blob: 657edf8ced4d1ae484ab98d4222e42d42f419936 [file] [log] [blame]
// Copyright 2012 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 com.google.common.base.Preconditions.checkNotNull;
import static javax.servlet.http.HttpServletResponse.SC_NOT_FOUND;
import com.google.common.io.BaseEncoding;
import com.google.gitiles.CommitData.Field;
import com.google.gitiles.DateFormatter.Format;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
import java.util.Arrays;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jgit.diff.DiffFormatter;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
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.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.AbstractTreeIterator;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;
import org.eclipse.jgit.treewalk.EmptyTreeIterator;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.treewalk.filter.PathFilter;
/** Serves an HTML page with all the diffs for a commit. */
public class DiffServlet extends BaseServlet {
private static final long serialVersionUID = 1L;
private final Linkifier linkifier;
public DiffServlet(GitilesAccess.Factory accessFactory, Renderer renderer, Linkifier linkifier) {
super(renderer, accessFactory);
this.linkifier = checkNotNull(linkifier, "linkifier");
}
@Override
protected void doGetHtml(HttpServletRequest req, HttpServletResponse res) throws IOException {
GitilesView view = ViewFilter.getView(req);
Repository repo = ServletUtils.getRepository(req);
try (RevWalk walk = new RevWalk(repo);
TreeWalk tw = newTreeWalk(walk, view)) {
boolean showCommit;
boolean isFile;
AbstractTreeIterator oldTree;
AbstractTreeIterator newTree;
try {
if (tw == null && !view.getPathPart().isEmpty()) {
res.setStatus(SC_NOT_FOUND);
return;
}
isFile = tw != null && isFile(tw);
// If we are viewing the diff between a commit and one of its parents,
// include the commit detail in the rendered page.
showCommit = isParentOf(walk, view.getOldRevision(), view.getRevision());
oldTree = getTreeIterator(walk, view.getOldRevision().getId());
newTree = getTreeIterator(walk, view.getRevision().getId());
} catch (MissingObjectException | IncorrectObjectTypeException e) {
res.setStatus(SC_NOT_FOUND);
return;
}
Map<String, Object> data = getData(req);
data.put("title", "Diff - " + view.getRevisionRange());
if (showCommit) {
Set<Field> fs = CommitSoyData.DEFAULT_FIELDS;
if (isFile) {
fs = Field.setOf(fs, Field.PARENT_BLAME_URL);
}
GitilesAccess access = getAccess(req);
DateFormatter df = new DateFormatter(access, Format.DEFAULT);
data.put(
"commit",
new CommitSoyData()
.setLinkifier(linkifier)
.setArchiveFormat(getArchiveFormat(access))
.toSoyData(req, walk.parseCommit(view.getRevision().getId()), fs, df));
}
if (!data.containsKey("repositoryName") && (view.getRepositoryName() != null)) {
data.put("repositoryName", view.getRepositoryName());
}
if (!data.containsKey("breadcrumbs")) {
data.put("breadcrumbs", view.getBreadcrumbs());
}
setCacheHeaders(req, res);
try (OutputStream out = startRenderStreamingHtml(req, res, "gitiles.diffDetail", data);
DiffFormatter diff = new HtmlDiffFormatter(renderer, view, out)) {
formatDiff(repo, oldTree, newTree, view.getPathPart(), diff);
}
}
}
@Override
protected void doGetText(HttpServletRequest req, HttpServletResponse res) throws IOException {
GitilesView view = ViewFilter.getView(req);
Repository repo = ServletUtils.getRepository(req);
try (RevWalk walk = new RevWalk(repo)) {
AbstractTreeIterator oldTree;
AbstractTreeIterator newTree;
try {
oldTree = getTreeIterator(walk, view.getOldRevision().getId());
newTree = getTreeIterator(walk, view.getRevision().getId());
} catch (MissingObjectException | IncorrectObjectTypeException e) {
res.setStatus(SC_NOT_FOUND);
return;
}
try (Writer writer = startRenderText(req, res);
OutputStream out = BaseEncoding.base64().encodingStream(writer);
DiffFormatter diff = new DiffFormatter(out)) {
formatDiff(repo, oldTree, newTree, view.getPathPart(), diff);
}
}
}
private static TreeWalk newTreeWalk(RevWalk walk, GitilesView view) throws IOException {
if (view.getPathPart().isEmpty()) {
return null;
}
return TreeWalk.forPath(
walk.getObjectReader(), view.getPathPart(), walk.parseTree(view.getRevision().getId()));
}
private static boolean isParentOf(RevWalk walk, Revision oldRevision, Revision newRevision)
throws MissingObjectException, IncorrectObjectTypeException, IOException {
RevCommit newCommit = walk.parseCommit(newRevision.getId());
if (newCommit.getParentCount() > 0) {
return Arrays.asList(newCommit.getParents()).contains(oldRevision.getId());
}
return oldRevision == Revision.NULL;
}
private static boolean isFile(TreeWalk tw) {
return (tw.getRawMode(0) & FileMode.TYPE_FILE) > 0;
}
private static void formatDiff(
Repository repo,
AbstractTreeIterator oldTree,
AbstractTreeIterator newTree,
String path,
DiffFormatter diff)
throws IOException {
if (!path.isEmpty()) {
diff.setPathFilter(PathFilter.create(path));
}
diff.setRepository(repo);
diff.setDetectRenames(true);
diff.format(oldTree, newTree);
}
private static AbstractTreeIterator getTreeIterator(RevWalk walk, ObjectId id)
throws IOException {
if (!id.equals(ObjectId.zeroId())) {
CanonicalTreeParser p = new CanonicalTreeParser();
p.reset(walk.getObjectReader(), walk.parseTree(id));
return p;
}
return new EmptyTreeIterator();
}
}