JDK8/Java8源码在线阅读
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.jndi.ldap;
import javax.naming.*;
import javax.naming.directory.*;
import javax.naming.spi.DirectoryManager;
import javax.naming.spi.DirStateFactory;
import java.io.IOException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.io.InputStream;
import java.util.Hashtable;
import java.util.Vector;
import java.util.StringTokenizer;
import sun.misc.BASE64Encoder;
import sun.misc.BASE64Decoder;
import java.lang.reflect.Proxy;
import java.lang.reflect.Modifier;
/**
* Class containing static methods and constants for dealing with
* encoding/decoding JNDI References and Serialized Objects
* in LDAP.
* @author Vincent Ryan
* @author Rosanna Lee
*/
final class Obj {
private Obj () {}; // Make sure no one can create one
// package private; used by Connection
static VersionHelper helper = VersionHelper.getVersionHelper();
// LDAP attributes used to support Java objects.
static final String[] JAVA_ATTRIBUTES = {
"objectClass",
"javaSerializedData",
"javaClassName",
"javaFactory",
"javaCodeBase",
"javaReferenceAddress",
"javaClassNames",
"javaRemoteLocation" // Deprecated
};
static final int OBJECT_CLASS = 0;
static final int SERIALIZED_DATA = 1;
static final int CLASSNAME = 2;
static final int FACTORY = 3;
static final int CODEBASE = 4;
static final int REF_ADDR = 5;
static final int TYPENAME = 6;
/**
* @deprecated
*/
@Deprecated
private static final int REMOTE_LOC = 7;
// LDAP object classes to support Java objects
static final String[] JAVA_OBJECT_CLASSES = {
"javaContainer",
"javaObject",
"javaNamingReference",
"javaSerializedObject",
"javaMarshalledObject",
};
static final String[] JAVA_OBJECT_CLASSES_LOWER = {
"javacontainer",
"javaobject",
"javanamingreference",
"javaserializedobject",
"javamarshalledobject",
};
static final int STRUCTURAL = 0; // structural object class
static final int BASE_OBJECT = 1; // auxiliary java object class
static final int REF_OBJECT = 2; // auxiliary reference object class
static final int SER_OBJECT = 3; // auxiliary serialized object class
static final int MAR_OBJECT = 4; // auxiliary marshalled object class
/**
* Encode an object in LDAP attributes.
* Supports binding Referenceable or Reference, Serializable,
* and DirContext.
*
* If the object supports the Referenceable interface then encode
* the reference to the object. See encodeReference() for details.
*<p>
* If the object is serializable, it is stored as follows:
* javaClassName
* value: Object.getClass();
* javaSerializedData
* value: serialized form of Object (in binary form).
* javaTypeName
* value: getTypeNames(Object.getClass());
*/
private static Attributes encodeObject(char separator,
Object obj, Attributes attrs,
Attribute objectClass, boolean cloned)
throws NamingException {
boolean structural =
(objectClass.size() == 0 ||
(objectClass.size() == 1 && objectClass.contains("top")));
if (structural) {
objectClass.add(JAVA_OBJECT_CLASSES[STRUCTURAL]);
}
// References
if (obj instanceof Referenceable) {
objectClass.add(JAVA_OBJECT_CLASSES[BASE_OBJECT]);
objectClass.add(JAVA_OBJECT_CLASSES[REF_OBJECT]);
if (!cloned) {
attrs = (Attributes)attrs.clone();
}
attrs.put(objectClass);
return (encodeReference(separator,
((Referenceable)obj).getReference(),
attrs, obj));
} else if (obj instanceof Reference) {
objectClass.add(JAVA_OBJECT_CLASSES[BASE_OBJECT]);
objectClass.add(JAVA_OBJECT_CLASSES[REF_OBJECT]);
if (!cloned) {
attrs = (Attributes)attrs.clone();
}
attrs.put(objectClass);
return (encodeReference(separator, (Reference)obj, attrs, null));
// Serializable Object
} else if (obj instanceof java.io.Serializable) {
objectClass.add(JAVA_OBJECT_CLASSES[BASE_OBJECT]);
if (!(objectClass.contains(JAVA_OBJECT_CLASSES[MAR_OBJECT]) ||
objectClass.contains(JAVA_OBJECT_CLASSES_LOWER[MAR_OBJECT]))) {
objectClass.add(JAVA_OBJECT_CLASSES[SER_OBJECT]);
}
if (!cloned) {
attrs = (Attributes)attrs.clone();
}
attrs.put(objectClass);
attrs.put(new BasicAttribute(JAVA_ATTRIBUTES[SERIALIZED_DATA],
serializeObject(obj)));
if (attrs.get(JAVA_ATTRIBUTES[CLASSNAME]) == null) {
attrs.put(JAVA_ATTRIBUTES[CLASSNAME],
obj.getClass().getName());
}
if (attrs.get(JAVA_ATTRIBUTES[TYPENAME]) == null) {
Attribute tAttr =
LdapCtxFactory.createTypeNameAttr(obj.getClass());
if (tAttr != null) {
attrs.put(tAttr);
}
}
// DirContext Object
} else if (obj instanceof DirContext) {
// do nothing
} else {
throw new IllegalArgumentException(
"can only bind Referenceable, Serializable, DirContext");
}
// System.err.println(attrs);
return attrs;
}
/**
* Each value in javaCodebase contains a list of space-separated
* URLs. Each value is independent; we can pick any of the values
* so we just use the first one.
