try to fix oembed

src/index.ts

@@ -70,7 +70,7 @@ interface Instance {
 
 const app = express();
 
-type instace = {
+export type instace = {
 	name: string;
 	description?: string;
 	descriptionLong?: string;
@@ -146,7 +146,7 @@ app.use("/getupdates", async (_req: Request, res: Response) => {
 });
 
 app.use("/services/oembed", (req: Request, res: Response) => {
-	inviteResponse(req, res);
+	inviteResponse(req, res, instances);
 });
 
 app.use("/uptime", (req: Request, res: Response) => {
@@ -159,7 +159,7 @@ app.use("/", async (req: Request, res: Response) => {
 	const host = `${scheme}://${req.get("Host")}`;
 	const ref = host + req.originalUrl;
 
-	if (host && ref && false) {
+	if (host && ref) {
 		const link = `${host}/services/oembed?url=${encodeURIComponent(ref)}`;
 		res.set(
 			"Link",

src/utils.ts

@@ -1,5 +1,5 @@
 import {Request, Response} from "express";
-
+import {instace} from "./index.js";
 interface ApiUrls {
 	api: string;
 	gateway: string;
@@ -19,10 +19,32 @@ interface Invite {
 	};
 }
 
-export async function getApiUrls(url: string): Promise<ApiUrls | null> {
+export async function getApiUrls(
+	url: string,
+	instances: instace[],
+	check = true,
+): Promise<ApiUrls | null> {
 	if (!url.endsWith("/")) {
 		url += "/";
 	}
+	if (check) {
+		let valid = false;
+		for (const instace of instances) {
+			const urlstr = instace.url || instace.urls?.api;
+			if (!urlstr) {
+				continue;
+			}
+			try {
+				if (new URL(urlstr).host === new URL(url).host) {
+					valid = true;
+					break;
+				}
+			} catch (e) {}
+		}
+		if (!valid) {
+			throw new Error("Invalid instance");
+		}
+	}
 	try {
 		const info: ApiUrls = await fetch(`${url}.well-known/spacebar`).then((res) => res.json());
 		const api = info.api;
@@ -42,7 +64,11 @@ export async function getApiUrls(url: string): Promise<ApiUrls | null> {
 	}
 }
 
-export async function inviteResponse(req: Request, res: Response): Promise<void> {
+export async function inviteResponse(
+	req: Request,
+	res: Response,
+	instances: instace[],
+): Promise<void> {
 	let url: URL;
 	try {
 		url = new URL(req.query.url as string);
@@ -53,7 +79,7 @@ export async function inviteResponse(req: Request, res: Response): Promise<void>
 	}
 
 	try {
-		if (url.pathname.startsWith("invite")) {
+		if (!url.pathname.startsWith("invite") && !url.pathname.startsWith("/invite")) {
 			throw new Error("Invalid invite URL");
 		}
 
@@ -63,7 +89,7 @@ export async function inviteResponse(req: Request, res: Response): Promise<void>
 			throw new Error("Instance not specified");
 		}
 
-		const urls = await getApiUrls(instance);
+		const urls = await getApiUrls(instance, instances);
 		if (!urls) {
 			throw new Error("Failed to get API URLs");
 		}