lemmy-ui/src/server/handlers/manifest-handler.ts

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import type { Request, Response } from "express";
import { LemmyHttp } from "lemmy-js-client";
import { getHttpBaseInternal } from "../../shared/env";
import { wrapClient } from "../../shared/services/HttpService";
import generateManifestJson from "../utils/generate-manifest-json";
import { setForwardedHeaders } from "../utils/set-forwarded-headers";
let manifest: Awaited<ReturnType<typeof generateManifestJson>> | undefined =
undefined;
export default async (req: Request, res: Response) => {
if (!manifest) {
const headers = setForwardedHeaders(req.headers);
const client = wrapClient(new LemmyHttp(getHttpBaseInternal(), headers));
const site = await client.getSite({});
if (site.state === "success") {
manifest = await generateManifestJson(site.data);
} else {
res.sendStatus(500);
return;
}
}
res.setHeader("content-type", "application/manifest+json");
res.send(manifest);
};