Resizes images on the fly using Amazon S3, AWS Lambda, and Amazon API Gateway. Using a conventional URL structure and S3 static website hosting with redirection rules, requests for resized images are redirected to a Lambda function via API Gateway which will resize the image, upload it to S3, and redirect the requestor to the resized image. The next request for the resized image will be served from S3 directly.
This is a serverless fork of the awslabs example. Though we take only the lambda function from that, the rest of it's architecture we produce via serverless.yaml.
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Build the Lambda function
The Lambda function uses sharp for image resizing which requires native extensions. In order to run on Lambda, it must be packaged on Amazon Linux. You can accomplish this as follows:
run-gb-service npm install -
Deploy the serverless stack
From the same container in which you built the lambda function, run:
npm install -g serverless export AWS_ACCESS_KEY_ID=<your dev credentials> export AWS_SECRET_ACCESS_KEY=<your dev credentials> serverless deploy --stage <stage | prod>- To view your saved dev credentials, if any, run
cat ~/.aws/credentials
Once complete, at the end of the output check the
endpoints:heading for the url of the API Gateway that performs the dynamic resizing. - To view your saved dev credentials, if any, run
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Test the endpoint
Make a rest call to "?key=/" either via a curl GET, or just pasting it in your browser. For example: "?key=300x300/b/2007/android/hdpi/logo.png"
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(Optional) Restrict resize dimensions
To restrict the dimensions the function will create, set the environment variable
ALLOWED_DIMENSIONSto a string in the format (HEIGHT)x(WIDTH),(HEIGHT)x(WIDTH),....For example: 300x300,90x90,40x40.
This reference architecture sample is licensed under Apache 2.0.