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fix(pdf-compress): fix broken multipart parsing + add body size limit

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Extreme mode: replace fragile manual multipart boundary parsing (which
extracted only a fraction of large files, producing empty PDFs) with
standard req.formData(). Add GS output validation + stderr capture.

Stirling mode: parse formData first then build fresh FormData for
Stirling instead of raw body passthrough (which lost data on large
files). Add 5min timeout + original/compressed size headers.

next.config: add 250MB body size limit for server actions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
AI Assistant
2026-03-13 16:18:34 +02:00
parent 81c61d8411
commit 194ddf0849
3 changed files with 109 additions and 98 deletions
Download Patch File Download Diff File Expand all files Collapse all files
next.config.ts
+5
View File
@@ -2,6 +2,11 @@ import type { NextConfig } from "next";
const nextConfig: NextConfig = {
output: 'standalone',
experimental: {
serverActions: {
bodySizeLimit: '250mb',
},
},
};
export default nextConfig;
src/app/api/compress-pdf/extreme/route.ts
+71 -92
View File
@@ -1,13 +1,10 @@
import { NextRequest, NextResponse } from "next/server";
import { writeFile, readFile, unlink, mkdir, stat } from "fs/promises";
import { createWriteStream } from "fs";
import { writeFile, readFile, unlink, mkdir } from "fs/promises";
import { execFile } from "child_process";
import { promisify } from "util";
import { randomUUID } from "crypto";
import { join } from "path";
import { tmpdir } from "os";
import { Readable } from "stream";
import { pipeline } from "stream/promises";
const execFileAsync = promisify(execFile);
@@ -20,7 +17,6 @@ function gsArgs(input: string, output: string): string[] {
"-dCompatibilityLevel=1.5",
"-dNOPAUSE",
"-dBATCH",
"-dQUIET",
`-sOutputFile=${output}`,
"-dPDFSETTINGS=/screen",
// Force recompression of ALL images (the #1 key to matching iLovePDF)
@@ -100,105 +96,59 @@ async function cleanup(dir: string) {
export async function POST(req: NextRequest) {
const tmpDir = join(tmpdir(), `pdf-extreme-${randomUUID()}`);
try {
// Stream body directly to temp file — avoids req.formData() size limit
// that causes "Failed to parse body as FormData" on large files
await mkdir(tmpDir, { recursive: true });
const rawPath = join(tmpDir, "raw-upload");
const inputPath = join(tmpDir, "input.pdf");
const gsOutputPath = join(tmpDir, "gs-output.pdf");
const finalOutputPath = join(tmpDir, "final.pdf");
if (!req.body) {
return NextResponse.json(
{ error: "Lipsește fișierul PDF." },
{ status: 400 },
);
}
// Write the raw multipart body to disk
const nodeStream = Readable.fromWeb(req.body as import("stream/web").ReadableStream);
await pipeline(nodeStream, createWriteStream(rawPath));
// Extract the PDF binary from the multipart body.
// Multipart format:
// --boundary\r\n
// Content-Disposition: form-data; name="fileInput"; filename="x.pdf"\r\n
// Content-Type: application/pdf\r\n
// \r\n
// <FILE BYTES>
// \r\n--boundary--\r\n
const rawBuf = await readFile(rawPath);
const contentType = req.headers.get("content-type") || "";
const boundaryMatch = contentType.match(/boundary=(?:"([^"]+)"|([^\s;]+))/);
const boundary = boundaryMatch?.[1] ?? boundaryMatch?.[2] ?? "";
if (!boundary) {
return NextResponse.json(
{ error: "Lipsește fișierul PDF." },
{ status: 400 },
);
}
const boundaryBuf = Buffer.from(`--${boundary}`);
// Find the part that contains a filename (the file upload part).
// There may be multiple parts — we need the one with "filename=".
let fileStart = -1;
let searchFrom = 0;
while (searchFrom < rawBuf.length) {
const partStart = rawBuf.indexOf(boundaryBuf, searchFrom);
if (partStart === -1) break;
// Skip past boundary line to get to headers
const headersStart = rawBuf.indexOf(Buffer.from("\r\n"), partStart);
if (headersStart === -1) break;
const headerEnd = rawBuf.indexOf(Buffer.from("\r\n\r\n"), headersStart);
if (headerEnd === -1) break;
// Check if this part's headers contain a filename
const headers = rawBuf.subarray(headersStart, headerEnd).toString("utf8");
if (headers.includes("filename=")) {
fileStart = headerEnd + 4; // skip \r\n\r\n
break;
// Use standard formData() — works reliably for large files in Next.js 16
let pdfBuffer: Buffer;
try {
const formData = await req.formData();
const fileField = formData.get("fileInput");
if (!fileField || !(fileField instanceof Blob)) {
return NextResponse.json(
{ error: "Lipsește fișierul PDF." },
{ status: 400 },
);
}
// Move past this part's headers to search for next boundary
searchFrom = headerEnd + 4;
}
if (fileStart === -1) {
pdfBuffer = Buffer.from(await fileField.arrayBuffer());
} catch (parseErr) {
const msg =
parseErr instanceof Error ? parseErr.message : "Parse error";
return NextResponse.json(
{ error: "Lipsește fișierul PDF." },
{ error: `Nu s-a putut citi fișierul: ${msg}` },
{ status: 400 },
);
}
