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 * 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
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 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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 * KIND, either express or implied.  See the License for the
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package org.apache.pdfbox.preflight.metadata;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertSame;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.IOException;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDDocumentInformation;
import org.apache.pdfbox.preflight.PreflightConstants;
import org.apache.pdfbox.preflight.ValidationResult.ValidationError;
import org.apache.pdfbox.preflight.exception.ValidationException;
import org.apache.xmpbox.XMPMetadata;
import org.apache.xmpbox.schema.AdobePDFSchema;
import org.apache.xmpbox.schema.DublinCoreSchema;
import org.apache.xmpbox.schema.XMPBasicSchema;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;


/**
 * Test Class of SynchronizedMetaDataValidation (for 6-7-3 Isartor Tests)
 * 
 * @author Germain Costenobel
 * 
 */
class TestSynchronizedMetadataValidation
{

    protected PDDocument doc;
    protected PDDocumentInformation dico;
    protected XMPMetadata metadata;
    protected String title, author, subject, keywords, creator, producer;
    protected Calendar creationDate, modifyDate;
    protected static SynchronizedMetaDataValidation sync;
    protected List<ValidationError> ve;

    @BeforeAll
    static void initSynchronizedMetadataValidation()
    {
        sync = new SynchronizedMetaDataValidation();
    }

    @BeforeEach
    void initNewDocumentInformation() throws Exception
    {
        doc = new PDDocument();
        dico = doc.getDocumentInformation();
        metadata = XMPMetadata.createXMPMetadata();
    }

    /**
     * Check detection of a null Document
     * 
     * @throws ValidationException
     */
    @Test
    void TestNullDocument() throws ValidationException
    {
        assertThrows(ValidationException.class, () -> {
            sync.validateMetadataSynchronization(null, metadata);
        });
    }

    /**
     * Check detection of null metadata
     * 
     * @throws ValidationException
     */
    @Test
    void TestNullMetaData() throws ValidationException
    {
        assertThrows(ValidationException.class, () -> {
            sync.validateMetadataSynchronization(doc, null);
        });
    }

    /**
     * Check the detection of a PDF document without any information
     * 
     * @throws Exception
     */
    @Test
    void TestDocumentWithoutInformation() throws Exception
    {
        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            // Test without any information
            assertEquals(0, ve.size());
        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }
    }

    /**
     * Check the detection of a completely empty XMP document (without any schemas)
     * 
     * @throws Exception
     */
    @Test
    void testEmptyXMP() throws Exception
    {
        initValues();

        // Writing info in Document Information dictionary
        // TITLE
        dico.setTitle(title);
        // AUTHOR
        dico.setAuthor(author);
        // SUBJECT
        dico.setSubject(subject);
        // KEYWORDS
        dico.setKeywords(keywords);
        // CREATOR
        dico.setCreator(creator);
        // PRODUCER
        dico.setProducer(producer);
        // CREATION DATE
        dico.setCreationDate(creationDate);
        // MODIFY DATE
        dico.setModificationDate(modifyDate);

        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            // Test Detection of an Empty XMP (without any schemas)
            for (ValidationError valid : ve)
            {
                assertEquals(PreflightConstants.ERROR_METADATA_MISMATCH, valid.getErrorCode());
            }
        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }
    }

    /**
     * Check the detection of a XMP with empty common schemas
     * 
     * @throws Exception
     */
    @Test
    void testEmptyXMPSchemas() throws Exception
    {
        initValues();

        // building temporary XMP metadata (but empty)
        metadata.createAndAddDublinCoreSchema();
        metadata.createAndAddAdobePDFSchema();
        metadata.createAndAddXMPBasicSchema();

        // Writing info in Document Information dictionary
        // TITLE
        dico.setTitle(title);
        // AUTHOR
        dico.setAuthor(author);
        // SUBJECT
        dico.setSubject(subject);
        // KEYWORDS
        dico.setKeywords(keywords);
        // CREATOR
        dico.setCreator(creator);
        // PRODUCER
        dico.setProducer(producer);
        // CREATION DATE
        dico.setCreationDate(creationDate);
        // MODIFY DATE
        dico.setModificationDate(modifyDate);

