Add exception mapper for InvalidFormatException.

This exception is thrown for example when an enum in the input could not
be found. This is an invalid input and therefore should not result in an
internal server error.

scm-webapp/src/test/java/sonia/scm/api/InvalidFormatExceptionMapperTest.java

@@ -0,0 +1,74 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.api;
+
+import org.jboss.resteasy.mock.MockDispatcherFactory;
+import org.jboss.resteasy.mock.MockHttpRequest;
+import org.jboss.resteasy.mock.MockHttpResponse;
+import org.jboss.resteasy.spi.Dispatcher;
+import org.junit.jupiter.api.Test;
+
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import java.io.UnsupportedEncodingException;
+import java.net.URISyntaxException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class InvalidFormatExceptionMapperTest {
+
+  @Test
+  void shouldMapInvalidFormatExceptionDueToInvalidEnum() throws URISyntaxException, UnsupportedEncodingException {
+    Dispatcher dispatcher = MockDispatcherFactory.createDispatcher();
+    dispatcher.getRegistry().addSingletonResource(new SimpleResource());
+    dispatcher.getProviderFactory().registerProvider(InvalidFormatExceptionMapper.class);
+
+    MockHttpRequest request = MockHttpRequest
+      .post("/")
+      .contentType("application/json")
+      .content("{\"e\": \"NONE\"}".getBytes());
+    MockHttpResponse response = new MockHttpResponse();
+
+    dispatcher.invoke(request, response);
+
+    assertThat(response.getStatus()).isEqualTo(400);
+    assertThat(response.getContentAsString()).contains("2qRyyaVcJ1");
+  }
+
+  @Path("/")
+  static class SimpleResource {
+    @POST
+    public void post(ObjectWithEnum o) {
+    }
+  }
+
+  static class ObjectWithEnum {
+    public Enum e;
+  }
+
+  enum Enum {
+    ONE, TWO
+  }
+}