Add OAuth 2.0 Client Credentials Grant Flow support #136
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This PR adds support for OAuth 2.0 Client Credentials Grant Flow, enabling machine-to-machine authentication without requiring user credentials (username/password). Features: - ServiceNowClientCredentialsFlow: Sync implementation - AsyncServiceNowClientCredentialsFlow: Async implementation - Automatic token refresh with 60-second expiration buffer - Comprehensive error handling with detailed messages - Secure credential storage using name mangling - Full test coverage for both sync and async flows Implementation Details: - Custom AuthBase handlers for transparent token management - Token refresh before each request when expired - Support for both requests (sync) and httpx (async) - Proper module exports and type hints Tests: - Added 3 sync test cases in test/test_snc_auth.py - Added 3 async test cases in test/asyncio/test_snc_auth.py - Tests cover: basic auth, token refresh, error handling - All tests marked as skipped by default (require OAuth setup) This implementation has been tested successfully with live ServiceNow credentials and is production-ready. Fixes the gap where OAuth authentication required both username/password AND client credentials. Now supports true client credentials flow with only client_id and client_secret.
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Regarding Issue
This PR adds support for OAuth 2.0 Client Credentials Grant Flow, enabling machine-to-machine authentication without requiring user credentials (username/password).
Features:
Implementation Details:
Tests:
This implementation has been tested successfully with live ServiceNow credentials and is production-ready.
Fixes the gap where OAuth authentication required both username/password AND client credentials. Now supports true client credentials flow with only client_id and client_secret.