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@JeremyPlease
Last active July 20, 2022 19:45
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// load the AWS SDK
const AWS = require('aws-sdk')
// load CloudFront key pair from environment variables
// Important: when storing your CloudFront private key as an environment variable string,
// you'll need to replace all line breaks with \n, like this:
// CF_PRIVATE_KEY="-----BEGIN RSA PRIVATE KEY-----\nMIIE...1Ar\nwLW...2eL\nFOu...k2E\n-----END RSA PRIVATE KEY-----"
const cloudfrontAccessKeyId = process.env.CF_ACCESS_KEY_ID
const cloudFrontPrivateKey = process.env.CF_PRIVATE_KEY
const signer = new AWS.CloudFront.Signer(cloudfrontAccessKeyId, cloudFrontPrivateKey)
// 2 days as milliseconds to use for link expiration
const twoDays = 2*24*60*60*1000
// sign a CloudFront URL that expires 2 days from now
const signedUrl = signer.getSignedUrl({
url: 'https://248hf0w8hs.cloudfront.net/secret-image.jpg',
expires: Math.floor((Date.now() + twoDays)/1000), // Unix UTC timestamp for now + 2 days
})
// signedUrl is now a signed CloudFront URL:
// https://248hf0w8hs.cloudfront.net/secret-image.jpg?Expires=1531165045&Key-Pair-Id=HDIWEUY39S87XHCJDJUQODJ20AL&Signature=0SGI2...K2JHID__
@oelbaga
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oelbaga commented Nov 21, 2021

@pnutmath The aws-sdk-js-v3 is a total rewrite. I'm still using the still maintained v2 sdk in all production projects.

Confirming I've tested and am using @JeremyPlease implementation with the v3 aws-sdk successfully.

@JeremyPlease
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@oelbaganwg Glad to hear this was helpful! And good to know about configuring CloudFront IAM policy correctly.

• start to use a domain name instead of the CloudFront domain.

I've never tested with a non-cloudfront domain, but hypothetically it shouldn't affect anything.

• implement MFA on your CloudFront account

Also never tested this, but I think MFA should be a separate layer before the signed URL and not affect things.

Confirming I've tested and am using @JeremyPlease implementation with the v3 aws-sdk successfully.

Niiice!

@0xmovses
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0xmovses commented Jan 6, 2022

this saved us thank you!. we're are on aws-sdk v3 and no issues to report, the code is returning a signedUrl successfully. I might add, I also had to wrap in double quotes, in single quotes the function returns an error. Very fussy indeed.

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