com.fasterxml.jackson.module.blackbird.CrossLoaderAccess Maven / Gradle / Ivy
package com.fasterxml.jackson.module.blackbird;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.function.UnaryOperator;
class CrossLoaderAccess implements UnaryOperator {
private static final MethodHandle DEFINE_CLASS, HAS_FULL_ACCESS;
private static final String CLASS_NAME = "$$JacksonBlackbirdAccess";
// Pre-compiled Java 8 bytecode:
// package ;
// public class BlackbirdAccess {
// public static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
// }
private static final int[] HEADER = new int[] {
0xca, 0xfe, 0xba, 0xbe, 0x00, 0x00, 0x00, 0x34, 0x00, 0x1c, 0x0a, 0x00,
0x02, 0x00, 0x03, 0x07, 0x00, 0x04, 0x0c, 0x00, 0x05, 0x00, 0x06, 0x01,
0x00, 0x10, 0x6a, 0x61, 0x76, 0x61, 0x2f, 0x6c, 0x61, 0x6e, 0x67, 0x2f,
0x4f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x01, 0x00, 0x06, 0x3c, 0x69, 0x6e,
0x69, 0x74, 0x3e, 0x01, 0x00, 0x03, 0x28, 0x29, 0x56, 0x0a, 0x00, 0x08,
0x00, 0x09, 0x07, 0x00, 0x0a, 0x0c, 0x00, 0x0b, 0x00, 0x0c, 0x01, 0x00,
0x1e, 0x6a, 0x61, 0x76, 0x61, 0x2f, 0x6c, 0x61, 0x6e, 0x67, 0x2f, 0x69,
0x6e, 0x76, 0x6f, 0x6b, 0x65, 0x2f, 0x4d, 0x65, 0x74, 0x68, 0x6f, 0x64,
0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x73, 0x01, 0x00, 0x06, 0x6c, 0x6f,
0x6f, 0x6b, 0x75, 0x70, 0x01, 0x00, 0x29, 0x28, 0x29, 0x4c, 0x6a, 0x61,
0x76, 0x61, 0x2f, 0x6c, 0x61, 0x6e, 0x67, 0x2f, 0x69, 0x6e, 0x76, 0x6f,
0x6b, 0x65, 0x2f, 0x4d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x48, 0x61, 0x6e,
0x64, 0x6c, 0x65, 0x73, 0x24, 0x4c, 0x6f, 0x6f, 0x6b, 0x75, 0x70, 0x3b,
0x09, 0x00, 0x0e, 0x00, 0x0f, 0x07, 0x00, 0x10, 0x0c, 0x00, 0x11, 0x00,
0x12, 0x01
};
private static final int[] FOOTER = new int[] {
0x01, 0x00, 0x06, 0x4c, 0x4f, 0x4f, 0x4b, 0x55, 0x50, 0x01, 0x00, 0x27,
0x4c, 0x6a, 0x61, 0x76, 0x61, 0x2f, 0x6c, 0x61, 0x6e, 0x67, 0x2f, 0x69,
0x6e, 0x76, 0x6f, 0x6b, 0x65, 0x2f, 0x4d, 0x65, 0x74, 0x68, 0x6f, 0x64,
0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x73, 0x24, 0x4c, 0x6f, 0x6f, 0x6b,
0x75, 0x70, 0x3b, 0x01, 0x00, 0x04, 0x43, 0x6f, 0x64, 0x65, 0x01, 0x00,
0x0f, 0x4c, 0x69, 0x6e, 0x65, 0x4e, 0x75, 0x6d, 0x62, 0x65, 0x72, 0x54,
0x61, 0x62, 0x6c, 0x65, 0x01, 0x00, 0x08, 0x3c, 0x63, 0x6c, 0x69, 0x6e,
0x69, 0x74, 0x3e, 0x01, 0x00, 0x0a, 0x53, 0x6f, 0x75, 0x72, 0x63, 0x65,
0x46, 0x69, 0x6c, 0x65, 0x01, 0x00, 0x14, 0x42, 0x6c, 0x61, 0x63, 0x6b,
0x62, 0x69, 0x72, 0x64, 0x41, 0x63, 0x63, 0x65, 0x73, 0x73, 0x2e, 0x6a,
0x61, 0x76, 0x61, 0x01, 0x00, 0x0c, 0x49, 0x6e, 0x6e, 0x65, 0x72, 0x43,
0x6c, 0x61, 0x73, 0x73, 0x65, 0x73, 0x07, 0x00, 0x1a, 0x01, 0x00, 0x25,
0x6a, 0x61, 0x76, 0x61, 0x2f, 0x6c, 0x61, 0x6e, 0x67, 0x2f, 0x69, 0x6e,
0x76, 0x6f, 0x6b, 0x65, 0x2f, 0x4d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x48,
0x61, 0x6e, 0x64, 0x6c, 0x65, 0x73, 0x24, 0x4c, 0x6f, 0x6f, 0x6b, 0x75,
0x70, 0x01, 0x00, 0x06, 0x4c, 0x6f, 0x6f, 0x6b, 0x75, 0x70, 0x00, 0x21,
0x00, 0x0e, 0x00, 0x02, 0x00, 0x00, 0x00, 0x01, 0x00, 0x19, 0x00, 0x11,
0x00, 0x12, 0x00, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x05, 0x00, 0x06,
