aws-sam-lambda-edge-webp.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: Rewrite jpg and png requests to webp if the browser supports webp
Resources:
  ViewerRequestFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: s3://lambda-compressed-file-storage/viewer-request-function.zip
      FunctionName: ViewerRequestFunction
      Handler: handler.handler
      Runtime: nodejs10.x
      MemorySize: 128
      Timeout: 1
      Role: !GetAtt WebEdgeLambdaRole.Arn

  ViewerRequestFunctionVersion:
    Type: "AWS::Lambda::Version"
    Properties:
      FunctionName: !Ref ViewerRequestFunction
      Description: "A version of ViewerRequestFunction"

  OriginResponseFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: s3://lambda-compressed-file-storage/origin-response-function.zip
      FunctionName: OriginResponseFunction
      Handler: handler.handler
      Runtime: nodejs10.x
      MemorySize: 512
      Timeout: 5
      Role: !GetAtt WebEdgeLambdaRole.Arn

  OriginResponseFunctionVersion:
    Type: "AWS::Lambda::Version"
    Properties:
      FunctionName: !Ref OriginResponseFunction
      Description: "A version of OriginResponseFunction"

  # ==== ROLES ==== #
  WebEdgeLambdaRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          -
            Effect: Allow
            Action: sts:AssumeRole
            Principal:
              Service:
                - "lambda.amazonaws.com"
                - "edgelambda.amazonaws.com"
  # ==== POLICIES ==== #
  PublishLogsPolicy:
    Type: AWS::IAM::ManagedPolicy
    Properties:
      Description: Allows functions to write logs
      Roles:
      - !Ref WebEdgeLambdaRole
      PolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Action:
            - logs:CreateLogGroup
            - logs:CreateLogStream
            - logs:PutLogEvents
            Resource: '*'