aws-cloudfront-sign

---

NOTE
The AWS SDK for JavaScript has added support for generating signed URLs and Cookies. Please see Class: AWS.CloudFront.Signer

---

Generating signed URLs for CloudFront links is a little more tricky than for S3. It's because signature generation for S3 URLs is handled a bit differently than CloudFront URLs and this functionality is not currently supported by the aws-sdk library for JavaScript. In case you also need to do this, I've created this simple utility to make things easier.

Usage

Requirements

• Node.js >=18
• Active CloudFront distribution with origin configured

Configuring CloudFront

1. Create a CloudFront distribution
2. Configure your origin with the following settings:

**Origin Domain Name:** {your-s3-bucket}
**Restrict Bucket Access:** Yes
**Grant Read Permissions on Bucket:** Yes, Update Bucket Policy

1. Create CloudFront Key Pair. more infocfkeypairdocs

Installing

npm install aws-cloudfront-sign

TypeScript

import { SignatureOptions } from 'aws-cloudfront-sign/types'

Upgrading from 2.x to 3.x

• There shouldn't be any breaking changes when coming to 3.x. RTMP URLs were deprecated by Amazon

but that will affect all versions.

• Support for ES Modules was added
• Support for TypeScript was added

Upgrading from 1.x to 2.x

• expireTime now takes it's value as milliseconds, Date, or

momentmomentdocs instead of seconds.

API

getSignedUrl(url, options)

• @param {String} url - Cloudfront URL to sign
• @param {Object} options - URL signature options
• @return {String} signedUrl - Signed CloudFrontUrl

getSignedCookies(url, options)

• @param {String} url - Cloudfront URL to sign
• @param {Object} options - URL signature options
• @return {Object} cookies - Signed AWS cookies

getSignedRTMPUrl(domainName, s3key, options)

⛔️ Deprecated: RTMP Support Discontinuing on December 31, 2020

• @param {String} domainName - Domain name of your Cloudfront distribution
• @param {String} s3key - Path to s3 object
• @param {Object} options - URL signature options
• @return {Object} url.rtmpServerPath - RTMP formatted server path
• @return {Object} url.rtmpStreamName - Signed RTMP formatted stream name

Options

• expireTime (Optional - Default: 1800 sec == 30 min) - The time when the URL should expire. Accepted values are

* number - Time in milliseconds (`new Date().getTime() + 1800000`)
* moment - Valid [momentjs][moment_docs] object (`moment().add(1, 'day')`)
* Date - Javascript Date object (`new Date(2016, 0, 1)`)

• ipRange (Optional) - IP address range allowed to make GET requests

for your signed URL. This value must be given in standard IPv4 CIDR format (for example, 10.52.176.0/24).

• keypairId - The access key ID from your Cloudfront keypair
• privateKeyString || privateKeyPath - The private key from your Cloudfront

keypair. It can be provided as either a string or a path to the .pem file.

Note: When providing the private key as a string, ensure that the newline character is also included.
```js const privateKeyString =

'-----BEGIN RSA PRIVATE KEY-----\n'
'MIIJKAIBAAKCAgEAwGPMqEvxPYQIffDimM9t3A7Z4aBFAUvLiITzmHRc4UPwryJp\n'
'EVi3C0sQQKBHlq2IOwrmqNiAk31/uh4FnrRR1mtQm4x4IID58cFAhKkKI/09+j1h\n'
'tuf/gLRcOgAXH9o3J5zWjs/y8eWTKtdWv6hWRxuuVwugciNckxwZVV0KewO02wJz\n'
'jBfDw9B5ghxKP95t7/B2AgRUMj+r47zErFwo3OKW0egDUpV+eoNSBylXPXXYKvsL\n'
'AlznRi9xNafFGy9tmh70pwlGG5mVHswD/96eUSuLOZ2srcNvd1UVmjtHL7P9/z4B\n'
'KdODlpb5Vx+54+Fa19vpgXEtHgfAgGW9DjlZMtl4wYTqyGAoa+SLuehjAQsxT8M1\n'
'BXqfMJwE7D9XHjxkqCvd93UGgP+Yxe6H+HczJeA05dFLzC87qdM45R5c74k=\n'
'-----END RSA PRIVATE KEY-----'

``` Also, here are some examples if prefer to store your private key as a string but within an environment variable. ```sh # Local env example CFPRIVATEKEY="$(cat your-private-key.pem)"
# Heroku env heroku config:set CFPRIVATEKEY="$(cat your-private-key.pem)" ```

Examples

Creating a signed URL

By default the URL will expire after half an hour.

// ESM: import { getSignedUrl } from 'aws-cloudfront-sign'
const cf = require('aws-cloudfront-sign')
const options = {keypairId: 'APKAJM2FEVTI7BNPCY4A', privateKeyPath: '/foo/bar'}
const signedUrl = cf.getSignedUrl('http://xxxxxxx.cloudfront.net/path/to/s3/object', options);
console.log('Signed URL: ' + signedUrl);

Creating signed cookies

// ESM: import { getSignedCookies } from 'aws-cloudfront-sign'
const cf = require('aws-cloudfront-sign')
const options = {keypairId: 'APKAJM2FEVTI7BNPCY4A', privateKeyPath: '/foo/bar'}
const signedCookies = cf.getSignedCookies('http://xxxxxxx.cloudfront.net/*', options);

// You can now set cookies in your response header. For example:
for(var cookieId in signedCookies) {
 res.cookie(cookieId, signedCookies[cookieId]);
}