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 Identity Pool identity id
    //   of the authenticated user
    KeyConditionExpression: 'userId = :userId',
    ExpressionAttributeValues: {
      ':userId': event.requestContext.identity.cognitoIdentityId
    }
  }

  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 }))
  }
}