Question

我试图用无服务器创建一个S3存储桶，该服务器可以工作，但是为了操作其中的文件，我需要一个存储桶策略。我很难理解在哪里以及如何添加使用首次部署无服务器时创建的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

我尝试了各种在互联网上找到的组合，并将其添加到iamroles文件中的serverless.yml属性中，但似乎无法正常工作

Answer 1

资源引用名称似乎很重要，我一直不得不在资源名称中使用存储桶的名称。例如，带有www.example.com的存储桶需要引用名称为S3BucketWwwexamplecom。

不过，我还注意到您的示例中缺少BucketName元素。

这来自具有桶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

由于您使用的是Lambda上载，因此您应该为Lambda创建一个IAM角色以及一个仅具有操作所需权限的IAM策略。您可以通过在云计算中使用以下摘录来完成此操作：

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serverless.yml中仅引用使用类似以下内容创建的任务角色来引用执行角色：

service: vcc-nametags-api

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

我们有一个类似这样的设置可以在多个项目中使用，希望它对您有用。

将存储桶策略附加到由无服务器生成的存储桶

`serverless.yml`

`s3-database.yml`

2 个答案: