AWSTemplateFormatVersion: '2010-09-09'
Description: This template creates the base lambda@edge function and deploys it. It does not deploy it to the edge.
Resources:
  RugbyOriginRequestEdgeaLambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Service:
            - edgelambda.amazonaws.com
            - lambda.amazonaws.com
          Action:
          - sts:AssumeRole
      Path: "/"
      ManagedPolicyArns:
      - "arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess"
      - "arn:aws:iam::aws:policy/AWSLambdaExecute"
  RugbyOriginRequestEdge:
    Type: AWS::Lambda::Function
    Properties:
      Code: 
        ZipFile: !Sub |
          var AWS = require('aws-sdk');
          const querystring = require('querystring');

          exports.handler = (event, context, callback) => {
              // This is how the request data is passed into the Lambda@Edge function
              var request = event.Records[0].cf.request;
              const qs = querystring.parse(request.querystring);
              
              if(qs.tables != 'current') {
                  // There's no need to process so pass through as a normal request to S3.
                  // Example: Additionally we can add a cache control header 
                  // to avoid caching the response if we want here (good for debugging)
                  request.headers["cache-control"] = [ 
                      { 
                          "key": "Cache-Control", 
                          "value": "max-age=0" // expire it immediately
                      } 
                  ];
                  callback(null, request);
              } else {
                  // TODO: Processing to create the JSON with the tables
              }
          };
      Handler: index.handler
      Role:
        Fn::GetAtt: 
        - RugbyOriginRequestEdgeaLambdaExecutionRole
        - "Arn"
      Runtime: "nodejs6.10"

Outputs:
  RugbyEdgeLambda:
    Value: !Ref RugbyOriginRequestEdge
  RugbyEdgeLambdaARN:
    Value: !GetAtt RugbyOriginRequestEdge.Arn