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backend/venv/Lib/site-packages/celery/security/utils.py

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+"""Utilities used by the message signing serializer."""
+import sys
+from contextlib import contextmanager
+
+import cryptography.exceptions
+from cryptography.hazmat.primitives import hashes
+
+from celery.exceptions import SecurityError, reraise
+
+__all__ = ('get_digest_algorithm', 'reraise_errors',)
+
+
+def get_digest_algorithm(digest='sha256'):
+    """Convert string to hash object of cryptography library."""
+    assert digest is not None
+    return getattr(hashes, digest.upper())()
+
+
+@contextmanager
+def reraise_errors(msg='{0!r}', errors=None):
+    """Context reraising crypto errors as :exc:`SecurityError`."""
+    errors = (cryptography.exceptions,) if errors is None else errors
+    try:
+        yield
+    except errors as exc:
+        reraise(SecurityError,
+                SecurityError(msg.format(exc)),
+                sys.exc_info()[2])