serverless.yml

service: aws-java-simple-http-endpoint

frameworkVersion: ">=1.2.0 <2.0.0"

plugins:
  - serverless-apigw-binary

custom:
  bucketName: "s3-proxy-tutorial-destination"
  tableName: "s3-proxy-tutorial-metadata"
  apigwBinary:
    types:           #list of mime-types
      - '*/*'

provider:
  name: aws
  region: us-east-2
  runtime: java11
  iamRoleStatements: # permissions for all of your functions can be set here
    - Effect: Allow
      Action: # Gives permission to S3 bucket
        - s3:ListBucket
      Resource: { 'Fn::Join': ['', ['arn:aws:s3:::', { 'Ref': 'storageBucket' }]] }
    - Effect: Allow
      Action: # Gives permission to S3 bucket
        - s3:PutObject
      Resource  : { 'Fn::Join': ['', ['arn:aws:s3:::', { 'Ref': 'storageBucket' }, '/*']] }
    - Effect: Allow
      Action: # Gives permission to dynamo tables in a specific region
        - dynamodb:PutItem
      Resource: { 'Fn::Join': ['', ['arn:aws:dynamodb:', { Ref: 'AWS::Region' }, ':', {  Ref: 'AWS::AccountId' }, ':table/', { 'Ref': 'metadataTable' }]] }

package:
  artifact: build/libs/s3-proxy-all.jar

functions:
  s3-proxy:
    handler: com.bcchapman.Handler
    environment:
      BUCKET_NAME: { 'Ref': 'storageBucket' }
      TABLE_NAME: { 'Ref': 'metadataTable' }
    events:
      - http:
          path: createFile
          method: post
          request:
            parameters:
              querystrings:
                filePath: true

resources:
  Resources:
    storageBucket:
      Type: AWS::S3::Bucket
      Properties:
        BucketName: ${self:custom.bucketName}
    metadataTable:
      Type: AWS::DynamoDB::Table
      Properties:
        AttributeDefinitions:
          - AttributeName: user
            AttributeType: S
          - AttributeName: path
            AttributeType: S
        KeySchema:
          - AttributeName: user
            KeyType: HASH
          - AttributeName: path
            KeyType: RANGE
        BillingMode:
          PAY_PER_REQUEST
        ProvisionedThroughput:
          ReadCapacityUnits: 0
          WriteCapacityUnits: 0
        TableName: ${self:custom.tableName}