once: a one-time file sharing personal service

It happens that I want to share a file with someone which is sensitive enough that I don't want to upload on a public free service.

I would like to have something like transfer.sh, running as a personal service, with the following features:

• it must be serverless (I'm not willing to pay except for the actual file storage, and only for the time strictly required)
• it must return a link that I can share to anyone
• file must be deleted as soon as it get successfully downloaded
• it must expose a simple HTTP API, so curl should suffice to share a file
• it must be protected with some form of authentication

With CDK I could create the following resources:

• An S3 bucket to host the uploaded files
• A Lambda function to implement the 'get-upload-ticket'
• A Dynamodb table to store the information about the entries
• Another Lambda function to implement a "smart" download handler, to delete the file after the very first successful transfer.

I will use API Gateway to expose the lambda functions as an HTTP API.

HERE BE DIAGRAM!

TODO

[+] Publish it to a custom domain name: DONE [+] Set logs retention policy [+] Deploy custom domain as a nested stack [+] Mask link preview depending on the user agent

• Add a robust authentication method

• Add progressbar to client

• Package application as a click app

• Write a proper README with instructions

• Record a demo

• write tests with pytest

• publish the source code

• write a blog post

• add a link to the blog post in the README