/**
* 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.hadoop.gateway.filter.rewrite.impl.form;
import org.apache.hadoop.gateway.filter.rewrite.api.UrlRewriteFilterContentDescriptor;
import org.apache.hadoop.gateway.filter.rewrite.i18n.UrlRewriteMessages;
import org.apache.hadoop.gateway.filter.rewrite.impl.UrlRewriteUtil;
import org.apache.hadoop.gateway.i18n.messages.MessagesFactory;
import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
public class FormFilterReader extends Reader {
private static final UrlRewriteMessages LOG = MessagesFactory.get( UrlRewriteMessages.class );
private int offset;
private StringWriter writer;
private StringBuffer buffer;
private Reader reader;
private FormReader parser;
private FormWriter generator;
private UrlRewriteFilterContentDescriptor config;
public FormFilterReader( Reader reader, UrlRewriteFilterContentDescriptor config ) throws IOException {
this.reader = reader;
this.config = config;
parser = new FormReader( reader );
writer = new StringWriter();
buffer = writer.getBuffer();
offset = 0;
generator = new FormWriter( writer );
}
@Override
public int read( char[] destBuffer, int destOffset, int destCount ) throws IOException {
int count = 0;
int available = buffer.length() - offset;
if( available == 0 ) {
FormPair pair = parser.getNextPair();
if( pair == null ) {
count = -1;
} else {
processPair();
available = buffer.length() - offset;
}
}
if( available > 0 ) {
count = Math.min( destCount, available );
buffer.getChars( offset, offset+count, destBuffer, destOffset );
offset += count;
if( offset == buffer.length() ) {
offset = 0;
buffer.setLength( 0 );
}
}
return count;
}
private void processPair() throws IOException {
FormPair pair = parser.getCurrentPair();
String name = pair.getName();
String value = pair.getValue();
String rule = UrlRewriteUtil.pickFirstRuleWithEqualsIgnoreCasePathMatch( config, name );
try {
value = filterValue( name, pair.getValue(), rule );
pair.setValue( value );
} catch( Exception e ) {
LOG.failedToFilterValue( pair.getValue(), rule, e );
// Write original value.
}
generator.writePair( pair );
}
protected String filterValue( String name, String value, String rule ) {
return value;
}
@Override
public void close() throws IOException {
writer.close();
reader.close();
}
}