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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 jakarta.servlet.http.HttpServletResponse.SC_NOT_FOUND;
import static jakarta.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 jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.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;
@Override
public void doGet(final HttpServletRequest req,
final HttpServletResponse rsp) throws IOException {
serve(req, rsp, true);
}
@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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