KeywordSearchIngestModule.java

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/*
 * Autopsy Forensic Browser
 *
 * Copyright 2011-2023 Basis Technology Corp.
 * Contact: carrier <at> sleuthkit <dot> org
 *
 * Licensed 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.sleuthkit.autopsy.keywordsearch;
 
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.io.CharSource;
import java.io.IOException;
import java.io.Reader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import static java.util.Locale.US;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.commons.lang3.tuple.Triple;
import org.apache.tika.metadata.DublinCore;
import org.apache.tika.metadata.FileSystem;
import org.apache.tika.metadata.IPTC;
import org.apache.tika.metadata.Office;
import org.apache.tika.metadata.OfficeOpenXMLCore;
import org.apache.tika.metadata.OfficeOpenXMLExtended;
import org.apache.tika.metadata.PDF;
import org.apache.tika.metadata.Photoshop;
import org.apache.tika.metadata.TikaCoreProperties;
import org.apache.tika.metadata.XMP;
import org.apache.tika.metadata.XMPDM;
import org.apache.tika.mime.MimeTypes;
import org.openide.util.Lookup;
import org.openide.util.NbBundle;
import org.openide.util.NbBundle.Messages;
import org.openide.util.lookup.Lookups;
import org.sleuthkit.autopsy.casemodule.Case;
import org.sleuthkit.autopsy.casemodule.NoCurrentCaseException;
import org.sleuthkit.autopsy.coreutils.ExecUtil.ProcessTerminator;
import org.sleuthkit.autopsy.coreutils.Logger;
import org.sleuthkit.autopsy.coreutils.MessageNotifyUtil;
import org.sleuthkit.autopsy.ingest.FileIngestModule;
import org.sleuthkit.autopsy.ingest.IngestJobContext;
import org.sleuthkit.autopsy.ingest.IngestMessage;
import org.sleuthkit.autopsy.ingest.IngestMessage.MessageType;
import org.sleuthkit.autopsy.ingest.IngestModuleReferenceCounter;
import org.sleuthkit.autopsy.ingest.IngestServices;
import org.sleuthkit.autopsy.keywordsearch.Ingester.IngesterException;
import org.sleuthkit.autopsy.keywordsearchservice.KeywordSearchService;
import org.sleuthkit.autopsy.keywordsearchservice.KeywordSearchServiceException;
import org.sleuthkit.autopsy.modules.filetypeid.FileTypeDetector;
import org.sleuthkit.autopsy.textextractors.TextExtractor;
import org.sleuthkit.autopsy.textextractors.TextExtractorFactory;
import org.sleuthkit.autopsy.textextractors.TextFileExtractor;
import org.sleuthkit.autopsy.textextractors.configs.ImageConfig;
import org.sleuthkit.autopsy.textextractors.configs.StringsConfig;
import org.sleuthkit.datamodel.AbstractFile;
import org.sleuthkit.datamodel.Blackboard;
import org.sleuthkit.datamodel.BlackboardArtifact;
import org.sleuthkit.datamodel.BlackboardAttribute;
import org.sleuthkit.datamodel.TskCoreException;
import org.sleuthkit.datamodel.TskData;
import org.sleuthkit.datamodel.TskData.FileKnown;
import org.sleuthkit.datamodel.TskException;

@NbBundle.Messages({
    "# {0} - Reason for not starting Solr", "KeywordSearchIngestModule.init.tryStopSolrMsg={0}<br />Please try stopping Java Solr processes if any exist and restart the application.",
    "KeywordSearchIngestModule.init.badInitMsg=Keyword search server was not properly initialized, cannot run keyword search ingest.",
    "SolrConnectionCheck.Port=Invalid port number.",
    "# {0} - Reason for not connecting to Solr", "KeywordSearchIngestModule.init.exception.errConnToSolr.msg=Error connecting to SOLR server: {0}.",
    "KeywordSearchIngestModule.startUp.noOpenCore.msg=The index could not be opened or does not exist.",
    "CannotRunFileTypeDetection=Unable to run file type detection."
})
public final class KeywordSearchIngestModule implements FileIngestModule {
 
    private static final int LIMITED_OCR_SIZE_MIN = 100 * 1024;

