cdk-url-shortener

Deploy a URL shortener with custom domain support in just a few lines of code.

cdk-url-shortener is an AWS CDK L3 construct that will create a URL shortener with custom domain support. The service uses nanoid to generate URL-friendly unique IDs and will retry if an ID collision occurs.

Additionally, you can enable DynamoDB streams to capture changes to items stored in the DynamoDB table.

Table of Contents

• Features
• Installation
• Usage
  • Basic
  • Custom Domain
  • Multiple Custom Domains
  • Enable DynamoDB Streams
• Create your first short URL
• Documentation
  • Construct API Reference
  • URL Shortener API Endpoints
    • Shorten a Link
    • Visit a shortened URL
• Supporting this project
• License

Features

• 🚀 Easy to Start - One-liner code to have your own URL shortener.
• 🏢 Custom Domain - Bring your custom domain name that fits your brand.
• 📡 DynamoDB Streams - Capture table activity with DynamoDB Streams.

Installation

TypeScript/JavaScript

$ npm install @rayou/cdk-url-shortener

Python

$ pip install rayou.cdk-url-shortener

.Net

$ nuget install CDK.URLShortener

# See more: https://www.nuget.org/packages/CDK.URLShortener/

Usage

Basic

import { URLShortener } from '@rayou/cdk-url-shortener';

new URLShortener(this, 'myURLShortener');

Custom Domain

import * as route53 from '@aws-cdk/aws-route53';
import * as acm from '@aws-cdk/aws-certificatemanager';
import { URLShortener } from '@rayou/cdk-url-shortener';

const zone = route53.HostedZone.fromLookup(this, 'HostedZone', {
  domainName: 'mydomain.com',
});

// Optional, a DNS validated certificate will be created if not provided.
const certificate = acm.Certificate.fromCertificateArn(
  this,
  'Certificate',
  'arn:aws:acm:region:123456789012:certificate/12345678-1234-1234-1234-123456789012',
);

new URLShortener(this, 'myURLShortener').addDomainName({
  domainName: 'foo.mydomain.com',
  zone,
  certificate,
});

Multiple Custom Domains

import * as route53 from '@aws-cdk/aws-route53';
import { URLShortener } from '@rayou/cdk-url-shortener';

const zone = route53.HostedZone.fromLookup(this, 'HostedZone', {
  domainName: 'mydomain.com',
});

new URLShortener(this, 'myURLShortener')
  .addDomainName({
    domainName: 'foo.mydomain.com',
    zone,
  })
  .addDomainName({
    domainName: 'bar.mydomain.com',
    zone,
  });

⚠️ Please note that although we have added two custom domains, they are pointed to the same URL shortener instance sharing the same DynamoDB table, if you need both domains run independently, create a new URL shortener instance.

Enable DynamoDB Streams

import * as lambda from '@aws-cdk/aws-lambda';
import * as dynamodb from '@aws-cdk/aws-dynamodb';
import * as lambdaEventSources from '@aws-cdk/aws-lambda-event-sources';

import { URLShortener } from '@rayou/cdk-url-shortener';

const table = new dynamodb.Table(this, 'Table', {
  partitionKey: {
    name: 'id',
    type: dynamodb.AttributeType.STRING,
  },
  stream: dynamodb.StreamViewType.NEW_AND_OLD_IMAGES,
});

new URLShortener(this, 'myURLShortener', {
  dynamoTable: table,
});

const streamHandlerCode = `'use strict';
    exports.handler = async (event) => {
      console.log('Received event:', JSON.stringify(event, null, 2));
      for (const record of event.Records) {
        console.log(record.eventID);
        console.log(record.eventName);
        console.log('DynamoDB Record: %j', record.dynamodb);
      }
      console.log(\`Successfully processed \${event.Records.length} records.\`);
    };`;

const lambdaFn = new lambda.Function(this, 'myStreamHandler', {
  runtime: lambda.Runtime.NODEJS_12_X,
  handler: 'index.handler',
  code: lambda.Code.fromInline(streamHandlerCode),
});

lambdaFn.addEventSource(
  new lambdaEventSources.DynamoEventSource(table, {
    startingPosition: lambda.StartingPosition.LATEST,
  }),
);

Create your first short URL

1. After the deployment, you'll see ApiKeyURL and ApiEndpoint in CDK Outputs, visit ApiKeyURL to get your API key.

   Outputs:
   stack.CustomDomainApiEndpointcc4157 = https://mydomain.com
   stack.myURLShortenerApiEndpoint47185311 = https://yrzxcvbafk.execute-api.us-west-2.amazonaws.com/prod/
   stack.ApiKeyURL = https://console.aws.amazon.com/apigateway/home?#/api-keys/k2zxcvbafw6

2. Run this cURL command to create your first short URL, an ID will be returned in the response.

   $ curl https://{API_ENDPOINT} /
       -X POST \
       -H 'content-type: application/json' \
       -H 'x-api-key: {API_KEY}' \
       -d '{
         "url": "https://github.com/rayou/cdk-url-shortener"
       }'
   
   {"id":"LDkPh"}

3. Visit https://{API_ENDPOINT}/{ID} then you'll be redirected to the destination URL.

   $ curl -v https://{API_ENDPOINT}/{ID} # e.g. https://mydomain.com/LDkPh
   
   < HTTP/2 301
   < content-type: text/html; charset=UTF-8
   < content-length: 309
   < location: https://github.com/rayou/cdk-url-shortener
   
   <!DOCTYPE html><html><head><meta charset="UTF-8" /><meta http-equiv="refresh" content="0;url=https://github.com/rayou/cdk-url-shortener" /><title>Redirecting to https://github.com/rayou/cdk-url-shortener</title></head><body>Redirecting to <a href="https://github.com/rayou/cdk-url-shortener">https://github.com/rayou/cdk-url-shortener</a>.</body></html>

Documentation

Construct API Reference

See API.md.

URL Shortener API Endpoints

Shorten a Link

HTTP REQUEST

POST /

HEADERS

Name	Value	Required
content-type	application/json	Required
x-api-key	Get your api key here	Required

ARGUMENTS

Parameter	Type	Required	Description
url	string	Required	Destination URL

Example Request

curl https://mydomain.com /
  -X POST \
  -H 'content-type: application/json' \
  -H 'x-api-key: v3rYsEcuRekey' \
  -d '{
    "url": "https://github.com/rayou/cdk-url-shortener"
  }'

Response (201)

{
  "id": "LDkPh"
}

Visit a shortened URL

HTTP REQUEST

GET /:id

Example Request

curl https://mydomain.com/:id

Response (301)

< HTTP/2 301
< content-type: text/html; charset=UTF-8
< content-length: 309
< location: https://github.com/rayou/cdk-url-shortener

<!DOCTYPE html><html><head><meta charset="UTF-8" /><meta http-equiv="refresh" content="0;url=https://github.com/rayou/cdk-url-shortener" /><title>Redirecting to https://github.com/rayou/cdk-url-shortener</title></head><body>Redirecting to <a href="https://github.com/rayou/cdk-url-shortener">https://github.com/rayou/cdk-url-shortener</a>.</body></html>

Supporting this project

I'm working on this project in my free time, if you like my project, or found it helpful and would like to support me, you can buy me a coffee, any contributions are much appreciated! ❤️

License

This project is distributed under the Apache License, Version 2.0.