WIP

lib/nodeinfo.ts

@@ -0,0 +1,61 @@
+/*!
+ * This file is part of Share₂Fedi
+ * https://github.com/kytta/share2fedi
+ *
+ * SPDX-FileCopyrightText: © 2023 Nikita Karamov <me@kytta.dev>
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { normalizeURL } from "$lib/url.ts";
+
+interface NodeInfoList {
+  links: {
+    rel: string;
+    href: string;
+  }[];
+}
+
+interface NodeInfo {
+  software: {
+    name: string;
+    version: string;
+    [key: string]: unknown;
+  };
+  [key: string]: unknown;
+}
+
+export const getSoftwareName = async (
+  domain: string,
+): Promise<string | undefined> => {
+  const nodeInfoListUrl = new URL(
+    "/.well-known/nodeinfo",
+    normalizeURL(domain),
+  );
+
+  let nodeInfoList: NodeInfoList;
+  try {
+    const nodeInfoListResponse = await fetch(nodeInfoListUrl);
+    nodeInfoList = await nodeInfoListResponse.json();
+  } catch (error) {
+    console.error("Could not fetch '.well-known/nodeinfo':", error);
+    return undefined;
+  }
+
+  for (const link of nodeInfoList.links) {
+    if (
+      /^http:\/\/nodeinfo\.diaspora\.software\/ns\/schema\/(1\.0|1\.1|2\.0|2\.1)/
+        .test(
+          link.rel,
+        )
+    ) {
+      const nodeInfoResponse = await fetch(link.href);
+      const nodeInfo = (await nodeInfoResponse.json()) as NodeInfo;
+
+      return nodeInfo.software.name;
+    }
+  }
+
+  // not found
+  console.warn("No NodeInfo found for domain:", domain);
+  return undefined;
+};