, next) => {
const requestId = String(req.headers["x-request-id"] || "").trim() || randomUUID();
req.requestId = requestId;
res.setHeader("x-request-id", requestId);
const started = Date.now();
req.setTimeout(DEFAULT_REQ_TIMEOUT_MS);
res.setTimeout(DEFAULT_REQ_TIMEOUT_MS);
res.on("finish", () => {
const ms = Date.now() - started;
const len = Number(req.headers["content-length"] || 0) || (req.body?.length ?? 0) || 0;
console.log(
JSON.stringify({
requestId,
method: req.method,
path: req.originalUrl,
status: res.statusCode,
contentType: req.headers["content-type"] || null,
bytesIn: len,
ms,
})
);
});
next();
});
function isAborted(req, res) {
return Boolean(req.aborted || res.writableEnded || res.destroyed);
}
function sendError(res, status, code, message, requestId) {
if (res.headersSent) {
try {
res.end();
} catch {}
return;
}
res.status(status);
res.setHeader("Content-Type", "application/json; charset=utf-8");
res.send(JSON.stringify({ error: code, message, requestId }));
}
// ---------------- Auth ----------------
function requireAuth(req, res) {
const token = process.env.CONVERTER_TOKEN;
const auth = req.headers.authorization || "";
if (!token || auth !== `Bearer ${token}`) {
res.status(401).send("Unauthorized");
sendError(res, 401, "unauthorized", "Unauthorized", req.requestId);
return false;
}
return true;
@@ -54,10 +102,25 @@ function looksLikeHeic(buf) {
brands.includes("hevx") ||
brands.includes("mif1") ||
brands.includes("msf1")
// If you want to treat AVIF similarly, add: || brands.includes("avif")
);
}
async function assertSupportedRasterImage(input, req) {
// If it’s HEIC/HEIF, sharp may fail metadata; allow it through to WASM path.
if (looksLikeHeic(input)) return;
// Quick probe: if sharp can’t read metadata, treat it as unsupported (415).
try {
await sharp(input, { failOnError: false }).metadata();
} catch {
const ct = String(req.headers["content-type"] || "unknown");
throw Object.assign(new Error(`Unsupported input (not a decodable image). content-type=${ct}`), {
statusCode: 415,
code: "unsupported_media_type",
});
}
}
// ---------------- Resize / Quality options ----------------
// Headers:
// - x-jpeg-quality: 0..100 (default 100)
@@ -66,6 +129,10 @@ function looksLikeHeic(buf) {
// - x-height: px (optional)
// - x-fit: inside|cover|contain|fill|outside (default inside)
// - x-without-enlargement: true|false (default true)
//
// PDF headers:
// - x-pdf-dpi: 72..600 (default 300)
// - x-pdf-max-pages: 1..200 (default 50)
function parseBool(v, fallback = false) {
if (v == null) return fallback;
@@ -84,9 +151,7 @@ function parseResizeOptions(req) {
const maxDim = clampInt(req.headers["x-max-dimension"], 1, 20000, 0) || null;
const fitRaw = String(req.headers["x-fit"] || "inside").toLowerCase();
const fit = ["inside", "cover", "contain", "fill", "outside"].includes(fitRaw)
? fitRaw
: "inside";
const fit = ["inside", "cover", "contain", "fill", "outside"].includes(fitRaw) ? fitRaw : "inside";
const withoutEnlargement = parseBool(req.headers["x-without-enlargement"], true);
@@ -113,11 +178,11 @@ function applyResizeAndJpeg(pipeline, opts) {
});
}
// JPEG encode. mozjpeg requires sharp build support; if unavailable, sharp ignores it.
