mirror of
https://github.com/Frooodle/Stirling-PDF.git
synced 2025-09-08 17:51:20 +02:00
refactor(redaction): replace ThreadLocal with instance variables for aggressive mode handling
Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>
This commit is contained in:
Balázs Szücs
parent
162b19f4ad
commit
8c6aa246a7
@ -69,10 +69,8 @@ public class RedactionService {
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private static final Set<String> TEXT_SHOWING_OPERATORS = Set.of("Tj", "TJ", "'", "\"");
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private static final COSString EMPTY_COS_STRING = new COSString("");
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private static final int MAX_SWEEPS = 3;
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private static final ThreadLocal<Boolean> AGGRESSIVE_MODE =
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ThreadLocal.withInitial(() -> Boolean.FALSE);
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private static final ThreadLocal<Map<Integer, List<AggressiveSegMatch>>> AGGR_SEG_MATCHES =
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new ThreadLocal<>();
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private boolean aggressiveMode = false;
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private Map<Integer, List<AggressiveSegMatch>> aggressiveSegMatches = null;
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private final CustomPDFDocumentFactory pdfDocumentFactory;
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private static void redactAreas(
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@ -473,36 +471,12 @@ public class RedactionService {
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return map;
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}
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private static COSString redactCosStringByDecodedRanges(
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PDFont font, COSString cosString, List<AggressiveSegMatch> decRanges) {
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private static void performFallbackModification(
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List<Object> tokens, int tokenIndex, String newText) {
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try {
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byte[] bytes = cosString.getBytes();
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DecodedMapping dm = buildDecodeMapping(font, bytes);
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if (dm.text.isEmpty() || dm.charByteStart.length == 0) {
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return cosString;
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}
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boolean[] delete = new boolean[bytes.length];
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for (AggressiveSegMatch r : decRanges) {
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int ds = Math.max(0, Math.min(r.decodedStart, dm.charByteStart.length));
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int de = Math.max(ds, Math.min(r.decodedEnd, dm.charByteStart.length));
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if (ds >= de) {
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continue;
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}
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int byteStart = dm.charByteStart[ds];
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int byteEnd = dm.charByteEnd[de - 1];
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for (int bi = Math.max(0, byteStart); bi < Math.min(bytes.length, byteEnd); bi++) {
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delete[bi] = true;
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}
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}
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ByteArrayOutputStream baos = new ByteArrayOutputStream(bytes.length);
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for (int bi = 0; bi < bytes.length; bi++) {
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if (!delete[bi]) {
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baos.write(bytes[bi]);
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}
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}
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return new COSString(baos.toByteArray());
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tokens.set(tokenIndex, newText.isEmpty() ? EMPTY_COS_STRING : new COSString(newText));
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} catch (Exception e) {
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return Boolean.TRUE.equals(AGGRESSIVE_MODE.get()) ? EMPTY_COS_STRING : cosString;
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performEmergencyFallback(tokens, tokenIndex);
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}
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}
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@ -817,6 +791,81 @@ public class RedactionService {
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}
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}
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private static void writeRedactedContentToPattern(
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PDTilingPattern pattern, List<Object> redactedTokens) throws IOException {
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var contentStream = pattern.getContentStream();
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try (var out = contentStream.createOutputStream()) {
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new ContentStreamWriter(out).writeTokens(redactedTokens);
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}
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}
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public boolean performTextReplacement(
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PDDocument document,
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Map<Integer, List<PDFText>> allFoundTextsByPage,
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String[] listOfText,
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boolean useRegex,
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boolean wholeWordSearchBool) {
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if (allFoundTextsByPage.isEmpty()) {
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return false;
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}
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try {
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Set<String> allSearchTerms =
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Arrays.stream(listOfText)
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.map(String::trim)
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.filter(s -> !s.isEmpty())
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.collect(Collectors.toSet());
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for (int sweep = 0; sweep < MAX_SWEEPS; sweep++) {
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for (PDPage page : document.getPages()) {
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List<Object> filtered =
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createTokensWithoutTargetText(
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document, page, allSearchTerms, useRegex, wholeWordSearchBool);
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writeFilteredContentStream(document, page, filtered);
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}
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// Stop early if nothing remains
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if (!documentStillContainsTargets(
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document, allSearchTerms, useRegex, wholeWordSearchBool)) {
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break;
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}
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}
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return false;
