{"id":337,"library":"oauthlib","title":"OAuthLib: OAuth1 and OAuth2 Implementation for Python","description":"OAuthLib is a comprehensive, spec-compliant implementation of OAuth1 and OAuth2 request-signing logic for Python 3.8 and above. The current version is 3.3.1, released on March 27, 2026, with a regular release cadence for ongoing improvements and security updates.","status":"active","version":"3.3.1","language":"python","source_language":"en","source_url":"https://github.com/oauthlib/oauthlib","tags":["OAuth1","OAuth2","Python","Security","API","Authentication"],"install":[{"cmd":"pip install oauthlib","lang":"bash","label":"Install OAuthLib"}],"dependencies":[{"reason":"OAuthLib can be used with any HTTP library, but 'requests' is commonly used for making HTTP requests in Python applications.","package":"requests"}],"imports":[{"note":"Ensure correct import path to avoid ImportError.","symbol":"OAuth1Session","correct":"from oauthlib.oauth1 import OAuth1Session"}],"quickstart":{"code":"import os\nfrom oauthlib.oauth1 import OAuth1Session\n\n# Set up OAuth1Session with your credentials\noauth = OAuth1Session(client_key=os.environ.get('CLIENT_KEY'), client_secret=os.environ.get('CLIENT_SECRET'))\n\n# Make a request to a protected resource\nresponse = oauth.get('https://api.example.com/protected')\nprint(response.content)","lang":"python","description":"A basic example of using OAuthLib with OAuth1Session to make authenticated requests."},"warnings":[{"fix":"Update your import statements for 'OAuth1Session' (e.g., from 'oauthlib.oauth1' to 'oauthlib.oauth1.rfc5849'). Also, align other parts of your code with the new API changes introduced in version 3.0.0, referring to OAuthLib release notes and documentation.","message":"OAuthLib 3.0.0 introduced API-breaking changes, including the relocation of 'OAuth1Session' (e.g., to 'oauthlib.oauth1.rfc5849') and the removal of 'request' from 'confirm_redirect_uri'.","severity":"breaking","affected_versions":">=3.0.0"},{"fix":"Install the 'requests' library using 'pip install requests' if it's not already installed.","message":"Ensure that 'requests' is installed when using OAuthLib, as it is commonly used for making HTTP requests in Python applications.","severity":"gotcha","affected_versions":"all"},{"fix":"Update your import statement. If using `requests-oauthlib`, change `from oauthlib.oauth1 import OAuth1Session` to `from requests_oauthlib import OAuth1Session` (and ensure `requests-oauthlib` is installed). If using OAuthLib directly, change it to `from oauthlib.oauth1.rfc5849 import OAuth1Session`.","message":"The OAuth1Session class was relocated in OAuthLib version 3.0.0. It is no longer directly available under `oauthlib.oauth1` and must be imported from `oauthlib.oauth1.rfc5849` or `requests_oauthlib`.","severity":"breaking","affected_versions":">=3.0.0"}],"env_vars":null,"last_verified":"2026-05-12T13:09:38.260Z","next_check":"2026-06-26T00:00:00.000Z","problems":[{"fix":"Ensure that your web framework's session management is correctly configured and working across redirects (e.g., Flask sessions, Django sessions). Verify that the `state` parameter is consistently stored in the session before redirection to the OAuth provider and retrieved/validated upon callback. In Flask, ensure `client_id` and other sensitive configurations are loaded within the application context, not at module level, to prevent `None` values.","cause":"This error typically occurs in OAuth2 flows when the 'state' parameter, used for CSRF protection, sent in the initial authorization request does not match the 'state' parameter received in the callback response from the OAuth provider. This can be due to session issues (e.g., session not being saved or loaded correctly, especially across redirects or in production environments with misconfigured sessions), or issues with how the state is handled by the application or framework.","error":"oauthlib.oauth2.rfc6749.errors.MismatchingStateError: (mismatching_state) CSRF Warning! State not equal in request and response."