feat: backend route for removing backgrounds from images with imgly

backend/src/routes/removebg.route.ts

@@ -0,0 +1,43 @@
+import { FastifyInstance, FastifyReply, FastifyRequest } from "fastify";
+import { Config, removeBackground } from "@imgly/background-removal-node";
+import sharp from "sharp";
+
+export async function removeBG(app: FastifyInstance) {
+  app.post(
+    "/api/remove-bg",
+    async (request: FastifyRequest, reply: FastifyReply) => {
+      try {
+        const parts = request.parts();
+
+        let fileBuffer: Buffer | null = null;
+
+        for await (const part of parts) {
+          if (part.type === "file") {
+            fileBuffer = await part.toBuffer();
+          }
+        }
+
+        if (!fileBuffer) {
+          return reply.status(400).send({ error: "No file uploaded!" });
+        }
+
+        console.log("Received file, buffer length:", fileBuffer.length);
+
+        const rightFileBuffer = await sharp(fileBuffer)
+          .toFormat("png")
+          .toBuffer();
+        console.log("Converted file:", rightFileBuffer);
+        const convertedBuffer = await removeBackground(rightFileBuffer);
+
+        reply
+          .header("Content-Type", "image/png")
+          .header("Content-Disposition", `attachment; filename="converted.png"`)
+          .status(200)
+          .send(convertedBuffer);
+      } catch (error) {
+        console.error("Convert error:", error);
+        reply.status(500).send({ error: "Error while converting!" });
+      }
+    },
+  );
+}