feat: start basis of new web ui system on CRA

packages/api/handlers/bot-join.ts

@@ -0,0 +1,36 @@
+import { Bounce } from '../utils/bounce';
+import { botClientID } from '../utils/config';
+
+const validGuildID = /^[0-9]+$/;
+
+type URLParams = {
+    clientID: string;
+    permissions: number;
+    guildID?: string;
+};
+
+const buildURL = (params: URLParams) => {
+    let url = `https://discord.com/api/oauth2/authorize?client_id=${params.clientID}&scope=bot&permissions=${params.permissions}`;
+
+    if (params.guildID) {
+        url += `&guild_id=${params.guildID}&disable_guild_select=true`;
+    }
+
+    return url;
+};
+
+export const BotJoin = (request: Request): Response => {
+    let guildID = new URL(request.url).searchParams.get('guild') || '';
+
+    if (guildID && !validGuildID.test(guildID)) {
+        guildID = '';
+    }
+
+    return Bounce(
+        buildURL({
+            clientID: botClientID,
+            permissions: 268435456,
+            guildID,
+        })
+    );
+};