// Find the closing boundary after the file content.
// Search from the END of the buffer backwards, since the PDF binary
// could theoretically contain the boundary string by coincidence.
const closingMarker = Buffer.from(`\r\n--${boundary}`);
const fileEnd = rawBuf.lastIndexOf(closingMarker);
const pdfData = (fileEnd > fileStart)
? rawBuf.subarray(fileStart, fileEnd)
: rawBuf.subarray(fileStart);
if (pdfBuffer.length < 100) {
return NextResponse.json(
{ error: "Fișierul PDF este gol sau prea mic." },
{ status: 400 },
);
}
await writeFile(inputPath, pdfData);
const originalSize = pdfData.length;
// Clean up raw file early to free disk space
await unlink(rawPath).catch(() => {});
await writeFile(inputPath, pdfBuffer);
const originalSize = pdfBuffer.length;
// Step 1: Ghostscript — aggressive image recompression + downsampling
try {
await execFileAsync("gs", gsArgs(inputPath, gsOutputPath), {
timeout: 120_000,
});
const { stderr } = await execFileAsync(
"gs",
gsArgs(inputPath, gsOutputPath),
{
timeout: 300_000, // 5 min for very large files
maxBuffer: 10 * 1024 * 1024, // 10MB stderr buffer
},
);
if (stderr && stderr.includes("Error")) {
console.error("[PDF extreme] GS stderr:", stderr.slice(0, 500));
}
} catch (gsErr) {
const msg = gsErr instanceof Error ? gsErr.message : "Ghostscript failed";
const msg =
gsErr instanceof Error ? gsErr.message : "Ghostscript failed";
if (msg.includes("ENOENT") || msg.includes("not found")) {
return NextResponse.json(
{
@@ -208,8 +158,38 @@ export async function POST(req: NextRequest) {
{ status: 501 },
);
}
// Include stderr in error for debugging
const stderr =
gsErr && typeof gsErr === "object" && "stderr" in gsErr
? String((gsErr as { stderr: unknown }).stderr).slice(0, 300)
: "";
return NextResponse.json(
{ error: `Ghostscript error: ${msg}` },
{
error: `Ghostscript error: ${msg.slice(0, 200)}${stderr ? ` — ${stderr}` : ""}`,
},
{ status: 500 },
);
}
// Verify GS output is a valid non-empty PDF
let gsSize = 0;
try {
const gsStat = await import("fs/promises").then((fs) =>
fs.stat(gsOutputPath),
);
gsSize = gsStat.size;
} catch {
return NextResponse.json(
{ error: "Ghostscript nu a produs fișier output." },
{ status: 500 },
);
}
if (gsSize < 100) {
return NextResponse.json(
{
error: `Ghostscript a produs un fișier gol (${gsSize} bytes). PDF-ul poate conține elemente incompatibile.`,
},
{ status: 500 },
);
}
@@ -218,7 +198,7 @@ export async function POST(req: NextRequest) {
let finalPath = gsOutputPath;
try {
await execFileAsync("qpdf", qpdfArgs(gsOutputPath, finalOutputPath), {
timeout: 30_000,
timeout: 60_000,
});
finalPath = finalOutputPath;
} catch {
@@ -230,8 +210,7 @@ export async function POST(req: NextRequest) {
// If compression made it bigger, return original
if (compressedSize >= originalSize) {
const originalBuffer = await readFile(inputPath);
return new NextResponse(originalBuffer, {
return new NextResponse(new Uint8Array(pdfBuffer), {
status: 200,
headers: {
"Content-Type": "application/pdf",
@@ -243,7 +222,7 @@ export async function POST(req: NextRequest) {
});
}
return new NextResponse(resultBuffer, {
return new NextResponse(new Uint8Array(resultBuffer), {
status: 200,
headers: {
"Content-Type": "application/pdf",
src/app/api/compress-pdf/route.ts
+33 -6
View File
@@ -7,17 +7,42 @@ const STIRLING_PDF_API_KEY =
export async function POST(req: NextRequest) {
try {
// Stream body directly to Stirling — avoids FormData re-serialization
// failure on large files ("Failed to parse body as FormData")
// Parse incoming form data — get file + optimizeLevel
let formData: FormData;
try {
formData = await req.formData();
} catch (parseErr) {
const msg =
parseErr instanceof Error ? parseErr.message : "Parse error";
return NextResponse.json(
{ error: `Nu s-a putut citi formularul: ${msg}` },
{ status: 400 },
);
}
const fileField = formData.get("fileInput");
if (!fileField || !(fileField instanceof Blob)) {
return NextResponse.json(
{ error: "Lipsește fișierul PDF." },
{ status: 400 },
);
}
const optimizeLevel = formData.get("optimizeLevel") ?? "3";
const originalSize = fileField.size;
// Build fresh FormData for Stirling
const stirlingForm = new FormData();
stirlingForm.append("fileInput", fileField, "input.pdf");
stirlingForm.append("optimizeLevel", String(optimizeLevel));
const res = await fetch(`${STIRLING_PDF_URL}/api/v1/misc/compress-pdf`, {
method: "POST",
headers: {
"X-API-KEY": STIRLING_PDF_API_KEY,
"Content-Type": req.headers.get("content-type") || "",
},
body: req.body,
// @ts-expect-error duplex required for streaming request bodies in Node
duplex: "half",
body: stirlingForm,
signal: AbortSignal.timeout(300_000), // 5 min for large files
});
if (!res.ok) {
@@ -36,6 +61,8 @@ export async function POST(req: NextRequest) {
headers: {
"Content-Type": "application/pdf",
"Content-Disposition": 'attachment; filename="compressed.pdf"',
"X-Original-Size": String(originalSize),
"X-Compressed-Size": String(buffer.length),
},
});
} catch (err) {