    static final List<String> ARCHIVE_MIME_TYPES
            = ImmutableList.of(
                    //ignore unstructured binary and compressed data, for which string extraction or unzipper works better
                    "application/x-7z-compressed", //NON-NLS
                    "application/x-ace-compressed", //NON-NLS
                    "application/x-alz-compressed", //NON-NLS
                    "application/x-arj", //NON-NLS
                    "application/vnd.ms-cab-compressed", //NON-NLS
                    "application/x-cfs-compressed", //NON-NLS
                    "application/x-dgc-compressed", //NON-NLS
                    "application/x-apple-diskimage", //NON-NLS
                    "application/x-gca-compressed", //NON-NLS
                    "application/x-dar", //NON-NLS
                    "application/x-lzx", //NON-NLS
                    "application/x-lzh", //NON-NLS
                    "application/x-rar-compressed", //NON-NLS
                    "application/x-stuffit", //NON-NLS
                    "application/x-stuffitx", //NON-NLS
                    "application/x-gtar", //NON-NLS
                    "application/x-archive", //NON-NLS
                    "application/x-executable", //NON-NLS
                    "application/x-gzip", //NON-NLS
                    "application/zip", //NON-NLS
                    "application/x-zoo", //NON-NLS
                    "application/x-cpio", //NON-NLS
                    "application/x-shar", //NON-NLS
                    "application/x-tar", //NON-NLS
                    "application/x-bzip", //NON-NLS
                    "application/x-bzip2", //NON-NLS
                    "application/x-lzip", //NON-NLS
                    "application/x-lzma", //NON-NLS
                    "application/x-lzop", //NON-NLS
                    "application/x-z", //NON-NLS
                    "application/x-compress"); //NON-NLS

    private static final Map<String, Pair<BlackboardAttribute.ATTRIBUTE_TYPE, Integer>> METADATA_TYPES_MAP = Stream.of(
            Pair.of(BlackboardAttribute.ATTRIBUTE_TYPE.TSK_DATETIME_MODIFIED, List.of(
                    "Last-Save-Date",
                    TikaCoreProperties.MODIFIED.getName(),
                    FileSystem.MODIFIED.getName(),
                    DublinCore.MODIFIED.getName(),
                    PDF.DOC_INFO_MODIFICATION_DATE.getName(),
                    PDF.PDFVT_MODIFIED.getName(),
                    XMP.MODIFY_DATE.getName(),
                    XMPDM.AUDIO_MOD_DATE.getName(),
                    XMPDM.METADATA_MOD_DATE.getName(),
                    XMPDM.VIDEO_MOD_DATE.getName())),
            Pair.of(BlackboardAttribute.ATTRIBUTE_TYPE.TSK_USER_ID, List.of(
                    "Last-Author",
                    Office.LAST_AUTHOR.getName(),
                    TikaCoreProperties.MODIFIER.getName())),
            Pair.of(BlackboardAttribute.ATTRIBUTE_TYPE.TSK_DATETIME_CREATED, List.of(
                    "Creation-Date",
                    TikaCoreProperties.CREATED.getName(),
                    FileSystem.CREATED.getName(),
                    DublinCore.CREATED.getName(),
                    IPTC.DATE_CREATED.getName(),
                    Office.CREATION_DATE.getName(),
                    PDF.DOC_INFO_CREATED.getName(),
                    Photoshop.DATE_CREATED.getName(),
                    XMP.CREATE_DATE.getName())),
            Pair.of(BlackboardAttribute.ATTRIBUTE_TYPE.TSK_ORGANIZATION, List.of(
                    "Company",
                    DublinCore.PUBLISHER.getName(),
                    IPTC.ORGANISATION_NAME.getName(),
                    OfficeOpenXMLExtended.COMPANY.getName())),
            Pair.of(BlackboardAttribute.ATTRIBUTE_TYPE.TSK_OWNER, List.of(
                    "Author",
                    TikaCoreProperties.CREATOR.getName(),
                    DublinCore.CREATOR.getName(),
                    Office.INITIAL_AUTHOR.getName(),
                    Office.AUTHOR.getName(),
                    Photoshop.AUTHORS_POSITION.getName(),
                    PDF.DOC_INFO_CREATOR.getName())),
            Pair.of(BlackboardAttribute.ATTRIBUTE_TYPE.TSK_PROG_NAME, List.of(
                    "Application-Name",
                    "Producer",
                    OfficeOpenXMLExtended.APPLICATION.getName(),
                    org.apache.tika.metadata.RTFMetadata.EMB_APP_VERSION.getName())),
            Pair.of(BlackboardAttribute.ATTRIBUTE_TYPE.TSK_LAST_PRINTED_DATETIME, List.of(
                    "Last-Printed",
                    OfficeOpenXMLCore.LAST_PRINTED.getName())),
            Pair.of(BlackboardAttribute.ATTRIBUTE_TYPE.TSK_DESCRIPTION, List.of(
                    "Title",
                    DublinCore.TITLE.getName(),
                    IPTC.TITLE.getName(),
                    PDF.DOC_INFO_TITLE.getName())),
            Pair.of(BlackboardAttribute.ATTRIBUTE_TYPE.TSK_VERSION, List.of(
                    PDF.PDF_VERSION.getName(),
                    OfficeOpenXMLCore.VERSION.getName())))
            .flatMap(pr -> {
                BlackboardAttribute.ATTRIBUTE_TYPE attrType = pr.getKey();
                List<String> keys = pr.getValue();
                return IntStream.range(0, keys.size())
                        .mapToObj(idx -> Triple.of(keys.get(idx), attrType, idx));
            })
            .collect(Collectors.toMap(Triple::getLeft, trip -> Pair.of(trip.getMiddle(), trip.getRight()), (v1, v2) -> v1.getRight() < v2.getRight() ? v1 : v2));
    
 
    private static final String IMAGE_MIME_TYPE_PREFIX = "image/";
 
