serverless.yml

service: upload-to-s3
frameworkVersion: '3'

plugins:
  - serverless-offline
  - serverless-plugin-typescript
  - serverless-iam-roles-per-function

custom:
  fileUploadBucketName: ${self:service}-bucket-${self:provider.stage}
  serverless-offline:
    httpPort: 1337

provider:
  name: aws
  runtime: nodejs12.x
  profile: serverlessUser
  stage: dev
  region: ap-south-1

functions:
  hello:
    handler: src/lambda/hello.handler
    events:
      - http:
          path: /hello
          method: GET
          cors: true

  imageUpload:
    handler: src/lambda/imageUpload.handler
    events:
      - http:
          path: /imageUpload
          method: POST
          cors: true
    iamRoleStatements:
      - Effect: Allow
        Action:
          - s3:PutObjectAcl
          - s3:PutObject
        Resource: arn:aws:s3:::${self:custom.fileUploadBucketName}/*
    environment:
      FILE_UPLOAD_BUCKET_NAME: ${self:custom.fileUploadBucketName}

resources:
  Resources:
    FileBucket:
      Type: AWS::S3::Bucket
      Properties:
        BucketName: ${self:custom.fileUploadBucketName}
        AccessControl: PublicRead