feat: schedule clean invitation

functions/index.js

@@ -1,6 +1,9 @@
 const functions = require('firebase-functions')
 const admin = require('firebase-admin')
 const sgMail = require('@sendgrid/mail')
+const schedule = require('./schedule')
+
+exports.cleanInvitation = schedule.cleanInvitation
 
 let config, url
 // any better way to do this?

functions/schedule.js

@@ -0,0 +1,25 @@
+const functions = require('firebase-functions')
+const admin = require('firebase-admin')
+
+exports.cleanInvitation = functions
+  .region('europe-west1')
+  .pubsub.schedule('0 15 * * *')
+  .timeZone('Europe/Copenhagen')
+  .onRun(() => {
+    const last_8_dates = [...Array(8)].map((_, i) => {
+      const day = new Date()
+      day.setDate(day.getDate() - i)
+      return day.toISOString().slice(0, 10)
+    })
+
+    const query = admin
+      .firestore()
+      .collection('invitations')
+      .where('date', 'not-in', last_8_dates)
+
+    query.get().then((querySnapshot) => {
+      querySnapshot.forEach((doc) => {
+        doc.ref.delete()
+      })
+    })
+  })