v12 (#5712)

Co-authored-by: MeiMei <30769358+mei23@users.noreply.github.com>
Co-authored-by: Satsuki Yanagi <17376330+u1-liquid@users.noreply.github.com>

src/client/scripts/get-static-image-url.ts

@@ -0,0 +1,11 @@
+import { url as instanceUrl } from '../config';
+import * as url from '../../prelude/url';
+
+export function getStaticImageUrl(baseUrl: string): string {
+	const u = new URL(baseUrl);
+	const dummy = `${u.host}${u.pathname}`;	// 拡張子がないとキャッシュしてくれないCDNがあるので
+	return `${instanceUrl}/proxy/${dummy}?${url.query({
+		url: u.href,
+		static: '1'
+	})}`;
+}