Retrieves a list of up to 100 contacts via emails exchanged (i.e. when there's a reply to a sent email)
$ npm i
$ node .
Navigate to localhost:3000/login and login with your Google account.
$ npm test
Only added unit tests for parsing business logic. In production, we could add integration tests if we want to ensure behavior involving API/DBMS calls.
/login
Generates an authentication URL with Google OAuth2 API with requested scopes and redirects user to OAuth consent screen.
/oauth2/redirect
Callback from Google OAuth. Sets credentials (access + refresh token) for OAuth2 client and redirects user to /list endpoint
/list
Uses Google Gmail API to parse an authenticated user's inbox, retrieving message headers and filtering for sender emails.
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I use the maximum records allowed by Google's API (500) to retrieve sent emails - since we are concerned with exchanges, it's possible that under 100 contacts are ultimately returned. (e.g. if the last 500 emails someone has sent has no replies). A way to solve this is by batching API calls until we have 100 contacts, but I did not implement this edge case in the interest of time.
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Dynamic authorization scopes in environment
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Authentication middleware to protect endpoints instead of checking the client credentials
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Persistance layer (not necessary in context of this application)
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Integration tests