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/*
* 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 flex.messaging.io.amf;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import flex.messaging.MessageException;
import flex.messaging.io.AbstractProxy;
import flex.messaging.io.BeanProxy;
import flex.messaging.io.ClassAliasRegistry;
import flex.messaging.io.PropertyProxy;
import flex.messaging.io.PropertyProxyRegistry;
import flex.messaging.io.SerializationContext;
import flex.messaging.io.SerializationException;
import flex.messaging.util.ClassUtil;
import flex.messaging.util.XMLUtil;
/**
* A deserializer of AMF protocol data.
*
* @see ActionMessageOutput
*
*/
public abstract class AbstractAmfInput extends AmfIO implements ActionMessageInput
{
/**
* This is the initial capacity that will be used for AMF arrays, vectors, etc.
* that have length greater than 1024.
*/
public static final int INITIAL_COLLECTION_CAPACITY = 1024;
/**
* This is the default max String length (25MB).
*/
public static final int DEFAULT_MAX_STRING_BYTES = 26214400;
public static final String STRING_MAX_STRING_BYTES = "max-string-bytes";
protected BeanProxy beanProxy = new BeanProxy();
protected DataInputStream in = null;
protected int maxStringBytes = DEFAULT_MAX_STRING_BYTES;
/**
* Construct a deserializer without connecting it to an input stream.
* @param context serialization parameters.
*/
public AbstractAmfInput(SerializationContext context)
{
super(context);
readMaxStringBytes();
}
/**
* Internal use
*
*/
public void setInputStream(InputStream in)
{
this.in = new DataInputStream(in);
}
protected Object stringToDocument(String xml)
{
// FIXME: Temporary workaround for bug 194815
if (xml != null && xml.indexOf('<') == -1)
return xml;
// Validation performed in XMLUtil#stringToDocument.
return XMLUtil.stringToDocument(xml, !(context.legacyXMLNamespaces),
context.allowXmlExternalEntityExpansion);
}
/**
* A utility method that is used by subclasses to perform max-string-bytes
* checks. By default, max-string-bytes is limited to 25MB for security
* but this can be changed via JVM option called max-string-bytes.
*
* @param utflen The UTF string length to check.
* @throws SerializationException if max-string-bytes has been exceeded.
*/
protected void checkUTFLength(int utflen)
{
if (utflen > maxStringBytes)
{
// Error deserializing the string with length ''{0}'', it exceeds the max-string-bytes limit of ''{1}''.
SerializationException ex = new SerializationException();
ex.setMessage(10314, new Object[] {utflen, maxStringBytes});
throw ex;
}
}
/**
* Internal use. Common logic for creating an object for AMF0 and AMF3. Used from
* Amf0Input.readObjectValue() and Amf3Input.readScriptObject().
* This method is responsible for resolving class aliases, creating and
* registering a property proxy and instantiating an instance of the desired class.
* The params array is used as a holder for parameter values that are updated or
* created in this method, but are needed by its callers.
* @param params array of values that may be updated by this method.
* [0] - String className - the name or alias of the class to create
* [1] - PropertyProxy proxy
* @return an instance of the appropriate object for deserialization
*
*/
protected Object createObjectInstance(Object[] params)
{
String className = (String)params[0];
// Check for any registered class aliases
String aliasedClass = ClassAliasRegistry.getRegistry().getClassName(className);
if (aliasedClass != null)
{
className = aliasedClass;
params[0] = className; //update the params array so that callers get this change
}
Object object = null;
PropertyProxy proxy = null;
if (className != null && className.startsWith(">")) // Handle [RemoteClass] (no server alias)
{
object = createDefaultASObject(className);
}
else if (className != null && className.length() > 0 && (context.instantiateTypes || className.startsWith("flex.")))
{
// otherwise attempt to create an instance if we have a className
Class desiredClass = null;
try
{
desiredClass = AbstractProxy.getClassFromClassName(className);
}
catch (MessageException me)
{
// Type not found and don't want to use ASObject for the missing type.
if (!(me.getCode().startsWith(MessageException.CODE_SERVER_RESOURCE_UNAVAILABLE)
&& context.createASObjectForMissingType))
{
throw me; // Rethrow.