* @return an array of URL strings for the codebase
*/
private static String[] getCodebases(Attribute codebaseAttr) throws
NamingException {
if (codebaseAttr == null) {
return null;
} else {
StringTokenizer parser =
new StringTokenizer((String)codebaseAttr.get());
Vector<String> vec = new Vector<>(10);
while (parser.hasMoreTokens()) {
vec.addElement(parser.nextToken());
}
String[] answer = new String[vec.size()];
for (int i = 0; i < answer.length; i++) {
answer[i] = vec.elementAt(i);
}
return answer;
}
}
/*
* Decode an object from LDAP attribute(s).
* The object may be a Reference, or a Serialized object.
*
* See encodeObject() and encodeReference() for details on formats
* expected.
*/
static Object decodeObject(Attributes attrs)
throws NamingException {
Attribute attr;
// Get codebase, which is used in all 3 cases.
String[] codebases = getCodebases(attrs.get(JAVA_ATTRIBUTES[CODEBASE]));
try {
if ((attr = attrs.get(JAVA_ATTRIBUTES[SERIALIZED_DATA])) != null) {
ClassLoader cl = helper.getURLClassLoader(codebases);
return deserializeObject((byte[])attr.get(), cl);
} else if ((attr = attrs.get(JAVA_ATTRIBUTES[REMOTE_LOC])) != null) {
// For backward compatibility only
return decodeRmiObject(
(String)attrs.get(JAVA_ATTRIBUTES[CLASSNAME]).get(),
(String)attr.get(), codebases);
}
attr = attrs.get(JAVA_ATTRIBUTES[OBJECT_CLASS]);
if (attr != null &&
(attr.contains(JAVA_OBJECT_CLASSES[REF_OBJECT]) ||
attr.contains(JAVA_OBJECT_CLASSES_LOWER[REF_OBJECT]))) {
return decodeReference(attrs, codebases);
}
return null;
} catch (IOException e) {
NamingException ne = new NamingException();
ne.setRootCause(e);
throw ne;
}
}
/**
* Convert a Reference object into several LDAP attributes.
*
* A Reference is stored as into the following attributes:
* javaClassName
* value: Reference.getClassName();
* javaFactory
* value: Reference.getFactoryClassName();
* javaCodeBase
* value: Reference.getFactoryClassLocation();
* javaReferenceAddress
* value: #0#typeA#valA
* value: #1#typeB#valB
* value: #2#typeC##[serialized RefAddr C]
* value: #3#typeD#valD
*
* where
* - the first character denotes the separator
* - the number following the first separator denotes the position
* of the RefAddr within the Reference
* - "typeA" is RefAddr.getType()
* - ## denotes that the Base64-encoded form of the non-StringRefAddr
* is to follow; otherwise the value that follows is
* StringRefAddr.getContents()
*
* The default separator is the hash character (#).
* May provide property for this in future.
