KeywordSearchUtil.java

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/*
 * Autopsy Forensic Browser
 *
 * Copyright 2011-2018 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 java.awt.Component;
import java.io.File;
import java.io.Reader;
import java.util.regex.Matcher;
import org.sleuthkit.autopsy.coreutils.Logger;
import javax.swing.JOptionPane;
import org.openide.util.Lookup;
import org.openide.windows.WindowManager;
import org.sleuthkit.autopsy.textextractors.TextExtractor;
import org.sleuthkit.autopsy.textextractors.TextExtractorFactory;
import org.sleuthkit.datamodel.AbstractFile;
import org.sleuthkit.datamodel.BlackboardArtifact;
import org.sleuthkit.datamodel.Content;
import org.sleuthkit.datamodel.TskCoreException;
 
class KeywordSearchUtil {
    
    private static final String SNIPPET_DELIMITER = String.valueOf(Character.toChars(171));
 
    public enum DIALOG_MESSAGE_TYPE {
 
        ERROR, WARN, INFO
    };
    private static final Logger logger = Logger.getLogger(KeywordSearchUtil.class.getName());

    public static String quoteQuery(String query) {
        //ensure a single pair of quotes around the query
        final int length = query.length();
        if (length > 1 && query.charAt(0) == '"'
                && query.charAt(length - 1) == '"') {
            return query;
        }
 
        return "\""+query+"\"";
    }

    public static String escapeLuceneQuery(String query) {
        String queryEscaped = null;
        String inputString = query.trim();
 
        if (inputString.length() == 0) {
            return inputString;
        }
 
        final String ESCAPE_CHARS = "/+-&|!(){}[]^\"~*?:\\";
        StringBuilder sb = new StringBuilder();
        final int length = inputString.length();
 
        //see if the quoery is quoted
        boolean quotedQuery = false;
        if (length > 1 && inputString.charAt(0) == '"' && inputString.charAt(length - 1) == '"') {
            quotedQuery = true;
        }
 
        for (int i = 0; i < length; ++i) {
            final char c = inputString.charAt(i);
 
            if (ESCAPE_CHARS.contains(Character.toString(c))) {
                //escape if not outter quotes
                if (quotedQuery == false || (i > 0 && i < length - 1)) {
                    sb.append("\\");
                }
            }
            sb.append(c);
        }
        queryEscaped = inputString = sb.toString();
 
        return queryEscaped;
    }
 
    public static void displayDialog(final String title, final String message, final DIALOG_MESSAGE_TYPE type) {
        int messageType;
        if (type == DIALOG_MESSAGE_TYPE.ERROR) {
            messageType = JOptionPane.ERROR_MESSAGE;
        } else if (type == DIALOG_MESSAGE_TYPE.WARN) {
            messageType = JOptionPane.WARNING_MESSAGE;
        } else {
            messageType = JOptionPane.INFORMATION_MESSAGE;
        }
 
        final Component parentComponent = WindowManager.getDefault().getMainWindow();
        JOptionPane.showMessageDialog(
                parentComponent,
                message,
                title,
                messageType);
    }
 
    public static boolean displayConfirmDialog(final String title, final String message, final DIALOG_MESSAGE_TYPE type) {
        int messageType;
        if (type == DIALOG_MESSAGE_TYPE.ERROR) {
            messageType = JOptionPane.ERROR_MESSAGE;
        } else if (type == DIALOG_MESSAGE_TYPE.WARN) {
            messageType = JOptionPane.WARNING_MESSAGE;
        } else {
            messageType = JOptionPane.INFORMATION_MESSAGE;
        }
        if (JOptionPane.showConfirmDialog(WindowManager.getDefault().getMainWindow(), message, title, JOptionPane.YES_NO_OPTION, messageType) == JOptionPane.YES_OPTION) {
            return true;
        } else {
            return false;
        }
    }
    
    static KeywordSearchQuery getQueryForKeyword(Keyword keyword, KeywordList keywordList) {
        KeywordSearchQuery query = null;
        if (keyword.searchTermIsLiteral() && keyword.searchTermIsWholeWord()) {
            // literal, exact match
            query = new LuceneQuery(keywordList, keyword);
            query.escape();
        } // regexp and literal substring match
        else {
            query = new RegexQuery(keywordList, keyword);
            if (keyword.searchTermIsLiteral()) {
                query.escape();
            }
        }
        return query;
    }
    
    static String makeSnippet(String content, Matcher hitMatcher, String hit) {
        // Get the snippet from the document.
        final int end = hitMatcher.end();
        final int start = hitMatcher.start();
 
        return makeSnippet(content, start, end, hit);
    }
    
    static String makeSnippet(String content, int startOffset, int endOffset, String hit) {
        // Get the snippet from the document.
        int maxIndex = content.length() - 1;
 
        return content.substring(Integer.max(0, startOffset - 20), Integer.max(0, startOffset))
                + SNIPPET_DELIMITER + hit + SNIPPET_DELIMITER
                + content.substring(Integer.min(maxIndex, endOffset), Integer.min(maxIndex, endOffset + 20));
    }

    static boolean isXMLList(String absPath) {
        //TODO: make this more robust, if necessary
        return new File(absPath).getName().endsWith(".xml"); //NON-NLS
    }
    
    static Reader getReader(Content content) throws TextExtractorFactory.NoTextExtractorFound, TextExtractor.InitReaderException{
        return getReader(content, null);
    }
    
    static Reader getReader(Content content, Lookup stringsExtractionContext) throws TextExtractorFactory.NoTextExtractorFound, TextExtractor.InitReaderException{
        Reader reader = null;
        if (content instanceof BlackboardArtifact) {
            BlackboardArtifact artifact = (BlackboardArtifact) content;
            if (artifact.getArtifactID() > 0) {
                /*
                 * Artifact indexing is only supported for artifacts that use
                 * negative artifact ids to avoid overlapping with the object
                 * ids of other types of Content.
                 */
                return null;
            }
            TextExtractor blackboardExtractor = TextExtractorFactory.getExtractor(content, null);
            reader = blackboardExtractor.getReader();
 
        } else if (content instanceof AbstractFile) {
            TextExtractor stringsExtractor = TextExtractorFactory.getStringsExtractor( content, stringsExtractionContext);
            reader = stringsExtractor.getReader();
        } else {
            try {
                TextExtractor contentExtractor = TextExtractorFactory.getExtractor(content, null);
                reader = contentExtractor.getReader();
            } catch (TextExtractorFactory.NoTextExtractorFound | TextExtractor.InitReaderException ex) {
                // Try the StringsTextExtractor if Tika extractions fails.
                TextExtractor stringsExtractor = TextExtractorFactory.getStringsExtractor(content, null);
                reader = stringsExtractor.getReader();
            }
        }
 
        return reader;
    }
}