Compress user avatars in update_profile route

src/lib/server/image.ts

@@ -0,0 +1,23 @@
+import sharp from "sharp";
+
+/**
+ * Convert any [ArrayBuffer] containing image data to an [avif] [Blob].
+ * Also allows downscaling and lossy compression.
+ * Set either [width] or [height] to downscale while keeping the aspect ratio.
+ */
+export const image_to_avif = async (
+  data: ArrayBuffer,
+  width: number | undefined = undefined,
+  height: number | undefined = undefined,
+  quality: number = 50,
+  effort: number = 4,
+): Promise<Blob> => {
+  const compressed: Buffer = await sharp(data)
+    .resize(width, height)
+    .avif({ quality: quality, effort: effort })
+    .toBuffer();
+
+  console.log(`image_to_avif: ${data.byteLength} Bytes -> ${compressed.length} Bytes`);
+
+  return new Blob([compressed]);
+};

src/routes/+layout.svelte

@@ -5,14 +5,12 @@
   import type { LayoutData } from "./$types";
   import { page } from "$app/stores";
 
-  import { Button, MenuDrawerIcon, UserIcon, Input, PasswordIcon, Card } from "$lib/components";
+  import { Button, MenuDrawerIcon, UserIcon, Input, PasswordIcon } from "$lib/components";
-  import { get_avatar_preview_event_handler, get_image_preview_event_handler } from "$lib/image";
+  import { get_avatar_preview_event_handler } from "$lib/image";
 
   import {
     AppBar,
-    popup,
     storePopup,
-    type PopupSettings,
     initializeStores,
     Drawer,
     getDrawerStore,

src/routes/profile/+page.server.ts

@@ -1,7 +1,7 @@
 import { form_data_clean, form_data_ensure_keys, form_data_get_and_remove_id } from "$lib/form";
 import { error, redirect } from "@sveltejs/kit";
 import type { Actions } from "./$types";
-import type { User } from "$lib/schema";
+import { image_to_avif } from "$lib/server/image";
 
 export const actions = {
   create_profile: async ({ request, locals }): Promise<void> => {
@@ -9,7 +9,7 @@ export const actions = {
     form_data_ensure_keys(data, ["username", "password", "redirect_url"]);
 
     // Confirm password lol
-    const record = await locals.pb.collection("users").create({
+    await locals.pb.collection("users").create({
       username: data.get("username")?.toString(),
       password: data.get("password")?.toString(),
       passwordConfirm: data.get("password")?.toString(),
@@ -30,7 +30,23 @@ export const actions = {
     form_data_ensure_keys(data, ["redirect_url"]);
     const id: string = form_data_get_and_remove_id(data);
 
-    const record: User = await locals.pb.collection("users").update(id, data);
+    if (data.has("avatar")) {
+      // Compress image
+      const compressed: Blob = await image_to_avif(
+        await (data.get("avatar") as File).arrayBuffer(),
+        256,
+        256,
+      );
+
+      // At most 20kB
+      if (compressed.size > 20000) {
+        error(400, "Avatar too large!");
+      }
+
+      data.set("avatar", compressed);
+    }
+
+    await locals.pb.collection("users").update(id, data);
 
     redirect(303, data.get("redirect_url")?.toString() ?? "/");
   },

vite.config.ts

@@ -1,6 +1,11 @@
-import { sveltekit } from '@sveltejs/kit/vite';
+import { sveltekit } from "@sveltejs/kit/vite";
-import { defineConfig } from 'vite';
+import { defineConfig } from "vite";
 
 export default defineConfig({
-	plugins: [sveltekit()]
+  plugins: [sveltekit()],
+  build: {
+    rollupOptions: {
+      external: ["sharp"],
+    },
+  },
 });