    // documents where OCR is performed
    private static final ImmutableSet<String> OCR_DOCUMENTS = ImmutableSet.of(
            "application/pdf",
            "application/msword",
            "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            "application/vnd.ms-powerpoint",
            "application/vnd.openxmlformats-officedocument.presentationml.presentation",
            "application/vnd.ms-excel",
            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
    );

    enum StringsExtractOptions {
        EXTRACT_UTF16, 
        EXTRACT_UTF8, 
    };
 
    private static final Logger logger = Logger.getLogger(KeywordSearchIngestModule.class.getName());
    private final IngestServices services = IngestServices.getInstance();
    private Ingester ingester = null;
    private FileTypeDetector fileTypeDetector;
//only search images from current ingest, not images previously ingested/indexed
    //accessed read-only by searcher thread
 
    private Lookup stringsExtractionContext;
    private final KeywordSearchJobSettings settings;
    private boolean initialized = false;
    private long jobId;
    private static final AtomicInteger instanceCount = new AtomicInteger(0); //just used for logging
    private int instanceNum = 0;
    private static final IngestModuleReferenceCounter refCounter = new IngestModuleReferenceCounter();
    private IngestJobContext context;
 
    private enum IngestStatus {
 
        TEXT_INGESTED, 
        STRINGS_INGESTED, 
        METADATA_INGESTED, 
        SKIPPED_ERROR_INDEXING, 
        SKIPPED_ERROR_TEXTEXTRACT, 
        SKIPPED_ERROR_IO    
    };
    private static final Map<Long, Map<Long, IngestStatus>> ingestStatus = new HashMap<>(); //guarded by itself

    private static void putIngestStatus(long ingestJobId, long fileId, IngestStatus status) {
        synchronized (ingestStatus) {
            Map<Long, IngestStatus> ingestStatusForJob = ingestStatus.get(ingestJobId);
            if (ingestStatusForJob == null) {
                ingestStatusForJob = new HashMap<>();
                ingestStatus.put(ingestJobId, ingestStatusForJob);
            }
            ingestStatusForJob.put(fileId, status);
            ingestStatus.put(ingestJobId, ingestStatusForJob);
        }
    }
 
    KeywordSearchIngestModule(KeywordSearchJobSettings settings) {
        this.settings = settings;
        instanceNum = instanceCount.getAndIncrement();
    }

    @Messages({
        "KeywordSearchIngestModule.startupMessage.failedToGetIndexSchema=Failed to get schema version for text index.",
        "# {0} - Solr version number", "KeywordSearchIngestModule.startupException.indexSolrVersionNotSupported=Adding text no longer supported for Solr version {0} of the text index.",
        "# {0} - schema version number", "KeywordSearchIngestModule.startupException.indexSchemaNotSupported=Adding text no longer supported for schema version {0} of the text index.",
        "KeywordSearchIngestModule.noOpenCase.errMsg=No open case available."
    })
    @Override
    public void startUp(IngestJobContext context) throws IngestModuleException {
        initialized = false;
        jobId = context.getJobId();
 
        Server server = null;
        if (settings.isIndexToSolrEnabled()) {
            server = KeywordSearch.getServer();
            if (server.coreIsOpen() == false) {
                throw new IngestModuleException(Bundle.KeywordSearchIngestModule_startUp_noOpenCore_msg());
            }
 
            try {
                Index indexInfo = server.getIndexInfo();
                if (!indexInfo.isCompatible(IndexFinder.getCurrentSchemaVersion())) {
                    throw new IngestModuleException(Bundle.KeywordSearchIngestModule_startupException_indexSchemaNotSupported(indexInfo.getSchemaVersion()));
                }
            } catch (NoOpenCoreException ex) {
                throw new IngestModuleException(Bundle.KeywordSearchIngestModule_startupMessage_failedToGetIndexSchema(), ex);
            }
        }
 
        try {
            fileTypeDetector = new FileTypeDetector();
        } catch (FileTypeDetector.FileTypeDetectorInitException ex) {
            throw new IngestModuleException(Bundle.CannotRunFileTypeDetection(), ex);
        }
 
        ingester = Ingester.getDefault();
        this.context = context;
 
