serverless.yml

service: my-service

frameworkVersion: ">=1.2.0 <2.0.0"

plugins:
  - serverless-s3-cloudfront-plugin

provider:
  name: aws
  runtime: nodejs8.10
  stage: ${opt:stage, 'staging'}
  region: us-east-2

custom:
  s3Bucket: my-service-${self:provider.stage}
  distFolder: build
  distroId: MyWebApp

resources:
  Resources:
    ## Specifying the S3 Bucket
    WebAppS3Bucket:
      Type: AWS::S3::Bucket
      Properties:
        BucketName: ${self:custom.s3Bucket}
        AccessControl: PublicRead
        WebsiteConfiguration:
          IndexDocument: index.html
          ErrorDocument: index.html
    ## Specifying the policies to make sure all files inside the Bucket are avaialble to CloudFront
    WebAppS3BucketPolicy:
      Type: AWS::S3::BucketPolicy
      Properties:
        Bucket:
          Ref: WebAppS3Bucket
        PolicyDocument:
          Statement:
            - Action:
                - s3:GetObject
              Effect: Allow
              Principal: "*"
              Sid: PublicReadGetObject
              Resource: arn:aws:s3:::${self:custom.s3Bucket}/*
            - Action: 
                - s3:*
              Effect: Deny
              Principal: "*"
              Condition:
                Bool:
                  aws:SecureTransport: false
              Resource: arn:aws:s3:::${self:custom.s3Bucket}/*
    ## Specifying the CloudFront Distribution to server your Web Application
    WebAppCloudFrontDistribution:
      Type: AWS::CloudFront::Distribution
      Properties:
        DistributionConfig:
          PriceClass: PriceClass_100 # PriceClass_100 | PriceClass_200 | PriceClass_All
          Origins:
            - DomainName: ${self:custom.s3Bucket}.s3.amazonaws.com
              ## An identifier for the origin which must be unique within the distribution
              Id: ${self:custom.distroId}
              CustomOriginConfig:
                HTTPPort: 80
                HTTPSPort: 443
                OriginProtocolPolicy: https-only
              ## In case you want to restrict the bucket access use S3OriginConfig and remove CustomOriginConfig
              # S3OriginConfig:
              #   OriginAccessIdentity: origin-access-identity/cloudfront/E127EXAMPLE51Z
          Enabled: 'true'
          ## Uncomment the following section in case you are using a custom domain
          # Aliases:
          # - mysite.example.com
          DefaultRootObject: index.html
          ## Since the Single Page App is taking care of the routing we need to make sure ever path is served with index.html
          ## The only exception are files that actually exist e.h. app.js, reset.css
          CustomErrorResponses:
            - ErrorCode: 404
              ResponseCode: 200
              ResponsePagePath: /index.html
          DefaultCacheBehavior:
            AllowedMethods:
              - DELETE
              - GET
              - HEAD
              - OPTIONS
              - PATCH
              - POST
              - PUT
            ## The origin id defined above
            TargetOriginId: ${self:custom.distroId}
            ## Defining if and how the QueryString and Cookies are forwarded to the origin which in this case is S3
            ForwardedValues:
              QueryString: 'false'
              Cookies:
                Forward: none
            ## The protocol that users can use to access the files in the origin. To allow HTTP use `allow-all`
            ViewerProtocolPolicy: redirect-to-https
          ## The certificate to use when viewers use HTTPS to request objects.
          ViewerCertificate:
            CloudFrontDefaultCertificate: 'true'
          ## Uncomment the following section in case you want to enable logging for CloudFront requests
          # Logging:
          #   IncludeCookies: 'false'
          #   Bucket: mylogs.s3.amazonaws.com
          #   Prefix: myprefix

  ## In order to print out the hosted domain via `serverless info -v` we need to define the DomainName output for CloudFormation
  Outputs:
    WebsiteDistribution:
      Value:
        'Fn::GetAtt': [ WebsiteDistribution, DomainName ]