aws-s3-node-lambda-image-scaler

AWS lambda function to serve scaled images from S3 buckets.

Installation

Clone the repo

git clone https://github.com/martinhjartmyr/aws-s3-node-lambda-image-scaler.git && cd aws-s3-node-lambda-image-scaler

Install deps

pnpm install

Download sharp layer

pnpm run download-sharp-layer

Deploy sharp layer

pnpm run deploy-sharp-layer

Build the lambda

pnpm build

Create a role for the lambda function:

aws iam create-role --role-name s3-image-scaler --assume-role-policy-document file://trust-policy.json && aws iam attach-role-policy --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole --role-name s3-image-scaler && aws iam attach-role-policy --policy-arn arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess --role-name s3-image-scaler

Copy the Arn from the output and use it in the next step.

arn:aws:iam::123456789:role/s3-image-scaler

Create the lambda function:

aws lambda create-function --function-name s3-image-scaler --runtime "nodejs18.x" --timeout 10 --memory-size 256 --zip-file "fileb://dist/index.zip" --handler index.handler --role [!!! CHANGE ME ROLE FROM ABOVE OUTPUT !!!]

Set the required environment variables, ALLOWED_BUCKETS needs to be comma separated.

aws lambda update-function-configuration --function-name s3-image-scaler --environment "Variables={ALLOWED_BUCKETS=[!!! CHANGE ME!!!],REGION=[!!! CHANGE ME!!!],DEBUG=false}"

Create a function URL. The output will display the generated URL that will be publicly accessible.

aws lambda create-function-url-config --function-name s3-image-scaler --auth-type NONE

Grant access to call the lambda function from the url

aws lambda add-permission --function-name s3-image-scaler --statement-id AuthNone --action lambda:InvokeFunctionUrl --principal "*" --function-url-auth-type NONE

It's recommended that you set up a CloudFront distribution in front of the function url.

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

License

MIT