com.github.davidcarboni.encryptedfileupload.EncryptedFileItemSerializeTest.java Source code

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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 com.github.davidcarboni.encryptedfileupload;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.*;

import static org.junit.Assert.*;

/**
 * Serialization Unit tests for
 *  {@link com.github.davidcarboni.encryptedfileupload.EncryptedFileItem}.
 *
 * Based on: {@code org.apache.commons.fileupload.DiskFileItemSerializeTest} 1568860 2014-02-16 23:35:02Z sebb $
 */
public class EncryptedFileItemSerializeTest {

    // Use a private repo to catch any files left over by tests
    private static final File REPO = new File(System.getProperty("java.io.tmpdir"), "encryptedfileitemrepo");

    @Before
    public void setUp() throws Exception {
        if (REPO.exists()) {
            FileUtils.deleteDirectory(REPO);
        }
        assertFalse("Must not exist", REPO.exists());
        REPO.mkdir();
    }

    @After
    public void tearDown() {
        for (File file : FileUtils.listFiles(REPO, null, true)) {
            System.out.println("Found leftover file " + file);
        }
        REPO.delete();
        assertFalse(REPO + " is not empty", REPO.exists());
    }

    /**
     * Content type for regular form items.
     */
    private static final String textContentType = "text/plain";

    /**
     * Very low threshold for testing memory versus disk options.
     */
    private static final int threshold = 16;

    /**
     * Helper method to test creation of a field when a repository is used.
     */
    public void testInMemoryObject(byte[] testFieldValueBytes, File repository) {
        FileItem item = createFileItem(testFieldValueBytes, repository);

        // Check state is as expected
        assertTrue("Initial: in memory", item.isInMemory());
        assertEquals("Initial: size", item.getSize(), testFieldValueBytes.length);
        compareBytes("Initial", item.get(), testFieldValueBytes);

        // Serialize & Deserialize
        FileItem newItem = (FileItem) serializeDeserialize(item);

        // Test deserialized content is as expected
        assertTrue("Check in memory", newItem.isInMemory());
        compareBytes("Check", testFieldValueBytes, newItem.get());

        // Compare FileItem's (except byte[])
        compareFileItems(item, newItem);
    }

    /**
     * Helper method to test creation of a field.
     */
    private void testInMemoryObject(byte[] testFieldValueBytes) {
        testInMemoryObject(testFieldValueBytes, REPO);
    }

    /**
     * Test creation of a field for which the amount of data falls below the
     * configured threshold.
     */
    @Test
    public void testBelowThreshold() throws Exception {
        // Create the FileItem
        byte[] testFieldValueBytes = createContentBytes(threshold - 1);
        testInMemoryObject(testFieldValueBytes);
    }

    /**
     * Test creation of a field for which the amount of data equals the
     * configured threshold.
     */
    @Test
    public void testThreshold() throws Exception {
        // Create the FileItem
        byte[] testFieldValueBytes = createContentBytes(threshold);
        testInMemoryObject(testFieldValueBytes);
    }

    /**
     * Test creation of a field for which the amount of data falls above the
     * configured threshold.
     */
    @Test
    public void testAboveThreshold() throws Exception {
        // Create the FileItem
        byte[] testFieldValueBytes = createContentBytes(threshold + 1);
        FileItem item = createFileItem(testFieldValueBytes);

        // Check state is as expected
        assertFalse("Initial: in memory", item.isInMemory());
        assertEquals("Initial: size", item.getSize(), testFieldValueBytes.length);
        compareBytes("Initial", item.get(), testFieldValueBytes);

        // Serialize & Deserialize
        FileItem newItem = (FileItem) serializeDeserialize(item);

        // Test deserialized content is as expected
        assertFalse("Check in memory", newItem.isInMemory());
        compareBytes("Check", testFieldValueBytes, newItem.get());

        // Compare FileItem's (except byte[])
        compareFileItems(item, newItem);

        item.delete();
        newItem.delete();
    }

    /**
     * Test serialization and deserialization when repository is not null.
     */
    @Test
    public void testValidRepository() throws Exception {
        // Create the FileItem
        byte[] testFieldValueBytes = createContentBytes(threshold);
        testInMemoryObject(testFieldValueBytes, REPO);
    }

