list.js

import * as dynamoDbLib from './libs/dynamodb-lib';
import { success, failure } from './libs/response-lib';

export async function main(event, context, callback) {
  const params = {
    TableName: 'notes',
    // 'KeyConditionExpression' defines the condition for the query
    // - 'userId = :userId': only return items with matching 'userId' partition key
    // 'ExpressionAttributeValues' defines the value in the condition
    // - ':userId': defines 'userId' to be User Pool sub of the authenticated user
    KeyConditionExpression: "userId = :userId",
    ExpressionAttributeValues: {
      ":userId": event.requestContext.authorizer.claims.sub,
    }
  };

  try {
    const result = await dynamoDbLib.call('query', params);
    // Return the matching list of items in response body
    callback(null, success(result.Items));
  }
  catch(e) {
    callback(null, failure({status: false}));
  }
};