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// Copyright (C) 2012 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.server.change;
import com.google.common.base.Joiner;
import com.google.common.collect.Lists;
import com.google.gerrit.extensions.registration.DynamicMap;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.ChildCollection;
import com.google.gerrit.extensions.restapi.IdString;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestView;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.client.RevId;
import com.google.gerrit.reviewdb.server.ReviewDb;
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.permissions.ChangePermission;
import com.google.gerrit.server.permissions.PermissionBackend;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import org.eclipse.jgit.lib.ObjectId;
@Singleton
public class Revisions implements ChildCollection<ChangeResource, RevisionResource> {
private final DynamicMap<RestView<RevisionResource>> views;
private final Provider<ReviewDb> dbProvider;
private final ChangeEditUtil editUtil;
private final PatchSetUtil psUtil;
private final PermissionBackend permissionBackend;
@Inject
Revisions(
DynamicMap<RestView<RevisionResource>> views,
Provider<ReviewDb> dbProvider,
ChangeEditUtil editUtil,
PatchSetUtil psUtil,
PermissionBackend permissionBackend) {
this.views = views;
this.dbProvider = dbProvider;
this.editUtil = editUtil;
this.psUtil = psUtil;
this.permissionBackend = permissionBackend;
}
@Override
public DynamicMap<RestView<RevisionResource>> views() {
return views;
}
@Override
public RestView<ChangeResource> list() throws ResourceNotFoundException {
throw new ResourceNotFoundException();
}
@Override
public RevisionResource parse(ChangeResource change, IdString id)
throws ResourceNotFoundException, AuthException, OrmException, IOException,
PermissionBackendException {
if (id.get().equals("current")) {
PatchSet ps = psUtil.current(dbProvider.get(), change.getNotes());
if (ps != null && visible(change)) {
return new RevisionResource(change, ps).doNotCache();
}
throw new ResourceNotFoundException(id);
}
List<RevisionResource> match = Lists.newArrayListWithExpectedSize(2);
for (RevisionResource rsrc : find(change, id.get())) {
if (visible(change)) {
match.add(rsrc);
}
}
switch (match.size()) {
case 0:
throw new ResourceNotFoundException(id);
case 1:
return match.get(0);
default:
throw new ResourceNotFoundException(
"Multiple patch sets for \"" + id.get() + "\": " + Joiner.on("; ").join(match));
}
}
private boolean visible(ChangeResource change) throws PermissionBackendException {
try {
permissionBackend
.user(change.getUser())
.change(change.getNotes())
.database(dbProvider)
.check(ChangePermission.READ);
return true;
} catch (AuthException e) {
return false;
}
}
private List<RevisionResource> find(ChangeResource change, String id)
throws OrmException, IOException, AuthException {
if (id.equals("0") || id.equals("edit")) {
return loadEdit(change, null);
} else if (id.length() < 6 && id.matches("^[1-9][0-9]{0,4}$")) {
// Legacy patch set number syntax.
return byLegacyPatchSetId(change, id);
} else if (id.length() < 4 || id.length() > RevId.LEN) {
// Require a minimum of 4 digits.
// Impossibly long identifier will never match.
return Collections.emptyList();
} else {
List<RevisionResource> out = new ArrayList<>();
for (PatchSet ps : psUtil.byChange(dbProvider.get(), change.getNotes())) {
if (ps.getRevision() != null && ps.getRevision().get().startsWith(id)) {
out.add(new RevisionResource(change, ps));
}
}
// Not an existing patch set on a change, but might be an edit.
if (out.isEmpty() && id.length() == RevId.LEN) {
return loadEdit(change, new RevId(id));
}
return out;
}
}
private List<RevisionResource> byLegacyPatchSetId(ChangeResource change, String id)
throws OrmException {
PatchSet ps =
psUtil.get(
dbProvider.get(),
change.getNotes(),
new PatchSet.Id(change.getId(), Integer.parseInt(id)));
if (ps != null) {
return Collections.singletonList(new RevisionResource(change, ps));
}
return Collections.emptyList();
}
private List<RevisionResource> loadEdit(ChangeResource change, RevId revid)
throws AuthException, IOException {
Optional<ChangeEdit> edit = editUtil.byChange(change.getNotes(), change.getUser());
if (edit.isPresent()) {
PatchSet ps = new PatchSet(new PatchSet.Id(change.getId(), 0));
RevId editRevId = new RevId(ObjectId.toString(edit.get().getEditCommit()));
ps.setRevision(editRevId);
if (revid == null || editRevId.equals(revid)) {
return Collections.singletonList(new RevisionResource(change, ps, edit));
}
}
return Collections.emptyList();
}
}
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