wisdom-coding-test

Context

You're working on an API that accepts analytics data sent by web browsers when shoppers perform actions like viewing a product. This data is referred to as an analytics "beacon". The beacon is sent from the browser using AJAX as a POST request with a JSON body, with some important data (like info about the web browser) automatically included in the headers of the request. You must parse the request, validate it, and save the beacon if the request passes validation.

Acceptance criteria

• The app exposes a POST endpoint at the route /beacon.
• The app parses the request to get the following information for the beacon, with the following validation rules:
  • From headers:
    • User agent string
  • From request body:
    • Product id - required, string, min 1 char, max 100 chars
    • Product name - required, string, min 1 char, max 100 chars
    • Product category - required, string, min 1 char, max 100 chars
    • Product description - not required, string, min 1 char, max 10000 chars
• The app returns a 204 response with no body if validation passes, and a 400 response with no body if validation fails.
• The app records the beacon on disk as minified JSON in a file called beacon.json in the current directory if validation passes.

For example, if the request is sent from Chrome and has a body of:

{
    "productId": "12345",
    "productName": "toilet paper",
    "productCategory": "bathroom things",
    "productDescription": "We probably do not need to tell you how to use this, check Wikipedia."
}

Then the beacon stored on disk in the file beacon.json will be:

{"userAgent":"Chrome 80.0.3987.87","productId": "12345","productName":"toilet paper","productCategory":"bathroom things","productDescription":"We probably do not need to tell you how to use this, check Wikipedia."}

Testing

You can test your program as you code using the command PORT=8080 node index.js and you can send a test request with a curl command such as curl -v -H 'Content-Type: application/json' -d '{"productId": "12345","productName":"toilet paper","productCategory":"bathroom things","productDescription":"We probably do not need to tell you how to use this, check Wikipedia."}' http://localhost:8080/beacon.

If you're on Windows, be sure to use Git Bash to run these commands, because they won't work in PowerShell of the normal Windows command prompt.