InstructorsController.java

package edu.ucsb.cs156.frontiers.controllers;

import com.fasterxml.jackson.databind.ObjectMapper;
import edu.ucsb.cs156.frontiers.entities.Instructor;
import edu.ucsb.cs156.frontiers.repositories.InstructorRepository;
import edu.ucsb.cs156.frontiers.utilities.CanonicalFormConverter;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * This is a REST controller for getting information about the instructors. These endpoints are only
 * accessible to instructors with the role "ROLE_ADMIN".
 */
@Tag(name = "Instructors")
@RequestMapping("/api/admin/instructors")
@RestController
@Slf4j
public class InstructorsController extends ApiController {
  @Autowired InstructorRepository instructorRepository;

  @Autowired ObjectMapper mapper;

  /**
   * Create a new Instructor, available only to Admins.
   *
   * @param email the email of the instructor
   * @return the created Instructor
   */
  @Operation(summary = "Create a new Instructor")
  @PreAuthorize("hasRole('ROLE_ADMIN')")
  @PostMapping("/post")
  public Instructor postInstructor(@RequestParam String email) {
    String convertedEmail = CanonicalFormConverter.convertToValidEmail(email);
    Instructor instructor = Instructor.builder().email(convertedEmail).build();
    instructorRepository.save(instructor);
    return instructor;
  }

  /**
   * Get a list of all instructors, available only to Admins.
   *
   * @return a list of all instructors
   */
  @Operation(summary = "List all Instructors")
  @PreAuthorize("hasRole('ROLE_ADMIN')")
  @GetMapping("/get")
  public Iterable<Instructor> allInstructors() {
    Iterable<Instructor> instructors = instructorRepository.findAll();
    return instructors;
  }

  /** Delete an instructor by email, available only to Admins. */
  @Operation(summary = "Delete an Instructor by email")
  @PreAuthorize("hasRole('ROLE_ADMIN')")
  @DeleteMapping("/delete")
  public ResponseEntity<String> deleteInstructor(@RequestParam String email) {
    Instructor instructor = instructorRepository.findById(email).orElse(null);

    if (instructor == null) {
      return ResponseEntity.status(404)
          .body(String.format("Instructor with email %s not found.", email));
    }

    instructorRepository.delete(instructor);
    return ResponseEntity.status(200)
        .body(String.format("Instructor with email %s deleted.", email));
  }
}