        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            // Test Detection of absent XMP values
            assertEquals(8, ve.size());
        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }

    }

    /**
     * Check detection of a null value in array (for Subject and author properties)
     * 
     * @throws Exception
     */
    @Test
    void testNullArrayValue() throws Exception
    {
        // building temporary XMP metadata

        DublinCoreSchema dc = metadata.createAndAddDublinCoreSchema();

        // AUTHOR
        dico.setAuthor("dicoAuthor");
        assertThrows(IllegalArgumentException.class, () -> {
            dc.addCreator(null);
        });
        
        // SUBJECT
        dico.setSubject("dicoSubj");
        assertThrows(IllegalArgumentException.class, () -> {
            dc.addSubject(null);
        });

        // Launching synchronization test
        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            // Test unsychronized value
            assertEquals(2, ve.size());

        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }
    }

    /**
     * in XMP, Subject and Author must be embedded in a single entry text array This function check the detection of
     * multiple entries for these properties
     * 
     * @throws Exception
     */
    @Test
    void testBadSizeOfArrays() throws Exception
    {
        // building temporary XMP metadata

        DublinCoreSchema dc = metadata.createAndAddDublinCoreSchema();
        AdobePDFSchema pdf = metadata.createAndAddAdobePDFSchema();
        XMPBasicSchema xmp = metadata.createAndAddXMPBasicSchema();

        // Writing info in XMP and Document Information dictionary
        // TITLE
        dico.setTitle("dicoTitle");
        dc.setTitle("x-default", "XMPTitle");
        // AUTHOR
        dico.setAuthor("dicoAuthor");
        dc.addCreator("XMPAuthor");
        dc.addCreator("2ndCreator");
        // SUBJECT
        dico.setSubject("dicoSubj");
        dc.addSubject("XMPSubj");
        dc.addSubject("2ndSubj");
        // KEYWORDS
        dico.setKeywords("DicoKeywords");
        pdf.setKeywords("XMPkeywords");
        // CREATOR
        dico.setCreator("DicoCreator");
        xmp.setCreatorTool("XMPCreator");
        // PRODUCER
        dico.setProducer("DicoProducer");
        pdf.setProducer("XMPProducer");
        // CREATION DATE
        dico.setCreationDate(Calendar.getInstance());
        GregorianCalendar XMPCreate = new GregorianCalendar(2008, 11, 05);
        xmp.setCreateDate(XMPCreate);
        // MODIFY DATE
        dico.setModificationDate(Calendar.getInstance());
        GregorianCalendar XMPModify = new GregorianCalendar(2009, 10, 15);
        xmp.setModifyDate(XMPModify);

        // Launching synchronization test
        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            // Test unsychronized value
            assertEquals(8, ve.size());
        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }

    }

    /**
     * Check the detection of unsynchronized information between Document Information dictionary and XMP
     * 
     * @throws Exception
     */
    @Test
    void testAllInfoUnsynchronized() throws Exception
    {
        // building temporary XMP metadata

        DublinCoreSchema dc = metadata.createAndAddDublinCoreSchema();
        AdobePDFSchema pdf = metadata.createAndAddAdobePDFSchema();
        XMPBasicSchema xmp = metadata.createAndAddXMPBasicSchema();

        // Writing info in XMP and Document Information dictionary
        // TITLE
        dico.setTitle("dicoTitle");
        dc.setTitle("x-default", "XMPTitle");
        // AUTHOR
        dico.setAuthor("dicoAuthor");
        dc.addCreator("XMPAuthor");
        // SUBJECT
        dico.setSubject("dicoSubj");
        dc.addSubject("XMPSubj");
        // KEYWORDS
        dico.setKeywords("DicoKeywords");
        pdf.setKeywords("XMPkeywords");
        // CREATOR
        dico.setCreator("DicoCreator");
        xmp.setCreatorTool("XMPCreator");
        // PRODUCER
        dico.setProducer("DicoProducer");
        pdf.setProducer("XMPProducer");
        // CREATION DATE
        dico.setCreationDate(Calendar.getInstance());
        GregorianCalendar XMPCreate = new GregorianCalendar(2008, 11, 05);
        xmp.setCreateDate(XMPCreate);
        // MODIFY DATE
        dico.setModificationDate(Calendar.getInstance());
        GregorianCalendar XMPModify = new GregorianCalendar(2009, 10, 15);
        xmp.setModifyDate(XMPModify);

