webfinger lambda

small aws lambda that filters a static JSON file of webfinger data from an s3 bucket and returns the one matching the query parameter subject.

building

use the cargo-lambda tool to build the zip file to upload to aws

$ cargo lambda build --release --output-format zip

because it's a lambda there is currently no way to run this locally. this should eventually be rectified.

you can then point a custom domain to the lambda.