singpass-client 0.1.1

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Singpass OAuth Client

Description

A lightweight Python client for integrating with Singpass' OAuth2 endpoints. This client helps:

• Generate Singpass authorization URLs
• Exchange authorization codes for tokens
• Decrypt and verify ID and access tokens
• Retrieve and verify user info from Singpass

Note: This library does not handle session management out of the box.

It is built around the official Singpass standards and uses JOSE for handling JWTs and JWKs.

Usage

import asyncio
from singpass_client.client import SingpassOauthClient

# Load Singpass discovery data (usually from the Singpass metadata URL)
discovery = {
    "issuer": "https://stg-id.singpass.gov.sg",
    "authorization_endpoint": "https://stg-id.singpass.gov.sg/auth",
    "jwks_uri": "https://stg-id.singpass.gov.sg/.well-known/keys",
    "userinfo_endpoint": "https://stg-id.singpass.gov.sg/userinfo",
}

# Initialize the client
client = SingpassOauthClient(discovery=discovery, client_id="YOUR_CLIENT_ID", scope="openid")

# Step 1: Generate the authorization URL
auth_url, code_verifier, nonce, state = client.create_authorization_url(
    redirect_uri="https://yourapp.com/callback"
)

print("Visit this URL to authenticate:", auth_url)

# After redirection, handle the callback with the returned `code`
# Step 2: Exchange code for tokens
async def exchange_code():
    token_set = await client.handle_callback(
        nonce=nonce,
        code_verifier=code_verifier,
        authorization_code="AUTHORIZATION_CODE_FROM_CALLBACK",
        key_file_path="path/to/your_private_jwks.json",
        sig_key_id="your-signing-key-id",
        en_key_id="your-encryption-key-id"
    )

    access_token = token_set["access_token"]

    # Step 3: Retrieve and verify user info
    user_info = await client.get_info(
        access_token=access_token,
        en_key_id="your-encryption-key-id",
        key_file_path="path/to/your_private_jwks.json",
        nonce=nonce
    )

    print("User info:", user_info)

# Run the async flow
asyncio.run(exchange_code())