        // Launching synchronization test
        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            // Test unsychronized value
            assertEquals(8, ve.size());
        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }

    }

    /**
     * Check reaction when metadata are well-formed
     * 
     * @throws Exception
     */
    @Test
    void testAllInfoSynchronized() throws Exception
    {
        initValues();

        // building temporary XMP metadata
        DublinCoreSchema dc = metadata.createAndAddDublinCoreSchema();
        XMPBasicSchema xmp = metadata.createAndAddXMPBasicSchema();
        AdobePDFSchema pdf = metadata.createAndAddAdobePDFSchema();
        // Writing info in XMP and Document Information dictionary
        // TITLE
        dico.setTitle(title);
        dc.setTitle("x-default", title);
        // AUTHOR
        dico.setAuthor(author);
        dc.addCreator(author);
        // SUBJECT
        dico.setSubject(subject);
        dc.addDescription("x-default", subject);
        // KEYWORDS
        dico.setKeywords(keywords);
        pdf.setKeywords(keywords);
        // CREATOR
        dico.setCreator(creator);
        xmp.setCreatorTool(creator);
        // PRODUCER
        dico.setProducer(producer);
        pdf.setProducer(producer);
        // CREATION DATE
        dico.setCreationDate(creationDate);
        xmp.setCreateDate(creationDate);
        // MODIFY DATE
        dico.setModificationDate(modifyDate);
        xmp.setModifyDate(modifyDate);

        // Launching synchronization test
        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            // Checking all is synchronized
            assertEquals(0, ve.size());
        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }

    }
    /**
     * Check if schemaAccessException Generator is ok
     * 
     * @throws Exception
     */
    @Test
    void checkSchemaAccessException() throws Exception
    {
        Throwable cause = new Throwable();
        assertSame(cause, sync.schemaAccessException("test", cause).getCause());
    }

    /**
     * Check reaction when metadata are well-formed
     * 
     * @throws Exception
     */
    @Test
    void testBadPrefixSchemas() throws Exception
    {
        initValues();

        // building temporary XMP metadata
        DublinCoreSchema dc = new DublinCoreSchema(metadata, "dctest");
        metadata.addSchema(dc);
        XMPBasicSchema xmp = new XMPBasicSchema(metadata, "xmptest");
        metadata.addSchema(xmp);
        AdobePDFSchema pdf = new AdobePDFSchema(metadata, "pdftest");
        metadata.addSchema(pdf);

        // Writing info in XMP and Document Information dictionary
        // TITLE
        dico.setTitle(title);
        dc.setTitle("x-default", title);
        // AUTHOR
        dico.setAuthor(author);
        dc.addCreator(author);
        // SUBJECT
        dico.setSubject(subject);
        dc.addDescription("x-default", subject);
        // KEYWORDS
        dico.setKeywords(keywords);
        pdf.setKeywords(keywords);
        // CREATOR
        dico.setCreator(creator);
        xmp.setCreatorTool(creator);
        // PRODUCER
        dico.setProducer(producer);
        pdf.setProducer(producer);
        // CREATION DATE
        dico.setCreationDate(creationDate);
        xmp.setCreateDate(creationDate);
        // MODIFY DATE
        dico.setModificationDate(modifyDate);
        xmp.setModifyDate(modifyDate);

        // Launching synchronization test
        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            for (ValidationError valid : ve)
            {
                assertEquals(PreflightConstants.ERROR_METADATA_WRONG_NS_PREFIX, valid.getErrorCode());
            }
        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }

