Cloud Rendition Service

This is an implementation of the blog post found here: https://aws.amazon.com/blogs/networking-and-content-delivery/resizing-images-with-amazon-cloudfront-lambdaedge-aws-cdn-blog/

How To Build The Lambdas?

This command will build the Docker image used to compile nodes and the install and package the Lambda functions in the dist directory

# make docker
# make

How To Deploy?

We first have to create an S3 bucket that will holds the deployment file that were built in the previous step.

# aws s3 mb s3://my-deployment-bucket

Then we use the deploy target:

# DEPLOYMENT_BUCKET=my-deployment-bucket make deploy

Other parameters for the deploy target are:

STACK_NAME: Name of the CloudFormation stack that will be deployed
IMAGE_BUCKET: Prefix of the S3 bucket where image will uploaded

The deploy target issues a describe stack command at the end:

{
    "Stacks": [
        {
            "StackId": "arn:aws:cloudformation:us-east-1:XXXXXXXXXXXXX:stack/image-resize/aaaaaaaaaaaaaa",
            "DriftInformation": {
                "StackDriftStatus": "NOT_CHECKED"
            },
            "LastUpdatedTime": "2019-10-10T21:41:44.411Z",
            "Tags": [],
            "Outputs": [
                {
                    "ExportName": "image-resize-ImageBucket",
                    "OutputKey": "ImageBucket",
                    "OutputValue": "image-resize-XXXXXXXXXXXXX-us-east-1"
                },
                {
                    "ExportName": "image-resize-",
                    "OutputKey": "CloudFrontDomain",
                    "OutputValue": "xxxxxxxx.cloudfront.net"
                },
                {
                    "ExportName": "image-resize-MyDistribution",
                    "OutputKey": "Distribution",
                    "OutputValue": "XXXXXXXXXXXXX"
                }
            ],
            "EnableTerminationProtection": false,
            "CreationTime": "2019-10-10T20:45:44.728Z",
            "Capabilities": [
                "CAPABILITY_IAM"
            ],
            "StackName": "image-resize",
            "NotificationARNs": [],
            "StackStatus": "UPDATE_COMPLETE",
            "DisableRollback": false,
            "ChangeSetId": "arn:aws:cloudformation:us-east-1:XXXXXXXXXXXXX:changeSet/awscli-cloudformation-package-deploy-xxxxxx",
            "RollbackConfiguration": {}
        }
    ]
}

The important data are in the outputs part.

How To Use?

We first have to upload some pictures in the S3 image bucket (see ImageBucket output of our stack) using whatever tool (S3 sync, S3 copy...).

# aws s3 cp mypicture.png s3://image-resize-XXXXXXXXXXXXX-us-east-1/images/mypicture.png

Then we can access that picture with the CloudFront domain that has been create (see CloudFrontDomain of our stack).

# wget https://xxxxxx.cloudfront.net/images/mypicture.png

If we want a resized versions:

# wget https://xxxxxx.cloudfront.net/images/mypicture.png?d=100x100

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