From 73a36afa4ae2f43e1185a71334049531d7bc2873 Mon Sep 17 00:00:00 2001
From: Philipp Opheys <philipp@opheys.dev>
Date: Mon, 14 Oct 2024 11:48:28 +0200
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20add=20ical=20API=20back=20(#423)?=
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---
 rogue-thi-app/pages/api/cl-events.js | 71 ++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 rogue-thi-app/pages/api/cl-events.js

diff --git a/rogue-thi-app/pages/api/cl-events.js b/rogue-thi-app/pages/api/cl-events.js
new file mode 100644
index 00000000..48541fc8
--- /dev/null
+++ b/rogue-thi-app/pages/api/cl-events.js
@@ -0,0 +1,71 @@
+import NeulandAPI from '../../lib/backend/neuland-api'
+import ical from 'ical-generator'
+
+/**
+ * Sends a HTTP response as JSON.
+ * @param {object} res Next.js response object
+ * @param {number} status HTTP status code
+ * @param {object} body Response body
+ */
+function sendJson(res, status, body) {
+  res.statusCode = status
+  res.setHeader('Content-Type', 'application/json')
+  res.end(JSON.stringify(body))
+}
+
+/**
+ * Sends a HTTP response as iCal.
+ * @param {object} res Next.js response object
+ * @param {number} status HTTP status code
+ * @param {object} body Response body
+ */
+function sendCalendar(res, status, body) {
+  res.statusCode = status
+  res.setHeader('Content-Type', 'text/calendar')
+  res.end(body.toString())
+}
+
+export default async function handler(req, res) {
+  function isCalRequest() {
+    const accept = req.headers.accept || ''
+    const format = req.query.format || 'json'
+    return accept.includes('text/calendar') || format === 'ical'
+  }
+
+  const plan = await NeulandAPI.getCampusLifeEvents()
+
+  if (isCalRequest()) {
+    const cal = ical({ name: 'Campus Life' })
+      .timezone('Europe/Berlin')
+      .ttl(60 * 60 * 24)
+    for (const event of plan.clEvents) {
+      const start = new Date(Number(event.begin))
+
+      // discard the end if it is before the start
+      const end =
+        event.end > event.begin ? new Date(Number(event.end)) : undefined
+
+      cal.createEvent({
+        id: event.id,
+        summary: event.title,
+        description: `Veranstalter: ${event.organizer}`,
+        location: event.location,
+        start,
+        end,
+      })
+    }
+    sendCalendar(res, 200, cal)
+    return
+  }
+
+  sendJson(res, 200, [
+    {
+      id: 'deprecation',
+      organizer: 'Neuland e.V.',
+      title: 'Neuland REST API is deprecated',
+      begin: '2024-01-01T00:00:00.000Z',
+      end: '2026-01-01T00:00:00.000Z',
+      location: null,
+    },
+  ])
+}