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SpotBugs: Because it's easy!
/*
* FindBugs - Find Bugs in Java programs
* Copyright (C) 2003-2008 University of Maryland
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package edu.umd.cs.findbugs;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.Iterator;
import edu.umd.cs.findbugs.ba.SignatureParser;
import edu.umd.cs.findbugs.internalAnnotations.DottedClassName;
/**
* @author pugh
*/
public class Obfuscate {
final static String HASH_SEED = SystemProperties.getProperty("hashSeed", "");
public static String hashData(String in) {
MessageDigest md;
try {
md = MessageDigest.getInstance("SHA-1");
byte[] hash = md.digest((HASH_SEED + in).getBytes(StandardCharsets.UTF_8));
return String.format("%040x", new BigInteger(1, hash));
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static String hashFilename(String fileName) {
int lastDot = fileName.lastIndexOf('.');
if (lastDot >= 0) {
String suffix = fileName.substring(lastDot);
return hashData(fileName.substring(0, lastDot)) + suffix;
}
return hashData(fileName);
}
public static String hashClass(@DottedClassName String className) {
if (className.startsWith("java")) {
return className;
}
return "obfuscated.H" + hashData(className);
}
public static String hashSignature(String signature) {
char firstChar = signature.charAt(0);
switch (firstChar) {
case '[':
return '[' + hashSignature(signature.substring(1));
case 'V':
case 'Z':
case 'B':
case 'S':
case 'C':
case 'I':
case 'J':
case 'D':
case 'F':
if (signature.length() == 1) {
return signature;
}
throw new IllegalArgumentException("bad signature: " + signature);
case 'L':
if (!signature.endsWith(";")) {
throw new IllegalArgumentException("bad signature: " + signature);
}
return hashFieldSignature(signature);
default:
throw new IllegalArgumentException("bad signature: " + signature);
}
}
public static String hashFieldSignature(String signature) {
signature = signature.substring(1, signature.length() - 1);
if (!signature.startsWith("java")) {
signature = "obfuscated/H" + hashData(signature);
}
return "L" + signature + ";";
}
public static String hashMethodSignature(String signature) {
SignatureParser parser = new SignatureParser(signature);
StringBuilder buf = new StringBuilder("(");
for (Iterator i = parser.parameterSignatureIterator(); i.hasNext();) {
String param = i.next();
buf.append(hashSignature(param));
}
buf.append(")");
buf.append(hashSignature(parser.getReturnTypeSignature()));
return buf.toString();
}
static MethodAnnotation obfuscate(MethodAnnotation m) {
String className = m.getClassName();
if (className.startsWith("java")) {
return m;
}
String methodName = m.getMethodName();
String methodSignature = m.getMethodSignature();
if ("hashCode".equals(methodName) && "()I".equals(methodSignature) || "equals".equals(methodName)
&& "(Ljava/lang/Object;)Z".equals(methodSignature) || "compareTo".equals(methodName)
&& "(Ljava/lang/Object;)I".equals(methodSignature) || "".equals(methodName)
|| "".equals(methodName)) {
// don't need to obfuscate method name
} else {
methodName = hashData(methodName);
}
MethodAnnotation result = new MethodAnnotation(hashClass(className), methodName, hashMethodSignature(methodSignature),
m.isStatic());
result.setDescription(m.getDescription());
return result;
}
static FieldAnnotation obfuscate(FieldAnnotation m) {
FieldAnnotation result = new FieldAnnotation(hashClass(m.getClassName()), hashData(m.getFieldName()),
hashSignature(m.getFieldSignature()), m.isStatic());
result.setDescription(m.getDescription());
return result;
}
static ClassAnnotation obfuscate(ClassAnnotation m) {
ClassAnnotation result = new ClassAnnotation(hashClass(m.getClassName()));
result.setDescription(m.getDescription());
return result;
}
static TypeAnnotation obfuscate(TypeAnnotation m) {
TypeAnnotation result = new TypeAnnotation(hashSignature(m.getTypeDescriptor()));
result.setDescription(m.getDescription());
return result;
}
static IntAnnotation obfuscate(IntAnnotation m) {
IntAnnotation result = new IntAnnotation(m.getValue());
result.setDescription(m.getDescription());
return result;
}
static StringAnnotation obfuscate(StringAnnotation m) {
StringAnnotation result = new StringAnnotation("obfuscated: " + hashData(m.getValue()));
result.setDescription(m.getDescription());
return result;
}
static SourceLineAnnotation obfuscate(SourceLineAnnotation m) {
SourceLineAnnotation result = new SourceLineAnnotation(hashClass(m.getClassName()), hashFilename(m.getSourceFile()),
m.getStartLine(), m.getEndLine(), m.getStartBytecode(), m.getEndBytecode());
result.setDescription(m.getDescription());
return result;
}
static LocalVariableAnnotation obfuscate(LocalVariableAnnotation m) {
LocalVariableAnnotation result = new LocalVariableAnnotation(hashData(m.getName()), m.getRegister(), m.getPC());
result.setDescription(m.getDescription());
return result;
}
public static BugInstance obfuscate(BugInstance b) {
final BugInstance result = new BugInstance(b.getType(), b.getPriority());
BugAnnotationVisitor visitor = new BugAnnotationVisitor() {
@Override
public void visitTypeAnnotation(TypeAnnotation typeAnnotation) {
result.add(obfuscate(typeAnnotation));
}
@Override
public void visitStringAnnotation(StringAnnotation stringAnnotation) {
result.add(obfuscate(stringAnnotation));
}
@Override
public void visitSourceLineAnnotation(SourceLineAnnotation sourceLineAnnotation) {
result.add(obfuscate(sourceLineAnnotation));
}
@Override
public void visitMethodAnnotation(MethodAnnotation methodAnnotation) {
result.add(obfuscate(methodAnnotation));
}
@Override
public void visitLocalVariableAnnotation(LocalVariableAnnotation fieldAnnotation) {
result.add(obfuscate(fieldAnnotation));
}
@Override
public void visitIntAnnotation(IntAnnotation fieldAnnotation) {
result.add(obfuscate(fieldAnnotation));
}
@Override
public void visitFieldAnnotation(FieldAnnotation fieldAnnotation) {
result.add(obfuscate(fieldAnnotation));
}
@Override
public void visitClassAnnotation(ClassAnnotation classAnnotation) {
result.add(obfuscate(classAnnotation));
}
};
for (BugAnnotation a : b.getAnnotations()) {
a.accept(visitor);
}
result.setOldInstanceHash(hashData(b.getInstanceHash()));
result.setHistory(b);
return result;
}
}