webui: Agentic Loop + MCP Client with support for Tools, Resources and Prompts (#18655)

tools/server/webui/src/lib/utils/favicon.ts

@@ -0,0 +1,34 @@
+/**
+ * Favicon utility functions for extracting favicons from URLs.
+ */
+
+import { getProxiedUrlString } from './cors-proxy';
+import {
+	GOOGLE_FAVICON_BASE_URL,
+	DEFAULT_FAVICON_SIZE,
+	DOMAIN_SEPARATOR,
+	ROOT_DOMAIN_MIN_PARTS
+} from '$lib/constants';
+
+/**
+ * Gets a favicon URL for a given URL using Google's favicon service.
+ * Returns null if the URL is invalid.
+ *
+ * @param urlString - The URL to get the favicon for
+ * @returns The favicon URL or null if invalid
+ */
+export function getFaviconUrl(urlString: string): string | null {
+	try {
+		const url = new URL(urlString);
+		const hostnameParts = url.hostname.split(DOMAIN_SEPARATOR);
+		const rootDomain =
+			hostnameParts.length >= ROOT_DOMAIN_MIN_PARTS
+				? hostnameParts.slice(-ROOT_DOMAIN_MIN_PARTS).join(DOMAIN_SEPARATOR)
+				: url.hostname;
+
+		const googleFaviconUrl = `${GOOGLE_FAVICON_BASE_URL}?domain=${rootDomain}&sz=${DEFAULT_FAVICON_SIZE}`;
+		return getProxiedUrlString(googleFaviconUrl);
+	} catch {
+		return null;
+	}
+}