add basic awslambda get_policy

moto/awslambda/responses.py

@@ -57,6 +57,20 @@ class LambdaResponse(BaseResponse):
         else:
             raise ValueError("Cannot handle {0} request".format(request.method))
 
+    def policy(self, request, full_url, headers):
+        if request.method == 'GET':
+            return self._get_policy(request, full_url, headers)
+
+    def _get_policy(self, request, full_url, headers):
+        lambda_backend = self.get_lambda_backend(full_url)
+
+        path = request.path if hasattr(request, 'path') else request.path_url
+        function_name = path.split('/')[-2]
+        if lambda_backend.has_function(function_name):
+            return 200, {}, json.dumps(dict(Policy='test_policy'))
+        else:
+            return 404, {}, "{}"
+
     def _invoke(self, request, full_url):
         response_headers = {}
         lambda_backend = self.get_lambda_backend(full_url)

moto/awslambda/urls.py

@@ -12,5 +12,6 @@ url_paths = {
     r'{0}/(?P<api_version>[^/]+)/functions/(?P<function_name>[\w_-]+)/?$': response.function,
     r'{0}/(?P<api_version>[^/]+)/functions/(?P<function_name>[\w_-]+)/invocations/?$': response.invoke,
     r'{0}/(?P<api_version>[^/]+)/functions/(?P<function_name>[\w_-]+)/invoke-async/?$': response.invoke_async,
-    r'{0}/(?P<api_version>[^/]+)/tags/(?P<resource_arn>.+)': response.tag
+    r'{0}/(?P<api_version>[^/]+)/tags/(?P<resource_arn>.+)': response.tag,
+    r'{0}/(?P<api_version>[^/]+)/functions/(?P<function_name>[\w_-]+)/policy/?$': response.policy
 }

tests/test_awslambda/test_lambda.py

@@ -645,3 +645,26 @@ def test_get_function_created_with_zipfile():
             }
         },
     )
+
+@mock_lambda
+def get_function_policy():
+    conn = boto3.client('lambda', 'us-west-2')
+    zip_content = get_test_zip_file1()
+    result = conn.create_function(
+        FunctionName='testFunction',
+        Runtime='python2.7',
+        Role='test-iam-role',
+        Handler='lambda_function.handler',
+        Code={
+            'ZipFile': zip_content,
+        },
+        Description='test lambda function',
+        Timeout=3,
+        MemorySize=128,
+        Publish=True,
+    )
+
+    response = conn.get_policy(
+        FunctionName='testFunction'
+    )
+    assert response['Policy'] == 'test_policy'