juplo.de Git - demos/kafka/chat/blob - src/main/java/de/juplo/kafka/chat/backend/api/ChatBackendControllerAdvice.java

   1 package de.juplo.kafka.chat.backend.api;
   2
   3 import de.juplo.kafka.chat.backend.domain.MessageMutationException;
   4 import org.springframework.beans.factory.annotation.Value;
   5 import org.springframework.http.HttpStatus;
   6 import org.springframework.http.ProblemDetail;
   7 import org.springframework.web.bind.annotation.ControllerAdvice;
   8 import org.springframework.web.bind.annotation.ExceptionHandler;
   9 import org.springframework.web.server.ServerWebExchange;
  10 import org.springframework.web.util.UriComponentsBuilder;
  11
  12 import java.util.Date;
  13
  14
  15 @ControllerAdvice
  16 public class ChatBackendControllerAdvice
  17 {
  18   @Value("${server.context-path:/}")
  19   String contextPath;
  20
  21   @ExceptionHandler(MessageMutationException.class)
  22   public final ProblemDetail handleException(
  23       MessageMutationException e,
  24       ServerWebExchange exchange,
  25       UriComponentsBuilder uriComponentsBuilder)
  26   {
  27     final HttpStatus status = HttpStatus.BAD_REQUEST;
  28     ProblemDetail problem = ProblemDetail.forStatus(status);
  29
  30     problem.setProperty("timestamp", new Date());
  31
  32     problem.setProperty("requestId", exchange.getRequest().getId());
  33
  34     problem.setType(uriComponentsBuilder.replacePath(contextPath).path("/problem/message-mutation").build().toUri());
  35     StringBuilder stringBuilder = new StringBuilder();
  36     stringBuilder.append(status.getReasonPhrase());
  37     stringBuilder.append(" - ");
  38     stringBuilder.append(e.getMessage());
  39     problem.setTitle(stringBuilder.toString());
  40
  41     stringBuilder.setLength(0);
  42     stringBuilder.append("The existing message with user=");
  43     stringBuilder.append(e.getExisting().getUser());
  44     stringBuilder.append(" and id=");
  45     stringBuilder.append(e.getExisting().getId());
  46     stringBuilder.append(" cannot be mutated!");
  47     problem.setDetail(stringBuilder.toString());
  48
  49     problem.setProperty("mutatedMessage", e.getMutated());
  50
  51     problem.setProperty("existingMessage", e.getExisting());
  52
  53     return problem;
  54   }
  55 }