*/
private static Attributes encodeReference(char separator,
Reference ref, Attributes attrs, Object orig)
throws NamingException {
if (ref == null)
return attrs;
String s;
if ((s = ref.getClassName()) != null) {
attrs.put(new BasicAttribute(JAVA_ATTRIBUTES[CLASSNAME], s));
}
if ((s = ref.getFactoryClassName()) != null) {
attrs.put(new BasicAttribute(JAVA_ATTRIBUTES[FACTORY], s));
}
if ((s = ref.getFactoryClassLocation()) != null) {
attrs.put(new BasicAttribute(JAVA_ATTRIBUTES[CODEBASE], s));
}
// Get original object's types if caller has not explicitly
// specified other type names
if (orig != null && attrs.get(JAVA_ATTRIBUTES[TYPENAME]) != null) {
Attribute tAttr =
LdapCtxFactory.createTypeNameAttr(orig.getClass());
if (tAttr != null) {
attrs.put(tAttr);
}
}
int count = ref.size();
if (count > 0) {
Attribute refAttr = new BasicAttribute(JAVA_ATTRIBUTES[REF_ADDR]);
RefAddr refAddr;
BASE64Encoder encoder = null;
for (int i = 0; i < count; i++) {
refAddr = ref.get(i);
if (refAddr instanceof StringRefAddr) {
refAttr.add(""+ separator + i +
separator + refAddr.getType() +
separator + refAddr.getContent());
} else {
if (encoder == null)
encoder = new BASE64Encoder();
refAttr.add(""+ separator + i +
separator + refAddr.getType() +
separator + separator +
encoder.encodeBuffer(serializeObject(refAddr)));
}
}
attrs.put(refAttr);
}
return attrs;
}
/*
* A RMI object is stored in the directory as
* javaClassName
* value: Object.getClass();
* javaRemoteLocation
* value: URL of RMI object (accessed through the RMI Registry)
* javaCodebase:
* value: URL of codebase of where to find classes for object
*
* Return the RMI Location URL itself. This will be turned into
* an RMI object when getObjectInstance() is called on it.
* %%% Ignore codebase for now. Depend on RMI registry to send code.-RL
* @deprecated For backward compatibility only
*/
private static Object decodeRmiObject(String className,
String rmiName, String[] codebases) throws NamingException {
return new Reference(className, new StringRefAddr("URL", rmiName));
}
/*
* Restore a Reference object from several LDAP attributes
*/
private static Reference decodeReference(Attributes attrs,
String[] codebases) throws NamingException, IOException {
Attribute attr;
String className;
String factory = null;
if ((attr = attrs.get(JAVA_ATTRIBUTES[CLASSNAME])) != null) {
className = (String)attr.get();
} else {
throw new InvalidAttributesException(JAVA_ATTRIBUTES[CLASSNAME] +
" attribute is required");
}
if ((attr = attrs.get(JAVA_ATTRIBUTES[FACTORY])) != null) {
factory = (String)attr.get();
}
Reference ref = new Reference(className, factory,
(codebases != null? codebases[0] : null));
/*
* string encoding of a RefAddr is either:
*
* #posn#<type>#<address>
* or
* #posn#<type>##<base64-encoded address>
*/
if ((attr = attrs.get(JAVA_ATTRIBUTES[REF_ADDR])) != null) {
String val, posnStr, type;
char separator;
int start, sep, posn;
BASE64Decoder decoder = null;
ClassLoader cl = helper.getURLClassLoader(codebases);
/*
* Temporary Vector for decoded RefAddr addresses - used to ensure
* unordered addresses are correctly re-ordered.
