twilio-status-check.yaml

---
AWSTemplateFormatVersion: 2010-09-09
Description: "Twilio SMS StatusCallback"
Parameters:
  SlackWebhook:
    Type: String
    Description: "Slack incoming webhook url."
  PhoneListTableName:
    Type: String
    Description: "Store phone numbers which send failed."
Resources:
  PhoneListTable:
    Type: "AWS::DynamoDB::Table"
    Properties:
      AttributeDefinitions:
        -
          AttributeName: "userPhoneNumber"
          AttributeType: "S"
      KeySchema:
        -
          AttributeName: "userPhoneNumber"
          KeyType: "HASH"
      BillingMode: "PAY_PER_REQUEST"
      TableName: !Ref PhoneListTableName
  CallbackServiceRole:
    Type: "AWS::IAM::Role"
    Properties:
      Path: /
      RoleName: "callback_lambda_role"
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - "lambda.amazonaws.com"
            Action:
              - "sts:AssumeRole"
      ManagedPolicyArns:
        - "arn:aws:iam::aws:policy/AmazonDynamoDBFullAccess"
        - "arn:aws:iam::aws:policy/CloudWatchLogsFullAccess"
  CallbackFunction:
    Type: "AWS::Lambda::Function"
    Properties:
      FunctionName: "twilio_statuscallback_backend"
      Description: "Twilio statuscallback backend"
      Role: !GetAtt "CallbackServiceRole.Arn"
      Runtime: nodejs10.x
      MemorySize: 128
      Timeout: 10
      Handler: index.handler
      Environment:
        Variables:
          WEBHOOK_URL: !Ref SlackWebhook
          TABLE_NAME: !Ref PhoneListTableName
      Code:
        S3Bucket: "sample-lambda-code-for-blog"
        S3Key: "twilio-statuscallback.zip"
  CallbackPermission:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !GetAtt CallbackFunction.Arn
      Action: lambda:InvokeFunction
      Principal: apigateway.amazonaws.com
    DependsOn: CallbackFunction
  RestApi:
    Type: AWS::ApiGateway::RestApi
    Properties:
      Name: "twilio-statuscallback"
  ApiResource:
    Type: "AWS::ApiGateway::Resource"
    Properties:
      RestApiId:
        Ref: "RestApi"
      ParentId:
        !GetAtt
          - "RestApi"
          - "RootResourceId"
      PathPart: "callback"
  CallbackMethod:
    DependsOn: "CallbackPermission"
    Type: AWS::ApiGateway::Method
    Properties:
      RestApiId:
        Ref: "RestApi"
      ResourceId:
        Ref: "ApiResource"
      HttpMethod: "POST"
      AuthorizationType: "None"
      Integration:
        Type: "AWS_PROXY"
        IntegrationHttpMethod: "POST"
        Uri: 
          !Join
            - ""
            - - !Sub "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/"
              - !GetAtt CallbackFunction.Arn
              - "/invocations"
      MethodResponses:
        -
          ResponseModels:
            application/json: Empty
          StatusCode: 200
  CallbackDeployment:
    DependsOn: "CallbackMethod"
    Type: AWS::ApiGateway::Deployment
    Properties:
      RestApiId:
        Ref: "RestApi"
  CallbackStage:
    Type: AWS::ApiGateway::Stage
    Properties:
      StageName: prd
      RestApiId:
        Ref: "RestApi"
      DeploymentId:
        Ref: "CallbackDeployment"