},{"fix":"For local development, you can temporarily disable this check by setting the environment variable `OAUTHLIB_INSECURE_TRANSPORT=1` or by adding `os.environ['OAUTHLIB_INSECURE_TRANSPORT'] = '1'` in your Python code before making OAuth requests (never in production). For production behind a reverse proxy, ensure the proxy is correctly configured to forward the `X-Forwarded-Proto` header as `https` and that your web framework recognizes it.","cause":"OAuth 2.0 strictly requires the use of HTTPS for all communication to ensure security. This error arises when an OAuth2 request is attempted over an insecure HTTP connection, often during local development or when a reverse proxy (like Nginx or Cloudflare) terminates SSL but the application itself perceives the request as HTTP.","error":"oauthlib.oauth2.rfc6749.errors.InsecureTransportError: (insecure_transport) OAuth 2 MUST utilize https."},{"fix":"Ensure that authorization codes are exchanged for access/refresh tokens immediately after receipt and are not reused. If using refresh tokens, implement robust handling to acquire new ones when they expire and store them securely, making sure to discard old refresh tokens as they can often only be used once. Re-authenticate the user if the refresh token is no longer valid.","cause":"This error indicates that the authorization grant (e.g., authorization code or refresh token) provided is invalid, expired, or has been used previously. Authorization codes are typically short-lived and single-use, while refresh tokens can also expire or be revoked.","error":"oauthlib.oauth2.rfc6749.errors.InvalidGrantError: (invalid_grant) The user could not be authenticated as the grant is expired."},{"fix":"Install the `google-auth-oauthlib` package using pip: `pip install google-auth-oauthlib`. Ensure that you are installing it into the correct Python environment (e.g., your active virtual environment) and that the Python interpreter running your code is the one associated with that environment.","cause":"This is a common Python error indicating that the `google_auth_oauthlib` package, which leverages `oauthlib` for Google's OAuth 2.0 authentication flow, is not installed or not accessible in the current Python environment.","error":"ModuleNotFoundError: No module named 'google_auth_oauthlib'"}],"ecosystem":"pypi","meta_description":null,"install_score":0,"install_tag":"stale","quickstart_score":0,"quickstart_tag":"stale","pypi_latest":null,"install_checks":{"last_tested":"2026-05-12","tag":"stale","tag_description":"widespread failures or data too old to trust","results":[{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.10-slim","python_version":"3.10","os_libc":"slim (glibc)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.11-alpine","python_version":"3.11","os_libc":"alpine (musl)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.11-slim","python_version":"3.11","os_libc":"slim (glibc)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.12-alpine","python_version":"3.12","os_libc":"alpine (musl)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.12-slim","python_version":"3.12","os_libc":"slim (glibc)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.13-alpine","python_version":"3.13","os_libc":"alpine (musl)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.13-slim","python_version":"3.13","os_libc":"slim (glibc)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.9-alpine","python_version":"3.9","os_libc":"alpine (musl)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.9-slim","python_version":"3.9","os_libc":"slim (glibc)","variant":"default","exit_code":1,"wheel_type":null,"failure_reason":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null}]},"quickstart_checks":{"last_tested":"2026-04-23","tag":"stale","tag_description":"widespread failures or data too old to trust","results":[{"runtime":"python:3.10-alpine","exit_code":1},{"runtime":"python:3.10-slim","exit_code":1},{"runtime":"python:3.11-alpine","exit_code":1},{"runtime":"python:3.11-slim","exit_code":1},{"runtime":"python:3.12-alpine","exit_code":1},{"runtime":"python:3.12-slim","exit_code":1},{"runtime":"python:3.13-alpine","exit_code":1},{"runtime":"python:3.13-slim","exit_code":1},{"runtime":"python:3.9-alpine","exit_code":1},{"runtime":"python:3.9-slim","exit_code":1}]}}