IndyVC / interview-wifi-credentials

An interview exercise for candidates

Visitor WiFi Credentials generator exercise

Part 1

This is a WiFi credentials generator micro-service that responds to Visitor check-in events with credentials (username/password)

The function to generate the credentials is provided and is located in proxyclick/credentials.ts The visitors should be searched through via the Proxyclick API: https://api.proxyclick.com/v1/docs/#introduction

• The company ID to be used is the following: CO-CXER585
• Client ID: 98C5EB84170E6FB3617C47A5B17ECFACB4A0FD49
• Client secret will be sent via email

Goal

• Make sure that all the tests cases located in visitors.test.ts and process.test.ts pass. Do not modify the test files
• Start by writing the body of the function getVisitors that search through visitors using Proxyclick API
• Then, write code in the function handleCheckin located in process/process.ts
• Feel free to create more files with your structured code if you feel it is necessary
• For the last test case, we would like to optimize the process so that consecutive checks-in of the same visitor do not need to call generate multiple times. The first result should be saved in-memory
• Create a zip file with your solution (the project) and send it back to your interviewer

Flow

1. Check-in event coming in. Find visitor corresponding to email from Proxyclick API
2. If visitor not found -> throw an error
3. If visitor is found but firstname/lastname mismatch -> Update visitor using the function updateVisitor
4. Generate credentials for this visitor and returns it

Part 2

Please write the function in sender.ts that will call the EmailSender.sendEmail() function. If sendEmail() throws an error, it should retry 4 times with 10min interval, then stop retrying while logging an error message. Please write the unit tests for this function

Part 3

Please write an API that will serve your previously defined functions

• GET /visitors: this endpoint should allow to search visitors and return an array of visitors by calling the getVisitors
• POST /check-in: This endpoint receives a VisitorEvent in the POST body and should call the handleCheckin. It should returns a 204 if everything went well.

• Write your code in the /api folder
• Feel free to use any framework for writing your API
• Make sure to handle error cases and return appropriate responses
• Please write unit tests for the API endpoints

Part 4

Please do the architecture exercice located in Webhooks.md

Commands

• npm install install the necessary dependencies
• npm run build build the javascript
• npm start run the process
• npm run watch continuously build and run the process
• npm test continously run the test cases

If you have any questions, feel free to contact us