feat: add gravatar profile picture integration

frontend/src/lib/components/header/header-avatar.svelte

@@ -3,6 +3,7 @@
 	import * as DropdownMenu from '$lib/components/ui/dropdown-menu';
 	import WebAuthnService from '$lib/services/webauthn-service';
 	import userStore from '$lib/stores/user-store';
+	import { createSHA256hash } from '$lib/utils/crypto-util';
 	import { LucideLogOut, LucideUser } from 'lucide-svelte';
 
 	const webauthnService = new WebAuthnService();
@@ -11,6 +12,13 @@
 		($userStore!.firstName.charAt(0) + $userStore!.lastName?.charAt(0)).toUpperCase()
 	);
 
+	let gravatarURL: string | undefined = $state();
+	if ($userStore) {
+		createSHA256hash($userStore.email).then((email) => {
+			gravatarURL = `https://www.gravatar.com/avatar/${email}`;
+		});
+	}
+
 	async function logout() {
 		await webauthnService.logout();
 		window.location.reload();
@@ -19,7 +27,8 @@
 
 <DropdownMenu.Root>
 	<DropdownMenu.Trigger
-		><Avatar.Root>
+		><Avatar.Root class="h-9 w-9">
+			<Avatar.Image src={gravatarURL} />
 			<Avatar.Fallback>{initials}</Avatar.Fallback>
 		</Avatar.Root></DropdownMenu.Trigger
 	>

frontend/src/lib/components/header/header.svelte

@@ -12,7 +12,11 @@
 </script>
 
 <div class=" w-full {isAuthPage ? 'absolute top-0 z-10 mt-4' : 'border-b'}">
-	<div class="mx-auto flex w-full max-w-[1640px] items-center justify-between px-4 md:px-10">
+	<div
+		class="{!isAuthPage
+			? 'max-w-[1640px]'
+			: ''} mx-auto flex w-full items-center justify-between px-4 md:px-10"
+	>
 		<div class="flex h-16 items-center">
 			{#if !isAuthPage}
 				<Logo class="mr-3 h-10 w-10" />

frontend/src/lib/utils/crypto-util.ts

@@ -0,0 +1,7 @@
+export async function createSHA256hash(input: string) {
+	const msgUint8 = new TextEncoder().encode(input); // encode as (utf-8) Uint8Array
+	const hashBuffer = await crypto.subtle.digest('SHA-256', msgUint8); // hash the message
+	const hashArray = Array.from(new Uint8Array(hashBuffer)); // convert buffer to byte array
+	const hashHex = hashArray.map((b) => b.toString(16).padStart(2, '0')).join(''); // convert bytes to hex string
+	return hashHex;
+}