Added support for SSM get_parameters_by_path. (#1299)

* Added support for SSM get_parameters_by_path.

Signed-off-by: Kai Xia <xiaket@gmail.com>

* add logic to handle trailing '/'.

Also, fix pep8.

Signed-off-by: Kai Xia <kai.xia@sportsbet.com.au>

* add tests for parameter value in response.

Signed-off-by: Kai Xia <kai.xia@sportsbet.com.au>

moto/ssm/models.py

@@ -75,6 +75,21 @@ class SimpleSystemManagerBackend(BaseBackend):
                 result.append(self._parameters[name])
         return result
 
+    def get_parameters_by_path(self, path, with_decryption, recursive):
+        """Implement the get-parameters-by-path-API in the backend."""
+        result = []
+        # path could be with or without a trailing /. we handle this
+        # difference here.
+        path = path.rstrip('/') + '/'
+        for param in self._parameters:
+            if not param.startswith(path):
+                continue
+            if '/' in param[len(path) + 1:] and not recursive:
+                continue
+            result.append(self._parameters[param])
+
+        return result
+
     def get_parameter(self, name, with_decryption):
         if name in self._parameters:
             return self._parameters[name]

moto/ssm/responses.py

@@ -81,6 +81,25 @@ class SimpleSystemManagerResponse(BaseResponse):
                 response['InvalidParameters'].append(name)
         return json.dumps(response)
 
+    def get_parameters_by_path(self):
+        path = self._get_param('Path')
+        with_decryption = self._get_param('WithDecryption')
+        recursive = self._get_param('Recursive', False)
+
+        result = self.ssm_backend.get_parameters_by_path(
+            path, with_decryption, recursive
+        )
+
+        response = {
+            'Parameters': [],
+        }
+
+        for parameter in result:
+            param_data = parameter.response_object(with_decryption)
+            response['Parameters'].append(param_data)
+
+        return json.dumps(response)
+
     def describe_parameters(self):
         page_size = 10
         filters = self._get_param('Filters')