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feat: enhance PDF redaction capabilities with improved handling of complex document structures, and various redaction area scenarios

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Balázs Szücs 2025-07-15 17:41:45 +02:00
parent 03e252f9e8
commit 809d016f17
2 changed files with 1098 additions and 845 deletions
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1634
stirling-pdf/src/main/java/stirling/software/SPDF/controller/api/security/RedactController.java
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309
stirling-pdf/src/test/java/stirling/software/SPDF/controller/api/security/RedactControllerTest.java
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@ -224,6 +224,78 @@ class RedactControllerTest {
void redactMultipleSearchTerms() throws Exception {
testAutoRedaction("confidential\nsecret\nprivate\nclassified", false, true, "#FF0000", 2.0f, false, true);
}
@Test
@DisplayName("Should handle very large number of search terms")
void handleLargeNumberOfSearchTerms() throws Exception {
StringBuilder terms = new StringBuilder();
for (int i = 0; i < 100; i++) {
terms.append("term").append(i).append("\n");
}
testAutoRedaction(terms.toString(), false, false, "#000000", 1.0f, false, true);
}
@Test
@DisplayName("Should handle complex document structure")
void handleComplexDocumentStructure() throws Exception {
when(mockPages.getCount()).thenReturn(5);
when(mockDocument.getNumberOfPages()).thenReturn(5);
List<PDPage> pageList = new ArrayList<>();
for (int i = 0; i < 5; i++) {
PDPage page = mock(PDPage.class);
PDRectangle pageRect = new PDRectangle(0, 0, 612, 792);
when(page.getCropBox()).thenReturn(pageRect);
when(page.getMediaBox()).thenReturn(pageRect);
when(page.getBBox()).thenReturn(pageRect);
when(page.hasContents()).thenReturn(true);
InputStream mockInputStream = new ByteArrayInputStream(
("BT /F1 12 Tf 100 200 Td (page " + i + " content with confidential info) Tj ET").getBytes());
when(page.getContents()).thenReturn(mockInputStream);
pageList.add(page);
}
when(mockPages.iterator()).thenReturn(pageList.iterator());
for (int i = 0; i < 5; i++) {
when(mockPages.get(i)).thenReturn(pageList.get(i));
}
testAutoRedaction("confidential", false, false, "#000000", 1.0f, false, true);
// Reset to original state
reset(mockPages);
when(mockPages.getCount()).thenReturn(1);
when(mockPages.get(0)).thenReturn(mockPage);
when(mockPages.iterator()).thenReturn(Collections.singletonList(mockPage).iterator());
when(mockDocument.getNumberOfPages()).thenReturn(1);
}
@Test
@DisplayName("Should handle document with metadata")
void handleDocumentWithMetadata() throws Exception {
RedactPdfRequest request = createRedactPdfRequest();
request.setListOfText("confidential");
request.setUseRegex(false);
request.setWholeWordSearch(false);
request.setRedactColor("#000000");
request.setCustomPadding(1.0f);
request.setConvertPDFToImage(false);
when(mockPages.get(0)).thenReturn(mockPage);
org.apache.pdfbox.pdmodel.PDDocumentInformation mockInfo = mock(org.apache.pdfbox.pdmodel.PDDocumentInformation.class);
when(mockDocument.getDocumentInformation()).thenReturn(mockInfo);
ResponseEntity<byte[]> response = redactController.redactPdf(request);
assertNotNull(response);
assertEquals(200, response.getStatusCode().value());
verify(mockDocument).save(any(ByteArrayOutputStream.class));
verify(mockDocument).close();
}
}
@Nested
@ -283,14 +355,6 @@ class RedactControllerTest {
void handleWordBoundariesCorrectly() throws Exception {
testAutoRedaction("confidential", false, true, "#FF0000", 1.0f, false, true);
}
@Test
@DisplayName("Should distinguish between partial and whole word matches")
void distinguishBetweenPartialAndWholeWordMatches() throws Exception {
// Test both whole word and partial matching
testAutoRedaction("secret", false, true, "#000000", 1.0f, false, true);
testAutoRedaction("secret", false, false, "#000000", 1.0f, false, true);
}
}
@Nested
@ -419,6 +483,74 @@ class RedactControllerTest {
List<RedactionArea> overlappingAreas = createOverlappingRedactionAreas();
testManualRedaction(overlappingAreas, false);
}
@Test
@DisplayName("Should handle redaction areas with different colors")
void handleRedactionAreasWithDifferentColors() throws Exception {
List<RedactionArea> areas = new ArrayList<>();
String[] colors = {"FF0000", "00FF00", "0000FF", "FFFF00", "FF00FF", "00FFFF"};
for (int i = 0; i < colors.length; i++) {
RedactionArea area = new RedactionArea();
area.setPage(1);
area.setX(50.0 + (i * 60));
area.setY(50.0);
