1 files changed, 97 insertions, 0 deletions
diff --git a/azure/aria/aria-extension-cloudify/src/aria/aria/utils/validation.py b/azure/aria/aria-extension-cloudify/src/aria/aria/utils/validation.py
new file mode 100644
index 0000000..06989a7
--- /dev/null
+++ b/azure/aria/aria-extension-cloudify/src/aria/aria/utils/validation.py
@@ -0,0 +1,97 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License 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.
+
+"""
+Validation utilities.
+"""
+
+from .formatting import string_list_as_string
+
+
+class ValidatorMixin(object):
+    """
+    A mix0in that should be added to classes that require validating user input.
+    """
+
+    _ARGUMENT_TYPE_MESSAGE = '{name} argument must be {type} based, got {arg!r}'
+    _ARGUMENT_CHOICE_MESSAGE = '{name} argument must be in {choices}, got {arg!r}'
+
+    @classmethod
+    def validate_in_choice(cls, name, argument, choices):
+        """
+        Validate ``argument`` is in ``choices``
+        """
+        if argument not in choices:
+            raise TypeError(cls._ARGUMENT_CHOICE_MESSAGE.format(
+                name=name, choices=choices, arg=argument))
+
+    @classmethod
+    def validate_type(cls, argument_name, argument, expected_type):
+        """
+        Validate ``argument`` is a subclass of ``expected_type``
+        """
+        if not issubclass(argument, expected_type):
+            raise TypeError(cls._ARGUMENT_TYPE_MESSAGE.format(
+                name=argument_name, type=expected_type, arg=argument))
+
+    @classmethod
+    def validate_instance(cls, argument_name, argument, expected_type):
+        """
+        Validate ``argument`` is a instance of ``expected_type``
+        """
+        if not isinstance(argument, expected_type):
+            raise TypeError(cls._ARGUMENT_TYPE_MESSAGE.format(
+                name=argument_name, type=expected_type, arg=argument))
+
+    @classmethod
+    def validate_callable(cls, argument_name, argument):
+        """
+        Validate ``argument`` is callable
+        """
+        if not callable(argument):
+            raise TypeError(cls._ARGUMENT_TYPE_MESSAGE.format(
+                name=argument_name, type='callable', arg=argument))
+
+
+def validate_function_arguments(func, func_kwargs):
+    """
+    Validates all required arguments are supplied to ``func`` and that no additional arguments are
+    supplied.
+    """
+
+    _kwargs_flags = 8
+
+    has_kwargs = func.func_code.co_flags & _kwargs_flags != 0
+    args_count = func.func_code.co_argcount
+
+    # all args without the ones with default values
+    args = func.func_code.co_varnames[:args_count]
+    non_default_args = args[:len(args) - len(func.func_defaults)] if func.func_defaults else args
+
+    # Check if any args without default values is missing in the func_kwargs
+    for arg in non_default_args:
+        if arg not in func_kwargs:
+            raise ValueError(
+                'The argument "{arg}" is not provided and does not have a default value for '
+                'function "{func.__name__}"'.format(arg=arg, func=func))
+
+    # check if there are any extra kwargs
+    extra_kwargs = [arg for arg in func_kwargs.keys() if arg not in args]
+
+    # assert that the function has kwargs
+    if extra_kwargs and not has_kwargs:
+        raise ValueError("The following extra kwargs were supplied: {extra_kwargs}".format(
+            extra_kwargs=string_list_as_string(extra_kwargs)
+        ))