python3-openid

Warnings

• breaking The `python-openid` library (for Python 2) is distinct from `python3-openid` (for Python 3). While the internal `openid` package namespace is largely consistent, direct dependencies or custom integrations built for Python 2's `python-openid` will require careful migration.
  Fix: Ensure you are installing `python3-openid` on PyPI for Python 3 projects. Review any direct imports or interactions with the library's internal structure that might have changed between Python 2 and Python 3 standard library behavior.
• gotcha The default `openid.store.filestore.FileOpenIDStore` is not suitable for production environments. It lacks support for concurrency, distributed systems, and often requires specific file permissions, making it unreliable for web applications.
  Fix: For production, implement a custom store (inheriting from `openid.store.interface.OpenIDStore`) that uses a robust database (e.g., PostgreSQL, MySQL) or a distributed key-value store (e.g., Redis). Consider using existing community-contributed store implementations if available for your chosen backend.
• gotcha The OpenID 1.x/2.0 protocol, which `python3-openid` implements, is an older standard. For new authentication needs, consider modern alternatives like OpenID Connect (OIDC), which is built on OAuth 2.0 and offers more features, better security practices, and broader adoption.
  Fix: Evaluate your project's authentication requirements carefully. If OpenID 2.0 is specifically required for integration with existing providers, this library is appropriate. For new implementations, research OpenID Connect libraries and providers instead.

Install

• pip install python3-openid Install latest version

Imports

• Consumer

  from openid.consumer import consumer

  The 'consumer' module itself holds the Consumer class. Direct import from the module is generally preferred.
• Server

  from openid.server import server

  Similar to Consumer, the 'server' module holds the Server class.
• FileOpenIDStore

  from openid.store import filestore

  FileOpenIDStore is within the 'filestore' module of the 'store' package.

Quickstart

This quickstart demonstrates initiating an OpenID consumer authentication flow. It initializes a Consumer object with a file-based store (not for production) and attempts to begin an authentication request for a placeholder OpenID URL. In a real web application, the `auth_request.redirectURL` would be used to redirect the user's browser to the OpenID Provider.

import os
from openid.consumer import consumer
from openid.store import filestore

# Create a file store for nonces and associations (NOT suitable for production)
store_path = "openid_store"
os.makedirs(store_path, exist_ok=True)
store = filestore.FileOpenIDStore(store_path)

# Initialize the consumer
oid_consumer = consumer.Consumer(store)

# Example: Begin OpenID authentication (conceptual example for a web app flow)
# In a real web application, this would involve user input and HTTP redirects.
user_openid_url = "https://openid.example.com/user/alice" # Replace with an actual OpenID Provider URL

try:
    # This call prepares an authentication request.
    # The actual redirect to the OpenID Provider (OP) happens in a web framework.
    auth_request = oid_consumer.begin(user_openid_url)
    
    # Simulate the redirect URL generation (in a real app, this would be returned to the client)
    return_to_url = 'http://localhost:8000/verify'
    trust_root = 'http://localhost:8000'
    
    print(f"OpenID authentication initiated for {user_openid_url}")
    print(f"User should be redirected to: {auth_request.redirectURL(return_to_url, trust_root)}")
    
except consumer.DiscoveryFailure as e:
    print(f"OpenID discovery failed for {user_openid_url}: {e}")
except Exception as e:
    print(f"An unexpected error occurred: {e}")

# For demonstration purposes, you might clean up the store directory
# import shutil
# shutil.rmtree(store_path)