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- /*
- * Copyright (C) 2009-2010, Google Inc. and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
- package org.eclipse.jgit.http.server;
-
- import static javax.servlet.http.HttpServletResponse.SC_NOT_FOUND;
- import static javax.servlet.http.HttpServletResponse.SC_NOT_MODIFIED;
- import static org.eclipse.jgit.http.server.ServletUtils.getRepository;
- import static org.eclipse.jgit.util.HttpSupport.HDR_ETAG;
- import static org.eclipse.jgit.util.HttpSupport.HDR_IF_MODIFIED_SINCE;
- import static org.eclipse.jgit.util.HttpSupport.HDR_IF_NONE_MATCH;
- import static org.eclipse.jgit.util.HttpSupport.HDR_LAST_MODIFIED;
-
- import java.io.File;
- import java.io.FileNotFoundException;
- import java.io.IOException;
- import java.time.Instant;
-
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
-
- import org.eclipse.jgit.internal.storage.file.ObjectDirectory;
- import org.eclipse.jgit.lib.Repository;
-
- /** Sends any object from {@code GIT_DIR/objects/??/0 38}, or any pack file. */
- abstract class ObjectFileServlet extends HttpServlet {
- private static final long serialVersionUID = 1L;
-
- static class Loose extends ObjectFileServlet {
- private static final long serialVersionUID = 1L;
-
- Loose() {
- super("application/x-git-loose-object");
- }
-
- @Override
- String etag(FileSender sender) throws IOException {
- Instant lastModified = sender.getLastModified();
- return Long.toHexString(lastModified.getEpochSecond())
- + Long.toHexString(lastModified.getNano());
- }
- }
-
- private abstract static class PackData extends ObjectFileServlet {
- private static final long serialVersionUID = 1L;
-
- PackData(String contentType) {
- super(contentType);
- }
-
- @Override
- String etag(FileSender sender) throws IOException {
- return sender.getTailChecksum();
- }
- }
-
- static class Pack extends PackData {
- private static final long serialVersionUID = 1L;
-
- Pack() {
- super("application/x-git-packed-objects");
- }
- }
-
- static class PackIdx extends PackData {
- private static final long serialVersionUID = 1L;
-
- PackIdx() {
- super("application/x-git-packed-objects-toc");
- }
- }
-
- private final String contentType;
-
- ObjectFileServlet(String contentType) {
- this.contentType = contentType;
- }
-
- abstract String etag(FileSender sender) throws IOException;
-
- /** {@inheritDoc} */
- @Override
- public void doGet(final HttpServletRequest req,
- final HttpServletResponse rsp) throws IOException {
- serve(req, rsp, true);
- }
-
- /** {@inheritDoc} */
- @Override
- protected void doHead(final HttpServletRequest req,
- final HttpServletResponse rsp) throws ServletException, IOException {
- serve(req, rsp, false);
- }
-
- private void serve(final HttpServletRequest req,
- final HttpServletResponse rsp, final boolean sendBody)
- throws IOException {
- final File obj = new File(objects(req), req.getPathInfo());
- final FileSender sender;
- try {
- sender = new FileSender(obj);
- } catch (FileNotFoundException e) {
- rsp.sendError(SC_NOT_FOUND);
- return;
- }
-
- try {
- final String etag = etag(sender);
- // HTTP header Last-Modified header has a resolution of 1 sec, see
- // https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.29
- final long lastModified = sender.getLastModified().getEpochSecond();
-
- String ifNoneMatch = req.getHeader(HDR_IF_NONE_MATCH);
- if (etag != null && etag.equals(ifNoneMatch)) {
- rsp.sendError(SC_NOT_MODIFIED);
- return;
- }
-
- long ifModifiedSince = req.getDateHeader(HDR_IF_MODIFIED_SINCE);
- if (0 < lastModified && lastModified < ifModifiedSince) {
- rsp.sendError(SC_NOT_MODIFIED);
- return;
- }
-
- if (etag != null)
- rsp.setHeader(HDR_ETAG, etag);
- if (0 < lastModified)
- rsp.setDateHeader(HDR_LAST_MODIFIED, lastModified);
- rsp.setContentType(contentType);
- sender.serve(req, rsp, sendBody);
- } finally {
- sender.close();
- }
- }
-
- private static File objects(HttpServletRequest req) {
- final Repository db = getRepository(req);
- return ((ObjectDirectory) db.getObjectDatabase()).getDirectory();
- }
- }
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