django-walletpass

django-walletpass

This application implements the creation of signed .pkpass files and API endpoints for pass registration, updates and logging.

Features

• Build .pkpass with the PassBuilder class
• Sign .pkpass with SMIME (as apple describes in their documentation)
• Server implementation for store, registration, update and logging
• Push notifications (APNs) on pass update
• Individual storage backend setting
• Support for mime-type upload using django-storages S3

Requirements

• Django >=3.2.9
• Python >= 3.10
• pyca/cryptography (for .pkpass SMIME sign)
• djangorestframework >= 3.8

Getting Started

Install

$ pip install django-walletpass

Configure

Add 'django_walletpass' to you installed apps in the settings.py file.

Load the content of your cert.pem and key.pem in your settings.py file. This is required for signing the .pkpass file.

WALLETPASS = {
    'CERT_PATH': 'path/to/your/cert.pem',
    'KEY_PATH': 'path/to/your/key.pem',
    # (None if isn't protected)
    # MUST be in bytes-like
    'KEY_PASSWORD': b'1234',
}

Add extra needed conf to your settings.py file.

WALLETPASS = {
    'CERT_PATH': 'path/to/your/cert.pem',
    'KEY_PATH': 'path/to/your/key.pem',
    # (None if isn't protected)
    # MUST be in bytes-like
    'KEY_PASSWORD': b'1234',

    'PASS_TYPE_ID': 'pass.io.develat.devpubs.example',
    'TEAM_ID': '123456',
    'SERVICE_URL': 'https://example.com/passes/',
}

Add token JWT config data to allow APNs push:

WALLETPASS = {
    'PUSH_AUTH_STRATEGY': 'token',
    'TOKEN_AUTH_KEY_PATH': 'path/to/your/key.p8',
    'TOKEN_AUTH_KEY_ID': 'key_id',

    'PASS_TYPE_ID': 'pass.io.develat.devpubs.example',
    'TEAM_ID': '123456',
    'SERVICE_URL': 'https://example.com/passes/',
}

You should also import the urls into your site urls.

urlpatterns = [
    url(r'^api/passes/', include('django_walletpass.urls')),

django-walletpass signals certain events that might come handy in your application.

from django_walletpass.classviews import PASS_REGISTERED, PASS_UNREGISTERED

@receiver(PASS_REGISTERED)
def pass_registered(sender, **kwargs):
    pass

@receiver(PASS_UNREGISTERED)
def pass_unregistered(sender, **kwargs):
    pass

Signal TOKEN_UNREGISTERED has a default handler. It can be disconnected and replaced.

Configure storage and upload path (optional)

Default: DEFAULT_FILE_STORAGE

WALLETPASS_CONF = {
    # Defaults to DEFAULT_FILE_STORAGE
    'STORAGE_CLASS': 'my.custom.storageclass,
    'UPLOAD_TO': 'passes'
    'STORAGE_BACKEND': 's3storage'  # Dj4.2+ only
}

STORAGE_BACKEND is the key of the django settings STORAGES storage config. e.g

STORAGES['s3storage']['BACKEND'] = 'some.s3.backend.class'

Push notifications sandbox (optional)

Default: False

WALLETPASS_CONF = {
    'PUSH_SANDBOX': False,
}

CA certificates path (optional)

WALLETPASS_CONF = {
    # Cert in pem format.
    'APPLE_WWDRCA_PEM_PATH': 'path/to/cert.pem',
}

Redirect to pass url (optional)

Usefull if you are using django-storages and you want to serve your .pkpass files from s3.

Default: False

WALLETPASS_CONF = {
    STORAGE_HTTP_REDIRECT: True,
}

Build and sign passes

Init builder object:

Init empty builder

from django_walletpass.models import PassBuilder
builder = PassBuilder()

Init builder usign a directory as base

from django_walletpass.models import PassBuilder
builder = PassBuilder(directory='/path/to/your.pass/')

If the base directory contains a pass.json it will be loaded, but remember that required attributes of pass.json will be overwritten during build process using this values:

{
    "passTypeIdentifier": WALLETPASS_CONF['PASS_TYPE_ID'],
    "serialNumber": secrets.token_urlsafe(20),
    "teamIdentifier": WALLETPASS_CONF['TEAM_ID'],
    "webServiceURL": WALLETPASS_CONF['SERVICE_URL'],
    "authenticationToken": crypto.gen_random_token(),
}

Handle pass.json data

To handle pass.json data, there is a dict inside your builder instance, you can manage it like a normal python dictionary.

Update some attrs:

builder.pass_data.update({
  "barcode": {
    "message": "123456789",
    "format": "PKBarcodeFormatPDF417",
    "messageEncoding": "iso-8859-1"
  },
  "organizationName": "Organic Produce",
  "description": "Organic Produce Loyalty Card",
})

Update one attr:

builder.pass_data['description'] = "Organic Produce Loyalty Card"

Overwrite automatically generated required attribute values

builder.pass_data_required.update({
    "passTypeIdentifier": "customvalue",
    "serialNumber": "customvalue",
    "teamIdentifier": "customvalue",
    "webServiceURL": "customvalue",
    "authenticationToken": "customvalue",
})

you can overwrite individual attributes:

builder.pass_data_required.update({
    "serialNumber": "customvalue",
})
builder.pass_data_required['serialNumber] = 'cutomvalue'

Add extra files

file_content = open('myfile', 'rb').read()
builder.add_file('image.png', file_content)

You can also add files to directories:

file_content = open('myfile', 'rb').read()
builder.add_file('en.lproj/pass.strings', file_content)

Build .pkpass

Build the content of .pkpass

pkpass_content = builder.build()

Write to file:

pkpass_file = open('mypass.pkpass', 'wb')
pkpass_file.write(pkpass_content)

Save to new record in DB:

pass_instance = builder.write_to_model()
pass_instance.save()

Save to existent record in DB:

builder.write_to_model(pass_instance)
pass_instance.save()

Load .pkpass from DB and update

builder = pass_instance.get_pass_builder()
builder.pass_data.update({'field': 'value'})
builder.build()
builder.save_to_db(pass_instance)

Run tests locally

Checkout source and run from source root directory

docker run -it --rm -v "$(pwd):/app" python:3.8 bash -c "cd /app; python setup.py install; ./example/manage.py test django_walletpass"