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/*
Fosscord: A FOSS re-implementation and extension of the Discord.com backend.
Copyright (C) 2023 Fosscord and Fosscord Contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import express, { Application } from "express";
import fs from "fs";
import path from "path";
import fetch, { Response as FetchResponse } from "node-fetch";
import ProxyAgent from "proxy-agent";
import { Config } from "@fosscord/util";
const ASSET_FOLDER_PATH = path.join(__dirname, "..", "..", "..", "assets");
export default function TestClient(app: Application) {
app.use("/assets", express.static(path.join(ASSET_FOLDER_PATH, "public")));
app.use("/assets", express.static(path.join(ASSET_FOLDER_PATH, "cache")));
// Test client is disabled, so don't need to run any more. Above should probably be moved somewhere?
if (!Config.get().client.useTestClient) {
app.get("*", (req, res) => {
return res.redirect("/api/ping");
});
return;
}
const agent = new ProxyAgent();
let html = fs.readFileSync(
path.join(ASSET_FOLDER_PATH, "client_test", "index.html"),
{ encoding: "utf-8" },
);
html = applyEnv(html); // update window.GLOBAL_ENV according to config
html = applyPlugins(html); // inject our plugins
app.use(
"/assets/plugins",
express.static(path.join(ASSET_FOLDER_PATH, "plugins")),
);
app.use(
"/assets/inline-plugins",
express.static(path.join(ASSET_FOLDER_PATH, "inline-plugins")),
);
// Asset memory cache
const assetCache = new Map<
string,
{ response: FetchResponse; buffer: Buffer }
>();
// Fetches uncached ( on disk ) assets from discord.com and stores them in memory cache.
app.get("/assets/:file", async (req, res) => {
delete req.headers.host;
if (req.params.file.endsWith(".map")) return res.status(404);
let response: FetchResponse;
let buffer: Buffer;
const cache = assetCache.get(req.params.file);
if (!cache) {
response = await fetch(
`https://discord.com/assets/${req.params.file}`,
{
agent,
headers: { ...(req.headers as { [key: string]: string }) },
},
);
buffer = await response.buffer();
} else {
response = cache.response;
buffer = cache.buffer;
}
[
"content-length",
"content-security-policy",
"strict-transport-security",
"set-cookie",
"transfer-encoding",
"expect-ct",
"access-control-allow-origin",
"content-encoding",
].forEach((headerName) => {
response.headers.delete(headerName);
});
response.headers.forEach((value, name) => res.set(name, value));
assetCache.set(req.params.file, { buffer, response });
// TODO: I don't like this. Figure out a way to get client cacher to download *all* assets.
if (response.status == 200) {
console.warn(
`[TestClient] Cache miss for file ${req.params.file}! Use 'npm run generate:client' to cache and patch.`,
);
await fs.promises.appendFile(
path.join(ASSET_FOLDER_PATH, "cacheMisses"),
req.params.file + "\n",
);
}
return res.send(buffer);
});
// Instead of our generated html, send developers.html for developers endpoint
app.get("/developers*", (req, res) => {
res.set("Cache-Control", "public, max-age=" + 60 * 60 * 24); // 24 hours
res.set("content-type", "text/html");
res.send(
fs.readFileSync(
path.join(ASSET_FOLDER_PATH, "client_test", "developers.html"),
{ encoding: "utf-8" },
),
);
});
// Send our generated index.html for all routes.
app.get("*", (req, res) => {
res.set("Cache-Control", "public, max-age=" + 60 * 60 * 24); // 24 hours
res.set("content-type", "text/html");
if (req.url.startsWith("/api") || req.url.startsWith("/__development"))
return;
return res.send(html);
});
}
// Apply gateway/cdn endpoint values from config to index.html.
const applyEnv = (html: string): string => {
const config = Config.get();
const cdn = (
config.cdn.endpointClient ||
config.cdn.endpointPublic ||
process.env.CDN ||
""
).replace(/(https?)?(:\/\/?)/g, "");
const gateway =
config.gateway.endpointClient ||
config.gateway.endpointPublic ||
process.env.GATEWAY ||
"";
if (cdn) html = html.replace(/CDN_HOST: .+/, `CDN_HOST: \`${cdn}\`,`);
if (gateway)
html = html.replace(
/GATEWAY_ENDPOINT: .+/,
`GATEWAY_ENDPOINT: \`${gateway}\`,`,
);
return html;
};
// Injects inline, preload, and standard plugins into index.html.
const applyPlugins = (html: string): string => {
// Inline plugins. Injected as <script src="/assets/inline-plugins/name.js"> into head.
const inlineFiles = fs.readdirSync(
path.join(ASSET_FOLDER_PATH, "inline-plugins"),
);
const inline = inlineFiles
.filter((x) => x.endsWith(".js"))
.map((x) => `<script src="/assets/inline-plugins/${x}"></script>`)
.join("\n");
html = html.replace("<!-- inline plugin marker -->", inline);
// Preload plugins. Text content of each plugin is injected into head.
const preloadFiles = fs.readdirSync(
path.join(ASSET_FOLDER_PATH, "preload-plugins"),
);
const preload = preloadFiles
.filter((x) => x.endsWith(".js"))
.map(
(x) =>
`<script>${fs.readFileSync(
path.join(ASSET_FOLDER_PATH, "preload-plugins", x),
)}</script>`,
)
.join("\n");
html = html.replace("<!-- preload plugin marker -->", preload);
// Normal plugins. Injected as <script src="/assets/plugins/name.js"> into body.
const pluginFiles = fs.readdirSync(path.join(ASSET_FOLDER_PATH, "plugins"));
const plugins = pluginFiles
.filter((x) => x.endsWith(".js"))
.map((x) => `<script src="/assets/plugins/${x}"></script>`)
.join("\n");
html = html.replace("<!-- plugin marker -->", plugins);
return html;
};
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