Cloudformation config to set up Lambda signaling service for webrtc

signaling-servier-cloudformation.yml

YWebRtcTopicsTable:
  Type: AWS::DynamoDB::Table
  Properties:
    KeySchema:
      - AttributeName: name
        KeyType: HASH
    AttributeDefinitions:
      - AttributeName: name
        AttributeType: S
    ProvisionedThroughput:
      ReadCapacityUnits: 5
      WriteCapacityUnits: 5
    Tags:
      - Key: Name
        Value: y-webrtc-topics-table

YWebRtcApi:
  Type: AWS::ApiGatewayV2::Api
  Properties:
    Name: ywebrtc-api
    ProtocolType: WEBSOCKET
    RouteSelectionExpression: "$request.body.type"

YWebRtcIntegration:
  Type: AWS::ApiGatewayV2::Integration
  Properties:
    ApiId: !Ref YWebRtcApi
    Description: y-webrtc signaling integration
    IntegrationType: AWS_PROXY
    IntegrationUri: !Sub arn:${AWS::Partition}:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${YWebRtcSignalingLambdaFunction.Arn}/invocations

YWebRtcConnectRoute:
  Type: AWS::ApiGatewayV2::Route
  Properties:
    ApiId: !Ref YWebRtcApi
    RouteKey: $connect
    AuthorizationType: NONE
    OperationName: ConnectRoute
    Target: !Join
      - '/'
      - - 'integrations'
        - !Ref YWebRtcIntegration
YWebRtcDisconnectRoute:
  Type: AWS::ApiGatewayV2::Route
  Properties:
    ApiId: !Ref YWebRtcApi
    RouteKey: $disconnect
    AuthorizationType: NONE
    OperationName: DisconnectRoute
    Target: !Join
      - '/'
      - - 'integrations'
        - !Ref YWebRtcIntegration
YWebRtcDefaultRoute:
  Type: AWS::ApiGatewayV2::Route
  Properties:
    ApiId: !Ref YWebRtcApi
    RouteKey: $default
    AuthorizationType: NONE
    OperationName: DefaultRoute
    Target: !Join
      - '/'
      - - 'integrations'
        - !Ref YWebRtcIntegration

YWebRtcDeployment:
  Type: AWS::ApiGatewayV2::Deployment
  DependsOn:
    - YWebRtcConnectRoute
    - YWebRtcDisconnectRoute
    - YWebRtcDefaultRoute
  Properties:
    ApiId: !Ref YWebRtcApi

YWebRtcApiStage:
  Type: AWS::ApiGatewayV2::Stage
  Properties:
    StageName: dev
    DeploymentId: !Ref YWebRtcDeployment
    ApiId: !Ref YWebRtcApi

YWebRtcInvokePermission:
  Type: AWS::Lambda::Permission
  Properties:
    Action: lambda:InvokeFunction
    FunctionName: !Ref YWebRtcSignalingLambdaFunction
    Principal: apigateway.amazonaws.com

YWebRtcApiCertificate:
  Type: AWS::CertificateManager::Certificate
  Properties:
    DomainName: !Sub 'webrtc.${Domain}'
    DomainValidationOptions:
      - DomainName: !Sub 'webrtc.${Domain}'
        HostedZoneId: !Ref HostedZoneId
    ValidationMethod: DNS

YWebRtcApiDomainName:
  Type: AWS::ApiGatewayV2::DomainName
  Properties:
    DomainName: !Sub 'webrtc.${Domain}'
    DomainNameConfigurations:
      - CertificateArn: !Ref YWebRtcApiCertificate
        SecurityPolicy: TLS_1_2

YWebRtcApiMapping:
  Type: AWS::ApiGatewayV2::ApiMapping
  Properties:
    ApiId: !Ref YWebRtcApi
    DomainName: !Sub 'webrtc.${Domain}'
    Stage: !Ref YWebRtcApiStage
  DependsOn:
    - YWebRtcApiDomainName

YWebRtcApiRecordSet:
  Type: AWS::Route53::RecordSet
  Properties:
    AliasTarget:
      DNSName: !GetAtt YWebRtcApiDomainName.RegionalDomainName
      HostedZoneId: !GetAtt YWebRtcApiDomainName.RegionalHostedZoneId
    # See https://forums.aws.amazon.com/thread.jspa?threadID=103919: The `HostedZoneName` requires the trailing dot.
    HostedZoneName: !Sub '${Domain}.'
    Name: !Sub 'webrtc.${Domain}'
    Type: A