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} catch (Exception e) {
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return true;
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}
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}
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private COSString redactCosStringByDecodedRanges(
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PDFont font, COSString cosString, List<AggressiveSegMatch> decRanges) {
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try {
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byte[] bytes = cosString.getBytes();
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DecodedMapping dm = buildDecodeMapping(font, bytes);
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if (dm.text.isEmpty() || dm.charByteStart.length == 0) {
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return cosString;
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}
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boolean[] delete = new boolean[bytes.length];
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for (AggressiveSegMatch r : decRanges) {
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int ds = Math.max(0, Math.min(r.decodedStart, dm.charByteStart.length));
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int de = Math.max(ds, Math.min(r.decodedEnd, dm.charByteStart.length));
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if (ds >= de) {
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continue;
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}
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int byteStart = dm.charByteStart[ds];
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int byteEnd = dm.charByteEnd[de - 1];
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for (int bi = Math.max(0, byteStart); bi < Math.min(bytes.length, byteEnd); bi++) {
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delete[bi] = true;
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}
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}
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ByteArrayOutputStream baos = new ByteArrayOutputStream(bytes.length);
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for (int bi = 0; bi < bytes.length; bi++) {
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if (!delete[bi]) {
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baos.write(bytes[bi]);
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}
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}
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return new COSString(baos.toByteArray());
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} catch (Exception e) {
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return this.aggressiveMode ? EMPTY_COS_STRING : cosString;
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}
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}
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public void performTextReplacementAggressive(
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PDDocument document,
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Map<Integer, List<PDFText>> allFoundTextsByPage,
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@ -831,7 +880,8 @@ public class RedactionService {
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.map(String::trim)
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.filter(s -> !s.isEmpty())
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.collect(Collectors.toSet());
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AGGRESSIVE_MODE.set(Boolean.TRUE);
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this.aggressiveMode = true;
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this.aggressiveSegMatches = new HashMap<>();
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try {
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for (int sweep = 0; sweep < MAX_SWEEPS; sweep++) {
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boolean anyResidual = false;
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@ -839,7 +889,7 @@ public class RedactionService {
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for (PDPage page : document.getPages()) {
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pageIndex++;
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try {
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AGGR_SEG_MATCHES.remove();
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this.aggressiveSegMatches = new HashMap<>();
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List<Object> filtered =
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createTokensWithoutTargetText(
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document,
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@ -884,88 +934,8 @@ public class RedactionService {
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}
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}
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} finally {
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AGGRESSIVE_MODE.remove();
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}
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}
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public boolean performTextReplacement(
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PDDocument document,
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Map<Integer, List<PDFText>> allFoundTextsByPage,
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String[] listOfText,
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boolean useRegex,
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boolean wholeWordSearchBool) {
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if (allFoundTextsByPage.isEmpty()) {
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return false;
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}
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try {
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Set<String> allSearchTerms =
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Arrays.stream(listOfText)
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.map(String::trim)
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.filter(s -> !s.isEmpty())
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.collect(Collectors.toSet());
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for (int sweep = 0; sweep < MAX_SWEEPS; sweep++) {
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for (PDPage page : document.getPages()) {
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List<Object> filtered =
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createTokensWithoutTargetText(
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document, page, allSearchTerms, useRegex, wholeWordSearchBool);
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writeFilteredContentStream(document, page, filtered);
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}
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// Stop early if nothing remains
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if (!documentStillContainsTargets(
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document, allSearchTerms, useRegex, wholeWordSearchBool)) {
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break;
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}
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}
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return false;
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} catch (Exception e) {
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return true;
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}
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}
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List<Object> createTokensWithoutTargetText(
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PDDocument document,
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PDPage page,
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Set<String> targetWords,
