fix Texfinder stuff, minor simplifications

Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>

app/core/src/main/java/stirling/software/SPDF/pdf/TextFinder.java

@@ -1,8 +1,12 @@
 package stirling.software.SPDF.pdf;
 
 import java.io.IOException;
+import java.text.Normalizer;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import org.apache.pdfbox.pdmodel.PDPage;
 import org.apache.pdfbox.text.PDFTextStripper;
@@ -15,45 +19,41 @@ import stirling.software.SPDF.model.PDFText;
 @Slf4j
 public class TextFinder extends PDFTextStripper {
 
-    private final String searchTerm;
+    private static String removeDiacritics(String input) {
-    private final boolean useRegex;
+        if (input == null || input.isEmpty()) return input;
-    private final boolean wholeWordSearch;
+        String nfd = Normalizer.normalize(input, Normalizer.Form.NFD);
-    private final List<PDFText> foundTexts = new ArrayList<>();
+        // remove combining diacritical marks
-
+        String stripped = nfd.replaceAll("\\p{M}+", "");
-    private final List<TextPosition> pageTextPositions = new ArrayList<>();
+        return Normalizer.normalize(stripped, Normalizer.Form.NFC);
-    private final StringBuilder pageTextBuilder = new StringBuilder();
-
-    public TextFinder(String searchTerm, boolean useRegex, boolean wholeWordSearch)
-            throws IOException {
-        this.searchTerm = searchTerm;
-        this.useRegex = useRegex;
-        this.wholeWordSearch = wholeWordSearch;
-        this.setWordSeparator(" ");
     }
 
-    @Override
+    private static NormalizedMap buildNormalizedMap(String original) {
-    protected void startPage(PDPage page) throws IOException {
+        if (original == null) return new NormalizedMap("", new int[0]);
-        super.startPage(page);
+        StringBuilder sb = new StringBuilder(original.length());
-        pageTextPositions.clear();
+        // Worst case map size equals original length
-        pageTextBuilder.setLength(0);
+        int[] tempMap = new int[original.length() * 2];
+        int normIdx = 0;
+        for (int i = 0; i < original.length(); i++) {
+            char ch = original.charAt(i);
+            // Normalize this single char; handle precomposed accents common in PDF text
+            String nfd = Normalizer.normalize(String.valueOf(ch), Normalizer.Form.NFD);
+            String base = nfd.replaceAll("\\p{M}+", "");
+            // Append each resulting char and map back to original index i
+            for (int j = 0; j < base.length(); j++) {
+                char b = base.charAt(j);
+                sb.append(b);
+                if (normIdx >= tempMap.length) {
+                    // expand temp map
+                    int[] newMap = new int[tempMap.length * 2];
+                    System.arraycopy(tempMap, 0, newMap, 0, tempMap.length);
+                    tempMap = newMap;
                 }
-
+                tempMap[normIdx++] = i;
-    @Override
-    protected void writeString(String text, List<TextPosition> textPositions) {
-        pageTextBuilder.append(text);
-        pageTextPositions.addAll(textPositions);
             }
-
-    @Override
-    protected void writeWordSeparator() {
-        pageTextBuilder.append(getWordSeparator());
-        pageTextPositions.add(null); // Placeholder for separator
         }
-
+        int[] map = new int[normIdx];
-    @Override
+        System.arraycopy(tempMap, 0, map, 0, normIdx);
-    protected void writeLineSeparator() {
+        return new NormalizedMap(sb.toString(), map);
-        pageTextBuilder.append(getLineSeparator());
-        pageTextPositions.add(null); // Placeholder for separator
     }
 
