Add support for prefix/suffix filters on S3

@@ -41,6 +41,16 @@ class S3EventSource(kappa.event_source.base.EventSource):
                 }
             ]
         }
+
+        # Add S3 key filters
+        if 'key_filters' in self._config:
+          filters_spec = { 'Key' : { 'FilterRules' : [] } }
+          for filter in self._config['key_filters']:
+            if 'type' in filter and 'value' in filter and filter['type'] in ('prefix', 'suffix'):
+              rule = { 'Name' : filter['type'], 'Value' : filter['value'] }
+              filters_spec['Key']['FilterRules'].append(rule)
+          notification_spec['LambdaFunctionConfigurations'][0]['Filter'] = filters_spec
+
         try:
             response = self._s3.call(
                 'put_bucket_notification_configuration',

@@ -34,3 +34,8 @@ lambda:
       arn: arn:aws:s3:::test-1245812163
       events:
         - s3:ObjectCreated:*
+      key_filters:
+        - type: prefix
+          value: someprefix/
+        - type: suffix
+          value: .zip