将存储桶策略附加到无服务器生成的存储桶

Question

我正在尝试使用serverless创建一个S3存储桶，这是可行的，但是为了操作其中的文件，我需要一个存储桶策略。我很难理解在哪里以及如何添加使用第一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

我尝试了在互联网上找到的各种组合，并将其添加到serverless.yml文件的iamroles属性中，但似乎没有任何效果

Answer 1

资源引用名称似乎很重要，我总是必须在资源名称中使用存储桶的名称。例如，包含www.example.com的存储桶需要引用名称S3BucketWwwexamplecom。

但是，我也注意到您的示例中缺少BucketName元素。

这来自一个具有Bucket策略的静态网站的工作示例：

resources:
  Resources:
    S3BucketWwwexamplecom:
      Type: AWS::S3::Bucket
      DeletionPolicy: Delete
      Properties:
        BucketName: ${self:custom.s3WwwBucket}
        CorsConfiguration:
          CorsRules:
            - AllowedMethods:
                - PUT
                - GET
                - POST
                - HEAD
              AllowedOrigins:
                - "https://${self:custom.myDomain}"
              AllowedHeaders:
                - "*"
        AccessControl: PublicRead
        WebsiteConfiguration:
          IndexDocument: index.html
    BucketPolicyWwwexamplecom:
      Type: 'AWS::S3::BucketPolicy'
      Properties:
        PolicyDocument:
          Statement:
            - Sid: PublicReadForGetBucketObjects
              Effect: Allow
              Principal: '*'
              Action:
                - 's3:GetObject'
              Resource: arn:aws:s3:::${self:custom.s3WwwBucket}/*
        Bucket:
          Ref: S3BucketWwwexamplecom

Answer 2

由于您使用lambda上传，因此应为Lambda创建IAM角色，并创建仅具有操作所需权限的IAM策略。您可以通过在云形成中使用以下摘录来实现这一点：

AWSTemplateFormatVersion: '2010-09-09'
Description: My Template
Resources:    
  LambdaRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Service: lambda.amazonaws.com
          Action: sts:AssumeRole
      RoleName: !Sub ${AWS::StackName}-LambdaRole

  S3Policy:
    Type: AWS::IAM::Policy
    Properties:
      PolicyName: S3_Writer
      PolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Action:
            - s3:*
          Resource: !Sub
            - arn:aws:s3:::${BucketName}/*
            - BucketName: !Ref NametagsDatabaseBucket
      Roles:
        - !Ref TaskRole
Outputs:
  LambdaRole:
    Value: !Sub "${LambdaRole.Arn}"
    Export:
      Name: !Sub ${AWS::StackName}-LambdaRole

然后，在您的serverless.yml中，只需引用使用以下代码创建的任务角色即可引用执行角色：

service: vcc-nametags-api

provider:
  role: ${cf:${env:YOUR_STACK_ENV, 'YOUR_STACK_NAME'}.LambdaRole}

我们有一个这样的设置在几个项目中工作，我希望它对你工作。