feat: video-to-audio converter implemented without logic

backend/src/routes/videoconvert.route.ts

@@ -0,0 +1,70 @@
+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 } = {
+  mp4: "video/mp4",
+  avi: "video/x-msvideo",
+  mkv: "video/x-matroska",
+};
+
+export async function videoConvert(app: FastifyInstance) {
+  app.post(
+    "/api/video-convert",
+    async (request: FastifyRequest, reply: FastifyReply) => {
+      try {
+        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;
+          }
+        }
+
+        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 format = outputFileExt.substring(1);
+        const mimeType = mimeTypes[format] || "application/octet-stream";
+
+        const convertedBuffer = await libreConvertAsync(
+          fileBuffer,
+          outputFileExt,
+          undefined,
+        );
+
+        reply
+          .header("Content-Type", mimeType)
+          .header(
+            "Content-Disposition",
+            `attachment; filename="converted${outputFileExt}"`,
+          )
+          .status(200)
+          .send(convertedBuffer);
+      } catch (error) {
+        console.error("Convert error:", error);
+        reply.status(500).send({ error: "Error while converting!" });
+      }
+    },
+  );
+}