0x00, 0x01, 0x00, 0x13, 0x00, 0x00, 0x00, 0x1d, 0x00, 0x01, 0x00, 0x01,
0x00, 0x00, 0x00, 0x05, 0x2a, 0xb7, 0x00, 0x01, 0xb1, 0x00, 0x00, 0x00,
0x01, 0x00, 0x14, 0x00, 0x00, 0x00, 0x06, 0x00, 0x01, 0x00, 0x00, 0x00,
0x01, 0x00, 0x08, 0x00, 0x15, 0x00, 0x06, 0x00, 0x01, 0x00, 0x13, 0x00,
0x00, 0x00, 0x1f, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xb8,
0x00, 0x07, 0xb3, 0x00, 0x0d, 0xb1, 0x00, 0x00, 0x00, 0x01, 0x00, 0x14,
0x00, 0x00, 0x00, 0x06, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02,
0x00, 0x16, 0x00, 0x00, 0x00, 0x02, 0x00, 0x17, 0x00, 0x18, 0x00, 0x00,
0x00, 0x0a, 0x00, 0x01, 0x00, 0x19, 0x00, 0x08, 0x00, 0x1b, 0x00, 0x19
};
static {
MethodHandle defineClass = null, hasFullAccess = null;
try {
defineClass = MethodHandles.lookup().findVirtual(MethodHandles.Lookup.class, "defineClass",
MethodType.methodType(Class.class, byte[].class));
hasFullAccess = MethodHandles.lookup().findVirtual(MethodHandles.Lookup.class, "hasFullPrivilegeAccess",
MethodType.methodType(boolean.class));
} catch (ReflectiveOperationException ign) { }
DEFINE_CLASS = defineClass;
HAS_FULL_ACCESS = hasFullAccess;
}
@Override
public MethodHandles.Lookup apply(MethodHandles.Lookup lookup) {
try {
return grantAccess(lookup);
} catch (IOException | ReflectiveOperationException | RuntimeException e) {
e.printStackTrace();
return lookup;
}
}
private static MethodHandles.Lookup grantAccess(MethodHandles.Lookup lookup) throws IOException, ReflectiveOperationException {
if (DEFINE_CLASS == null || hasFullAccess(lookup)) {
return lookup;
}
return (MethodHandles.Lookup) accessClassIn(lookup).getField("LOOKUP").get(null);
}
private static boolean hasFullAccess(MethodHandles.Lookup lookup) {
try {
return HAS_FULL_ACCESS != null && (boolean) HAS_FULL_ACCESS.invokeExact(lookup);
} catch (RuntimeException | Error e) {
throw e;
} catch (Throwable e) {
throw new RuntimeException(e);
}
}
private static Class accessClassIn(MethodHandles.Lookup lookup) throws IOException, ReflectiveOperationException {
Package pkg = lookup.lookupClass().getPackage();
String accessClassName = pkg.getName() + "." + CLASS_NAME;
ClassLoader lookupClassLoader = lookup.lookupClass().getClassLoader();
try {
return Class.forName(accessClassName, true, lookupClassLoader);
} catch (ClassNotFoundException ign) { }
synchronized (CrossLoaderAccess.class) {
try {
return Class.forName(accessClassName, true, lookupClassLoader);
} catch (ClassNotFoundException ign) { }
String fqcn = pkg.getName()
.replace('.', '/')
+ "/" + CLASS_NAME;
ByteArrayOutputStream classBytes = new ByteArrayOutputStream(HEADER.length + FOOTER.length + fqcn.length() + 16);
DataOutputStream dataOut = new DataOutputStream(classBytes);
for (int b : HEADER) {
dataOut.writeByte(b);
}
dataOut.writeUTF(fqcn);
for (int b : FOOTER) {
dataOut.writeByte(b);
}
try {
return (Class) DEFINE_CLASS.invokeExact(lookup, classBytes.toByteArray());
} catch (RuntimeException | Error | IOException | ReflectiveOperationException e) {
throw e;
} catch (Throwable e) {
throw new RuntimeException(e);
}
}
}
}
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