This is a JetBrains Academy Project. Where I develop a multi-user web service for creating and solving quizzes using REST API, an embedded database, security, and other technologies. This is a server side ("engine") without a user interface at all.

To register a new user, the client needs to send a JSON with email and password via POST request to /api/register:

{
  "email": "[email protected]",
  "password": "secret"
}

*The service returns 200 (OK) status code if the registration has been completed successfully.

*If the email is already taken by another user, the service will return the 400 (Bad request) status code.

*User need to pass Basic Authorization header containing email and password to access any service.

To create a new quiz, the client needs to send a JSON as the request's body via POST to /api/quizzes.

The JSON should contain the four fields:

• title a string, required;
• text a string, required;
• options an array of strings, required, should contain at least 2 items;
• answer integer index of the correct option, optional, since all options can be wrong.

Here is a new JSON quiz as an example:

{
  "title": "The Java Logo",
  "text": "What is depicted on the Java logo?",
  "options": ["Robot","Tea leaf","Cup of coffee","Bug"],
  "answer": 2
}

*The answer equals [0,2] corresponds to the first and the third item from the options array ("Americano" and "Cappuccino"). The server response is a JSON with four fields: id, title, text and options. Here is an example:

{
  "id": 1,
  "title": "The Java Logo",
  "text": "What is depicted on the Java logo?",
  "options": ["Robot","Tea leaf","Cup of coffee","Bug"]
}

*If the request JSON does not contain title or text, or they are empty strings (""), then the server should respond with the 400 (Bad request) status code. If the number of options in the quiz is less than 2, the server returns the same status code.

To get a quiz by id, the client sends the GET request to /api/quizzes/{id}. Here is a response example:

{
  "id": 1,
  "title": "The Java Logo",
  "text": "What is depicted on the Java logo?",
  "options": ["Robot","Tea leaf","Cup of coffee","Bug"]
}

*If the specified quiz does not exist, the server should return the 404 (Not found) status code.

To get all existing quizzes in the service, the client sends the GET request to /api/quizzes. The response contains a JSON array of quizzes like the following:

[
  {
    "id": 1,
    "title": "The Java Logo",
    "text": "What is depicted on the Java logo?",
    "options": ["Robot","Tea leaf","Cup of coffee","Bug"]
  },
  {
    "id": 2,
    "title": "The Ultimate Question",
    "text": "What is the answer to the Ultimate Question of Life, the Universe and Everything?",
    "options": ["Everything goes right","42","2+2=4","11011100"]
  }
]

*If there are no quizzes, the service returns an empty JSON array: [].

*In both cases, the status code is 200 (OK).

*The API should support the navigation through pages by passing the page parameter ( /api/quizzes?page=1).

To solve a quiz, the client sends the POST request to /api/quizzes/{id}/ solve with a JSON that contains the indexes of all chosen options as the answer. This looks like a regular JSON object with key "answer" and value as the array: Example: {"answer": [0,2]}. *Indexes start from 0.

It is also possible to send an empty array [] since some quizzes may not have correct options. The service returns a JSON with two fields: success (true or false) and feedback (just a string). There are three possible responses.

1. If the passed answer is correct: {"success":true,"feedback":"Congratulations, you're right!"}

2. If the answer is incorrect: {"success":false,"feedback":"Wrong answer! Please, try again."}

3. If the specified quiz does not exist, the server returns the 404 (Not found) status code.

A user can delete their quiz by sending the DELETE request to /api/quizzes/{id}.

*If the operation was successful, the service returns the 204 (No content) status code without any content.

*If the specified quiz does not exist, the server returns 404 (Not found).

*If the specified user is not the author of this quiz, the response is the 403 (Forbidden) status code.

To getting all completions of quizzes for a specified user by sending the GET request to /api/quizzes/completed together with the user auth data.

Here I use Spring Boot freamework of Java.

• Spring Boot Web - Build RESTful web service.
• Spring Boot Security - Securing Web.
• Spring Boot Data JPA - Accessing database.
• H2 - Lightweight In-Memory database written in Java.
• IntelliJ Idea - Awesome and Powerful IDE for Java!

Distributed under the MIT License. See LICENSE for more information.

Abul Basar - @basharkhan6 - [email protected]

Project Link: https://github.com/basharkhan6/Web_Quiz_Engine