feat: convert docs to pdf logic with api endpoint and dockerfile dependency

src/app/api/libre-convert/route.ts

@@ -0,0 +1,43 @@
+"use strict";
+import libre from "libreoffice-convert";
+import { promisify } from "util";
+import { NextRequest, NextResponse } from "next/server";
+
+const libreConvertAsync = promisify(libre.convert);
+
+export async function POST(request: NextRequest) {
+  if (request.method !== "POST") {
+    return NextResponse.json({ error: "Method not allowed" }, { status: 405 });
+  }
+
+  try {
+    const formData = await request.formData();
+    const file = formData.get("file") as Blob;
+
+    if (!file) {
+      return NextResponse.json({ error: "No file uploaded!" }, { status: 400 });
+    }
+
+    const arrayBuffer = await file.arrayBuffer();
+    const fileBuffer = Buffer.from(arrayBuffer);
+    const pdfBuffer = await libreConvertAsync(
+      fileBuffer,
+      ".pdf",
+      "writer_pdf_Export",
+    );
+
+    return new Response(pdfBuffer, {
+      status: 200,
+      headers: {
+        "Content-Type": "application/pdf",
+        "Content-Disposition": "attachment; filename=converted.pdf",
+      },
+    });
+  } catch (error: unknown) {
+    console.error("Convert error: ", error);
+    return NextResponse.json(
+      { error: "Error while converting!" },
+      { status: 500 },
+    );
+  }
+}