        // increment the module reference count
        // if first instance of this module for this job then check the server and existence of keywords
        Case openCase;
        try {
            openCase = Case.getCurrentCaseThrows();
        } catch (NoCurrentCaseException ex) {
            throw new IngestModuleException(Bundle.KeywordSearchIngestModule_noOpenCase_errMsg(), ex);
        }
        if (refCounter.incrementAndGet(jobId) == 1) {
            if (openCase.getCaseType() == Case.CaseType.MULTI_USER_CASE) {
                // for multi-user cases need to verify connection to remore SOLR server
                KeywordSearchService kwsService = new SolrSearchService();
                Server.IndexingServerProperties properties = Server.getMultiUserServerProperties(openCase.getCaseDirectory());
                int port;
                try {
                    port = Integer.parseInt(properties.getPort());
                } catch (NumberFormatException ex) {
                    // if there is an error parsing the port number
                    throw new IngestModuleException(Bundle.KeywordSearchIngestModule_init_badInitMsg() + " " + Bundle.SolrConnectionCheck_Port(), ex);
                }
                try {
                    kwsService.tryConnect(properties.getHost(), port);
                } catch (KeywordSearchServiceException ex) {
                    throw new IngestModuleException(Bundle.KeywordSearchIngestModule_init_badInitMsg(), ex);
                }
            } else {
                // for single-user cases need to verify connection to local SOLR service
                // server will be null if indexing is disabled
                if (server != null) {
                    try {
                        if (!server.isLocalSolrRunning()) {
                            throw new IngestModuleException(Bundle.KeywordSearchIngestModule_init_tryStopSolrMsg(Bundle.KeywordSearchIngestModule_init_badInitMsg()));
                        }
                    } catch (KeywordSearchModuleException ex) {
                        //this means Solr is not properly initialized
                        throw new IngestModuleException(Bundle.KeywordSearchIngestModule_init_tryStopSolrMsg(Bundle.KeywordSearchIngestModule_init_badInitMsg()), ex);
                    }
                    try {
                        // make an actual query to verify that server is responding
                        // we had cases where getStatus was OK, but the connection resulted in a 404
                        server.queryNumIndexedDocuments();
                    } catch (KeywordSearchModuleException | NoOpenCoreException ex) {
                        throw new IngestModuleException(Bundle.KeywordSearchIngestModule_init_exception_errConnToSolr_msg(ex.getMessage()), ex);
                    }
                }
                // check if this job has any searchable keywords    
                List<KeywordList> keywordLists = XmlKeywordSearchList.getCurrent().getListsL();
                boolean hasKeywordsForSearch = false;
                for (KeywordList keywordList : keywordLists) {
                    if (settings.keywordListIsEnabled(keywordList.getName()) && !keywordList.getKeywords().isEmpty()) {
                        hasKeywordsForSearch = true;
                        break;
                    }
                }
                
                if (!settings.isIndexToSolrEnabled()) {
                    services.postMessage(IngestMessage.createWarningMessage(KeywordSearchModuleFactory.getModuleName(), NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.init.SolrIndexingDisabled"),
                            NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.init.indexingDisabled")));
                } else {
                    if (!hasKeywordsForSearch) {
                        services.postMessage(IngestMessage.createWarningMessage(KeywordSearchModuleFactory.getModuleName(), NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.init.noKwInLstMsg"),
                                NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.init.onlyIdxKwSkipMsg")));
                    }
                }
            }
        }
 
        StringsConfig stringsConfig = new StringsConfig();
        Map<String, String> stringsOptions = KeywordSearchSettings.getStringExtractOptions();
        stringsConfig.setExtractUTF8(Boolean.parseBoolean(stringsOptions.get(StringsExtractOptions.EXTRACT_UTF8.toString())));
        stringsConfig.setExtractUTF16(Boolean.parseBoolean(stringsOptions.get(StringsExtractOptions.EXTRACT_UTF16.toString())));
        stringsConfig.setLanguageScripts(KeywordSearchSettings.getStringExtractScripts());
 
        stringsExtractionContext = Lookups.fixed(stringsConfig);
 
        initialized = true;
    }
 
    @Override
    public ProcessResult process(AbstractFile abstractFile) {
        if (initialized == false) //error initializing indexing/Solr
        {
            logger.log(Level.SEVERE, "Skipping processing, module not initialized, file: {0}", abstractFile.getName());  //NON-NLS
            putIngestStatus(jobId, abstractFile.getId(), IngestStatus.SKIPPED_ERROR_INDEXING);
            return ProcessResult.OK;
        }
 
        if (abstractFile.getType().equals(TskData.TSK_DB_FILES_TYPE_ENUM.VIRTUAL_DIR)) {
            //skip indexing of virtual dirs (no content, no real name) - will index children files
            return ProcessResult.OK;
        }
 
        // if ocr only is enabled and not an ocr file, return
        Optional<TextExtractor> extractorOpt = getExtractor(abstractFile);
 
        String mimeType = fileTypeDetector.getMIMEType(abstractFile).trim().toLowerCase();
 
        if (settings.isOCREnabled()) {
            // if ocr only and the extractor is not present or will not perform ocr on this file, continue
            if (settings.isOCROnly() && (!extractorOpt.isPresent() || !extractorOpt.get().willUseOCR())) {
                return ProcessResult.OK;
            }
 
