An Azure function implementing a URL shortening service backed by Azure blob storage in the fewest lines of code possible (~70 LoC).

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1. Fork the repo
2. Create an Azure Functions app for it
3. Add an X-Authorization setting containing a shared key used for creating the short links
4. Add automated deployment from the repo

The short URLs will be persisted in the same Azure storage account used by the app, in a table named Aka.

The function provides a REST API for URL shortening, as well as the resolving itself. All mutating operations (POST, PUT, DELETE) require the client providing an X-Authorization value that needs to match the setting configured server-side (that is, a shared key/secret).

Usage is trivial: just POST or PUT to the desired short URL you want, passing the target URL in the body, like so:

# create or update shortlink
curl -d [TARGET_URL] -H "X-Authorization: [SHARED_SECRET]" https://[FUNCTION_APP_URL]/[SHORT_ALIAS]

The X-Authorization must match what you specified in step 3 during install/configuration.

That's it.

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