Add automatic entry deletion after a specified amount of time.

config.ini

@@ -4,6 +4,9 @@
 # Remove or leave empty for temporary (/tmp/ftracker-db.json) storage
 db_file = db.json
 
+# Delete all information after X days (e.g. for GDPR compliance)
+delete_after_days = 28
+
 # List of people to be allowed, in .csv format (comma, no delimiters)
 # Col1: First Name(s), Col2: Last Name(s), Col3 (optional): EMail
 # Remove or leave empty for no check

ftracker/core.py

@@ -1,3 +1,4 @@
+import atexit
 import json
 from datetime import datetime
 from slugify import slugify
@@ -21,6 +22,17 @@ from flask import Flask, request, redirect
 app = Flask(__name__, static_folder='../web')
 
 
+if config['delete_after_days']:
+	from .deleter import Deleter
+	deleter = Deleter(db, int(config['delete_after_days']))
+
+def shutdown():
+	print('\rReceived stop signal, stopping threads...')
+	deleter.stop()
+	db.close()
+
+atexit.register(shutdown)
+
 @app.route('/guidelines')
 def get_guidelines():
 	dest = config['guideline_url'] or None

ftracker/deleter.py

@@ -0,0 +1,42 @@
+from threading import Thread, Event
+from datetime import datetime, timedelta
+
+from tinydb import Query
+
+ONE_DAY_IN_S = 24 * 60 * 60
+
+class Deleter(Thread):
+
+	def delete_old_entries(self):
+
+		print('Clearing database of old entries...')
+
+		td = timedelta(days=self.days)
+
+		threshold = datetime.utcnow() - td
+
+		iso = threshold.isoformat() + 'Z'
+
+		Entry = Query()
+		self.db.remove((Entry.arrival < iso))
+
+		print('Deleted everything until UTC', iso)
+
+	def __init__(self, db, days):
+
+		self.db = db
+		self.days = days
+
+		self.delete_old_entries()
+
+		Thread.__init__(self, daemon=True)
+		self.stopped = Event()
+		self.start()
+
+	def run(self):
+
+		while not self.stopped.wait(ONE_DAY_IN_S):
+			self.delete_old_entries()
+
+	def stop(self):
+		self.stopped.set()

web/view.html

@@ -322,7 +322,11 @@
 
 			}
 
-			document.querySelector('input#end').value = localISOTimeMinutes(new Date())
+			var now = new Date()
+			var startDate = new Date()
+			startDate.setDate(now.getDate() - (4*7))
+			document.querySelector('input#start').value = localISOTimeMinutes(startDate)
+			document.querySelector('input#end').value = localISOTimeMinutes(now)
 
 			var scrollbox = document.querySelector('.scroll')
 			var timehead = document.querySelector('#timeheader')