            // if limited ocr is enabled, the extractor will use ocr, and 
            // the file would not be subject to limited ocr reading, continue
            if (settings.isLimitedOCREnabled() && extractorOpt.isPresent()
                    && extractorOpt.get().willUseOCR() && !isLimitedOCRFile(abstractFile, mimeType)) {
                return ProcessResult.OK;
            }
        }
 
        if (KeywordSearchSettings.getSkipKnown() && abstractFile.getKnown().equals(FileKnown.KNOWN)) {
            //index meta-data only
            if (context.fileIngestIsCancelled()) {
                return ProcessResult.OK;
            }
            searchFile(extractorOpt, abstractFile, mimeType, false);
            return ProcessResult.OK;
        }
 
        //index the file and content (if the content is supported)
        if (context.fileIngestIsCancelled()) {
            return ProcessResult.OK;
        }
        searchFile(extractorOpt, abstractFile, mimeType, true);
 
        return ProcessResult.OK;
    }

    @Override
    public void shutDown() {
        logger.log(Level.INFO, "Keyword search ingest module instance {0} shutting down", instanceNum); //NON-NLS
 
        if ((initialized == false) || (context == null)) {
            return;
        }
 
        if (context.fileIngestIsCancelled()) {
            logger.log(Level.INFO, "Keyword search ingest module instance {0} stopping due to ingest cancellation", instanceNum); //NON-NLS
            cleanup();
            return;
        }
 
        // We only need to post the summary msg from the last module per job
        if (refCounter.decrementAndGet(jobId) == 0) {
 
            try {
                InlineSearcher.makeArtifacts(context);
                InlineSearcher.cleanup(context);
                Ingester.getDefault().commit();
            } catch (TskException ex) {
                logger.log(Level.SEVERE, String.format("Failed to create search ingest artifacts for job %d", context.getJobId()), ex);
            }
 
            try {
                final int numIndexedFiles = KeywordSearch.getServer().queryNumIndexedFiles();
                logger.log(Level.INFO, "Indexed files count: {0}", numIndexedFiles); //NON-NLS
                final int numIndexedChunks = KeywordSearch.getServer().queryNumIndexedChunks();
                logger.log(Level.INFO, "Indexed file chunks count: {0}", numIndexedChunks); //NON-NLS
            } catch (NoOpenCoreException | KeywordSearchModuleException ex) {
                logger.log(Level.SEVERE, "Error executing Solr queries to check number of indexed files and file chunks", ex); //NON-NLS
            }
            postIndexSummary();
            synchronized (ingestStatus) {
                ingestStatus.remove(jobId);
            }
        }
 
        cleanup();
    }

    private void cleanup() {
        stringsExtractionContext = null;
        initialized = false;
    }

    private boolean isLimitedOCRFile(AbstractFile aFile, String mimeType) {
        if (OCR_DOCUMENTS.contains(mimeType)) {
            return true;
        }
 
        if (mimeType.startsWith(IMAGE_MIME_TYPE_PREFIX)) {
            return aFile.getSize() > LIMITED_OCR_SIZE_MIN
                    || aFile.getType() == TskData.TSK_DB_FILES_TYPE_ENUM.DERIVED;
        }
 
        return false;
    }

    private void postIndexSummary() {
        int text_ingested = 0;
        int metadata_ingested = 0;
        int strings_ingested = 0;
        int error_text = 0;
        int error_index = 0;
        int error_io = 0;
 
        synchronized (ingestStatus) {
            Map<Long, IngestStatus> ingestStatusForJob = ingestStatus.get(jobId);
            if (ingestStatusForJob == null) {
                return;
            }
            for (IngestStatus s : ingestStatusForJob.values()) {
                switch (s) {
                    case TEXT_INGESTED:
                        text_ingested++;
                        break;
                    case METADATA_INGESTED:
                        metadata_ingested++;
                        break;
                    case STRINGS_INGESTED:
                        strings_ingested++;
                        break;
                    case SKIPPED_ERROR_TEXTEXTRACT:
                        error_text++;
                        break;
                    case SKIPPED_ERROR_INDEXING:
                        error_index++;
                        break;
                    case SKIPPED_ERROR_IO:
                        error_io++;
                        break;
                    default:
                       ;
                }
            }
        }
 
