atmosphere explorer
pds.ls
tool
typescript
atproto
favicon fetching through worker
+126
-11
+1
.gitignore
+1
.gitignore
+12
-5
src/components/favicon.tsx
+12
-5
src/components/favicon.tsx
···
6
6
wrapper?: (children: JSX.Element) => JSX.Element;
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}) => {
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const [loaded, setLoaded] = createSignal(false);
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+
const [src, setSrc] = createSignal("");
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const domain = () => (props.reverse ? props.domain.split(".").reverse().join(".") : props.domain);
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+
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const workerUrl = () => `/favicon?domain=${encodeURIComponent(domain())}`;
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const directUrl = () => `https://${domain()}/favicon.ico`;
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const content = (
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<Switch>
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<Match when={domain() === "tangled.sh" || domain() === "tangled.org"}>
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<span class="iconify i-tangled size-4" />
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</Match>
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-
<Match when={["bsky.app", "bsky.chat"].includes(domain())}>
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-
<img src="https://web-cdn.bsky.app/static/apple-touch-icon.png" class="size-4" />
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-
</Match>
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<Match when={true}>
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<Show when={!loaded()}>
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<span class="iconify lucide--globe size-4 text-neutral-400 dark:text-neutral-500" />
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</Show>
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<img
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-
src={`https://${domain()}/favicon.ico`}
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+
src={src() || workerUrl()}
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class="size-4"
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classList={{ hidden: !loaded() }}
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onLoad={() => setLoaded(true)}
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-
onError={() => setLoaded(false)}
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+
onError={() => {
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if (!src()) {
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setSrc(directUrl());
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} else {
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setLoaded(false);
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+
}
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+
}}
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/>
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</Match>
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</Switch>
+100
src/worker.js
+100
src/worker.js
···
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}
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}
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489
+
const MAX_FAVICON_SIZE = 100 * 1024; // 100KB
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+
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async function handleFavicon(searchParams) {
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const domain = searchParams.get("domain");
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if (!domain) {
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return new Response("Missing domain param", { status: 400 });
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+
}
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+
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let faviconUrl = null;
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+
try {
499
+
const pageRes = await fetch(`https://${domain}/`, {
500
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signal: AbortSignal.timeout(5000),
501
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headers: { "User-Agent": "PDSls-Favicon/1.0" },
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redirect: "follow",
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});
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+
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if (pageRes.ok && (pageRes.headers.get("content-type") ?? "").includes("text/html")) {
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+
let bestHref = null;
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let bestPriority = -1;
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+
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const rewriter = new HTMLRewriter().on("link", {
510
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element(el) {
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const rel = (el.getAttribute("rel") ?? "").toLowerCase();
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if (!rel.includes("icon")) return;
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const href = el.getAttribute("href");
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if (!href) return;
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+
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// Prefer apple-touch-icon > icon with sizes > icon > shortcut icon
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let priority = 0;
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if (rel === "apple-touch-icon") priority = 3;
519
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else if (rel === "icon" && el.getAttribute("sizes")) priority = 2;
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else if (rel === "icon") priority = 1;
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+
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+
if (priority > bestPriority) {
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+
bestPriority = priority;
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bestHref = href;
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+
}
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+
},
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+
});
528
+
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+
const transformed = rewriter.transform(pageRes);
530
+
await transformed.text();
531
+
532
+
if (bestHref) {
533
+
try {
534
+
faviconUrl = new URL(bestHref, `https://${domain}/`).href;
535
+
} catch {
536
+
faviconUrl = null;
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+
}
538
+
}
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+
}
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+
} catch {}
541
+
542
+
if (!faviconUrl) {
543
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faviconUrl = `https://${domain}/favicon.ico`;
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+
}
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+
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+
try {
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const iconRes = await fetch(faviconUrl, {
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+
signal: AbortSignal.timeout(5000),
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redirect: "follow",
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+
});
551
+
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+
if (!iconRes.ok) {
553
+
return new Response("Favicon not found", { status: 404 });
554
+
}
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+
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+
const contentType = iconRes.headers.get("content-type") ?? "";
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+
if (!contentType.includes("image") && !contentType.includes("icon")) {
558
+
return new Response("Not an image", { status: 404 });
559
+
}
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+
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+
const contentLength = parseInt(iconRes.headers.get("content-length") ?? "0", 10);
562
+
if (contentLength > MAX_FAVICON_SIZE) {
563
+
return new Response("Favicon too large", { status: 413 });
564
+
}
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+
566
+
const body = await iconRes.arrayBuffer();
567
+
if (body.byteLength > MAX_FAVICON_SIZE) {
568
+
return new Response("Favicon too large", { status: 413 });
569
+
}
570
+
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+
return new Response(body, {
572
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headers: {
573
+
"Content-Type": contentType,
574
+
"Cache-Control": "public, max-age=86400",
575
+
"Access-Control-Allow-Origin": "*",
576
+
},
577
+
});
578
+
} catch {
579
+
return new Response("Failed to fetch favicon", { status: 502 });
580
+
}
581
+
}
582
+
489
583
export default {
490
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async fetch(request, env) {
491
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const url = new URL(request.url);
···
493
587
if (url.pathname === "/og-image") {
494
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return handleOgImage(url.searchParams).catch(
495
589
(err) => new Response(`Failed to generate image: ${err?.message ?? err}`, { status: 500 }),
590
+
);
591
+
}
592
+
593
+
if (url.pathname === "/favicon") {
594
+
return handleFavicon(url.searchParams).catch(
595
+
(err) => new Response(`Failed to fetch favicon: ${err?.message ?? err}`, { status: 500 }),
496
596
);
497
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}
498
598