GlobalExceptionHandler.java

package com.ironhack;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.MissingRequestHeaderException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import jakarta.servlet.ServletException;
import org.springframework.util.MultiValueMap;
import java.util.HashMap;
import java.util.Map;

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<Map<String, String>> handleValidationExceptions(MethodArgumentNotValidException ex) {
        Map<String, String> errors = new HashMap<>();

        ex.getBindingResult().getFieldErrors().forEach(error ->
                errors.put(error.getField(), error.getDefaultMessage()));

        return new ResponseEntity<>(errors, HttpStatus.BAD_REQUEST);
    }

    @ExceptionHandler(MissingRequestHeaderException.class)
    public ResponseEntity<Map<String, String>> handleMissingHeader(MissingRequestHeaderException ex) {
        Map<String, String> error = new HashMap<>();
        error.put("error", "Missing API-Key header. You must provide the 'API-Key' in your request headers.");
        return new ResponseEntity<>(error, HttpStatus.UNAUTHORIZED);
    }

    @ExceptionHandler(RuntimeException.class)
    public ResponseEntity<Map<String, String>> handleRuntimeExceptions(RuntimeException ex) {
        Map<String, String> error = new HashMap<>();
        String message = ex.getMessage();
        error.put("error", message);

        if (message.contains("not found")) {
            return new ResponseEntity<>(error, HttpStatus.NOT_FOUND);
        } else if (message.contains("Invalid API Key")) {
            return new ResponseEntity<>(error, HttpStatus.UNAUTHORIZED);
        } else if (message.contains("Invalid price range")) {
            return new ResponseEntity<>(error, HttpStatus.BAD_REQUEST);
        }

        return new ResponseEntity<>(error, HttpStatus.INTERNAL_SERVER_ERROR);
    }
}