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// Copyright (C) 2013 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.query.change;
import com.google.common.collect.ImmutableList;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.entities.Account;
import com.google.gerrit.entities.AccountGroup;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.LabelType;
import com.google.gerrit.entities.LabelTypes;
import com.google.gerrit.entities.PatchSetApproval;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.index.query.PostFilterPredicate;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.account.AccountResolver;
import com.google.gerrit.server.account.AccountState;
import com.google.gerrit.server.index.change.ChangeField;
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.ProjectCache;
import com.google.gerrit.server.project.ProjectState;
import com.google.gerrit.server.query.change.ChangeData.StorageConstraint;
import java.io.IOException;
import java.util.Optional;
import org.eclipse.jgit.errors.ConfigInvalidException;
public class EqualsLabelPredicates {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
public static class PostFilterEqualsLabelPredicate extends PostFilterPredicate {
private final Matcher matcher;
public PostFilterEqualsLabelPredicate(
LabelPredicate.Args args, String label, int expVal, @Nullable Integer count) {
super(ChangeQueryBuilder.FIELD_LABEL, ChangeField.formatLabel(label, expVal, count));
matcher = new Matcher(args, label, expVal, count);
}
@Override
public boolean match(ChangeData object) {
return matcher.match(object);
}
@Override
public int getCost() {
return 2;
}
}
public static class IndexEqualsLabelPredicate extends ChangeIndexPostFilterPredicate {
private final Matcher matcher;
public IndexEqualsLabelPredicate(
LabelPredicate.Args args, String label, int expVal, @Nullable Integer count) {
this(args, label, expVal, null, count);
}
public IndexEqualsLabelPredicate(
LabelPredicate.Args args,
String label,
int expVal,
@Nullable Account.Id account,
@Nullable Integer count) {
super(ChangeField.LABEL_SPEC, ChangeField.formatLabel(label, expVal, account, count));
this.matcher = new Matcher(args, label, expVal, account, count);
}
@Override
public boolean match(ChangeData object) {
return matcher.match(object);
}
@Override
public int getCost() {
return 1 + (matcher.group == null ? 0 : 1);
}
}
private static class Matcher {
protected final AccountResolver accountResolver;
protected final ProjectCache projectCache;
protected final PermissionBackend permissionBackend;
protected final IdentifiedUser.GenericFactory userFactory;
/** label name to be matched. */
protected final String label;
/** Expected vote value for the label. */
protected final int expVal;
/**
* Number of times the value {@link #expVal} for label {@link #label} should occur. If null,
* match with any count greater or equal to 1.
*/
@Nullable protected final Integer count;
/** Account ID that has voted on the label. */
@Nullable protected final Account.Id account;
protected final AccountGroup.UUID group;
public Matcher(LabelPredicate.Args args, String label, int expVal, @Nullable Integer count) {
this(args, label, expVal, null, count);
}
public Matcher(
LabelPredicate.Args args,
String label,
int expVal,
@Nullable Account.Id account,
@Nullable Integer count) {
this.permissionBackend = args.permissionBackend;
this.accountResolver = args.accountResolver;
this.projectCache = args.projectCache;
this.userFactory = args.userFactory;
this.group = args.group;
this.label = label;
this.expVal = expVal;
this.account = account;
this.count = count;
}
public boolean match(ChangeData cd) {
Change c = cd.change();
if (c == null) {
// The change has disappeared.
logger.atFine().log(
"%s=%s doesn't match because the change has disappeared.", label, expVal);
return false;
}
if (Integer.valueOf(0).equals(count)) {
// We don't match against count=0 so that the computation is identical to the stored values
// in the index. We do that since computing count=0 requires looping on all {label_type,
// vote_value} for the change and storing a {count=0} format for it in the change index
// which is computationally expensive.
logger.atFine().log(
"%s=%s doesn't match change %s because the count was specified as 0 which is not"
+ " supported.",
label, expVal, cd.change().getChangeId());
return false;
}
Optional project = projectCache.get(c.getDest().project());
if (!project.isPresent()) {
// The project has disappeared.
logger.atFine().log(
"%s=%s doesn't match change %s because its project %s has disappeared.",
label, expVal, cd.change().getChangeId(), c.getDest().project().get());
return false;
}
LabelType labelType = type(project.get().getLabelTypes(), label);
if (labelType == null) {
logger.atFine().log(
"%s=%s doesn't match change %s because the label is not defined by its project %s"
+ " (label type = %s)",
label, expVal, cd.change().getChangeId(), project.get(), project.get().getLabelTypes());
return false; // Label is not defined by this project.