}
// if we didn't rethrow the exception, the default ASObject will be created further down.
}
// Type exists. Create either default instance of desiredClass or an instance from a registered proxy.
if (desiredClass != null)
{
proxy = PropertyProxyRegistry.getRegistry().getProxyAndRegister(desiredClass);
if (proxy == null)
{
object = ClassUtil.createDefaultInstance(desiredClass, null, true /*validate*/);
}
else
{
object = proxy.createInstance(className); // Validation is performed in the proxy.
}
}
}
// if we still don't have an object, create an ASObject with what we have for className (can be null)
if (object == null)
object = createDefaultASObject(className);
// if proxy wasn't created, create one based on the new instance.
if (proxy == null)
proxy = PropertyProxyRegistry.getProxyAndRegister(object);
params[1] = proxy; //update the params array so that callers get the proxy
return object;
}
/**
* Internal use. Convenience method for creating an ASObject and assigning it a type
* @param type named type for the ASObject or null
* @return a new instance of ASObject
*
*/
protected ASObject createDefaultASObject(String type)
{
ASObject object = (ASObject) ClassUtil.createDefaultInstance(ASObject.class, null, true /*validate*/);
if (type != null && type.length() > 0)
object.setType(type);
return object;
}
/**
*
*/
protected void readMaxStringBytes()
{
// See if a JVM option is specified for max-string-bytes.
String maxStringBytes = null;
try
{
maxStringBytes = System.getProperty(STRING_MAX_STRING_BYTES);
}
catch (SecurityException se)
{
// Ignore and use the default.
}
if (maxStringBytes == null)
return;
try
{
this.maxStringBytes = Integer.parseInt(maxStringBytes);
}
catch (NumberFormatException ignore)
{
// Ignore and use the default.
}
}
//
// java.io.ObjectInput IMPLEMENTATIONS
//
/** {@inheritDoc} */
public int available() throws IOException
{
return in.available();
}
/** {@inheritDoc} */
public void close() throws IOException
{
in.close();
}
/** {@inheritDoc} */
public int read() throws IOException
{
return in.read();
}
/** {@inheritDoc} */
public int read(byte[] bytes) throws IOException
{
return in.read(bytes);
}
/** {@inheritDoc} */
public int read(byte[] bytes, int offset, int length) throws IOException
{
return in.read(bytes, offset, length);
}
/** {@inheritDoc} */
public long skip(long n) throws IOException
{
return in.skip(n);
}
/** {@inheritDoc} */
public int skipBytes(int n) throws IOException
{
return in.skipBytes(n);
}
//
// java.io.DataInput IMPLEMENTATIONS
//
/** {@inheritDoc} */
public boolean readBoolean() throws IOException
{
return in.readBoolean();
}
/** {@inheritDoc} */
public byte readByte() throws IOException
{
return in.readByte();
}
/** {@inheritDoc} */
public char readChar() throws IOException
{
return in.readChar();
}
/** {@inheritDoc} */
public double readDouble() throws IOException
{
return in.readDouble();
}
/** {@inheritDoc} */
public float readFloat() throws IOException
{
return in.readFloat();
}
/** {@inheritDoc} */
public void readFully(byte[] bytes) throws IOException
{
in.readFully(bytes);
}
/** {@inheritDoc} */
public void readFully(byte[] bytes, int offset, int length) throws IOException
{
in.readFully(bytes, offset, length);
}
/** {@inheritDoc} */
public int readInt() throws IOException
{
return in.readInt();
}
/**
* Reads the next line of text from the input stream.
* @deprecated
*/
public String readLine() throws IOException
{
return in.readLine();
}
/** {@inheritDoc} */
public long readLong() throws IOException
{
return in.readLong();
}
/** {@inheritDoc} */
public short readShort() throws IOException
{
return in.readShort();
}
/** {@inheritDoc} */
public int readUnsignedByte() throws IOException
{
return in.readUnsignedByte();
}
/** {@inheritDoc} */
public int readUnsignedShort() throws IOException
{
return in.readUnsignedShort();
}
/** {@inheritDoc} */
public String readUTF() throws IOException
{
return in.readUTF();
}
}
