org.apache.tools.ant.taskdefs.condition.IsSigned Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.tools.ant.taskdefs.condition;
import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.ManifestTask;
import org.apache.tools.ant.types.DataType;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
/**
* Checks whether a jarfile is signed: if the name of the
* signature is passed, the file is checked for presence of that
* particular signature; otherwise the file is checked for the
* existence of any signature.
*/
public class IsSigned extends DataType implements Condition {
private static final String SIG_START = "META-INF/";
private static final String SIG_END = ".SF";
private static final int SHORT_SIG_LIMIT = 8;
private String name;
private File file;
/**
* The jarfile that is to be tested for the presence
* of a signature.
* @param file jarfile to be tested.
*/
public void setFile(File file) {
this.file = file;
}
/**
* The signature name to check jarfile for.
* @param name signature to look for.
*/
public void setName(String name) {
this.name = name;
}
/**
* Returns true if the file exists and is signed with
* the signature specified, or, if name wasn't
* specified, if the file contains a signature.
* @param zipFile the zipfile to check
* @param name the signature to check (may be killed)
* @return true if the file is signed.
* @throws IOException on error
*/
public static boolean isSigned(File zipFile, String name)
throws IOException {
try (ZipFile jarFile = new ZipFile(zipFile)) {
if (null == name) {
Enumeration entries = jarFile.getEntries();
while (entries.hasMoreElements()) {
String eName = entries.nextElement().getName();
if (eName.startsWith(SIG_START)
&& eName.endsWith(SIG_END)) {
return true;
}
}
return false;
}
name = replaceInvalidChars(name);
boolean shortSig = jarFile.getEntry(SIG_START
+ name.toUpperCase()
+ SIG_END) != null;
boolean longSig = false;
if (name.length() > SHORT_SIG_LIMIT) {
longSig = jarFile.getEntry(
SIG_START
+ name.substring(0, SHORT_SIG_LIMIT).toUpperCase()
+ SIG_END) != null;
}
return shortSig || longSig;
}
}
/**
* Returns true if the file exists and is signed with
* the signature specified, or, if name wasn't
* specified, if the file contains a signature.
* @return true if the file is signed.
*/
@Override
public boolean eval() {
if (file == null) {
throw new BuildException("The file attribute must be set.");
}
if (!file.exists()) {
log("The file \"" + file.getAbsolutePath()
+ "\" does not exist.", Project.MSG_VERBOSE);
return false;
}
boolean r = false;
try {
r = isSigned(file, name);
} catch (IOException e) {
log("Got IOException reading file \"" + file.getAbsolutePath()
+ "\"" + e, Project.MSG_WARN);
}
if (r) {
log("File \"" + file.getAbsolutePath() + "\" is signed.",
Project.MSG_VERBOSE);
}
return r;
}
private static String replaceInvalidChars(final String name) {
StringBuilder sb = new StringBuilder();
final int len = name.length();
boolean changes = false;
for (int i = 0; i < len; i++) {
final char ch = name.charAt(i);
if (ManifestTask.VALID_ATTRIBUTE_CHARS.indexOf(ch) < 0) {
sb.append("_");
changes = true;
} else {
sb.append(ch);
}
}
return changes ? sb.toString() : name;
}
}