}
boolean hasVote = false;
int matchingVotes = 0;
StorageConstraint currentStorageConstraint = cd.getStorageConstraint();
cd.setStorageConstraint(ChangeData.StorageConstraint.INDEX_PRIMARY_NOTEDB_SECONDARY);
for (PatchSetApproval psa : cd.currentApprovals()) {
if (labelType.matches(psa)) {
hasVote = true;
if (match(cd, psa)) {
matchingVotes += 1;
}
}
}
logger.atFine().log(
"found %s matching votes for %s=%s on change %s (current approvals = %s)",
matchingVotes, label, expVal, cd.change().getChangeId(), cd.currentApprovals());
cd.setStorageConstraint(currentStorageConstraint);
if (!hasVote && expVal == 0) {
logger.atFine().log(
"%s=%s matches change %s because there is no vote for label %s",
label, expVal, cd.change().getChangeId(), label);
return true;
}
if (count == null) {
if (matchingVotes >= 1) {
logger.atFine().log(
"%s=%s matches change %s because there are %s matching votes (count was not"
+ " specified, hence 1 or more votes are needed)",
label, expVal, cd.change().getChangeId(), matchingVotes);
return true;
}
logger.atFine().log(
"%s=%s doesn't match change %s because there are no matching votes (count was not"
+ " specified, hence 1 or more votes are needed)",
label, expVal, cd.change().getChangeId());
return false;
}
if (matchingVotes == count) {
logger.atFine().log(
"%s=%s matches change %s because there are %s matching votes which matches the"
+ " expected count %s",
label, expVal, cd.change().getChangeId(), matchingVotes, count);
return true;
}
logger.atFine().log(
"%s=%s doesn't match change %s because there are %s matching votes which doesn't match"
+ " the expected count %s",
label, expVal, cd.change().getChangeId(), matchingVotes, count);
return false;
}
private boolean match(ChangeData cd, PatchSetApproval psa) {
if (psa.value() != expVal) {
logger.atFine().log(
"vote %s on change %s doesn't match expected value %s",
psa, cd.change().getChangeId(), expVal);
return false;
}
Account.Id approver = psa.accountId();
if (account != null) {
// case when account in query is numeric
if (!account.equals(approver) && !isMagicUser()) {
logger.atFine().log(
"vote %s on change %s doesn't match expected approver %s",
psa, cd.change().getChangeId(), account);
return false;
}
// case when account in query = owner
if (account.equals(ChangeQueryBuilder.OWNER_ACCOUNT_ID)
&& !cd.change().getOwner().equals(approver)) {
logger.atFine().log(
"vote %s on change %s doesn't match since it is not from the change owner %s",
psa, cd.change().getChangeId(), cd.change().getOwner());
return false;
}
// case when account in query = non_uploader
if (account.equals(ChangeQueryBuilder.NON_UPLOADER_ACCOUNT_ID)
&& cd.currentPatchSet().uploader().equals(approver)) {
logger.atFine().log(
"vote %s on change %s doesn't match since it is not from the uploader %s",
psa, cd.change().getChangeId(), cd.currentPatchSet().uploader());
return false;
}
if (account.equals(ChangeQueryBuilder.NON_CONTRIBUTOR_ACCOUNT_ID)) {
if ((cd.currentPatchSet().uploader().equals(approver)
|| matchAccount(cd.getCommitter().getEmailAddress(), approver)
|| matchAccount(cd.getAuthor().getEmailAddress(), approver))) {
logger.atFine().log(
"vote %s on change %s doesn't match since it is not from a contributor"
+ " (uploader: %s, committer: %s, author: %s)",
psa,
cd.change().getChangeId(),
cd.currentPatchSet().uploader(),
cd.getCommitter().getEmailAddress(),
cd.getAuthor().getEmailAddress());
return false;
}
}
}
IdentifiedUser reviewer = userFactory.create(approver);
if (group != null && !reviewer.getEffectiveGroups().contains(group)) {
logger.atFine().log(
"vote %s on change %s doesn't match since the approver %s is not a member of the"
+ " expected group %s",
psa, cd.change().getChangeId(), approver, group);
return false;
}
// Check the user has 'READ' permission.
try {
PermissionBackend.ForChange perm = permissionBackend.absentUser(approver).change(cd);
if (!projectCache.get(cd.project()).map(ProjectState::statePermitsRead).orElse(false)) {
logger.atFine().log(
"vote %s on change %s doesn't match since the project %s doesn't permit read",
psa, cd.change().getChangeId(), cd.project().get());
return false;
}
perm.check(ChangePermission.READ);
logger.atFine().log("vote %s on change %s matches", psa, cd.change().getChangeId());
return true;
} catch (PermissionBackendException | AuthException e) {
logger.atFine().log(
"vote %s on change %s doesn't match because the approver %s has no read access",
psa, cd.change().getChangeId(), approver);
return false;
}
}
/**
* Returns true if the {@code email} parameter belongs to the account identified by the {@code
* accountId} parameter.
*/
private boolean matchAccount(String email, Account.Id accountId) {
try {
ImmutableList accountsList = accountResolver.resolve(email).asList();
return accountsList.stream().anyMatch(c -> c.account().id().equals(accountId));
} catch (ConfigInvalidException | IOException e) {
logger.atWarning().withCause(e).log("Failed to resolve account %s", email);
}
return false;
}
private boolean isMagicUser() {
return account != null
&& (account.equals(ChangeQueryBuilder.OWNER_ACCOUNT_ID)
|| account.equals(ChangeQueryBuilder.NON_UPLOADER_ACCOUNT_ID)
|| account.equals(ChangeQueryBuilder.NON_CONTRIBUTOR_ACCOUNT_ID));
}
}
@Nullable
public static LabelType type(LabelTypes types, String toFind) {
if (types.byLabel(toFind).isPresent()) {
return types.byLabel(toFind).get();
}
for (LabelType lt : types.getLabelTypes()) {
if (toFind.equalsIgnoreCase(lt.getName())) {
return lt;
}
}
return null;
}
}
