serverless.yml

service: firstApp

provider:
  name: aws
  runtime: nodejs12.x
  region: ${opt:region, 'ap-southeast-1'}
  iamRoleStatements:
  - Effect: "Allow"
    Action:
      - "s3:*"
    Resource: "arn:aws:s3:::myapp/*"

plugins:
  - serverless-offline


functions:
  hello:
    handler: handler.hello
    events:
      - http: ANY {proxy+}
          cors: true

resources:
  Resources:
    UploadBucket:
      Type: AWS::S3::Bucket
      Properties:
        BucketName: myapp
        AccessControl: PublicRead
        CorsConfiguration:
          CorsRules:
          - AllowedMethods:
            - GET
            - PUT
            - POST
            - HEAD
            AllowedOrigins:
            - "*"
            AllowedHeaders:
            - "*"