feat: add endpoint for getting data about a given document

[kaiiorg]

Related to #75

Adds endpoint at /api/cdn/doc/:filename that attempts to get relevant information for the requested document.

Example:
GET http://localhost:8080/api/cdn/doc/resume.pdf
returns

{
  "download_url": "localhost:8080/api/cdn/download/docs/resume.pdf",
  "file_size": 68403,
  "filename": "resume.pdf"
}

Confirmed the download_url works by pasting it in a web browser

I have not yet written any documentation for this endpoint yet. Wanted to get initial feedback first.

[kevinanielsen]

Looks great so far! Documentation would be great!
If you could add tests for it, that would be amazing, but not necessary at all.

I'm going to assign you to the Issue

[kaiiorg]

I've added the spec; I'll write some tests later today. Doesn't look like the project has any existing tests, am I correct?

[kaiiorg]

Wrote tests covering every case except for when os.Stat fails for some reason other than the file not existing. Not sure how I'd force that to happen on demand.

[kaiiorg]

I think this is ready for review, aside from maybe adding another make target and a github actions job to run the tests. I can do that if you'd like.

[kevinanielsen]

That would be amazing - I am struggling a bit with testing, as I am new to Go. Any contributions would be great! I will review you work for this issue now :)

[kevinanielsen]

Looks great!

[kaiiorg]

No problem on the testing; I'll open another issue for setting up the make target and github actions job and I'll work on that.