lambda-optimize-image 📷

Lambda function to optimize images uploaded to S3. Images uploaded to a source S3 bucket are optimized with sharp and uploaded to a destination bucket.

Getting started

You will need an AWS account and the AWS CLI installed.

AWS setup

Create an AWS role with Permission Policy AWSLambdaExecute (this allows S3 GET and PUT and CloudWatch logging)
Create two S3 buckets:
- bucket-name (for source images)
- bucket-name-public (for optimized images - in my setup, it is set up for public access)

Deploy the Lambda function

Clone this repo
Run npm install
Run AWS_ROLE=arn:aws:iam::[account-id]:role/[role-name] npm run deploy (this zips the function and deploys it to Lambda)

Configure AWS events

Allow the S3 source bucket to call the Lambda by running:

aws lambda add-permission --function-name optimizeImage --principal s3.amazonaws.com \
--statement-id s3invoke --action "lambda:InvokeFunction" \
--source-arn arn:aws:s3:::[bucket-name] \
--source-account [account-id]

Check the newly created policy with aws lambda get-policy --function-name optimizeImage
In the source bucket (bucket-name), go to Properties ➡️ Events ➡️ Add notification. Create a notification that sends All object create events to your Lambda function.

Credits