*/
Vector<RefAddr> refAddrList = new Vector<>();
refAddrList.setSize(attr.size());
for (NamingEnumeration<?> vals = attr.getAll(); vals.hasMore(); ) {
val = (String)vals.next();
if (val.length() == 0) {
throw new InvalidAttributeValueException(
"malformed " + JAVA_ATTRIBUTES[REF_ADDR] + " attribute - "+
"empty attribute value");
}
// first character denotes encoding separator
separator = val.charAt(0);
start = 1; // skip over separator
// extract position within Reference
if ((sep = val.indexOf(separator, start)) < 0) {
throw new InvalidAttributeValueException(
"malformed " + JAVA_ATTRIBUTES[REF_ADDR] + " attribute - " +
"separator '" + separator + "'" + "not found");
}
if ((posnStr = val.substring(start, sep)) == null) {
throw new InvalidAttributeValueException(
"malformed " + JAVA_ATTRIBUTES[REF_ADDR] + " attribute - " +
"empty RefAddr position");
}
try {
posn = Integer.parseInt(posnStr);
} catch (NumberFormatException nfe) {
throw new InvalidAttributeValueException(
"malformed " + JAVA_ATTRIBUTES[REF_ADDR] + " attribute - " +
"RefAddr position not an integer");
}
start = sep + 1; // skip over position and trailing separator
// extract type
if ((sep = val.indexOf(separator, start)) < 0) {
throw new InvalidAttributeValueException(
"malformed " + JAVA_ATTRIBUTES[REF_ADDR] + " attribute - " +
"RefAddr type not found");
}
if ((type = val.substring(start, sep)) == null) {
throw new InvalidAttributeValueException(
"malformed " + JAVA_ATTRIBUTES[REF_ADDR] + " attribute - " +
"empty RefAddr type");
}
start = sep + 1; // skip over type and trailing separator
// extract content
if (start == val.length()) {
// Empty content
refAddrList.setElementAt(new StringRefAddr(type, null), posn);
} else if (val.charAt(start) == separator) {
// Double separators indicate a non-StringRefAddr
// Content is a Base64-encoded serialized RefAddr
++start; // skip over consecutive separator
// %%% RL: exception if empty after double separator
if (decoder == null)
decoder = new BASE64Decoder();
RefAddr ra = (RefAddr)
deserializeObject(
decoder.decodeBuffer(val.substring(start)),
cl);
refAddrList.setElementAt(ra, posn);
} else {
// Single separator indicates a StringRefAddr
refAddrList.setElementAt(new StringRefAddr(type,
val.substring(start)), posn);
}
}
// Copy to real reference
for (int i = 0; i < refAddrList.size(); i++) {
ref.add(refAddrList.elementAt(i));
}
}
return (ref);
}
/*
* Serialize an object into a byte array
*/
private static byte[] serializeObject(Object obj) throws NamingException {
try {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
try (ObjectOutputStream serial = new ObjectOutputStream(bytes)) {
serial.writeObject(obj);
}
return (bytes.toByteArray());
} catch (IOException e) {
NamingException ne = new NamingException();
ne.setRootCause(e);
throw ne;
}
}
/*
* Deserializes a byte array into an object.
*/
private static Object deserializeObject(byte[] obj, ClassLoader cl)
throws NamingException {
try {
// Create ObjectInputStream for deserialization
ByteArrayInputStream bytes = new ByteArrayInputStream(obj);
try (ObjectInputStream deserial = cl == null ?
new ObjectInputStream(bytes) :
new LoaderInputStream(bytes, cl)) {
return deserial.readObject();
} catch (ClassNotFoundException e) {
NamingException ne = new NamingException();
ne.setRootCause(e);
throw ne;
}
} catch (IOException e) {
NamingException ne = new NamingException();
ne.setRootCause(e);
throw ne;
}
}
/**
* Returns the attributes to bind given an object and its attributes.
*/
static Attributes determineBindAttrs(
char separator, Object obj, Attributes attrs, boolean cloned,
Name name, Context ctx, Hashtable<?,?> env)
throws NamingException {
// Call state factories to convert object and attrs
DirStateFactory.Result res =
DirectoryManager.getStateToBind(obj, name, ctx, env, attrs);
obj = res.getObject();
attrs = res.getAttributes();
// We're only storing attributes; no further processing required
if (obj == null) {
return attrs;
}
//if object to be bound is a DirContext extract its attributes
if ((attrs == null) && (obj instanceof DirContext)) {
cloned = true;
attrs = ((DirContext)obj).getAttributes("");
}
boolean ocNeedsCloning = false;
// Create "objectClass" attribute
Attribute objectClass;
if (attrs == null || attrs.size() == 0) {
attrs = new BasicAttributes(LdapClient.caseIgnore);
cloned = true;
// No objectclasses supplied, use "top" to start
objectClass = new BasicAttribute("objectClass", "top");
} else {
// Get existing objectclass attribute
objectClass = attrs.get("objectClass");
if (objectClass == null && !attrs.isCaseIgnored()) {
// %%% workaround
objectClass = attrs.get("objectclass");
}
// No objectclasses supplied, use "top" to start
if (objectClass == null) {
objectClass = new BasicAttribute("objectClass", "top");
} else if (ocNeedsCloning || !cloned) {
objectClass = (Attribute)objectClass.clone();
}
}
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