     @Override
@@ -86,6 +86,71 @@ public class TextFinder extends PDFTextStripper {
             }
         }
         if (activePattern == null) {
+            if (!this.useRegex) {
+                NormalizedMap nm = buildNormalizedMap(text);
+                String normText = nm.normalized();
+                String normTerm = removeDiacritics(processedSearchTerm);
+                List<Pattern> normPatterns =
+                        stirling.software.SPDF.utils.text.TextFinderUtils
+                                .createOptimizedSearchPatterns(
+                                        Collections.singleton(normTerm),
+                                        false,
+                                        this.wholeWordSearch);
+                Matcher nMatcher = null;
+                Pattern nActive = null;
+                for (Pattern p : normPatterns) {
+                    nMatcher = p.matcher(normText);
+                    if (nMatcher.find()) {
+                        nActive = p;
+                        break;
+                    }
+                }
+                if (nActive != null) {
+                    nMatcher = nActive.matcher(normText);
+                    int matchCount = 0;
+                    while (nMatcher.find()) {
+                        matchCount++;
+                        int nStart = nMatcher.start();
+                        int nEnd = nMatcher.end();
+                        int origStart = nm.indexMap()[nStart];
+                        int origEnd = nm.indexMap()[nEnd - 1] + 1;
+
+                        float minX = Float.MAX_VALUE;
+                        float minY = Float.MAX_VALUE;
+                        float maxX = Float.MIN_VALUE;
+                        float maxY = Float.MIN_VALUE;
+                        boolean foundPosition = false;
+
+                        for (int i = origStart; i < origEnd; i++) {
+                            if (i >= pageTextPositions.size()) continue;
+                            org.apache.pdfbox.text.TextPosition pos = pageTextPositions.get(i);
+                            if (pos != null) {
+                                foundPosition = true;
+                                minX = Math.min(minX, pos.getX());
+                                maxX = Math.max(maxX, pos.getX() + pos.getWidth());
+                                minY = Math.min(minY, pos.getY() - pos.getHeight());
+                                maxY = Math.max(maxY, pos.getY());
+                            }
+                        }
+                        if (foundPosition) {
+                            String matchedOriginal =
+                                    text.substring(
+                                            Math.max(0, origStart),
+                                            Math.min(text.length(), origEnd));
+                            foundTexts.add(
+                                    new PDFText(
+                                            this.getCurrentPageNo() - 1,
+                                            minX,
+                                            minY,
+                                            maxX,
+                                            maxY,
+                                            matchedOriginal));
+                        }
+                    }
+                    super.endPage(page);
+                    return;
+                }
+            }
             super.endPage(page);
             return;
         }
@@ -105,6 +170,26 @@ public class TextFinder extends PDFTextStripper {
             int matchStart = matcher.start();
             int matchEnd = matcher.end();
 
+            if (this.wholeWordSearch
+                    && processedSearchTerm.length() == 1
+                    && Character.isDigit(processedSearchTerm.charAt(0))) {
+                char left = matchStart > 0 ? text.charAt(matchStart - 1) : '\0';
+                char right = matchEnd < text.length() ? text.charAt(matchEnd) : '\0';
+                if (Character.isLetterOrDigit(left) || Character.isLetterOrDigit(right)) {
+                    continue; // skip
+                }
+                if ((right == '.' || right == ',')
+                        && (matchEnd + 1 < text.length()
+                                && Character.isDigit(text.charAt(matchEnd + 1)))) {
+                    continue; // skip
+                }
+                if ((left == '.' || left == ',')
+                        && (matchStart - 2 >= 0
+                                && Character.isDigit(text.charAt(matchStart - 2)))) {
+                    continue; // skip
+                }
+            }
+
             log.debug(
                     "Found match #{} at positions {}-{}: '{}'",
                     matchCount,
@@ -192,6 +277,65 @@ public class TextFinder extends PDFTextStripper {
         super.endPage(page);
     }
 
+    private final String searchTerm;
+    private final boolean useRegex;
+    private final boolean wholeWordSearch;
+    private final List<PDFText> foundTexts = new ArrayList<>();
+
+    private final List<TextPosition> pageTextPositions = new ArrayList<>();
+    private final StringBuilder pageTextBuilder = new StringBuilder();
+
+    public TextFinder(String searchTerm, boolean useRegex, boolean wholeWordSearch)
+            throws IOException {
+        this.searchTerm = searchTerm;
+        this.useRegex = useRegex;
+        this.wholeWordSearch = wholeWordSearch;
+        this.setWordSeparator(" ");
+    }
+
+    @Override
+    protected void startPage(PDPage page) throws IOException {
+        super.startPage(page);
+        pageTextPositions.clear();
+        pageTextBuilder.setLength(0);
+    }
+
+    @Override
+    protected void writeString(String text, List<TextPosition> textPositions) {
+        pageTextBuilder.append(text);
+        pageTextPositions.addAll(textPositions);
+    }
+
+    @Override
+    protected void writeWordSeparator() {
+        pageTextBuilder.append(getWordSeparator());
+        pageTextPositions.add(null); // Placeholder for separator
+    }
+
+    @Override
+    protected void writeLineSeparator() {
+        pageTextBuilder.append(getLineSeparator());
+        pageTextPositions.add(null); // Placeholder for separator
+    }
+
+    private static class NormalizedMap {
+        private final String normalized;
+        private final int[] indexMap;
+
+        NormalizedMap(String normalized, int[] indexMap) {
+            this.normalized = normalized;
+            this.indexMap = indexMap;
+        }
+
+        public String normalized() {
+            return normalized;
+        }
+
+        public int[] indexMap() {
+            return indexMap;
+        }
+    }
+
     public List<PDFText> getFoundTexts() {
         return foundTexts;
     }

app/core/src/main/java/stirling/software/SPDF/service/RedactionService.java

@@ -5,7 +5,6 @@ import java.awt.image.BufferedImage;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
@@ -317,7 +316,7 @@ public class RedactionService {
                         int start = Integer.parseInt(range[0].trim());
                         int end = Integer.parseInt(range[1].trim());
 
