amplify-stack-example.ts

import { AmplifyAuth } from '@aws-amplify/auth-construct-alpha';
import { AmplifyData, AmplifyDataDefinition } from '@aws-amplify/data-construct';
import { NodejsFunction, NodejsFunctionProps } from 'aws-cdk-lib/aws-lambda-nodejs';
import { aws_lambda }from 'aws-cdk-lib';
import * as cdk from 'aws-cdk-lib';
import { UserPool } from 'aws-cdk-lib/aws-cognito';
import { Construct } from 'constructs';
import { DynamoEventSource, DynamoEventSourceProps } from 'aws-cdk-lib/aws-lambda-event-sources';

type LambdaTriggerToDynamoProps = {
  table: cdk.aws_dynamodb.ITable;
  functionProps: NodejsFunctionProps;
  dynamoEventSourceProps: DynamoEventSourceProps;
}

export class AppStack extends cdk.Stack {
  private readonly dataDefaultName = 'amplifyData';

  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);
    const data = new AmplifyData(this, 'amplify-data', {
      definition: AmplifyDataDefinition.fromFiles('../amplify/data/schema.graphql'),
      authorizationModes: {
        userPoolConfig: {
          userPool: UserPool.fromUserPoolId(this, 'ImportedUserPool', '<YOUR_USER_POOL_ID>'),
        },
      },
    });
   this.addLambdaTriggerToDynamo(this, 'order-transaction', {
      table: data.resources.tables.OrderTransaction,
      functionProps: {
        entry: 'app/notifications/order-transaction-notify/handler.ts',
        handler: 'handler'
      },
      dynamoEventSourceProps: {
        startingPosition: aws_lambda.StartingPosition.TRIM_HORIZON,
        batchSize: 10,
        retryAttempts: 1
      }
   });
    // https://docs.amplify.aws/javascript/build-a-backend/graphqlapi/set-up-graphql-api/
    new AmplifyAuth(this, 'amplify-auth', {
      loginWith: {
        email: true,
      },
      multifactor: {
        mode: 'OPTIONAL',
        sms: {
          smsMessage: (code: string) => `Your verification code is ${code}`,
        },
        totp: false,
      },
    });
  }

  private addLambdaTriggerToDynamo(scope: Construct, id: string, props: LambdaTriggerToDynamoProps) {
    const orderTransactionNotifyFn = new NodejsFunction(scope, `${id}-fn`, props.functionProps);
    const dynamoEventSource = new DynamoEventSource(props.table, props.dynamoEventSourceProps);
    orderTransactionNotifyFn.addEventSource(dynamoEventSource);
  }
}