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boolean useRegex,
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boolean wholeWordSearch)
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throws IOException {
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PDFStreamParser parser = new PDFStreamParser(page);
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List<Object> tokens = new ArrayList<>();
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Object tk;
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while (true) {
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final Object parsedNextToken = parser.parseNextToken();
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if ((tk = parsedNextToken) == null) break;
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tokens.add(tk);
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}
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PDResources resources = page.getResources();
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if (resources != null) {
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processPageXObjects(document, resources, targetWords, useRegex, wholeWordSearch);
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}
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List<TextSegment> textSegments =
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extractTextSegments(page, tokens, Boolean.TRUE.equals(AGGRESSIVE_MODE.get()));
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String completeText = buildCompleteText(textSegments);
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List<MatchRange> matches =
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Boolean.TRUE.equals(AGGRESSIVE_MODE.get())
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? findAllMatchesAggressive(
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textSegments, tokens, targetWords, useRegex, wholeWordSearch)
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: findAllMatches(completeText, targetWords, useRegex, wholeWordSearch);
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return applyRedactionsToTokens(tokens, textSegments, matches);
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}
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private void processPageXObjects(
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PDDocument document,
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PDResources resources,
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Set<String> targetWords,
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boolean useRegex,
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boolean wholeWordSearch) {
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for (COSName xobjName : resources.getXObjectNames()) {
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try {
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PDXObject xobj = resources.getXObject(xobjName);
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if (xobj instanceof PDFormXObject formXObj) {
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processFormXObject(document, formXObj, targetWords, useRegex, wholeWordSearch);
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}
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} catch (Exception ignored) {
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}
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this.aggressiveMode = false;
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this.aggressiveSegMatches = null;
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}
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}
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@ -1073,12 +1043,39 @@ public class RedactionService {
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return sb.toString();
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}
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private static void performFallbackModification(List<Object> tokens, int tokenIndex, String newText) {
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try {
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tokens.set(tokenIndex, newText.isEmpty() ? EMPTY_COS_STRING : new COSString(newText));
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} catch (Exception e) {
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performEmergencyFallback(tokens, tokenIndex);
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List<Object> createTokensWithoutTargetText(
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PDDocument document,
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PDPage page,
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Set<String> targetWords,
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boolean useRegex,
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boolean wholeWordSearch)
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throws IOException {
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PDFStreamParser parser = new PDFStreamParser(page);
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List<Object> tokens = new ArrayList<>();
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Object tk;
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while (true) {
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final Object parsedNextToken = parser.parseNextToken();
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if ((tk = parsedNextToken) == null) break;
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tokens.add(tk);
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}
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PDResources resources = page.getResources();
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if (resources != null) {
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processPageXObjects(
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document,
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resources,
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targetWords,
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useRegex,
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wholeWordSearch,
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this.aggressiveMode);
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}
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List<TextSegment> textSegments = extractTextSegments(page, tokens, this.aggressiveMode);
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String completeText = buildCompleteText(textSegments);
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List<MatchRange> matches =
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this.aggressiveMode
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? findAllMatchesAggressive(
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textSegments, tokens, targetWords, useRegex, wholeWordSearch)
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: findAllMatches(completeText, targetWords, useRegex, wholeWordSearch);
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return applyRedactionsToTokens(tokens, textSegments, matches);
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}
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private static void performEmergencyFallback(List<Object> tokens, int tokenIndex) {
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@ -1089,50 +1086,23 @@ public class RedactionService {
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}
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}
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private String applyRedactionsToSegmentText(TextSegment segment, List<MatchRange> matches) {
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String text = segment.getText();
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if (!Boolean.TRUE.equals(AGGRESSIVE_MODE.get())
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&& segment.getFont() != null
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&& !TextEncodingHelper.isTextSegmentRemovable(segment.getFont(), text)) {
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return text;
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}
