add middleware to convert all requests with yaml content type to json

[Adamkadaban]

Checklist

• I have added a version label to my PR (e.g., patch, minor, major).
• I have tested my changes locally and verified they work as expected.
• I have added relevant tests to cover my changes.
• I have made any necessary updates to the documentation.

Description

This PR will allow users to supply yaml, which will be converted to JSON

This adds a FastAPI middleware to convert all requests with a content-type of yaml to one with a json body, content-type, etc.

Content type of application/yaml is used as per RFC 9512.

I ended up going for content-type instead of the get param ?yaml=true, as curl, fastapi test client, requests library, etc. all implicitly will set the content-type to json when a user provides json. I think this is better, since ?yaml=false won't have to be provided to requests.

Partially Fixes: #24
Note: There is currently no support for subnet-level tagging

[Adamkadaban]

@alexchristy it seems that I can set up manual scoping bc request in the middleware has a url attribute.

So I can make a set of routes that are allowed here and put it in some config file somewhere.

Where do you think that config should go? I also think we may want to put the middleware in a separate file than main.py

[alexchristy]

@alexchristy it seems that I can set up manual scoping bc request in the middleware has a url attribute.

So I can make a set of routes that are allowed here and put it in some config file somewhere.

Where do you think that config should go? I also think we may want to put the middleware in a separate file than main.py

I was thinking in a folder src/app/middleware and we could call it something along the lines of yaml_to_json_middleware.py. Source: https://github.com/igorbenav/FastAPI-boilerplate/tree/main/src/app/middleware

[Adamkadaban]

looks like I don't even have to do anything weird with the url field. I can just make the middleware only for the templates router
https://gist.github.com/geospatial-jeff/17d677202f1223eacd3b32960ac29c60

[Adamkadaban]

Closing this in favor of new branch to make PR easier