Visitors can only warn each other with the same QR code.įrom an Application-Developers point of view, special care must be taken to decide if and when QR codes should beĬhanged. However, a new QR code should only be generated when no visitor is at the event or location, because The moreįrequent QR codes are updated, the more difficult it is to keep a central database with venue data up-to-date. To mitigate the risk, CWA encourages owners to regularly generate new QR codes for their venues. Use with caution & read below! If unsure, leave blank.Īn adversary can collect this information for a single venue by scanning the QR code and extracting and storing theĭata. seed: Seed to rotate the QR-Code, Optional, or None (Default).default_check_in_length_in_minutes: Default Check-out time in minutes, Optional.location_type: Type of the Location, Optional, one of.For repeating Events useĬwa_qr.rollover_date to get a defined rollover. Do not use datetime.now() for start/end-date. end_date_time: End of the Event, Optional, datetime in UTCĬaution, QR-Codes generated with different start/end times will have different Event-IDs and not warn users that.start_date_time: Start of the Event, Optional, datetime in UTC.location_address: Address of the Location, Optional, String, max 100 Characters.location_description: Description of the Location, Optional, String, max 100 Characters.See example_full.py for an example using all features. make_image( fill_color = 'black', back_color = 'white') default_check_in_length_in_minutes = 4 * 60 # Renew QR-Code every night at 4:00 seed_date = event_description. location_address = 'Gau-Odernheim' event_description. location_description = 'Zuhause' event_description. #!/usr/bin/env python3 from datetime import datetime, time, timezone import cwa_qr # Construct Event-Descriptor event_description = cwa_qr.

Corona renderer default 60