Develop an API server that does simple "Friend Management" based on the User Stories below.

You are required to: Deploy an instance of the API server on the public cloud or provide a 1-step command to run your API server locally, e.g. using a Makefile or Docker Compose) for us to test run the APIs Write sufficient documentation for the APIs and explain your technical choices User Stories 1. As a user, I need an API to create a friend connection between two email addresses. The API should receive the following JSON request: { friends: [ 'andy@[login to view URL]', 'john@[login to view URL]' ] } The API should return the following JSON response on success: { "success": true } Please propose JSON responses for any errors that might occur. 2. As a user, I need an API to retrieve the friends list for an email address. The API should receive the following JSON request: { email: 'andy@[login to view URL]' } The API should return the following JSON response on success: { "success": true, "friends" : [ 'john@[login to view URL]' ], "count" : 1 } Please propose JSON responses for any errors that might occur. 3. As a user, I need an API to retrieve the common friends list between two email addresses. The API should receive the following JSON request: { friends: [ 'andy@[login to view URL]', 'john@[login to view URL]' ] } The API should return the following JSON response on success: { "success": true, "friends" : [ 'common@[login to view URL]' ], "count" : 1 } Please propose JSON responses for any errors that might occur. 4. As a user, I need an API to subscribe to updates from an email address. Please note that "subscribing to updates" is NOT equivalent to "adding a friend connection". The API should receive the following JSON request: { "requestor": "lisa@[login to view URL]", "target": "john@[login to view URL]" } The API should return the following JSON response on success: { "success": true } Please propose JSON responses for any errors that might occur. 5. As a user, I need an API to block updates from an email address. Suppose "andy@[login to view URL]" blocks "john@[login to view URL]": if they are connected as friends, then "andy" will no longer receive notifications from "john" if they are not connected as friends, then no new friends connection can be added The API should receive the following JSON request: { "requestor": "andy@[login to view URL]", "target": "john@[login to view URL]" } The API should return the following JSON response on success: { "success": true } Please propose JSON responses for any errors that might occur. 6. As a user, I need an API to retrieve all email addresses that can receive updates from an email address. Eligibility for receiving updates from i.e. "john@[login to view URL]": has not blocked updates from "john@[login to view URL]", and at least one of the following: has a friend connection with "john@[login to view URL]" has subscribed to updates from "john@[login to view URL]" has been @mentioned in the update The API should receive the following JSON request: { "sender": "john@[login to view URL]", "text": "Hello World! kate@[login to view URL]" } The API should return the following JSON response on success: { "success": true "recipients": [ "lisa@[login to view URL]", "kate@[login to view URL]" ] } Please propose JSON responses for any errors that might occur. Technology You are required to use Java. You are allowed to use any frameworks for the language. Testing If you write tests in your daily work, we would love to see them in this exercise too.