Moving og generation to lib component (Geoff Rich influenced).

src/lib/components/socialImageCard.svelte

@@ -10,12 +10,12 @@
 
 <div class="social-card" style={`width: ${width}px; height: ${height}px;`}>
 	<div class="social-card-header">
-			<div class="social-card-title">
-				<div class="social-card-image">
-					<img src={image || '/images/b_shell_nut_favicon.png'} alt="Bradley Shellnut" />
-				</div>
-				<h1>{header}</h1>
+		<div class="social-card-title">
+			<div class="social-card-image">
+				<img src={image || '/images/b_shell_nut_favicon.png'} alt="Bradley Shellnut" />
 			</div>
+			<h1>{header}</h1>
+		</div>
 	</div>
 	<div class="social-card-content">
 		<h2 class="page">{page}</h2>

src/lib/renderImage.ts

@@ -0,0 +1,40 @@
+import satori from 'satori';
+import { Resvg } from '@resvg/resvg-js';
+import { html as toReactNode } from 'satori-html';
+
+// we use a Vite plugin to turn this import into the result of fs.readFileSync during build
+import firaSansSemiBold from '$lib/fonts/FiraSans-SemiBold.ttf';
+import { dev } from '$app/environment';
+
+export async function componentToPng(component, props, height, width) {
+	const result = component.render(props);
+	const markup = toReactNode(`${result.html}<style lang="css">${result.css.code}</style>`);
+
+	const svg = await satori(markup, {
+		fonts: [
+			{
+				name: 'Fira Sans',
+				data: Buffer.from(firaSansSemiBold),
+				style: 'normal'
+			}
+		],
+		height: +height,
+		width: +width
+	});
+
+	const resvg = new Resvg(svg, {
+		fitTo: {
+			mode: 'width',
+			value: +width
+		}
+	});
+
+	const png = resvg.render();
+
+	return new Response(png.asPng(), {
+		headers: {
+			'content-type': 'image/png',
+			'cache-control': dev ? 'no-cache, no-store' : 'public, immutable, no-transform, max-age=86400'
+		}
+	});
+}

src/lib/util/fetchBandcampAlbums.ts

@@ -1,7 +1,7 @@
 import { BANDCAMP_USERNAME, USE_REDIS_CACHE } from '$env/static/private';
 import scrapeIt from 'scrape-it';
 import type { ScrapeResult } from 'scrape-it';
-import { redis } from '../server/redis';
+import { redis } from '$lib/server/redis';
 import type { Album } from '../types/album';
 
 export async function fetchBandcampAlbums() {

src/routes/+page.server.ts

@@ -4,7 +4,12 @@ import type { PageServerLoad } from './$types';
 import { fetchBandcampAlbums } from '$lib/util/fetchBandcampAlbums';
 
 export const load: PageServerLoad = async ({ fetch, setHeaders, url }) => {
-	const baseUrl = new URL(url.origin).href || PUBLIC_SITE_URL || 'https://bradleyshellnut.com';
+	let baseUrl = 'https://bradleyshellnut.com';
+	if (url.origin.includes('prerender')) {
+		baseUrl = PUBLIC_SITE_URL || 'https://bradleyshellnut.com';
+	} else {
+		baseUrl = new URL(url.origin).href || PUBLIC_SITE_URL || 'https://bradleyshellnut.com';
+	}
 	const currentPageUrl = new URL(url.pathname, url.origin).href;
 
 	const metaTags: MetaTagsProps = Object.freeze({

src/routes/og/+server.ts

@@ -4,6 +4,8 @@ import { Resvg } from '@resvg/resvg-js';
 import { html as toReactNode } from 'satori-html';
 import FiraSansSemiBold from '$lib/fonts/FiraSans-SemiBold.ttf';
 import SocialImageCard from '$lib/components/socialImageCard.svelte';
+import { dev } from '$app/environment';
+import { componentToPng } from '$root/lib/renderImage';
 
 const height = 630;
 const width = 1200;
@@ -14,7 +16,8 @@ export const GET: RequestHandler = async ({ url }) => {
 		const header = url.searchParams.get('header') ?? undefined;
 		const page = url.searchParams.get('page') ?? undefined;
 		const content = url.searchParams.get('content') ?? '';
-		const result = SocialImageCard.render({
+
+		return componentToPng(SocialImageCard, {
 			header,
 			page,
 			content,
@@ -22,35 +25,7 @@ export const GET: RequestHandler = async ({ url }) => {
 			width,
 			height,
 			url: new URL(url.origin).href
-		});
-		console.log('result', result);
-		const element = toReactNode(`${result.html}<style>${result.css.code}</style>`);
-		const svg = await satori(element, {
-			fonts: [
-				{
-					name: 'Fira Sans',
-					data: Buffer.from(FiraSansSemiBold),
-					style: 'normal'
-				}
-			],
-			height,
-			width
-		});
-
-		const resvg = new Resvg(svg, {
-			fitTo: {
-				mode: 'width',
-				value: width
-			}
-		});
-
-		const image = resvg.render();
-
-		return new Response(image.asPng(), {
-			headers: {
-				'content-type': 'image/png'
-			}
-		});
+		}, height, width);
 	} catch (e) {
 		console.error(e);
 	}