将存储桶策略附加到无服务器生成的存储桶

问：

我正在尝试使用无服务器创建一个 S3 存储桶，它可以工作，但是为了操作其中的文件，我需要一个存储桶策略。我很难理解在何处以及如何添加使用首次无服务器部署时创建的生成的 S3bucket 名称的策略

##serverless.yml##

service: vcc-nametags-api

# Use the serverless-webpack plugin to transpile ES6
plugins:
  - serverless-webpack
  - serverless-offline
  - serverless-ding

# serverless-webpack configuration
# Enable auto-packing of external modules
custom:
  # Our stage is based on what is passed in when running serverless
  # commands. Or fallsback to what we have set in the provider section.
  stage: ${opt:stage, self:provider.stage}
  # Set our DynamoDB throughput for prod and all other non-prod stages.
  # Load our webpack config
  webpack:
    webpackConfig: ./webpack.config.js
    includeModules: true
  environment: ${file(env.yml):${self:custom.stage}, file(env.yml):default}

provider:
  name: aws
  runtime: nodejs8.10
  stage: dev
  region: us-east-1

  # These environment variables are made available to our functions
  # under process.env.
  environment:
    S3DBBucketName:
      Ref: NametagsDatabaseBucket

functions:
  # Defines an HTTP API endpoint that calls the main function in create.js
  # - path: url path is /tags
  # - method: POST request
  # - cors: enabled CORS (Cross-Origin Resource Sharing) for browser cross
  #     domain api call
  # - authorizer: authenticate using the AWS IAM role
  create:
    handler: create.main
    events:
      - http:
          path: tags
          method: post
          cors: true

  get:
    # Defines an HTTP API endpoint that calls the main function in get.js
    # - path: url path is /tags/{id}
    # - method: GET request
    handler: get.main
    events:
      - http:
          path: tags/{id}
          method: get
          cors: true

  list:
    # Defines an HTTP API endpoint that calls the main function in list.js
    # - path: url path is /tags
    # - method: GET request
    handler: list.main
    events:
      - http:
          path: tags
          method: get
          cors: true

  update:
    # Defines an HTTP API endpoint that calls the main function in update.js
    # - path: url path is /tags/{id}
    # - method: PUT request
    handler: update.main
    events:
      - http:
          path: tags/{id}
          method: put
          cors: true

  delete:
    # Defines an HTTP API endpoint that calls the main function in delete.js
    # - path: url path is /tags/{id}
    # - method: DELETE request
    handler: delete.main
    events:
      - http:
          path: tags/{id}
          method: delete
          cors: true
# Create our resources with separate CloudFormation templates
resources:
  # S3DB
  - ${file(resources/s3-database.yml)}

##s3-database.yml##

Resources:
  NametagsDatabaseBucket:
    Type: AWS::S3::Bucket
    Properties:
      # Set the CORS policy
      CorsConfiguration:
        CorsRules:
          -
            AllowedOrigins:
              - '*'
            AllowedHeaders:
              - '*'
            AllowedMethods:
              - GET
              - PUT
              - POST
              - DELETE
              - HEAD
            MaxAge: 3000
  NametagsDatabaseBucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket:
        Ref: NametagsDatabaseBucket
      PolicyDocument:
        Statement:
          - Sid: PublicReadGetObject
            Effect: Allow
            Principal: "*"
            Action:
            - "s3:DeleteObject"
            - "s3:GetObject"
            - "s3:ListBucket"
            - "s3:PutObject"
            Resource:
              Fn::Join: [
                "", [
                  "arn:aws:s3:::",
                  {
                    "Ref": "NametagsDatabaseBucket"
                  },
                  "/*"
                ]
              ]

# Print out the name of the bucket that is created
Outputs:
  NametagsDatabaseBucketName:
    Value:
      Ref: NametagsDatabaseBucket

我已经尝试了在互联网上找到的各种组合，并将其添加到文件中的属性中，但我似乎无法使任何事情正常工作iamrolesserverless.yml