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StringBuilder result = new StringBuilder(text);
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for (MatchRange match : matches) {
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int segmentStart = Math.max(0, match.getStartPos() - segment.getStartPos());
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int segmentEnd = Math.min(text.length(), match.getEndPos() - segment.getStartPos());
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if (segmentStart < text.length() && segmentEnd > segmentStart) {
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String originalPart = text.substring(segmentStart, segmentEnd);
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if (!Boolean.TRUE.equals(AGGRESSIVE_MODE.get())
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&& segment.getFont() != null
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&& !TextEncodingHelper.isTextSegmentRemovable(
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segment.getFont(), originalPart)) {
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continue;
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}
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if (Boolean.TRUE.equals(AGGRESSIVE_MODE.get())) {
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result.replace(segmentStart, segmentEnd, "");
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} else {
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float originalWidth = 0;
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if (segment.getFont() != null && segment.getFontSize() > 0) {
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originalWidth =
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safeGetStringWidth(segment.getFont(), originalPart)
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/ FONT_SCALE_FACTOR
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* segment.getFontSize();
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}
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String placeholder =
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(originalWidth > 0)
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? createPlaceholderWithWidth(
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originalPart,
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originalWidth,
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segment.getFont(),
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segment.getFontSize())
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: createPlaceholderWithFont(originalPart, segment.getFont());
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result.replace(segmentStart, segmentEnd, placeholder);
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private void processPageXObjects(
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PDDocument document,
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PDResources resources,
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Set<String> targetWords,
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boolean useRegex,
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boolean wholeWordSearch,
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boolean aggressive) {
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for (COSName xobjName : resources.getXObjectNames()) {
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try {
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PDXObject xobj = resources.getXObject(xobjName);
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if (xobj instanceof PDFormXObject formXObj) {
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processFormXObject(
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document, formXObj, targetWords, useRegex, wholeWordSearch, aggressive);
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}
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} catch (Exception ignored) {
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}
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}
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return result.toString();
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}
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private float safeGetStringWidth(PDFont font, String text) {
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@ -1358,12 +1328,50 @@ public class RedactionService {
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return copy;
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}
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private static void writeRedactedContentToPattern(PDTilingPattern pattern, List<Object> redactedTokens)
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throws IOException {
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var contentStream = pattern.getContentStream();
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try (var out = contentStream.createOutputStream()) {
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new ContentStreamWriter(out).writeTokens(redactedTokens);
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private String applyRedactionsToSegmentText(TextSegment segment, List<MatchRange> matches) {
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String text = segment.getText();
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if (!this.aggressiveMode
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&& segment.getFont() != null
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&& !TextEncodingHelper.isTextSegmentRemovable(segment.getFont(), text)) {
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return text;
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}
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StringBuilder result = new StringBuilder(text);
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for (MatchRange match : matches) {
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int segmentStart = Math.max(0, match.getStartPos() - segment.getStartPos());
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int segmentEnd = Math.min(text.length(), match.getEndPos() - segment.getStartPos());
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if (segmentStart < text.length() && segmentEnd > segmentStart) {
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String originalPart = text.substring(segmentStart, segmentEnd);
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if (!this.aggressiveMode
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&& segment.getFont() != null
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&& !TextEncodingHelper.isTextSegmentRemovable(
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segment.getFont(), originalPart)) {
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continue;
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}
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if (this.aggressiveMode) {
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result.replace(segmentStart, segmentEnd, "");
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} else {
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float originalWidth = 0;
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if (segment.getFont() != null && segment.getFontSize() > 0) {
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originalWidth =
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safeGetStringWidth(segment.getFont(), originalPart)
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/ FONT_SCALE_FACTOR
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* segment.getFontSize();
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}
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String placeholder =
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(originalWidth > 0)
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? createPlaceholderWithWidth(
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originalPart,
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originalWidth,
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segment.getFont(),
