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// Copyright (C) 2022 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;
import com.google.auto.value.AutoValue;
import com.google.common.collect.Iterables;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.entities.Patch;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.patch.DiffNotAvailableException;
import com.google.gerrit.server.patch.DiffOperations;
import com.google.gerrit.server.patch.DiffOptions;
import com.google.gerrit.server.patch.FilePathAdapter;
import com.google.gerrit.server.patch.Text;
import com.google.gerrit.server.patch.filediff.FileDiffOutput;
import com.google.gerrit.server.patch.filediff.TaggedEdit;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.query.change.SubmitRequirementPredicate;
import com.google.inject.assistedinject.Assisted;
import com.google.inject.assistedinject.AssistedInject;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import org.eclipse.jgit.diff.Edit;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.TreeWalk;
/**
* A submit-requirement predicate that can be used in submit requirements expressions. This
* predicate is fulfilled if the diff between the latest patchset of the change and the base commit
* includes a specific file path pattern with some specific content modification. The modification
* could be an added, deleted or replaced content.
*/
public class FileEditsPredicate extends SubmitRequirementPredicate {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private DiffOperations diffOperations;
private GitRepositoryManager repoManager;
private final FileEditsArgs fileEditsArgs;
public interface Factory {
FileEditsPredicate create(FileEditsArgs fileEditsArgs);
}
@AutoValue
public abstract static class FileEditsArgs {
abstract String filePattern();
abstract String editPattern();
public static FileEditsArgs create(String filePattern, String contentPattern) {
return new AutoValue_FileEditsPredicate_FileEditsArgs(filePattern, contentPattern);
}
}
@AssistedInject
public FileEditsPredicate(
DiffOperations diffOperations,
GitRepositoryManager repoManager,
@Assisted FileEditsPredicate.FileEditsArgs fileEditsArgs) {
super("fileEdits", fileEditsArgs.filePattern() + "," + fileEditsArgs.editPattern());
this.diffOperations = diffOperations;
this.repoManager = repoManager;
this.fileEditsArgs = fileEditsArgs;
}
@Override
public boolean match(ChangeData cd) {
try {
Map<String, FileDiffOutput> modifiedFiles =
diffOperations.listModifiedFilesAgainstParent(
cd.project(),
cd.currentPatchSet().commitId(),
/* parentNum= */ 0,
DiffOptions.DEFAULTS);
FileDiffOutput firstDiff =
Iterables.getFirst(modifiedFiles.values(), /* defaultValue= */ null);
if (firstDiff == null) {
// No available diffs. We cannot identify old and new commit IDs.
// engine.fail();
return false;
}
Pattern filePattern = null;
Pattern editPattern = null;
if (fileEditsArgs.filePattern().startsWith("^")) {
// We validated the pattern before creating this predicate. No need to revalidate.
String pattern = fileEditsArgs.filePattern();
filePattern = Pattern.compile(pattern);
}
if (fileEditsArgs.editPattern().startsWith("^")) {
// We validated the pattern before creating this predicate. No need to revalidate.
String pattern = fileEditsArgs.editPattern();
editPattern = Pattern.compile(pattern);
}
try (Repository repo = repoManager.openRepository(cd.project());
ObjectReader reader = repo.newObjectReader();
RevWalk rw = new RevWalk(reader)) {
RevTree aTree =
firstDiff.oldCommitId().equals(ObjectId.zeroId())
? null
: rw.parseTree(firstDiff.oldCommitId());
RevTree bTree = rw.parseCommit(firstDiff.newCommitId()).getTree();
for (FileDiffOutput entry : modifiedFiles.values()) {
String newName =
FilePathAdapter.getNewPath(entry.oldPath(), entry.newPath(), entry.changeType());
String oldName = FilePathAdapter.getOldPath(entry.oldPath(), entry.changeType());
if (Patch.isMagic(newName)) {
continue;
}
if (match(newName, fileEditsArgs.filePattern(), filePattern)
|| (oldName != null && match(oldName, fileEditsArgs.filePattern(), filePattern))) {
List<Edit> edits =
entry.edits().stream().map(TaggedEdit::jgitEdit).collect(Collectors.toList());
if (edits.isEmpty()) {
continue;
}
Text tA;
if (oldName != null) {
tA = load(aTree, oldName, reader);
} else {
tA = load(aTree, newName, reader);
}
Text tB = load(bTree, newName, reader);
for (Edit edit : edits) {
if (tA != Text.EMPTY) {
String aDiff = tA.getString(edit.getBeginA(), edit.getEndA(), true);
if (match(aDiff, fileEditsArgs.editPattern(), editPattern)) {
return true;
}
}
if (tB != Text.EMPTY) {
String bDiff = tB.getString(edit.getBeginB(), edit.getEndB(), true);
if (match(bDiff, fileEditsArgs.editPattern(), editPattern)) {
return true;
}
}
}
}
}
} catch (IOException e) {
logger.atSevere().withCause(e).log("Error while evaluating commit edits.");
return false;
}
} catch (DiffNotAvailableException e) {
logger.atSevere().withCause(e).log("Diff error while evaluating commit edits.");
return false;
}
return false;
}
@Override
public int getCost() {
return 10;
}
private Text load(@Nullable ObjectId tree, String path, ObjectReader reader) throws IOException {
if (tree == null || path == null) {
return Text.EMPTY;
}
final TreeWalk tw = TreeWalk.forPath(reader, path, tree);
if (tw == null) {
return Text.EMPTY;
}
if (tw.getFileMode(0).getObjectType() != Constants.OBJ_BLOB) {
return Text.EMPTY;
}
return new Text(reader.open(tw.getObjectId(0), Constants.OBJ_BLOB));
}
private boolean match(String text, String search, @Nullable Pattern searchPattern) {
return searchPattern == null ? text.contains(search) : searchPattern.matcher(text).find();
}
}
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