Extension. COVID-19. Decode QR Green Pass. Certificate. Encode/Decode QR

Juan_Antonio · October 15, 2021, 2:19pm

Hello friends,

here an extension to decode the COVID-19 EU QR Certificate, also called QR Green Pass. It's a demo, have a Toast. I have published this extension on my website in Spanish and I adapt it to this Community.

0.- About EU QR Certificate. Green Pass.

In some European countries, those vaccinated against COVID-19 (also those who have been recovered and those who have undergone a test) are given a QR code called the EU QR Certificate or QR Green Pass.

In this QR code you will find data such as the user's name, their date of birth, when they were vaccinated, when the code expires, type of vaccine...
The code specifications are in this pdf document:
https://ec.europa.eu/health/sites/default/files/ehealth/docs/covid-certificate_json_specification_en.pdf

To decode the QR, we obtain its text that comes in BASE45 compressed with zlib and after other decodes we convert it into JSON

QR code Image -> QR DECODER -> QR-decoded string -> BASE45 decoder -> zlib compressed string -> COSE string -> CBOR decoder -> JSON file

Let's see this information: https://ehealth.vyncke.org/
Here is an example of data output: https://gir.st/blog/greenpass.html
The certificate can contain three types of data
r: if the patient has recovered.
t: if the patient has COVID test.
v: if the patient is vaccinated.
HERE QR EXAMPLES: In the following example we observe several QRs of the same person, but with different certificates, r, t and v.
https://github.com/eu-digital-green-certificates/dgc-testdata/tree/main/IT
To build the extension I have used this code:

https://gae-piaz.medium.com/decode-the-eu-green-pass-qrcode-using-java-b5654e55b0fc

github. com/GaetanoPiazzolla/greenpass-decode/blob/master/src/main/java/com/tano/green/Main.java

Juan_Antonio · October 15, 2021, 2:19pm

Juan_Antonio · October 15, 2021, 2:23pm

1.- Blocks.

Extension com.KIO4_QRGreenPass.aix.
http://kio4.com/appinventor/299F_extension_QRGreenPass.htm

The main block is TextQRGPToJson, the result of a QR scan, through the BarcodeScanner component, is inserted and the Json of the QR is obtained.
QRGPToJson block is similar to the previous one, but in this case a QR image located in the Image component is inserted.
QRToText, we put a QR of any type, it does not have to be Green Pass, and we obtain its text.
TextToBarCode, we insert a text and an Image component, we obtain the Bar Code 128 of that text.
TextToQR, we insert a text and an Image component, we obtain the QR of that text.
ImageToFile, converts an image located in an Image component to a file. Set the full path where we want to get that file, for example /storage/emulated/0/.../my_file.png

Juan_Antonio · October 15, 2021, 2:23pm

3.- Decode Image QR Green Pass to JSON. BarcodeScanner component.

p299F_QRGreenPass.aia (432.8 KB)

With BarcodeScanner component we scan a QR Green Pass and we get:

Juan_Antonio · October 15, 2021, 2:24pm

4.- Decode JSON.

qrgreenpass8

Split at { , } and get a list.

Then I look for the piece that contains the data.

Example of JSON, from https://gir.st/blog/greenpass.html

{-260: {1: {'dob': '1998-02-26', date of birth
            'nam': {'fn': 'Musterfrau-Gößinger', family name
                    'fnt': 'MUSTERFRAU<GOESSINGER',
                    'gn': 'Gabriele', given name
                    'gnt': 'GABRIELE'},
            'v': [{'ci': 'URN:UVCI:01:AT:10807843F94AEE0EE5093FBC254BD813#B', certificate ID
                   'co': 'AT', country of vaccination
                   'dn': 1, doses received
                   'dt': '2021-02-18', date of vaccination
                   'is': 'Ministry of Health, Austria', cert issuer
                   'ma': 'ORG-100030215', vaccine manufacturer
                   'mp': 'EU/1/20/1528', vaccine product id
                   'sd': 2, total number of doses
                   'tg': '840539006', targeted disease (COVID-19)
                   'vp': '1119349007'}], vaccine or prophylaxis
            'ver': '1.2.1'}}, schema version
 1: 'AT', QR code issuer
 4: 1624458597, QR code expiry
 6: 1624285797} QR code generated

