This service is used to manage loan application from customers and collect emi from customers

Import file Aspire-mini-loan-service.postman_collection.json into Postman

Use Intellij Idea Ultimate

Only works with JAVA 17

1. Allow customer to request for new Loan
2. Allow admin to view and approve/decline Loan
3. Allow customer to Submit weekly loan repayments
4. Allow customer to view upcoming loan repayment(installment)
5. Generate repayments with PENDING state
6. Policy to make sure customer can view his own loan only
7. Policy to verify amount is greater than or equal to scheudled payment
8. Loan statuc become PAID when all amount is paid back

1. Appropriate exception and error code with message for wrong or not allowed requests
2. Authentication before login
3. Admin can see all users loan
4. Every rest api has Triple authentication
5. First it authenticates the user, then it checks if user belongs to the appropriate group, third, if user has the access

• The new repayment will be generated only when last repayment is paid
• This is, to dynamically allow customer to pay any amount greater than installment.
• Using this, customer can close the loan in one go also

• The user authentication details are saved in-memory in SecurityConfig.java for prototyping
• To switch to different user, simply update the Basic Auth details from user1 to user2 in postman

• user1 : userpass : CUSTOMER
• user2 : userpass : CUSTOMER
• admin1 : adminpass : ADMIN

build : ./gradlew clean build

test : ./gradlew clean test

run : ./gradlew clean run

• To switch to different user, simply update the Basic Auth details from user1 to user2 in postman

• HttpStatus.FORBIDDEN : 403 -> when customer1 request for loan data of customer 2
• HttpStatus.NOT_FOUND : 404 -> when loanId doesn't exist
• HttpStatus.NOT_ACCEPTABLE : 406 -> when loan status is not appropriate

Command to run all the tests(20+ tests) : ./gradlew clean test

• AdminLoanControllerApiTest.java
• CustomerLoanControllerApiTest.java

• LoanServiceUTest.java

• InstallmentRepositoryITest.java
• LoanRepositoryITest.java

type : h2 in-memory embedded database

Note : First I used postgres, but to make the application run simpler, migrated to h2 embedded db

loan

installment

1. Postman Collection
2. Test Cases -> Service Unit Test, Controller API test, Repository Integration Test
3. Error Codes With Proper Message -> Appropriate mapping of exception to error codes
4. All in one application with DB integration
5. Docker support
6. Authentication, Authorisation(grp based) and access policy