-                        if (start <= end && start > 0 && end > 0) {
+                        if (start <= end && start > 0) {
                             for (int i = start; i <= end; i++) {
                                 result.add(i);
                             }
@@ -347,7 +346,7 @@ public class RedactionService {
         }
 
         String colorString = hex.trim();
-        if (!colorString.startsWith("#")) {
+        if (colorString.charAt(0) != '#') {
             colorString = "#" + colorString;
         }
 
@@ -852,7 +851,7 @@ public class RedactionService {
                 copy.add(newDict);
             } else if (obj instanceof List<?> nestedList
                     && !nestedList.isEmpty()
-                    && nestedList.get(0) instanceof Object) {
+                    && nestedList.get(0) != null) {
                 try {
                     @SuppressWarnings("unchecked")
                     List<Object> objectList = (List<Object>) nestedList;
@@ -892,8 +891,7 @@ public class RedactionService {
                 TextFinderUtils.createOptimizedSearchPatterns(
                         targetWords, useRegex, wholeWordSearch);
 
-        for (int i = 0; i < segments.size(); i++) {
+        for (TextSegment segment : segments) {
-            TextSegment segment = segments.get(i);
             String segmentText = segment.getText();
             if (segmentText == null || segmentText.isEmpty()) {
                 continue;
@@ -1658,39 +1656,6 @@ public class RedactionService {
         }
     }
 
-    private static String tryEncodingFallbacks(COSString cosString) {
-        try {
-            byte[] bytes = cosString.getBytes();
-            if (bytes.length == 0) return "";
-
-            String[] encodings = {"UTF-8", "UTF-16BE", "UTF-16LE", "ISO-8859-1", "Windows-1252"};
-
-            for (String encoding : encodings) {
-                try {
-                    if (bytes.length >= 2) {
-                        if ((bytes[0] & 0xFF) == 0xFE && (bytes[1] & 0xFF) == 0xFF) {
-                            // UTF-16BE BOM
-                            return new String(
-                                    bytes, 2, bytes.length - 2, StandardCharsets.UTF_16BE);
-                        } else if ((bytes[0] & 0xFF) == 0xFF && (bytes[1] & 0xFF) == 0xFE) {
-                            // UTF-16LE BOM
-                            return new String(
-                                    bytes, 2, bytes.length - 2, StandardCharsets.UTF_16LE);
-                        }
-                    }
-
-                    String decoded = new String(bytes, encoding);
-                    if (!isGibberish(decoded)) {
-                        return decoded;
-                    }
-                } catch (Exception ignored) {
-                }
-            }
-        } catch (Exception e) {
-        }
-        return null;
-    }
-
     private float applySafetyBounds(
             WidthCalculationResult result, TextSegment segment, String text) {
         if (result.processedMatches() == 0) return 0f;

app/core/src/main/java/stirling/software/SPDF/utils/text/TextFinderUtils.java

@@ -88,7 +88,14 @@ public class TextFinderUtils {
             if (originalTerm.length() == 1) {
                 char c = originalTerm.charAt(0);
                 if (Character.isDigit(c)) {
-                    return "(?<![\\p{L}\\p{N}])" + patternString + "(?![\\p{L}\\p{N}])";
+                    // Single digit as a strict standalone token:
+                    // - Not adjacent to letters or digits
+                    // - Not part of a decimal number (e.g., 1.0 or 2,50)
+                    //   by excluding cases where a digit is immediately followed by [.,]\d
+                    //   or immediately preceded by \d[.,]
+                    String leftBoundary = "(?<![\\p{L}\\p{N}])(?<!\\d\\.)(?<!\\d,)";
+                    String rightBoundary = "(?![\\p{L}\\p{N}])(?![.,]\\d)";
+                    return leftBoundary + patternString + rightBoundary;
                 } else if (Character.isLetter(c)) {
                     return "(?<![\\p{L}\\p{N}])" + patternString + "(?![\\p{L}\\p{N}])";
                 } else {

app/core/src/main/resources/templates/security/auto-redact.html

@@ -103,7 +103,6 @@
               <div class="form-check mb-2">
                 <input aria-describedby="visual-desc" checked class="form-check-input" id="visualImage" name="redactionMode" type="radio" value="visual">
                 <label class="form-check-label" for="visualImage" th:text="#{autoRedact.visualRedactionLabel}">Visual</label>
-                <small class="form-text text-muted d-block mt-1" id="visual-desc" th:text="#{autoRedact.visualRedactionDescription}">Converts to image with visual redactions for maximum security.</small>
               </div>
               <div class="form-check mb-2">
                 <input aria-describedby="delete-desc" class="form-check-input" id="deleteText" name="redactionMode" type="radio" value="aggressive">