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segment.getFontSize())
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: createPlaceholderWithFont(originalPart, segment.getFont());
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result.replace(segmentStart, segmentEnd, placeholder);
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}
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}
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}
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return result.toString();
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}
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private List<MatchRange> findAllMatchesAggressive(
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@ -1497,9 +1505,9 @@ public class RedactionService {
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}
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}
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if (!perSegMatches.isEmpty()) {
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AGGR_SEG_MATCHES.set(perSegMatches);
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this.aggressiveSegMatches = perSegMatches;
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} else {
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AGGR_SEG_MATCHES.remove();
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this.aggressiveSegMatches = null;
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}
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for (TextSegment seg : segments) {
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@ -1564,8 +1572,8 @@ public class RedactionService {
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private List<Object> applyRedactionsToTokens(
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List<Object> tokens, List<TextSegment> textSegments, List<MatchRange> matches) {
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List<Object> newTokens = new ArrayList<>(tokens);
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if (Boolean.TRUE.equals(AGGRESSIVE_MODE.get())) {
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Map<Integer, List<AggressiveSegMatch>> perSeg = AGGR_SEG_MATCHES.get();
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if (this.aggressiveMode) {
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Map<Integer, List<AggressiveSegMatch>> perSeg = this.aggressiveSegMatches;
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if (perSeg != null && !perSeg.isEmpty()) {
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List<Integer> segIndices = new ArrayList<>(perSeg.keySet());
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segIndices.sort(
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@ -1887,7 +1895,7 @@ public class RedactionService {
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"Processing redaction: segment={}, matches={}, aggressive={}",
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segment,
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matches.size(),
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AGGRESSIVE_MODE.get());
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this.aggressiveMode);
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try {
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COSArray newArray = new COSArray();
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@ -2233,7 +2241,7 @@ public class RedactionService {
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String originalText = getDecodedString(cosString, segment.getFont());
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if (!Boolean.TRUE.equals(AGGRESSIVE_MODE.get())
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if (!this.aggressiveMode
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&& segment.getFont() != null
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&& !TextEncodingHelper.isTextSegmentRemovable(segment.getFont(), originalText)) {
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newArray.add(cosString); // Keep original COSString to preserve encoding
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@ -2245,9 +2253,7 @@ public class RedactionService {
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// Sort matches by start position to process them in order
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List<MatchRange> sortedMatches =
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matches.stream()
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.sorted(Comparator.comparingInt(MatchRange::getStartPos))
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.toList();
|
||||
matches.stream().sorted(Comparator.comparingInt(MatchRange::getStartPos)).toList();
|
||||
|
||||
int cumulativeOffset = 0; // Track cumulative text changes
|
||||
|
||||
@ -2265,14 +2271,15 @@ public class RedactionService {
|
||||
newText.length(),
|
||||
overlapEnd - stringStartInPage - cumulativeOffset);
|
||||
|
||||
if (redactionEndInString <= newText.length() && redactionStartInString < redactionEndInString) {
|
||||
if (redactionEndInString <= newText.length()
|
||||
&& redactionStartInString < redactionEndInString) {
|
||||
|
||||
String originalPart =
|
||||
originalText.substring(
|
||||
overlapStart - stringStartInPage,
|
||||
overlapEnd - stringStartInPage);
|
||||
|
||||
if (!Boolean.TRUE.equals(AGGRESSIVE_MODE.get())
|
||||
if (!this.aggressiveMode
|
||||
&& segment.getFont() != null
|
||||
&& !TextEncodingHelper.isTextSegmentRemovable(
|
||||
segment.getFont(), originalPart)) {
|
||||
@ -2282,7 +2289,7 @@ public class RedactionService {
|
||||
modified = true;
|
||||
String replacement = "";
|
||||
|
||||
if (!Boolean.TRUE.equals(AGGRESSIVE_MODE.get())) {
|
||||
if (!this.aggressiveMode) {
|
||||
replacement = createSafeReplacement(originalPart, segment);
|
||||
}
|
||||
|
||||
@ -2297,7 +2304,7 @@ public class RedactionService {
|
||||
COSString newCosString = createCompatibleCOSString(modifiedString, cosString);
|
||||
newArray.add(newCosString);
|
||||
|
||||
if (modified && !Boolean.TRUE.equals(AGGRESSIVE_MODE.get())) {
|
||||
if (modified && !this.aggressiveMode) {
|
||||
addSpacingAdjustment(newArray, segment, originalText, modifiedString);
|
||||
}
|
||||
}
|
||||
@ -2505,7 +2512,8 @@ public class RedactionService {
|
||||
PDFormXObject formXObject,
|
||||
Set<String> targetWords,
|
||||
boolean useRegex,
|
||||
boolean wholeWordSearch) {
|
||||
boolean wholeWordSearch,
|
||||
boolean aggressive) {
|
||||
try {
|
||||
PDResources xobjResources = formXObject.getResources();
|
||||
if (xobjResources == null) {
|
||||
@ -2515,7 +2523,12 @@ public class RedactionService {
|
||||
PDXObject nestedXObj = xobjResources.getXObject(xobjName);
|
||||
if (nestedXObj instanceof PDFormXObject nestedFormXObj) {
|
||||
processFormXObject(
|
||||
document, nestedFormXObj, targetWords, useRegex, wholeWordSearch);
|
||||
document,
|
||||
nestedFormXObj,
|
||||
targetWords,
|
||||
useRegex,
|
||||
wholeWordSearch,
|
||||
aggressive);
|
||||
}
|
||||
}
|
||||
PDFStreamParser parser = new PDFStreamParser(formXObject);
|
||||
@ -2527,7 +2540,7 @@ public class RedactionService {
|
||||
List<TextSegment> textSegments = extractTextSegmentsFromXObject(xobjResources, tokens);
|
||||
String completeText = buildCompleteText(textSegments);
|
||||
List<MatchRange> matches =
|
||||
Boolean.TRUE.equals(AGGRESSIVE_MODE.get())
|
||||
aggressive
|
||||
? findAllMatchesAggressive(
|
||||
textSegments, tokens, targetWords, useRegex, wholeWordSearch)
|
||||
: findAllMatches(completeText, targetWords, useRegex, wholeWordSearch);
|
||||
@ -2535,7 +2548,7 @@ public class RedactionService {
|
||||
List<Object> redactedTokens =
|
||||
applyRedactionsToTokens(tokens, textSegments, matches);
|
||||
writeRedactedContentToXObject(document, formXObject, redactedTokens);
|
||||
} else if (Boolean.TRUE.equals(AGGRESSIVE_MODE.get()) && !completeText.isEmpty()) {
|
||||
} else if (aggressive && !completeText.isEmpty()) {
|
||||
WipeResult wr = wipeAllTextShowingOperators(tokens);
|
||||
writeRedactedContentToXObject(document, formXObject, wr.tokens);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user