pyas2lib

1.4.4 verified Mon Apr 27 auth: no python

Python library for building and parsing AS2 (Applicability Statement 2) messages. It supports encryption, signing, compression, and MDN (Message Disposition Notification). Current version 1.4.4, released occasionally.

pip install pyas2lib

Common errors

error ModuleNotFoundError: No module named 'pyas2lib' ↓

cause Library not installed

fix

pip install pyas2lib

error ValueError: missing field 'receiver' ↓

cause Required argument not provided to AS2Message.build()

fix

Ensure sender, receiver, subject, content are all passed

Warnings

breaking Python 3.6 support dropped in v1.4.0 ↓

fix Use Python 3.7+

gotcha AS2Message requires all four fields (sender, receiver, subject, content) on build; missing one raises ValueError ↓

fix Always provide all keyword arguments

deprecated AS2Server is deprecated in favor of AS2Server from pyas2lib.as2 ↓

fix Use from pyas2lib.as2 import AS2Server

Imports

AS2Message
```
from pyas2lib import AS2Message
```
AS2Mdn
```
from pyas2lib import AS2Mdn
```
AS2Server
```
from pyas2lib.as2 import AS2Server
```
Before 1.x, was in pyas2lib.server; now in as2 submodule

Quickstart

Creates a simple unsigned, unencrypted AS2 message.

from pyas2lib import AS2Message

# Build a message
msg = AS2Message()
msg.build(
    sender='as2://sender@domain',
    receiver='as2://receiver@domain',
    subject='Test',
    content=b'Hello AS2',
    content_type='application/octet-stream',
    sign=False,
    encrypt=False,
    compress=False,
)
signed_data = msg.to_bytes()
print(signed_data)