Implement remote status retrieval

src/common/remote/webfinger.ts

@@ -0,0 +1,25 @@
+const WebFinger = require('webfinger.js');
+
+const webFinger = new WebFinger({});
+
+type ILink = {
+  href: string;
+  rel: string;
+}
+
+type IWebFinger = {
+  links: Array<ILink>;
+  subject: string;
+}
+
+export default (query, verifier): Promise<IWebFinger> => new Promise((res, rej) => webFinger.lookup(query, (error, result) => {
+	if (error) {
+		return rej(error);
+	}
+
+	if (result.object.subject.toLowerCase().replace(/^acct:/, '') !== verifier) {
+		return rej('WebFinger verfification failed');
+	}
+
+	res(result.object);
+}));