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feat: extended backend functionality for converting files to the selected file extension sent to the backend via api

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theoleuthardt 2025-02-16 17:52:08 +01:00
parent 2c582aaa60
commit 43abb6d5fd
2 changed files with 47 additions and 12 deletions
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2
backend/server.ts
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@ -5,7 +5,7 @@ import { libreConvert } from "./src/routes/libreconvert.route";
const app = Fastify({ logger: true });
app.register(cors, { origin: "*" });
app.register(cors, { origin: "*", exposedHeaders: 'Content-Disposition' });
app.register(multipart);
app.register(libreConvert);

55
backend/src/routes/libreconvert.route.ts
View file

@ -1,27 +1,62 @@
import { FastifyInstance, FastifyReply, FastifyRequest } from "fastify";
import * as libre from "libreoffice-convert";
import { promisify } from "util";
import { MultipartValue } from "@fastify/multipart";
const libreConvertAsync = promisify(libre.convert);
const mimeTypes: { [key: string]: string } = {
'pdf': 'application/pdf',
'html': 'text/html',
'doc': 'application/msword',
'docx': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'txt': 'text/plain',
'rtf': 'application/rtf',
'odt': 'application/vnd.oasis.opendocument.text',
'xlsx': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'xls': 'application/vnd.ms-excel',
'ods': 'application/vnd.oasis.opendocument.spreadsheet',
'pptx': 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
'ppt': 'application/vnd.ms-powerpoint',
'odp': 'application/vnd.oasis.opendocument.presentation'
};
export async function libreConvert(app: FastifyInstance) {
app.post("/api/libre-convert", async (request: FastifyRequest, reply: FastifyReply) => {
try {
const data = await request.file();
if (!data) {
return reply.status(400).send({ error: "No file uploaded!" });
const parts = request.parts();
let fileBuffer: Buffer | null = null;
let outputFileExt = "";
for await (const part of parts) {
if (part.type === "file") {
fileBuffer = await part.toBuffer();
} else if (part.fieldname === "outputFormat" && part.type === "field") {
outputFileExt = (part as MultipartValue<string>).value;
console.log("Output format:", outputFileExt);
}
}
const ext = ".pdf";
const format = ext.substring(1);
const fileBuffer = await data.toBuffer();
if (!fileBuffer) {
return reply.status(400).send({ error: "No file uploaded!" });
}
if (!outputFileExt) {
return reply.status(400).send({ error: "No output format provided!" });
}
if (!outputFileExt.startsWith(".")) {
outputFileExt = "." + outputFileExt;
}
const pdfBuffer = await libreConvertAsync(fileBuffer, ext, undefined);
const format = outputFileExt.substring(1);
const mimeType = mimeTypes[format] || 'application/octet-stream';
const convertedBuffer = await libreConvertAsync(fileBuffer, outputFileExt, undefined);
reply
.header("Content-Type", "application/" + format)
.header("Content-Disposition", "attachment; filename=converted" + ext)
.send(pdfBuffer);
.header("Content-Type", mimeType)
.header("Content-Disposition", `attachment; filename="converted${outputFileExt}"`)
.send(convertedBuffer);
} catch (error) {
console.error("Convert error:", error);
reply.status(500).send({ error: "Error while converting!" });