com.google.gerrit.httpd.raw.CatServlet Maven / Gradle / Ivy
// Copyright (C) 2009 The Android Open Source Project
//
// 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.gerrit.httpd.raw;
import static com.google.gerrit.server.project.ProjectCache.illegalState;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.Patch;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.Url;
import com.google.gerrit.server.PatchSetUtil;
import com.google.gerrit.server.edit.ChangeEdit;
import com.google.gerrit.server.edit.ChangeEditUtil;
import com.google.gerrit.server.notedb.ChangeNotes;
import com.google.gerrit.server.permissions.ChangePermission;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.project.NoSuchChangeException;
import com.google.gerrit.server.project.ProjectCache;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.Optional;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jgit.lib.ObjectId;
/**
* Exports a single version of a patch as a normal file download.
*
* This can be relatively unsafe with Microsoft Internet Explorer 6.0 as the browser will (rather
* incorrectly) treat an HTML or JavaScript file its supposed to download as though it was served by
* this site, and will execute it with the site's own protection domain. This opens a massive
* security hole so we package the content into a zip file.
*/
@Singleton
public class CatServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private final ChangeEditUtil changeEditUtil;
private final PatchSetUtil psUtil;
private final ChangeNotes.Factory changeNotesFactory;
private final PermissionBackend permissionBackend;
private final ProjectCache projectCache;
@Inject
CatServlet(
ChangeEditUtil ceu,
PatchSetUtil psu,
ChangeNotes.Factory cnf,
PermissionBackend pb,
ProjectCache pc) {
changeEditUtil = ceu;
psUtil = psu;
changeNotesFactory = cnf;
permissionBackend = pb;
projectCache = pc;
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
String keyStr = req.getPathInfo();
// We shouldn't have to do this extra decode pass, but somehow we
// are now receiving our "^1" suffix as "%5E1", which confuses us
// downstream. Other times we get our embedded "," as "%2C", which
// is equally bad. And yet when these happen a "%2F" is left as-is,
// rather than escaped as "%252F", which makes me feel really really
// uncomfortable with a blind decode right here.
//
keyStr = Url.decode(keyStr);
if (!keyStr.startsWith("/")) {
rsp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
keyStr = keyStr.substring(1);
final Patch.Key patchKey;
final int side;
{
final int c = keyStr.lastIndexOf('^');
if (c == 0) {
rsp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
if (c < 0) {
side = 0;
} else {
try {
side = Integer.parseInt(keyStr.substring(c + 1));
keyStr = keyStr.substring(0, c);
} catch (NumberFormatException e) {
rsp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
}
try {
patchKey = Patch.Key.parse(keyStr);
} catch (NumberFormatException e) {
rsp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
}
final Change.Id changeId = patchKey.patchSetId().changeId();
String revision;
try {
ChangeNotes notes = changeNotesFactory.createCheckedUsingIndexLookup(changeId);
permissionBackend.currentUser().change(notes).check(ChangePermission.READ);
projectCache
.get(notes.getProjectName())
.orElseThrow(illegalState(notes.getProjectName()))
.checkStatePermitsRead();
if (patchKey.patchSetId().get() == 0) {
// change edit
Optional edit = changeEditUtil.byChange(notes);
if (edit.isPresent()) {
revision = ObjectId.toString(edit.get().getEditCommit());
} else {
rsp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
} else {
PatchSet patchSet = psUtil.get(notes, patchKey.patchSetId());
if (patchSet == null) {
rsp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
revision = patchSet.commitId().name();
}
} catch (ResourceConflictException | NoSuchChangeException | AuthException e) {
rsp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
} catch (PermissionBackendException | IOException e) {
getServletContext().log("Cannot query database", e);
rsp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
String path = patchKey.fileName();
String restUrl =
String.format(
"%s/changes/%d/revisions/%s/files/%s/download?parent=%d",
req.getContextPath(), changeId.get(), revision, Url.encode(path), side);
rsp.sendRedirect(restUrl);
}
}