Feature: iCal link

api/migrations/43-ical-link.sql

@@ -0,0 +1,5 @@
+ALTER TABLE ctfnote.settings
+  ADD COLUMN "ical_password" TEXT DEFAULT encode(gen_random_bytes(16), 'hex');
+
+GRANT SELECT ("ical_password") ON ctfnote.settings TO user_guest;
+

api/package.json

@@ -27,6 +27,7 @@
     "graphile-utils": "^4.13.0",
     "graphql": "^16.6.0",
     "graphql-upload-ts": "^2.0.5",
+    "ical-generator": "^3.2.1",
     "postgraphile": "^4.13.0",
     "postgraphile-plugin-connection-filter": "^2.3.0",
     "postgres-migrations": "^5.3.0"

api/src/index.ts

@@ -14,6 +14,8 @@ import createTasKPlugin from "./plugins/createTask";
 import importCtfPlugin from "./plugins/importCtf";
 import uploadLogoPlugin from "./plugins/uploadLogo";
 import uploadScalar from "./plugins/uploadScalar";
+import { Pool } from "pg";
+import { icalRoute } from "./routes/ical";
 import ConnectionFilterPlugin from "postgraphile-plugin-connection-filter";
 
 function getDbUrl(role: "user" | "admin") {
@@ -75,6 +77,10 @@ function createOptions() {
 }
 
 function createApp(postgraphileOptions: PostGraphileOptions) {
+  const pool = new Pool({
+    connectionString: getDbUrl("user"),
+  });
+
   const app = express();
   app.use(graphqlUploadExpress());
   app.use(
@@ -85,7 +91,8 @@ function createApp(postgraphileOptions: PostGraphileOptions) {
       },
     })
   );
-  app.use(postgraphile(getDbUrl("user"), "ctfnote", postgraphileOptions));
+  app.use(postgraphile(pool, "ctfnote", postgraphileOptions));
+  app.use("/calendar.ics", icalRoute(pool));
   return app;
 }
 

api/src/routes/ical.ts

@@ -0,0 +1,66 @@
+import { ICalCalendar } from "ical-generator";
+import { Request, Response, Handler } from "express";
+import { Pool } from "pg";
+
+type CtfRow = {
+  id: number;
+  title: string;
+  start_time: string;
+  end_time: string;
+  ctf_url: string;
+  description: string;
+};
+
+type IcalPasswordRow = {
+  ical_password: string;
+};
+
+export function icalRoute(pool: Pool): Handler {
+  async function checkIcalPassword(
+    userPass: string | undefined
+  ): Promise<boolean> {
+    const r = await pool.query<IcalPasswordRow>(
+      "SELECT ical_password FROM ctfnote.settings"
+    );
+    const db_password = r.rows[0].ical_password;
+    // If the password is null or empty allow any user
+    if (!db_password) return true;
+    return db_password === userPass;
+  }
+
+  async function getCtfs(): Promise<CtfRow[]> {
+    const r = await pool.query<CtfRow>(
+      "SELECT id, title, start_time, end_time, ctf_url, description FROM ctfnote.ctf"
+    );
+
+    return r.rows;
+  }
+
+  return async function (req: Request, res: Response): Promise<void> {
+    const { key } = req.query;
+
+    if (
+      !(typeof key == "string" || key == undefined) ||
+      !(await checkIcalPassword(key))
+    ) {
+      res.status(403);
+      res.send("Forbidden\n");
+      return;
+    }
+
+    const cal = new ICalCalendar();
+    const ctfs = await getCtfs();
+
+    for (const ctf of ctfs) {
+      cal.createEvent({
+        start: ctf.start_time,
+        end: ctf.end_time,
+        description: ctf.description,
+        summary: ctf.title,
+        url: ctf.ctf_url,
+      });
+    }
+
+    cal.serve(res);
+  };
+}