    }

    /**
     * Check reaction when metadata are well-formed
     * 
     * @throws Exception
     */
    @Test
    void testdoublePrefixSchemas() throws Exception
    {
        initValues();

        // building temporary XMP metadata
        DublinCoreSchema dc = metadata.createAndAddDublinCoreSchema();
        DublinCoreSchema dc2 = new DublinCoreSchema(metadata, "dctest");
        metadata.addSchema(dc2);
        XMPBasicSchema xmp = metadata.createAndAddXMPBasicSchema();
        XMPBasicSchema xmp2 = new XMPBasicSchema(metadata, "xmptest");
        metadata.addSchema(xmp2);
        AdobePDFSchema pdf = metadata.createAndAddAdobePDFSchema();
        AdobePDFSchema pdf2 = new AdobePDFSchema(metadata, "pdftest");
        metadata.addSchema(pdf2);

        // write some temp info in 'false' schemas
        dc2.setCoverage("tmpcover");
        xmp2.setCreatorTool("tmpcreator");
        pdf2.setKeywords("tmpkeys");

        // Writing info in XMP and Document Information dictionary
        // TITLE
        dico.setTitle(title);
        dc.setTitle("x-default", title);
        // AUTHOR
        dico.setAuthor(author);
        dc.addCreator(author);
        // SUBJECT
        dico.setSubject(subject);
        dc.addDescription("x-default", subject);
        // KEYWORDS
        dico.setKeywords(keywords);
        pdf.setKeywords(keywords);
        // CREATOR
        dico.setCreator(creator);
        xmp.setCreatorTool(creator);
        // PRODUCER
        dico.setProducer(producer);
        pdf.setProducer(producer);
        // CREATION DATE
        dico.setCreationDate(creationDate);
        xmp.setCreateDate(creationDate);
        // MODIFY DATE
        dico.setModificationDate(modifyDate);
        xmp.setModifyDate(modifyDate);

        // Launching synchronization test
        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            assertTrue(ve.isEmpty());
        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }
    }

    /**
     * Tests that two date values, which are from different time zones but
     * really identical, are detected as such.
     *
     * @throws Exception
     */
    @Test
    void testPDFBox4292() throws Exception
    {
        initValues();

        Calendar cal1 = org.apache.pdfbox.util.DateConverter.toCalendar("20180817115837+02'00'");
        Calendar cal2 = org.apache.xmpbox.DateConverter.toCalendar("2018-08-17T09:58:37Z");

        XMPBasicSchema xmp = metadata.createAndAddXMPBasicSchema();

        dico.setCreationDate(cal1);
        xmp.setCreateDate(cal2);
        dico.setModificationDate(cal1);
        xmp.setModifyDate(cal2);

        // Launching synchronization test
        try
        {
            ve = sync.validateMetadataSynchronization(doc, metadata);
            // Test unsychronized value
            assertEquals(0, ve.size());
        }
        catch (ValidationException e)
        {
            throw new Exception(e.getMessage());
        }
    }

    @AfterEach
    public void checkErrors() throws Exception
    {
        try
        {
            doc.close();
        }
        catch (IOException e)
        {
            throw new Exception("Error while closing PDF Document");
        }
        /*
         * Iterator<ValidationError> it=ve.iterator(); while(it.hasNext()){ ValidationError tmp=it.next();
         * System.out.println("Error:"+ tmp.getDetails()+"\n code: "+tmp.getErrorCode()); }
         */
    }

    private void initValues()
    {
        title = "TITLE";
        author = "AUTHOR(S)";
        subject = "SUBJECTS";
        keywords = "KEYWORD(S)";
        creator = "CREATOR";
        producer = "PRODUCER";
        creationDate = Calendar.getInstance();
        modifyDate = Calendar.getInstance();

        // PDFBOX-4292: because xmp keeps the milliseconds before writing to XML,
        // but COS doesn't, tests would fail when calendar values are compared
        // so reset the milliseconds. 
        creationDate.set(Calendar.MILLISECOND, 0);
        modifyDate.set(Calendar.MILLISECOND, 0);
    }
}
