Use mappers for errors

scm-webapp/src/main/java/sonia/scm/api/rest/ContextualExceptionMapper.java

@@ -0,0 +1,36 @@
+package sonia.scm.api.rest;
+
+import com.google.inject.Inject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import sonia.scm.ExceptionWithContext;
+import sonia.scm.api.v2.resources.ExceptionWithContextToErrorDtoMapper;
+import sonia.scm.web.VndMediaType;
+
+import javax.ws.rs.core.Response;
+import javax.ws.rs.ext.ExceptionMapper;
+
+public class ContextualExceptionMapper<E extends Throwable & ExceptionWithContext> implements ExceptionMapper<E> {
+
+  @Inject
+  private ExceptionWithContextToErrorDtoMapper mapper;
+
+  private static final Logger logger = LoggerFactory.getLogger(ContextualExceptionMapper.class);
+
+  private final Response.Status status;
+  private final Class<E> type;
+
+  public ContextualExceptionMapper(Class<E> type, Response.Status status) {
+    this.type = type;
+    this.status = status;
+  }
+
+  @Override
+  public Response toResponse(E exception) {
+    logger.debug("map {} to status code {}", type.getSimpleName(), status.getStatusCode());
+    return Response.status(status)
+      .entity(mapper.map(exception))
+      .type(VndMediaType.ERROR_TYPE)
+      .build();
+  }
+}