Remove "attributes" from EncryptionContext str/repr

CHANGELOG.rst

@@ -2,13 +2,15 @@
 Changelog
 *********
 
-1.1.2 -- 2019-09-??
+1.1.2 -- 2019-10-??
 ===================
 
 Bugfixes
 --------
 * Fix :class:`AwsKmsCryptographicMaterialsProvider` regional clients override bug
   `#124 <https://github.com/aws/aws-dynamodb-encryption-python/issues/124>`_
+* Remove ``attributes`` attribute from :class:`EncryptionContext` ``str`` and ``repr`` values.
+  `#127 <https://github.com/aws/aws-dynamodb-encryption-python/issues/127>`_
 
 1.1.1 -- 2019-08-29
 ===================

src/dynamodb_encryption_sdk/structures.py

@@ -68,6 +68,7 @@ class EncryptionContext(object):
         validator=attr.validators.optional(attr.validators.instance_of(six.string_types)), default=None
     )
     attributes = attr.ib(
+        repr=False,
         validator=(dictionary_validator(six.string_types, dict), _validate_attribute_values_are_ddb_items),
         default=attr.Factory(dict),
     )

test/unit/test_structures.py

@@ -0,0 +1,26 @@
+# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"). You
+# may not use this file except in compliance with the License. A copy of
+# the License is located at
+#
+# http://aws.amazon.com/apache2.0/
+#
+# or in the "license" file accompanying this file. This file is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+# ANY KIND, either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.
+"""Unit tests for ``dynamodb_encryption_sdk.structures``."""
+import pytest
+
+from dynamodb_encryption_sdk.structures import EncryptionContext
+
+
+@pytest.mark.parametrize("operator", (repr, str))
+def test_encryption_context_repr(operator):
+    value = EncryptionContext(attributes={"unique_name": {"S": "unique_value"}})
+
+    test = operator(value)
+
+    assert "unique_name" not in test
+    assert "unique_value" not in test