        StringBuilder msg = new StringBuilder();
        msg.append("<table border=0><tr><td>").append(NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.knowFileHeaderLbl")).append("</td><td>").append(text_ingested).append("</td></tr>"); //NON-NLS
        msg.append("<tr><td>").append(NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.fileGenStringsHead")).append("</td><td>").append(strings_ingested).append("</td></tr>"); //NON-NLS
        msg.append("<tr><td>").append(NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.mdOnlyLbl")).append("</td><td>").append(metadata_ingested).append("</td></tr>"); //NON-NLS
        msg.append("<tr><td>").append(NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.idxErrLbl")).append("</td><td>").append(error_index).append("</td></tr>"); //NON-NLS
        msg.append("<tr><td>").append(NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.errTxtLbl")).append("</td><td>").append(error_text).append("</td></tr>"); //NON-NLS
        msg.append("<tr><td>").append(NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.errIoLbl")).append("</td><td>").append(error_io).append("</td></tr>"); //NON-NLS
        msg.append("</table>"); //NON-NLS
        String indexStats = msg.toString();
        logger.log(Level.INFO, "Keyword Indexing Completed: {0}", indexStats); //NON-NLS
        services.postMessage(IngestMessage.createMessage(MessageType.INFO, KeywordSearchModuleFactory.getModuleName(), NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.kwIdxResultsLbl"), indexStats));
        if (error_index > 0) {
            MessageNotifyUtil.Notify.error(NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.kwIdxErrsTitle"),
                    NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.kwIdxErrMsgFiles", error_index));
        } else if (error_io + error_text > 0) {
            MessageNotifyUtil.Notify.warn(NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.kwIdxWarnMsgTitle"),
                    NbBundle.getMessage(this.getClass(), "KeywordSearchIngestModule.postIndexSummary.idxErrReadFilesMsg"));
        }
    }
 
    private Optional<TextExtractor> getExtractor(AbstractFile abstractFile) {
        ImageConfig imageConfig = new ImageConfig();
        imageConfig.setOCREnabled(settings.isOCREnabled());
        ProcessTerminator terminator = () -> context.fileIngestIsCancelled();
        Lookup extractionContext = Lookups.fixed(imageConfig, terminator);
        try {
            return Optional.ofNullable(TextExtractorFactory.getExtractor(abstractFile, extractionContext));
        } catch (TextExtractorFactory.NoTextExtractorFound ex) {
            return Optional.empty();
        }
    }

    private boolean extractTextAndSearch(Optional<TextExtractor> extractorOptional, AbstractFile aFile,
                Map<String, String> extractedMetadata) throws IngesterException {
 
        try {
            if (!extractorOptional.isPresent()) {
                return false;
            }
            //divide into chunks and index
            Ingester.getDefault().search(getTikaOrTextExtractor(extractorOptional, aFile, extractedMetadata), aFile.getId(), aFile.getName(), aFile, context, true,settings.isIndexToSolrEnabled(), settings.getNamesOfEnabledKeyWordLists());
            
        } catch (TextExtractor.InitReaderException  ex) {
            return false;
        } catch(Exception ex) {
            logger.log(Level.WARNING, String.format("Failed to search file %s [id=%d]",
                            aFile.getName(), aFile.getId()), ex);
            return false;
        }
        
        return true;
    }
    
    private Reader getTikaOrTextExtractor(Optional<TextExtractor> extractorOptional, AbstractFile aFile,
                Map<String, String> extractedMetadata) throws TextExtractor.InitReaderException {
            
            TextExtractor extractor = extractorOptional.get();
            Reader fileText = extractor.getReader();
            Reader finalReader;
            try {
                Map<String, String> metadata = extractor.getMetadata();
                if (!metadata.isEmpty()) {
                    // Creating the metadata artifact here causes occasional problems
                    // when indexing the text, so we save the metadata map to 
                    // use after this method is complete.
                    extractedMetadata.putAll(metadata);
                }
                CharSource formattedMetadata = getMetaDataCharSource(metadata);
                //Append the metadata to end of the file text
                finalReader = CharSource.concat(new CharSource() {
                    //Wrap fileText reader for concatenation
                    @Override
                    public Reader openStream() throws IOException {
                        return fileText;
                    }
                }, formattedMetadata).openStream();
            } catch (IOException ex) {
                logger.log(Level.WARNING, String.format("Could not format extracted metadata for file %s [id=%d]",
                        aFile.getName(), aFile.getId()), ex);
                //Just send file text.
                finalReader = fileText;
            }
            //divide into chunks and index
            return finalReader;
       
    }
 
    private void createMetadataArtifact(AbstractFile aFile, Map<String, String> metadata) {
 
        String moduleName = KeywordSearchIngestModule.class.getName();
 
        Collection<BlackboardAttribute> attributes = new ArrayList<>();
        Collection<BlackboardArtifact> bbartifacts = new ArrayList<>();
        
        Map<BlackboardAttribute.ATTRIBUTE_TYPE, Pair<Integer, String>> intermediateMapping = new HashMap<>();
        for (Map.Entry<String, String> entry : metadata.entrySet()) {
            if (entry.getValue() != null) {
                Pair<BlackboardAttribute.ATTRIBUTE_TYPE, Integer> attrPair = METADATA_TYPES_MAP.get(entry.getKey());
                if (attrPair != null && attrPair.getKey() != null && attrPair.getValue() != null) {
                    intermediateMapping.compute(attrPair.getKey(), (k, v) -> {
                        if (v == null || v.getKey() > attrPair.getValue()) {
                            return Pair.of(attrPair.getValue(), entry.getValue());
                        } else {
                            return v;
                        }
                    });
                }
            }
        }
        
