Add server endpoint to compare a list of user guilds to the registered bracket guilds

server/src/endpoints/site/guild_intersection.ts

@@ -0,0 +1,24 @@
+import { Request, ResponseToolkit } from "@hapi/hapi";
+import { config } from "@/main";
+
+export default {
+	method: `POST`, path: `/guilds/compare`,
+	options: {
+		auth: false,
+		cors: {
+			origin: [ `*` ],
+		},
+	},
+	async handler(request: Request, h: ResponseToolkit) {
+		let userGuilds = request.payload as Array<string>;
+		let registeredGuilds = [];
+
+		for (var gid in config.guilds) {
+			if (userGuilds.includes(gid)) {
+				registeredGuilds.push(gid);
+			};
+		};
+
+		return registeredGuilds;
+	},
+};