From 8142c72c93ee46c9c4b0cb7973b8b42e40e11f67 Mon Sep 17 00:00:00 2001
From: Christoph Urlacher <christoph.urlacher@protonmail.com>
Date: Mon, 17 Feb 2025 18:14:50 +0100
Subject: [PATCH] Api/Compress: Add image compression server endpoint

---
 src/routes/api/compress/+server.ts | 45 ++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 src/routes/api/compress/+server.ts

diff --git a/src/routes/api/compress/+server.ts b/src/routes/api/compress/+server.ts
new file mode 100644
index 0000000..e037fd6
--- /dev/null
+++ b/src/routes/api/compress/+server.ts
@@ -0,0 +1,45 @@
+import { image_to_avif } from "$lib/server/image";
+import { error } from "@sveltejs/kit";
+import type { RequestHandler } from "./$types";
+
+/**
+ * This route is available at /api/compress.
+ * It will return the image as a compressed [avif] [Blob].
+ * We need this because [sharp] is a server-side node library.
+ */
+export const POST: RequestHandler = async ({ request }) => {
+  console.log("Hit /api/compress...");
+  const data: FormData = await request.formData();
+
+  const image: File | undefined = data.has("image") ? (data.get("image") as File) : undefined;
+  const width: number | undefined = data.has("width")
+    ? parseInt(data.get("width")?.toString() ?? "-1")
+    : undefined;
+  const height: number | undefined = data.has("height")
+    ? parseInt(data.get("height")?.toString() ?? "-1")
+    : undefined;
+  const quality: number | undefined = data.has("quality")
+    ? parseInt(data.get("quality")?.toString() ?? "-1")
+    : undefined;
+  const effort: number | undefined = data.has("effort")
+    ? parseInt(data.get("effort")?.toString() ?? "-1")
+    : undefined;
+
+  if (!image) {
+    error(500, "Can't compress image without image data");
+  }
+
+  const compressedImage: Blob = await image_to_avif(
+    await image.arrayBuffer(),
+    width,
+    height,
+    quality,
+    effort,
+  );
+
+  return new Response(compressedImage, {
+    headers: {
+      "Content-Type": "image/avif",
+    },
+  });
+};