From b921a3fe9fc981faa377ff3fdf5ac25ad8b391b0 Mon Sep 17 00:00:00 2001
From: Alexander Horn <alexhorn@users.noreply.github.com>
Date: Sat, 9 Jan 2021 15:00:47 +0100
Subject: [PATCH] Add /api/mensa endpoint

---
 rogue-thi-app/package-lock.json  | 13 +++++++++++++
 rogue-thi-app/package.json       |  3 ++-
 rogue-thi-app/pages/api/mensa.js | 31 +++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 rogue-thi-app/pages/api/mensa.js

diff --git a/rogue-thi-app/package-lock.json b/rogue-thi-app/package-lock.json
index 355ab8b8..41b0872a 100644
--- a/rogue-thi-app/package-lock.json
+++ b/rogue-thi-app/package-lock.json
@@ -5427,6 +5427,11 @@
         }
       }
     },
+    "sax": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
+      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw=="
+    },
     "scheduler": {
       "version": "0.20.1",
       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.20.1.tgz",
@@ -7080,6 +7085,14 @@
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
+    "xml-js": {
+      "version": "1.6.11",
+      "resolved": "https://registry.npmjs.org/xml-js/-/xml-js-1.6.11.tgz",
+      "integrity": "sha512-7rVi2KMfwfWFl+GpPg6m80IVMWXLRjO+PxTq7V2CDhoGak0wzYzFgUY2m4XJ47OGdXd8eLE8EmwfAmdjw7lC1g==",
+      "requires": {
+        "sax": "^1.2.4"
+      }
+    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
diff --git a/rogue-thi-app/package.json b/rogue-thi-app/package.json
index e8290953..6fc18b42 100644
--- a/rogue-thi-app/package.json
+++ b/rogue-thi-app/package.json
@@ -22,7 +22,8 @@
     "react-bootstrap": "^1.4.0",
     "react-dom": "^17.0.1",
     "react-leaflet": "^3.0.5",
-    "react-placeholder": "^4.0.3"
+    "react-placeholder": "^4.0.3",
+    "xml-js": "^1.6.11"
   },
   "devDependencies": {
     "eslint": "^7.15.0",
diff --git a/rogue-thi-app/pages/api/mensa.js b/rogue-thi-app/pages/api/mensa.js
new file mode 100644
index 00000000..e6330333
--- /dev/null
+++ b/rogue-thi-app/pages/api/mensa.js
@@ -0,0 +1,31 @@
+import xmljs from 'xml-js'
+import MemoryCache from '../../lib/memory-cache'
+
+const CACHE_TTL = 60 * 60 * 1000
+const URL_DE = 'https://www.max-manager.de/daten-extern/sw-erlangen-nuernberg/xml/mensa-ingolstadt.xml'
+const URL_EN = 'https://www.max-manager.de/daten-extern/sw-erlangen-nuernberg/xml/en/mensa-ingolstadt.xml'
+
+const cache = new MemoryCache({ ttl: CACHE_TTL })
+
+async function fetchPlan (lang) {
+  const url = (lang || 'de') === 'de' ? URL_DE : URL_EN
+
+  let plan = cache.get(url)
+
+  if (!plan) {
+    const resp = await fetch(url)
+    plan = xmljs.xml2js(await resp.text(), { compact: true })
+
+    cache.set(url, plan)
+  }
+
+  return plan
+}
+
+export default async function handler (req, res) {
+  const plan = await fetchPlan(req.query.lang)
+
+  res.statusCode = 200
+  res.setHeader('Content-Type', 'application/json')
+  res.end(JSON.stringify(plan))
+}