    /**
     * Test deserialization fails when repository is not valid.
     */
    @Test(expected = IOException.class)
    public void testInvalidRepository() throws Exception {
        // Create the FileItem
        byte[] testFieldValueBytes = createContentBytes(threshold);
        File repository = new File(System.getProperty("java.io.tmpdir"), "file");
        FileItem item = createFileItem(testFieldValueBytes, repository);
        deserialize(serialize(item));
    }

    /**
     * Test deserialization fails when repository contains a null character.
     */
    @Test(expected = IOException.class)
    public void testInvalidRepositoryWithNullChar() throws Exception {
        // Create the FileItem
        byte[] testFieldValueBytes = createContentBytes(threshold);
        File repository = new File(System.getProperty("java.io.tmpdir"), "\0");
        FileItem item = createFileItem(testFieldValueBytes, repository);
        deserialize(serialize(item));
    }

    /**
     * Compare FileItem's (except the byte[] content)
     */
    private void compareFileItems(FileItem origItem, FileItem newItem) {
        assertTrue("Compare: is in Memory", origItem.isInMemory() == newItem.isInMemory());
        assertTrue("Compare: is Form Field", origItem.isFormField() == newItem.isFormField());
        assertEquals("Compare: Field Name", origItem.getFieldName(), newItem.getFieldName());
        assertEquals("Compare: Content Type", origItem.getContentType(), newItem.getContentType());
        assertEquals("Compare: File Name", origItem.getName(), newItem.getName());
    }

    /**
     * Compare content bytes.
     */
    private void compareBytes(String text, byte[] origBytes, byte[] newBytes) {
        assertNotNull("origBytes must not be null", origBytes);
        assertNotNull("newBytes must not be null", newBytes);
        assertEquals(text + " byte[] length", origBytes.length, newBytes.length);
        for (int i = 0; i < origBytes.length; i++) {
            assertEquals(text + " byte[" + i + "]", origBytes[i], newBytes[i]);
        }
    }

    /**
     * Create content bytes of a specified size.
     */
    private byte[] createContentBytes(int size) {
        StringBuilder buffer = new StringBuilder(size);
        byte count = 0;
        for (int i = 0; i < size; i++) {
            buffer.append(count + "");
            count++;
            if (count > 9) {
                count = 0;
            }
        }
        return buffer.toString().getBytes();
    }

    /**
     * Create a FileItem with the specfied content bytes and repository.
     */
    private FileItem createFileItem(byte[] contentBytes, File repository) {
        FileItemFactory factory = new EncryptedFileItemFactory(threshold, repository);
        String textFieldName = "textField";

        FileItem item = factory.createItem(textFieldName, textContentType, true, "My File Name");
        try {
            OutputStream os = item.getOutputStream();
            os.write(contentBytes);
            os.close();
        } catch (IOException e) {
            fail("Unexpected IOException" + e);
        }

        return item;

    }

    /**
     * Create a FileItem with the specfied content bytes.
     */
    private FileItem createFileItem(byte[] contentBytes) {
        return createFileItem(contentBytes, REPO);
    }

    /**
     * Do serialization
     */
    private ByteArrayOutputStream serialize(Object target) throws Exception {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(target);
        oos.flush();
        oos.close();
        return baos;
    }

    /**
     * Do deserialization
     */
    private Object deserialize(ByteArrayOutputStream baos) throws Exception {
        Object result = null;
        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bais);
        result = ois.readObject();
        bais.close();

        return result;
    }

    /**
     * Do serialization and deserialization.
     */
    private Object serializeDeserialize(Object target) {
        // Serialize the test object
        ByteArrayOutputStream baos = null;
        try {
            baos = serialize(target);
        } catch (Exception e) {
            fail("Exception during serialization: " + e);
        }

        // Deserialize the test object
        Object result = null;
        try {
            result = deserialize(baos);
        } catch (Exception e) {
            fail("Exception during deserialization: " + e);
        }
        IOUtils.closeQuietly(baos);
        return result;
    }

}