        for (Entry<BlackboardAttribute.ATTRIBUTE_TYPE, Pair<Integer, String>> interEntry: intermediateMapping.entrySet()) {
            BlackboardAttribute attribute = checkAttribute(interEntry.getKey(), interEntry.getValue().getValue());
            if (attribute != null) {
                attributes.add(attribute);
            }
        }
        
        if (!attributes.isEmpty()) {
            try {
                BlackboardArtifact bbart = aFile.newDataArtifact(new BlackboardArtifact.Type(BlackboardArtifact.ARTIFACT_TYPE.TSK_METADATA), attributes);
                bbartifacts.add(bbart);
            } catch (TskCoreException ex) {
                // Log error and return to continue processing
                logger.log(Level.WARNING, String.format("Error creating or adding metadata artifact for file %s.", aFile.getParentPath() + aFile.getName()), ex); //NON-NLS
                return;
            }
            if (!bbartifacts.isEmpty()) {
                try {
                    Case.getCurrentCaseThrows().getSleuthkitCase().getBlackboard().postArtifacts(bbartifacts, moduleName, jobId);
                } catch (NoCurrentCaseException | Blackboard.BlackboardException ex) {
                    // Log error and return to continue processing
                    logger.log(Level.WARNING, String.format("Unable to post blackboard artifacts for file $s.", aFile.getParentPath() + aFile.getName()), ex); //NON-NLS
                    return;
                }
            }
        }
    }

    private BlackboardAttribute checkAttribute(BlackboardAttribute.ATTRIBUTE_TYPE attrType, String value) {
        String moduleName = KeywordSearchIngestModule.class.getName();
        if (attrType != null && !value.isEmpty() && value.charAt(0) != ' ') {
            if (attrType.getValueType() == BlackboardAttribute.TSK_BLACKBOARD_ATTRIBUTE_VALUE_TYPE.DATETIME) {
                SimpleDateFormat metadataDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", US);
                Long metadataDateTime = Long.valueOf(0);
                try {
                    String metadataDate = value.replaceAll("T", " ").replaceAll("Z", "");
                    Date usedDate = metadataDateFormat.parse(metadataDate);
                    metadataDateTime = usedDate.getTime() / 1000;
                    return new BlackboardAttribute(attrType, moduleName, metadataDateTime);
                } catch (ParseException ex) {
                    // catching error and displaying date that could not be parsed then will continue on.
                    logger.log(Level.WARNING, String.format("Failed to parse date/time %s for metadata attribute %s.", value, attrType == null ? "<null>" : attrType.name()), ex); //NON-NLS
                    return null;
                }
            } else {
                return new BlackboardAttribute(attrType, moduleName, value);
            }
        }
 
        return null;
 
    }

    @NbBundle.Messages({
        "KeywordSearchIngestModule.metadataTitle=METADATA"
    })
    static CharSource getMetaDataCharSource(Map<String, String> metadata) {
        return CharSource.wrap(new StringBuilder(
                String.format("\n\n------------------------------%s------------------------------\n\n",
                        Bundle.KeywordSearchIngestModule_metadataTitle()))
                .append(metadata.entrySet().stream().sorted(Map.Entry.comparingByKey())
                        .map(entry -> entry.getKey() + ": " + entry.getValue())
                        .collect(Collectors.joining("\n"))
                ));
    }

    private boolean extractStringsAndIndex(AbstractFile aFile) {
        try {
            if (context.fileIngestIsCancelled()) {
                return true;
            }
            Reader extractedTextReader = KeywordSearchUtil.getReader(aFile, stringsExtractionContext);
            Ingester.getDefault().search(extractedTextReader, aFile.getId(), aFile.getName(), aFile, KeywordSearchIngestModule.this.context, false, settings.isIndexToSolrEnabled(), settings.getNamesOfEnabledKeyWordLists());
            putIngestStatus(jobId, aFile.getId(), IngestStatus.STRINGS_INGESTED);               
        } catch (Exception ex) {
            logger.log(Level.WARNING, "Failed to extract strings and ingest, file '" + aFile.getName() + "' (id: " + aFile.getId() + ").", ex);  //NON-NLS
            putIngestStatus(jobId, aFile.getId(), IngestStatus.SKIPPED_ERROR_INDEXING);
            return false;
        }
        return true;
    }

    private void searchFile(Optional<TextExtractor> extractor, AbstractFile aFile, String mimeType, boolean indexContent) {
        //logger.log(Level.INFO, "Processing AbstractFile: " + abstractFile.getName());
 
