Chat/Authorization.yml at main · LambdaSharp/Chat · GitHub

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# Cognito Authentication
- Resource: UserPool
  Type: AWS::Cognito::UserPool
  Properties:
    AliasAttributes:
      - email
      - preferred_username
    AutoVerifiedAttributes:
      - email
    EmailVerificationSubject: "Your λ# chat verification code"
    Schema:
      - Name: email
        AttributeDataType: String
        Mutable: false
        Required: true
    UsernameConfiguration:
      CaseSensitive: false
    UserPoolTags:
      "LambdaSharp:Module": !Ref Module::FullName
      "LambdaSharp:Stack": !Ref AWS::StackName

- Resource: UserPoolClient
  Type: AWS::Cognito::UserPoolClient
  Properties:
    AllowedOAuthFlows:
      - code
    AllowedOAuthFlowsUserPoolClient: true
    AllowedOAuthScopes:
      - openid
    CallbackURLs:
      - !Ref WebsiteLoginUrl
    ExplicitAuthFlows:
      - ALLOW_USER_SRP_AUTH
      - ALLOW_REFRESH_TOKEN_AUTH
    GenerateSecret: false
    LogoutURLs:
      - !Sub "https://${WebsiteCloudFront.DomainName}/logout"
    PreventUserExistenceErrors: ENABLED
    RefreshTokenValidity: 7 # days
    SupportedIdentityProviders:
      - COGNITO
    UserPoolId: !Ref Authorization::UserPool

- Resource: UserPoolDomain
  Type: AWS::Cognito::UserPoolDomain
  Properties:
    Domain: !Select [ 2, !Split [ "/", !Ref AWS::StackId ]]
    UserPoolId: !Ref Authorization::UserPool

- Variable: Issuer
  Value: !GetAtt Authorization::UserPool.ProviderURL

- Variable: ClientId
  Value: !Ref Authorization::UserPoolClient

- Variable: UserPoolUri
  Value: !Sub "https://${Authorization::UserPoolDomain}.auth.${AWS::Region}.amazoncognito.com"

# WebSocket Authorization
- Resource: JwtAuthorizer
  Type: AWS::ApiGatewayV2::Authorizer
  Properties:
    Name: JwtAuthorizer
    ApiId: !Ref Module::WebSocket
    AuthorizerType: REQUEST
    AuthorizerUri: !Sub "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${Authorization::JwtAuthorizerFunction.Arn}/invocations"
    AuthorizerCredentialsArn: !GetAtt Authorization::JwtAuthorizerRole.Arn
    IdentitySource:
      - route.request.querystring.header

- Resource: JwtAuthorizerRole
  Type: AWS::IAM::Role
  Properties:
    AssumeRolePolicyDocument:
      Version: '2012-10-17'
      Statement:
        - Effect: Allow
          Principal:
            Service:
              - apigateway.amazonaws.com
          Action:
            - sts:AssumeRole
    Policies:
      - PolicyName: lambda
        PolicyDocument:
          Version: '2012-10-17'
          Statement:
            - Effect: Allow
              Action: lambda:invokeFunction
              Resource: !GetAtt Authorization::JwtAuthorizerFunction.Arn

- Resource: JwtAuthorizerPermission
  Type: AWS::Lambda::Permission
  Properties:
    Action: lambda:InvokeFunction
    FunctionName: !GetAtt Authorization::JwtAuthorizerFunction.Arn
    Principal: !Sub "apigateway.${AWS::URLSuffix}"
    SourceArn: !Sub "arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${Module::WebSocket}/${Module::WebSocket::StageName}/$connect"

- Function: JwtAuthorizerFunction
  Description: Authorize WebSocket connection using JWT
  Memory: 256
  Timeout: 30
  Environment:
    Issuer: !Ref Authorization::Issuer
    Audience: !Ref Authorization::ClientId