Add list_exports to CloudFormationResponse

moto/cloudformation/models.py

@@ -206,6 +206,17 @@ class CloudFormationBackend(BaseBackend):
                 if stack.name == name_or_stack_id:
                     self.delete_stack(stack.stack_id)
 
+    def list_exports(self, token):
+        all_exports = [x for x in self.exports.values()]
+        if token is None:
+            exports = all_exports[0:100]
+            next_token = '100' if len(all_exports) > 100 else None
+        else:
+            token = int(token)
+            exports = all_exports[token:token + 100]
+            next_token = str(token + 100) if len(all_exports) > token + 100 else None
+        return exports, next_token
+
 
 cloudformation_backends = {}
 for region in boto.cloudformation.regions():

moto/cloudformation/responses.py

@@ -210,6 +210,12 @@ class CloudFormationResponse(BaseResponse):
             template = self.response_template(DELETE_STACK_RESPONSE_TEMPLATE)
             return template.render()
 
+    def list_exports(self):
+        token = self._get_param('NextToken')
+        exports, next_token = self.cloudformation_backend.list_exports(token=token)
+        template = self.response_template(LIST_EXPORTS_RESPONSE)
+        return template.render(exports=exports, next_token=next_token)
+
 
 CREATE_STACK_RESPONSE_TEMPLATE = """<CreateStackResponse>
   <CreateStackResult>
@@ -410,3 +416,23 @@ DELETE_STACK_RESPONSE_TEMPLATE = """<DeleteStackResponse>
   </ResponseMetadata>
 </DeleteStackResponse>
 """
+
+LIST_EXPORTS_RESPONSE = """<ListExportsResponse xmlns="http://cloudformation.amazonaws.com/doc/2010-05-15/">
+  <ListExportsResult>
+    <Exports>
+      {% for export in exports %}
+      <member>
+        <ExportingStackId>{{ export.exporting_stack_id }}</ExportingStackId>
+        <Name>{{ export.name }}</Name>
+        <Value>{{ export.value }}</Value>
+      </member>
+      {% endfor %}
+    </Exports>
+    {% if next_token %}
+    <NextToken>{{ next_token }}</NextToken>
+    {% endif %}
+  </ListExportsResult>
+  <ResponseMetadata>
+    <RequestId>5ccc7dcd-744c-11e5-be70-example</RequestId>
+  </ResponseMetadata>
+</ListExportsResponse>"""