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Git aware HTTP server implementation.

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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 java.nio.charset.StandardCharsets.UTF_8;
import static org.eclipse.jgit.http.server.ServletUtils.getRepository;

import java.io.IOException;
import java.io.OutputStreamWriter;

import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.RefAdvertiser;
import org.eclipse.jgit.util.HttpSupport;

/** Send a complete list of current refs, including peeled values for tags. */
class InfoRefsServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@Override
	public void doGet(final HttpServletRequest req,
			final HttpServletResponse rsp) throws IOException {
		// Assume a dumb client and send back the dumb client
		// version of the info/refs file.
		rsp.setContentType(HttpSupport.TEXT_PLAIN);
		rsp.setCharacterEncoding(UTF_8.name());

		final Repository db = getRepository(req);
		try (OutputStreamWriter out = new OutputStreamWriter(
				new SmartOutputStream(req, rsp, true),
				UTF_8)) {
			final RefAdvertiser adv = new RefAdvertiser() {
				@Override
				protected void writeOne(CharSequence line)
						throws IOException {
					// Whoever decided that info/refs should use a different
					// delimiter than the native git:// protocol shouldn't
					// be allowed to design this sort of stuff. :-(
					out.append(line.toString().replace(' ', '\t'));
				}

				@Override
				protected void end() {
					// No end marker required for info/refs format.
				}
			};
			adv.init(db);
			adv.setDerefTags(true);
			adv.send(db.getRefDatabase().getRefsByPrefix(Constants.R_REFS));
		}
	}
}