return pipeline.jpeg({
quality,
chromaSubsampling: "4:4:4",
mozjpeg: true,
progressive: true,
});
}
@@ -186,19 +251,11 @@ async function pdfFirstPageToJpeg(inputBuffer, opts, dpi = 300) {
try {
await fs.writeFile(pdfPath, inputBuffer);
await execFilePromise("pdftoppm", [
"-jpeg",
"-r",
String(dpi),
"-singlefile",
pdfPath,
outPrefix,
]);
await execFilePromise("pdftoppm", ["-jpeg", "-r", String(dpi), "-singlefile", pdfPath, outPrefix]);
const pageJpg = await fs.readFile(`${outPrefix}.jpg`);
return toJpegWithSharp(pageJpg, opts);
} finally {
// best-effort cleanup
await safeUnlink(pdfPath);
await safeUnlink(`${outPrefix}.jpg`);
}
@@ -208,45 +265,70 @@ async function pdfFirstPageToJpeg(inputBuffer, opts, dpi = 300) {
// Single JPEG output (images + PDF first page)
app.post("/convert", async (req, res) => {
const requestId = req.requestId;
try {
if (!requireAuth(req, res)) return;
if (isAborted(req, res)) return;
const input = req.body;
if (!input || input.length === 0) return res.status(400).send("Empty body");
if (!input || input.length === 0) {
return sendError(res, 400, "empty_body", "Empty body", requestId);
}
const opts = parseResizeOptions(req);
// PDF: always handle via poppler
// PDF: handle via poppler
if (isPdfRequest(req)) {
const jpeg = await pdfFirstPageToJpeg(input, opts, 300);
if (isAborted(req, res)) return;
res.setHeader("Content-Type", "image/jpeg");
return res.status(200).send(jpeg);
}
// Non-PDF: validate input is a decodable raster image (or HEIC)
await assertSupportedRasterImage(input, req);
// Try sharp first (fast path)
try {
const jpeg = await toJpegWithSharp(input, opts);
if (isAborted(req, res)) return;
res.setHeader("Content-Type", "image/jpeg");
return res.status(200).send(jpeg);
} catch (sharpErr) {
// If it looks like HEIC/HEIF, decode via WASM and encode to JPEG
if (looksLikeHeic(input)) {
const jpeg = await heicToJpegWithWasm(input, opts);
if (isAborted(req, res)) return;
res.setHeader("Content-Type", "image/jpeg");
return res.status(200).send(jpeg);
}
// Otherwise: return the original sharp error
throw sharpErr;
}
} catch (e) {
console.error(e);
return res.status(500).send(String(e?.stack || e));
// Expected 415 from probe
if (e?.statusCode === 415) {
return sendError(res, 415, e.code || "unsupported_media_type", e.message, requestId);
}
console.error(JSON.stringify({ requestId, err: String(e?.stack || e) }));
// Don’t leak stack traces to clients
return sendError(res, 500, "conversion_failed", "Conversion failed", requestId);
}
});
// PDF all pages -> ZIP of JPEG pages (supports resize/quality by re-encoding each page)
app.post("/convert/pdf", async (req, res) => {
const requestId = req.requestId;
// More time for multi-page zips
req.setTimeout(clampInt(process.env.REQ_TIMEOUT_PDF_MS, 10_000, 30 * 60_000, 5 * 60_000));
res.setTimeout(clampInt(process.env.REQ_TIMEOUT_PDF_MS, 10_000, 30 * 60_000, 5 * 60_000));
let archive = null;
const id = randomUUID();
@@ -256,12 +338,15 @@ app.post("/convert/pdf", async (req, res) => {
try {
if (!requireAuth(req, res)) return;
if (isAborted(req, res)) return;
const input = req.body;
if (!input || input.length === 0) return res.status(400).send("Empty body");
if (!input || input.length === 0) {
return sendError(res, 400, "empty_body", "Empty body", requestId);
}
if (!isPdfRequest(req)) {
return res.status(415).send("This endpoint only accepts PDFs");
return sendError(res, 415, "unsupported_media_type", "This endpoint only accepts PDFs", requestId);
}
const opts = parseResizeOptions(req);