Juan_Antonio · October 15, 2021, 2:51pm

5.- Scan QR with Camera component.

p299F_QRGreenPass_Camara.aia (432.8 KB)

Instead of using the BarcodeScanner, we can use the Camera component.
We TakePicture, place it in an Image1.Picture and by means of the QRGPToJson block we decode it to JSON.

Juan_Antonio · October 15, 2021, 3:00pm

6.- Other blocks.

With this extension you can also encode/decode QR.

Juan_Antonio · October 15, 2021, 3:14pm

Savvas_Mirazanasvili · November 12, 2021, 12:35pm

when a scan is been confermed then you post to alert your website . Why did you do that ???? can you please remove it pls we will appriciate ia so much and ou will help up pls

Savvas_Mirazanasvili · November 17, 2021, 12:33pm

is it possible to do the exacly oposid thing ???? text to qr

Juan_Antonio · November 17, 2021, 12:37pm

There is a TextToQR block

Savvas_Mirazanasvili · November 17, 2021, 4:44pm

it is not working would you mind making me a symple aia file pls you will help me

TIMAI2 · November 17, 2021, 4:54pm

There is a sample aia project above....

Savvas_Mirazanasvili · November 17, 2021, 4:55pm

i cannot do that action i put the following json code to encode it doesnt

exple what i use on the text to qr block and it is not working {-260: {1: {'dob': '1998-02-26', date of birth
'nam': {'fn': 'Musterfrau-Gößinger', family name
'fnt': 'MUSTERFRAU<GOESSINGER',
'gn': 'Gabriele', given name
'gnt': 'GABRIELE'},
'v': [{'ci': 'URN:UVCI:01:AT:10807843F94AEE0EE5093FBC254BD813#B', certificate ID
'co': 'AT', country of vaccination
'dn': 1, doses received
'dt': '2021-02-18', date of vaccination
'is': 'Ministry of Health, Austria', cert issuer
'ma': 'ORG-100030215', vaccine manufacturer
'mp': 'EU/1/20/1528', vaccine product id
'sd': 2, total number of doses
'tg': '840539006', targeted disease (COVID-19)
'vp': '1119349007'}], vaccine or prophylaxis
'ver': '1.2.1'}}, schema version
1: 'AT', QR code issuer
4: 1624458597, QR code expiry
6: 1624285797}

Savvas_Mirazanasvili · November 17, 2021, 5:04pm

it is not working

TIMAI2 · November 17, 2021, 5:16pm

What is not working?

Savvas_Mirazanasvili · November 17, 2021, 5:53pm

i can generate qr code but wen i scan it with covid scanner app it ses eerror it is not working

TIMAI2 · November 17, 2021, 6:36pm

We get the message, please stop spamming the community....

Taifun · November 17, 2021, 6:44pm

this is an output, but not an input json code...
see a correct example taken from here https://dgc.a-sit.at/ehn/

{
    "ver": "1.2.1",
    "nam": {
        "fn": "Musterfrau-G\u00f6\u00dfinger",
        "gn": "Gabriele",
        "fnt": "MUSTERFRAU<GOESSINGER",
        "gnt": "GABRIELE"
    },
    "dob": "1998-02-26",
    "v": [
        {
            "tg": "840539006",
            "vp": "1119349007",
            "mp": "EU\/1\/20\/1528",
            "ma": "ORG-100030215",
            "dn": 1,
            "sd": 2,
            "dt": "2021-02-18",
            "co": "AT",
            "is": "Ministry of Health, Austria",
            "ci": "URN:UVCI:01:AT:10807843F94AEE0EE5093FBC254BD813#B"
        }
    ]
}

Taifun

Savvas_Mirazanasvili · November 17, 2021, 8:19pm

It's not working