VerificaC19 Python SDK

🐍 VerificaC19 SDK implementation for Python.

Requirements

• Python version >= 3.7
• MongoDB version >= 5.x (used to store CRL)

Make sure zbar is installed in your system. Source.

• For Mac OS X, it can be installed via brew install zbar
• Debian systems via apt install libzbar0
• Fedora / Red Hat dnf install zbar

Install

pip install verificac19

Usage

Download and cache rules, CRL data and DSCs

You can download and cache rules, CRL Data and DSCs using service.

from verificac19 import service

service.update_all()

update_all may rise VerificaC19Error

from verificac19.exceptions import VerificaC19Error

⚠️ By default rules and DSCs will be cached in local folder, to change it please set VC19_CACHE_FOLDER env variable.

⚠️ CRL data will be stored in a MongoDB database. By default the connection string is mongodb://root:example@localhost:27017/VC19?authSource=admin, if you want to change it, set VC19_MONGODB_URL env variable.

Verify a DCC

You can verify a DCC using verifier. You can verify a DCC using verify_image for images and verify_raw for raw data.

from verificac19 import verifier

result = verifier.verify_image("my_dcc.png")
result = verifier.verify_raw("HC1:GH.....1GH")

verify_image and verify_raw return a dictionary containing person name, date_of_birth, code and a message alongside the result

{
  'code': verifier.Codes.NOT_VALID, 
  'result': False, 
  'message': 'Certificate is not valid', 
  'person': 'Sčasný Svätozár', 
  'date_of_birth': '1984-09-27'
}

you can compare the resulting code with verifier.Codes values

	Code	Description	Result
✅	VALID	Certificate is valid	True
⚠️	TEST_NEEDED	Test needed if verification mode is BOOSTER_DGP	False
❌	NOT_VALID	Certificate is not valid	False
❌	NOT_VALID_YET	Certificate is not valid yet	False
❌	REVOKED	Certificate is revoked	False
❌	NOT_EU_DCC	Certificate is not an EU DCC	False

for example

result = verifier.verify_image("my_dcc.png")
assert result['code'] == verifier.Codes.NOT_VALID

⚠️ verify_image and verify_raw may rise VerificaC19Error in case you cache is not initialized. You need to call service.update_all() at least once!

Verification mode

If you want to change verification mode and verify whether a certificate is a Super Green Pass or not, you need to pass verifier.Mode.SUPER_DGP to verify_image and verify_raw methods.

from verificac19 import verifier

result = verifier.verify_image("my_dcc.png", verifier.Mode.SUPER_DGP)

verifier.Mode exposes 2 possible values

Code	Description
NORMAL_DGP	Normal verification (default value)
SUPER_DGP	Super Green Pass verification
BOOSTER_DGP	Booster verification mode

Details

• SUPER_DGP Mode: VerificaC19 SDK considers a green certificate valid only for people who have been vaccinated against or who have recovered from Covid19, and will prevent all the others from entering bars, restaurants, cinemas, gyms, theatres, discos and stadiums.

• BOOSTER_DGP Mode: VerificaC19 SDK considers green certificates generated after a booster dose to be valid. Furthermore, green certificates generated after the first vaccination cycle or recovery with the simultaneous presentation of a digital document certifying the negative result of a SARS-CoV-2 test are considered valid.

Development

Install dev dependencies

pip install -r requirements-dev.txt

Make sure zbar is installed in your system. Source.

• For Mac OS X, it can be installed via brew install zbar
• Debian systems via apt install libzbar0
• Fedora / Red Hat dnf install zbar

CRL data will be stored in a MongoDB database. This repository provides a simple docker-compose.yml file (dev instance) with a replica set. By default the connection string is mongodb://root:example@localhost:27017/VC19?authSource=admin, if you want to change it, set VC19_MONGODB_URL env variable.

Run tests

make test

Run examples

python -m examples.<example_name>

Authors

Copyright (c) 2022 - Lotrèk Digital Agency

Contributors

Thank you to everyone involved for improving this project, day by day.

License

This library is available under the MIT license.