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GUAC-868: Add GuacamoleFilter interface. Implemented corresponding FilteredGuacamoleReader and test.

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This commit is contained in:
Michael Jumper
2014-09-27 23:33:59 -07:00
parent e838817bff
commit 28075b86c1
3 changed files with 245 additions and 0 deletions
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99
guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleReader.java Normal file
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/*
* Copyright (C) 2014 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.glyptodon.guacamole.protocol;
import org.glyptodon.guacamole.GuacamoleException;
import org.glyptodon.guacamole.io.GuacamoleReader;
/**
* GuacamoleReader which applies a given GuacamoleFilter to observe or alter all
* read instructions. Instructions may also be dropped or denied by the the
* filter.
*
* @author Michael Jumper
*/
public class FilteredGuacamoleReader implements GuacamoleReader {
/**
* The wrapped GuacamoleReader.
*/
private final GuacamoleReader reader;
/**
* The filter to apply when reading instructions.
*/
private final GuacamoleFilter filter;
/**
* Wraps the given GuacamoleReader, applying the given filter to all read
* instructions. Future reads will return only instructions which pass
* the filter.
*
* @param reader The GuacamoleReader to wrap.
* @param filter The filter which dictates which instructions are read, and
* how.
*/
public FilteredGuacamoleReader(GuacamoleReader reader, GuacamoleFilter filter) {
this.reader = reader;
this.filter = filter;
}
@Override
public boolean available() throws GuacamoleException {
return reader.available();
}
@Override
public char[] read() throws GuacamoleException {
GuacamoleInstruction filteredInstruction = readInstruction();
if (filteredInstruction == null)
return null;
return filteredInstruction.toString().toCharArray();
}
@Override
public GuacamoleInstruction readInstruction() throws GuacamoleException {
GuacamoleInstruction filteredInstruction;
// Read and filter instructions until no instructions are dropped
do {
// Read next instruction
GuacamoleInstruction unfilteredInstruction = reader.readInstruction();
if (unfilteredInstruction == null)
return null;
// Apply filter
filteredInstruction = filter.filter(unfilteredInstruction);
} while (filteredInstruction == null);
return filteredInstruction;
}
}

51
guacamole-common/src/main/java/org/glyptodon/guacamole/protocol/GuacamoleFilter.java Normal file
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/*
* Copyright (C) 2014 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.glyptodon.guacamole.protocol;
import org.glyptodon.guacamole.GuacamoleException;
/**
* Interface which provides for the filtering of individual instructions. Each
* filtered instruction may be allowed through untouched, modified, replaced,
* dropped, or explicitly denied.
*
* @author Michael Jumper
*/
public interface GuacamoleFilter {
/**
* Applies the filter to the given instruction, returning the original
* instruction, a modified version of the original, or null, depending
* on the implementation.
*
* @param instruction The instruction to filter.
* @return The original instruction, if the instruction is to be allowed,
* a modified version of the instruction, if the instruction is
* to be overridden, or null, if the instruction is to be dropped.
* @throws GuacamoleException If an error occurs filtering the instruction,
* or if the instruction must be explicitly
* denied.
*/
public GuacamoleInstruction filter(GuacamoleInstruction instruction) throws GuacamoleException;
}

95
guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleReaderTest.java Normal file
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/*
* Copyright (C) 2014 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.glyptodon.guacamole.protocol;
import java.io.StringReader;
import org.glyptodon.guacamole.GuacamoleException;
import org.glyptodon.guacamole.io.GuacamoleReader;
import org.glyptodon.guacamole.io.ReaderGuacamoleReader;
import static org.junit.Assert.*;
import org.junit.Test;
/**
* Test which validates filtering of Guacamole instructions with
* FilteredGuacamoleReader.
*
* @author Michael Jumper
*/
public class FilteredGuacamoleReaderTest {
/**
* Filter which allows through "yes" instructions but drops all others.
*/
private class TestFilter implements GuacamoleFilter {
@Override
public GuacamoleInstruction filter(GuacamoleInstruction instruction) throws GuacamoleException {
if (instruction.getOpcode().equals("yes"))
return instruction;
return null;
}
}
@Test
public void testFilter() throws Exception {
// Test string
final String test = "3.yes,1.A;2.no,1.B;3.yes,1.C;3.yes,1.D;4.nope,1.E;";
GuacamoleReader reader = new FilteredGuacamoleReader(new ReaderGuacamoleReader(new StringReader(test)),
new TestFilter());
GuacamoleInstruction instruction;
// Validate first instruction
instruction = reader.readInstruction();
assertNotNull(instruction);
assertEquals("yes", instruction.getOpcode());
assertEquals(1, instruction.getArgs().size());
assertEquals("A", instruction.getArgs().get(0));
// Validate second instruction
instruction = reader.readInstruction();
assertNotNull(instruction);
assertEquals("yes", instruction.getOpcode());
assertEquals(1, instruction.getArgs().size());
assertEquals("C", instruction.getArgs().get(0));
// Validate third instruction
instruction = reader.readInstruction();
assertNotNull(instruction);
assertEquals("yes", instruction.getOpcode());
assertEquals(1, instruction.getArgs().size());
assertEquals("D", instruction.getArgs().get(0));
// Should be done now
instruction = reader.readInstruction();
assertNull(instruction);
}
}