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// Copyright (C) 2016 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.project;
import com.google.common.base.Throwables;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.gerrit.common.data.AccessSection;
import com.google.gerrit.common.data.RefConfigSection;
import com.google.gerrit.common.errors.InvalidNameException;
import dk.brics.automaton.RegExp;
import java.util.concurrent.ExecutionException;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import org.eclipse.jgit.lib.Repository;
public class RefPattern {
public static final String USERID_SHARDED = "shardeduserid";
public static final String USERNAME = "username";
private static final LoadingCache<String, String> exampleCache =
CacheBuilder.newBuilder()
.maximumSize(4000)
.build(
new CacheLoader<String, String>() {
@Override
public String load(String refPattern) {
return example(refPattern);
}
});
public static String shortestExample(String refPattern) {
if (isRE(refPattern)) {
try {
return exampleCache.get(refPattern);
} catch (ExecutionException e) {
Throwables.throwIfUnchecked(e.getCause());
throw new RuntimeException(e);
}
} else if (refPattern.endsWith("/*")) {
return refPattern.substring(0, refPattern.length() - 1) + '1';
} else {
return refPattern;
}
}
static String example(String refPattern) {
// Since Brics will substitute dot [.] with \0 when generating
// shortest example, any usage of dot will fail in
// Repository.isValidRefName() if not combined with star [*].
// To get around this, we substitute the \0 with an arbitrary
// accepted character.
return toRegExp(refPattern).toAutomaton().getShortestExample(true).replace('\0', '-');
}
public static boolean isRE(String refPattern) {
return refPattern.startsWith(AccessSection.REGEX_PREFIX);
}
public static RegExp toRegExp(String refPattern) {
if (isRE(refPattern)) {
refPattern = refPattern.substring(1);
}
return new RegExp(refPattern, RegExp.NONE);
}
public static void validate(String refPattern) throws InvalidNameException {
if (refPattern.startsWith(RefConfigSection.REGEX_PREFIX)) {
if (!Repository.isValidRefName(shortestExample(refPattern))) {
throw new InvalidNameException(refPattern);
}
} else if (refPattern.equals(RefConfigSection.ALL)) {
// This is a special case we have to allow, it fails below.
} else if (refPattern.endsWith("/*")) {
String prefix = refPattern.substring(0, refPattern.length() - 2);
if (!Repository.isValidRefName(prefix)) {
throw new InvalidNameException(refPattern);
}
} else if (!Repository.isValidRefName(refPattern)) {
throw new InvalidNameException(refPattern);
}
validateRegExp(refPattern);
}
public static void validateRegExp(String refPattern) throws InvalidNameException {
try {
refPattern = refPattern.replace("${" + USERID_SHARDED + "}", "");
refPattern = refPattern.replace("${" + USERNAME + "}", "");
Pattern.compile(refPattern);
} catch (PatternSyntaxException e) {
throw new InvalidNameException(refPattern + " " + e.getMessage());
}
}
}
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