| // Copyright 2019 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| package com.google.gitiles; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import com.google.common.collect.ImmutableMap; |
| import com.google.gitiles.GitilesRequestFailureException.FailureReason; |
| import java.io.IOException; |
| import java.util.Map; |
| import javax.servlet.FilterChain; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import org.eclipse.jgit.errors.AmbiguousObjectException; |
| import org.eclipse.jgit.errors.RepositoryNotFoundException; |
| import org.eclipse.jgit.transport.ServiceMayNotContinueException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** Convert exceptions into HTTP response. */ |
| public class DefaultErrorHandlingFilter extends AbstractHttpFilter { |
| private static final Logger log = LoggerFactory.getLogger(DefaultErrorHandlingFilter.class); |
| |
| /** HTTP header that indicates an error detail. */ |
| public static final String GITILES_ERROR = "X-Gitiles-Error"; |
| |
| private Renderer renderer; |
| |
| public DefaultErrorHandlingFilter(Renderer renderer) { |
| this.renderer = renderer; |
| } |
| |
| @Override |
| public void doFilter(HttpServletRequest req, HttpServletResponse res, FilterChain chain) |
| throws IOException, ServletException { |
| try { |
| chain.doFilter(req, res); |
| } catch (GitilesRequestFailureException e) { |
| try { |
| res.setHeader(GITILES_ERROR, e.getReason().toString()); |
| renderHtml(req, res, e.getReason().getHttpStatusCode(), e.getPublicErrorMessage()); |
| } catch (IOException e2) { |
| e.addSuppressed(e2); |
| throw e; |
| } |
| } catch (RepositoryNotFoundException e) { |
| try { |
| renderHtml(req, res, FailureReason.REPOSITORY_NOT_FOUND); |
| } catch (IOException e2) { |
| e.addSuppressed(e2); |
| throw e; |
| } |
| } catch (AmbiguousObjectException e) { |
| try { |
| renderHtml(req, res, FailureReason.AMBIGUOUS_OBJECT); |
| } catch (IOException e2) { |
| e.addSuppressed(e2); |
| throw e; |
| } |
| } catch (ServiceMayNotContinueException e) { |
| try { |
| renderHtml(req, res, e.getStatusCode(), e.getMessage()); |
| } catch (IOException e2) { |
| e.addSuppressed(e2); |
| throw e; |
| } |
| } catch (IOException | ServletException e) { |
| try { |
| log.warn("Internal server error", e); |
| renderHtml(req, res, FailureReason.INTERNAL_SERVER_ERROR); |
| } catch (IOException e2) { |
| e.addSuppressed(e2); |
| throw e; |
| } |
| } |
| } |
| |
| private void renderHtml(HttpServletRequest req, HttpServletResponse res, FailureReason reason) |
| throws IOException { |
| res.setHeader(GITILES_ERROR, reason.toString()); |
| renderHtml(req, res, reason.getHttpStatusCode(), reason.getMessage()); |
| } |
| |
| private void renderHtml( |
| HttpServletRequest req, HttpServletResponse res, int status, String message) |
| throws IOException { |
| res.setStatus(status); |
| renderHtml(req, res, "gitiles.error", ImmutableMap.of("title", message)); |
| } |
| |
| protected void renderHtml( |
| HttpServletRequest req, HttpServletResponse res, String templateName, Map<String, ?> soyData) |
| throws IOException { |
| renderer.renderHtml(req, res, templateName, startHtmlResponse(req, res, soyData)); |
| } |
| |
| private Map<String, ?> startHtmlResponse( |
| HttpServletRequest req, HttpServletResponse res, Map<String, ?> soyData) { |
| res.setContentType(FormatType.HTML.getMimeType()); |
| res.setCharacterEncoding(UTF_8.name()); |
| BaseServlet.setNotCacheable(res); |
| Map<String, Object> allData = BaseServlet.getData(req); |
| allData.putAll(soyData); |
| return allData; |
| } |
| } |