matthew/PostConvert
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Update server.js

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This commit is contained in:
Matthew Jackson
2025-12-30 09:13:39 -08:00
committed by GitHub
parent 30b073782b
commit 60baaf9f6c
1 changed files with 35 additions and 14 deletions
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49
server.js
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@@ -32,17 +32,16 @@ app.post("/convert", async (req, res) => {
const input = req.body;
if (!input || input.length === 0) return res.status(400).send("Empty body");
const contentType = (req.headers["content-type"] || "").toLowerCase();
const filename = (req.headers["x-filename"] || "").toLowerCase();
const contentType = String(req.headers["content-type"] || "").toLowerCase();
const filename = String(req.headers["x-filename"] || "").toLowerCase();
const isPdf = contentType === "application/pdf" || filename.endsWith(".pdf");
let imageBuffer = input;
if (isPdf) {
// PDF -> first page JPEG at 300 DPI
const id = randomUUID();
const pdfPath = `/tmp/${id}.pdf`;
const outPrefix = `/tmp/${id}`; // output will be `${outPrefix}.jpg`
const outPrefix = `/tmp/${id}`;
await fs.writeFile(pdfPath, input);
@@ -79,27 +78,28 @@ app.post("/convert/pdf", async (req, res) => {
const input = req.body;
if (!input || input.length === 0) return res.status(400).send("Empty body");
const contentType = (req.headers["content-type"] || "").toLowerCase();
const filename = (req.headers["x-filename"] || "").toLowerCase();
const contentType = String(req.headers["content-type"] || "").toLowerCase();
const filename = String(req.headers["x-filename"] || "").toLowerCase();
const isPdf = contentType === "application/pdf" || filename.endsWith(".pdf");
if (!isPdf) {
return res.status(415).send("This endpoint only accepts PDFs (Content-Type: application/pdf)");
return res
.status(415)
.send("This endpoint only accepts PDFs (Content-Type: application/pdf)");
}
// Safety limits (tweak as you like)
// Safety limits
const dpi = clampInt(req.headers["x-pdf-dpi"], 72, 600, 300);
const maxPages = clampInt(req.headers["x-pdf-max-pages"], 1, 50, 20);
const id = randomUUID();
const pdfPath = `/tmp/${id}.pdf`;
const outDir = `/tmp/${id}-pages`;
const outPrefix = path.join(outDir, "page"); // produces page-1.jpg, page-2.jpg, ...
const outPrefix = path.join(outDir, "page"); // page-1.jpg, page-2.jpg ...
await fs.mkdir(outDir, { recursive: true });
await fs.writeFile(pdfPath, input);
// Render all pages to JPEG files
await execFilePromise("pdftoppm", [
"-jpeg",
"-r",
@@ -108,7 +108,6 @@ app.post("/convert/pdf", async (req, res) => {
outPrefix,
]);
// Collect rendered pages
const files = (await fs.readdir(outDir))
.filter((f) => /^page-\d+\.jpg$/i.test(f))
.sort((a, b) => pageNum(a) - pageNum(b));
@@ -122,7 +121,6 @@ app.post("/convert/pdf", async (req, res) => {
.send(`PDF has ${files.length} pages; exceeds maxPages=${maxPages}`);
}
// Stream a ZIP back
res.status(200);
res.setHeader("Content-Type", "application/zip");
res.setHeader(
@@ -139,11 +137,12 @@ app.post("/convert/pdf", async (req, res) => {
archive.pipe(res);
// Add each page file to the zip as 001.jpg, 002.jpg, ...
for (let i = 0; i < files.length; i++) {
const f = files[i];
const n = String(i + 1).padStart(3, "0");
archive.append(createReadStream(path.join(outDir, f)), { name: `${n}.jpg` });
archive.append(createReadStream(path.join(outDir, f)), {
name: `${n}.jpg`,
});
}
await archive.finalize();
@@ -161,4 +160,26 @@ app.use((err, _req, res, next) => {
return next(err);
});
// ✅ MISSING PART: start the server + helpers
const port = Number(process.env.PORT) || 8080;
app.listen(port, "0.0.0.0", () => {
console.log(`converter listening on 0.0.0.0:${port}`);
});
function execFilePromise(cmd, args) {
return new Promise((resolve, reject) => {
execFile(cmd, args, (err) => (err ? reject(err) : resolve()));
});
}
function pageNum(filename) {
const m = filename.match(/page-(\d+)\.jpg/i);
return m ? Number(m[1]) : 0;
}
function clampInt(value, min, max, fallback) {
const n = Number(value);
if (!Number.isFinite(n)) return fallback;
return Math.max(min, Math.min(max, Math.floor(n)));
}