@@ -271,6 +356,8 @@ app.post("/convert/pdf", async (req, res) => {
await fs.mkdir(outDir, { recursive: true });
await fs.writeFile(pdfPath, input);
if (isAborted(req, res)) return;
// Render all pages to JPG via poppler
await execFilePromise("pdftoppm", ["-jpeg", "-r", String(dpi), pdfPath, outPrefix]);
@@ -278,9 +365,15 @@ app.post("/convert/pdf", async (req, res) => {
.filter((f) => /^page-\d+\.jpg$/i.test(f))
.sort((a, b) => pageNum(a) - pageNum(b));
if (files.length === 0) return res.status(500).send("PDF render produced no pages");
if (files.length === 0) return sendError(res, 500, "pdf_render_failed", "PDF render produced no pages", requestId);
if (files.length > maxPages) {
return res.status(413).send(`PDF has ${files.length} pages; exceeds maxPages=${maxPages}`);
return sendError(
res,
413,
"pdf_too_many_pages",
`PDF has ${files.length} pages; exceeds maxPages=${maxPages}`,
requestId
);
}
res.status(200);
@@ -302,15 +395,19 @@ app.post("/convert/pdf", async (req, res) => {
});
archive.on("error", (err) => {
console.error(err);
if (!res.headersSent) res.status(500);
res.end();
console.error(JSON.stringify({ requestId, err: String(err?.stack || err) }));
try {
if (!res.headersSent) sendError(res, 500, "zip_failed", "ZIP creation failed", requestId);
else res.end();
} catch {}
});
archive.pipe(res);
// Re-encode each rendered page with resize + quality controls, then append as buffers
for (let i = 0; i < files.length; i++) {
if (isAborted(req, res)) break;
const f = files[i];
const n = String(i + 1).padStart(3, "0");
const pagePath = path.join(outDir, f);
@@ -318,24 +415,43 @@ app.post("/convert/pdf", async (req, res) => {
const pageBuf = await fs.readFile(pagePath);
const jpegBuf = await toJpegWithSharp(pageBuf, opts);
if (isAborted(req, res)) break;
archive.append(jpegBuf, { name: `${n}.jpg` });
}
if (!isAborted(req, res)) {
await archive.finalize();
}
} catch (e) {
console.error(e);
return res.status(500).send(String(e?.stack || e));
console.error(JSON.stringify({ requestId, err: String(e?.stack || e) }));
// If we already started streaming a zip, we can’t reliably send JSON.
if (res.headersSent) {
try {
res.end();
} catch {}
return;
}
// ENOENT (pdftoppm missing) or other exec failures should be clear, but still not leak stack.
const msg =
String(e?.message || "").includes("Missing dependency: pdftoppm") ||
String(e?.message || "").includes("ENOENT")
? "Server missing PDF rendering dependency"
: "Conversion failed";
return sendError(res, 500, "conversion_failed", msg, requestId);
} finally {
// Best-effort cleanup for PDF zip path
await safeUnlink(pdfPath);
await safeRmrf(outDir);
}
});
// Oversize handler
app.use((err, _req, res, next) => {
app.use((err, req, res, next) => {
if (err?.type === "entity.too.large") {
return res.status(413).send("Payload too large (max 30mb)");
return sendError(res, 413, "payload_too_large", "Payload too large (max 30mb)", req.requestId);
}
return next(err);
});
@@ -350,7 +466,14 @@ app.listen(port, "0.0.0.0", () => {
function execFilePromise(cmd, args) {
return new Promise((resolve, reject) => {
execFile(cmd, args, (err, _stdout, stderr) => {
if (err) reject(new Error(stderr || String(err)));
if (err) {
// Provide clearer missing-binary errors
if (err.code === "ENOENT") {
return reject(new Error(`Missing dependency: ${cmd} (not found in PATH)`));
}
const meta = `cmd=${cmd} code=${err.code || "unknown"} signal=${err.signal || "none"}`;
return reject(new Error(`${meta}${stderr ? `; stderr=${stderr}` : ""}`));
}
else resolve();
});
});