        TskData.TSK_DB_FILES_TYPE_ENUM aType = aFile.getType();

        if ((aType.equals(TskData.TSK_DB_FILES_TYPE_ENUM.UNALLOC_BLOCKS)
                || aType.equals(TskData.TSK_DB_FILES_TYPE_ENUM.UNUSED_BLOCKS))
                || (aType.equals(TskData.TSK_DB_FILES_TYPE_ENUM.CARVED) && aFile.getNameExtension().equalsIgnoreCase("txt"))) {
            if (context.fileIngestIsCancelled()) {
                return;
            }
            extractStringsAndIndex(aFile);
            return;
        }
 
        final long size = aFile.getSize();
        //if not to index content, or a dir, or 0 content, index meta data only
 
        if ((indexContent == false || aFile.isDir() || size == 0)) {
            try {
                if (context.fileIngestIsCancelled()) {
                    return;
                }
                ingester.indexMetaDataOnly(aFile);
                putIngestStatus(jobId, aFile.getId(), IngestStatus.METADATA_INGESTED);
            } catch (IngesterException ex) {
                putIngestStatus(jobId, aFile.getId(), IngestStatus.SKIPPED_ERROR_INDEXING);
                logger.log(Level.WARNING, "Unable to index meta-data for file: " + aFile.getId(), ex); //NON-NLS
            }
            return;
        }
 
        if (context.fileIngestIsCancelled()) {
            return;
        }
 
        // we skip archive formats that are opened by the archive module. 
        // @@@ We could have a check here to see if the archive module was enabled though...
        if (ARCHIVE_MIME_TYPES.contains(mimeType)) {
            try {
                if (context.fileIngestIsCancelled()) {
                    return;
                }
                ingester.indexMetaDataOnly(aFile);
                putIngestStatus(jobId, aFile.getId(), IngestStatus.METADATA_INGESTED);
            } catch (IngesterException ex) {
                putIngestStatus(jobId, aFile.getId(), IngestStatus.SKIPPED_ERROR_INDEXING);
                logger.log(Level.WARNING, "Unable to index meta-data for file: " + aFile.getId(), ex); //NON-NLS
            }
            return;
        }
 
        boolean wasTextAdded = false;
        Map<String, String> extractedMetadata = new HashMap<>();
 
        //extract text with one of the extractors, divide into chunks and index with Solr
        try {
            //logger.log(Level.INFO, "indexing: " + aFile.getName());
            if (context.fileIngestIsCancelled()) {
                return;
            }
            if (MimeTypes.OCTET_STREAM.equals(mimeType)) {
                extractStringsAndIndex(aFile);
                return;
            }
            if (!extractTextAndSearch(extractor, aFile, extractedMetadata)) {
                // Text extractor not found for file. Extract string only.
                putIngestStatus(jobId, aFile.getId(), IngestStatus.SKIPPED_ERROR_TEXTEXTRACT);
            } else {
                putIngestStatus(jobId, aFile.getId(), IngestStatus.TEXT_INGESTED);
                wasTextAdded = true;
            }
 
        } catch (IngesterException e) {
            logger.log(Level.INFO, "Could not extract text with Tika, " + aFile.getId() + ", " //NON-NLS
                    + aFile.getName(), e);
            putIngestStatus(jobId, aFile.getId(), IngestStatus.SKIPPED_ERROR_INDEXING);
        } catch (Exception e) {
            logger.log(Level.WARNING, "Error extracting text with Tika, " + aFile.getId() + ", " //NON-NLS
                    + aFile.getName(), e);
            putIngestStatus(jobId, aFile.getId(), IngestStatus.SKIPPED_ERROR_TEXTEXTRACT);
        }
 
        if ((wasTextAdded == false) && (aFile.getNameExtension().equalsIgnoreCase("txt") && !(aFile.getType().equals(TskData.TSK_DB_FILES_TYPE_ENUM.CARVED)))) {
            //Carved Files should be the only type of unallocated files capable of a txt extension and 
            //should be ignored by the TextFileExtractor because they may contain more than one text encoding
            wasTextAdded = searchTextFile(aFile);
        }
 
        // if it wasn't supported or had an error, default to strings
        if (wasTextAdded == false) {
            extractStringsAndIndex(aFile);
        }
 
        // Now that the indexing is complete, create the metadata artifact (if applicable).
        // It is unclear why calling this from extractTextAndIndex() generates
        // errors.
        if (!extractedMetadata.isEmpty()) {
            createMetadataArtifact(aFile, extractedMetadata);
        }
    }

    private boolean searchTextFile(AbstractFile aFile) {
        try {
            TextFileExtractor textFileExtractor = new TextFileExtractor(aFile);
            Reader textReader = textFileExtractor.getReader();
            if (textReader == null) {
                logger.log(Level.INFO, "Unable to extract with TextFileExtractor, Reader was null for file: {0}", aFile.getName());
            } else {
                Ingester.getDefault().search(textReader, aFile.getId(), aFile.getName(), aFile, context, true, settings.isIndexToSolrEnabled(), settings.getNamesOfEnabledKeyWordLists());
                textReader.close();
                putIngestStatus(jobId, aFile.getId(), IngestStatus.TEXT_INGESTED);
                return true;
            }
        } catch (Exception ex) {
            logger.log(Level.WARNING, "Unable to index " + aFile.getName(), ex);
        }
        return false;
    }
 
}