com.google.gitiles.ArchiveServlet.java Source code

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Here is the source code for com.google.gitiles.ArchiveServlet.java

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// Copyright 2013 Google Inc. All Rights Reserved.
//
// 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
//
//     http://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 javax.servlet.http.HttpServletResponse.SC_NOT_FOUND;
import static javax.servlet.http.HttpServletResponse.SC_OK;

import com.google.common.base.Optional;
import com.google.common.base.Strings;

import org.eclipse.jgit.api.ArchiveCommand;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.http.server.ServletUtils;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.TreeWalk;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ArchiveServlet extends BaseServlet {
    private static final long serialVersionUID = 1L;

    public ArchiveServlet(GitilesAccess.Factory accessFactory) {
        super(null, accessFactory);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {
        GitilesView view = ViewFilter.getView(req);
        Revision rev = view.getRevision();
        Repository repo = ServletUtils.getRepository(req);

        ObjectId treeId = getTree(view, repo, rev);
        if (treeId.equals(ObjectId.zeroId())) {
            res.sendError(SC_NOT_FOUND);
            return;
        }

        Optional<ArchiveFormat> format = ArchiveFormat.byExtension(view.getExtension(), getAccess(req).getConfig());
        if (!format.isPresent()) {
            res.setStatus(SC_NOT_FOUND);
            return;
        }
        String filename = getFilename(view, rev, view.getExtension());
        setDownloadHeaders(res, filename, format.get().getMimeType());
        res.setStatus(SC_OK);

        try {
            new ArchiveCommand(repo).setFormat(format.get().getRegisteredName()).setTree(treeId)
                    .setOutputStream(res.getOutputStream()).call();
        } catch (GitAPIException e) {
            throw new IOException(e);
        }
    }

    private ObjectId getTree(GitilesView view, Repository repo, Revision rev) throws IOException {
        RevWalk rw = new RevWalk(repo);
        try {
            RevTree tree = rw.parseTree(rev.getId());
            if (Strings.isNullOrEmpty(view.getPathPart())) {
                return tree;
            }
            TreeWalk tw = TreeWalk.forPath(rw.getObjectReader(), view.getPathPart(), tree);
            if (tw == null || tw.getFileMode(0) != FileMode.TREE) {
                return ObjectId.zeroId();
            }
            return tw.getObjectId(0);
        } catch (IncorrectObjectTypeException e) {
            return ObjectId.zeroId();
        } finally {
            rw.release();
        }
    }

    private String getFilename(GitilesView view, Revision rev, String ext) {
        StringBuilder sb = new StringBuilder().append(PathUtil.basename(view.getRepositoryName())).append('-')
                .append(rev.getName());
        if (view.getPathPart() != null) {
            sb.append('-').append(view.getPathPart().replace('/', '-'));
        }
        return sb.append(ext).toString();
    }
}