AWS Lambda function to configure an Existing S3 Bucket

Lambda.yaml

LambdaFunction:
    Type: "AWS::Lambda::Function"
    DependsOn: SNSTopic
    Properties:
      Description: "Lambda function to modify the existing S3 bucket"
      Handler: index.handler
      Runtime: "nodejs4.3"
      Timeout: 300
      Role: !GetAtt [ LambdaFunctionRole, Arn ]
      Code:
        ZipFile:
          Fn::Join:
            - ''
            - - "var AWS      = require('aws-sdk'); \n"
              - "var response = require('cfn-response'); \n"
              - "var S3       = new AWS.S3(); \n"
              - "exports.handler = function(event, context) { \n"
              - " var params = { \n"
              - "   Bucket: '"
              - !Ref BucketName
              - "', \n"
              - "   NotificationConfiguration: { \n"
              - "     TopicConfigurations: [{ \n"
              - "       Events: [ 's3:ObjectCreated:*' ], \n"
              - "       TopicArn: '"
              - !Ref SNSTopic
              - "', \n"
              - "       Filter: { Key: { FilterRules: [{ \n"
              - "         Name: 'prefix', \n"
              - "         Value: '"
              - !Ref BucketFilePrefix
              - "' \n"
              - "       }] } } \n"
              - "     }] \n"
              - "   } \n"
              - " }; \n"
              - " S3.putBucketNotificationConfiguration(params, function(err, data) { \n"
              - "   if (err)  { response.send(event, context, response.FAILURE, {}); } \n"
              - "   else      { response.send(event, context, response.SUCCESS, {}); } \n"
              - " }); \n"
              - "}; \n"