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 * 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   *
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 * 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    *
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 * under the License.                                           *
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package org.apache.james.mime4j.stream;

import java.io.ByteArrayInputStream;
import java.io.InputStream;

import org.apache.commons.io.IOUtils;

import junit.framework.TestCase;

public class StrictMimeTokenStreamTest extends TestCase {
    
    private static final String HEADER_ONLY = "From: foo@abr.com\r\nSubject: A subject\r\n";
    private static final String CORRECT_HEADERS = HEADER_ONLY + "\r\n";
    
    MimeTokenStream parser;
    
    @Override
    protected void setUp() throws Exception {
        super.setUp();
        MimeEntityConfig config = new MimeEntityConfig();
        config.setStrictParsing(true);
        parser = new MimeTokenStream(config);
    }

    @Override
    protected void tearDown() throws Exception {
        super.tearDown();
    }
    
    public void testUnexpectedEndOfHeaders() throws Exception {
        parser.parse(new ByteArrayInputStream(HEADER_ONLY.getBytes("US-ASCII")));
        
        checkNextIs(EntityState.T_START_HEADER);
        checkNextIs(EntityState.T_FIELD);
        try {
            parser.next();
            fail("Expected exception to be thrown");
        } catch (MimeParseEventException e) {
            assertEquals("Premature end of headers", Event.HEADERS_PREMATURE_END, e.getEvent());
        }
     }
    
    public void testCorrectEndOfHeaders() throws Exception {
        parser.parse(new ByteArrayInputStream(CORRECT_HEADERS.getBytes("US-ASCII")));
        
        checkNextIs(EntityState.T_START_HEADER);
        checkNextIs(EntityState.T_FIELD);
        checkNextIs(EntityState.T_FIELD);
        checkNextIs(EntityState.T_END_HEADER);
     }
    
    public void testMissingBoundary() throws Exception {
        String message = 
            "Content-Type: multipart/mixed;boundary=aaaa\r\n\r\n" +
            "--aaaa\r\n" +
            "Content-Type:text/plain; charset=US-ASCII\r\n\r\n" +
            "Oh my god! Boundary is missing!\r\n";
        parser.parse(new ByteArrayInputStream(message.getBytes("US-ASCII")));
        checkNextIs(EntityState.T_START_HEADER);
        checkNextIs(EntityState.T_FIELD);
        checkNextIs(EntityState.T_END_HEADER);
        checkNextIs(EntityState.T_START_MULTIPART);
        checkNextIs(EntityState.T_START_BODYPART);
        checkNextIs(EntityState.T_START_HEADER);
        checkNextIs(EntityState.T_FIELD);
        checkNextIs(EntityState.T_END_HEADER);
        checkNextIs(EntityState.T_BODY);
        InputStream out = parser.getInputStream();
        assertEquals("Oh my god! Boundary is missing!\r\n", IOUtils.toString(out, "US-ASCII"));
        checkNextIs(EntityState.T_END_BODYPART);
        try {
            parser.next();
            fail("MimeParseEventException should have been thrown");
        } catch (MimeParseEventException expected) {
        }
     }
    
    private void checkNextIs(EntityState expected) throws Exception {
        assertEquals(MimeTokenStream.stateToString(expected), MimeTokenStream.stateToString(parser.next()));        
    }
}