area.setWidth(50.0);
area.setHeight(30.0);
area.setColor(colors[i]);
areas.add(area);
}
testManualRedaction(areas, false);
}
@Test
@DisplayName("Should handle redaction areas on multiple pages")
void handleRedactionAreasOnMultiplePages() throws Exception {
when(mockPages.getCount()).thenReturn(3);
when(mockDocument.getNumberOfPages()).thenReturn(3);
List<PDPage> pageList = new ArrayList<>();
for (int i = 0; i < 3; i++) {
PDPage page = mock(PDPage.class);
PDRectangle pageRect = new PDRectangle(0, 0, 612, 792);
when(page.getCropBox()).thenReturn(pageRect);
when(page.getMediaBox()).thenReturn(pageRect);
when(page.getBBox()).thenReturn(pageRect);
when(page.hasContents()).thenReturn(true);
InputStream mockInputStream = new ByteArrayInputStream(
("BT /F1 12 Tf 100 200 Td (page " + i + " content) Tj ET").getBytes());
when(page.getContents()).thenReturn(mockInputStream);
pageList.add(page);
}
when(mockPages.iterator()).thenReturn(pageList.iterator());
for (int i = 0; i < 3; i++) {
when(mockPages.get(i)).thenReturn(pageList.get(i));
}
List<RedactionArea> areas = new ArrayList<>();
for (int i = 0; i < 3; i++) {
RedactionArea area = new RedactionArea();
area.setPage(i + 1); // Pages are 1-indexed
area.setX(100.0);
area.setY(100.0);
area.setWidth(200.0);
area.setHeight(50.0);
area.setColor("000000");
areas.add(area);
}
testManualRedaction(areas, false);
reset(mockPages);
when(mockPages.getCount()).thenReturn(1);
when(mockPages.get(0)).thenReturn(mockPage);
when(mockPages.iterator()).thenReturn(Collections.singletonList(mockPage).iterator());
when(mockDocument.getNumberOfPages()).thenReturn(1);
}
}
@Nested
@ -507,6 +639,55 @@ class RedactControllerTest {
void handleWhitespaceOnlySearchTerms(String whitespacePattern) throws Exception {
testAutoRedaction(whitespacePattern, false, false, "#000000", 1.0f, false, true);
}
@Test
@DisplayName("Should handle null redact color gracefully")
void handleNullRedactColor() throws Exception {
RedactPdfRequest request = createRedactPdfRequest();
request.setListOfText("test");
request.setRedactColor(null);
ResponseEntity<byte[]> response = redactController.redactPdf(request);
assertNotNull(response);
assertEquals(200, response.getStatusCode().value());
}
@Test
@DisplayName("Should handle negative padding gracefully")
void handleNegativePadding() throws Exception {
testAutoRedaction("test", false, false, "#000000", -1.0f, false, true);
}
@Test
@DisplayName("Should handle extremely large padding")
void handleExtremelyLargePadding() throws Exception {
testAutoRedaction("test", false, false, "#000000", 100.0f, false, true);
}
@Test
@DisplayName("Should handle null manual redaction areas gracefully")
void handleNullManualRedactionAreas() throws Exception {
ManualRedactPdfRequest request = createManualRedactPdfRequest();
request.setRedactions(null);
ResponseEntity<byte[]> response = redactController.redactPDF(request);
assertNotNull(response);
assertEquals(200, response.getStatusCode().value());
}
@Test
@DisplayName("Should handle out of bounds page numbers gracefully")
void handleOutOfBoundsPageNumbers() throws Exception {
ManualRedactPdfRequest request = createManualRedactPdfRequest();
request.setPageNumbers("100-200");
ResponseEntity<byte[]> response = redactController.redactPDF(request);
assertNotNull(response);
assertEquals(200, response.getStatusCode().value());
}
}
@Nested
@ -765,14 +946,8 @@ class RedactControllerTest {
Set<String> targetWords = Set.of("confidential");
List<Object> originalTokens = getOriginalTokens();
List<Object> filteredTokens = redactController.createTokensWithoutTargetText(realPage, targetWords, false, false);
long originalPositioning = originalTokens.stream()
.filter(token -> token instanceof Operator op &&
(op.getName().equals("Td") || op.getName().equals("TD") || op.getName().equals("Tm")))
.count();
long filteredPositioning = filteredTokens.stream()
.filter(token -> token instanceof Operator op &&
(op.getName().equals("Td") || op.getName().equals("TD") || op.getName().equals("Tm")))
@ -781,6 +956,112 @@ class RedactControllerTest {
assertTrue(filteredPositioning > 0,
"Positioning operators should be preserved");
}
@Test
@DisplayName("Should handle complex content streams with multiple operators")
void shouldHandleComplexContentStreams() throws Exception {
realPage = new PDPage(PDRectangle.A4);
while (realDocument.getNumberOfPages() > 0) {
realDocument.removePage(0);
}
realDocument.addPage(realPage);
realPage.setResources(new PDResources());
realPage.getResources().put(COSName.getPDFName("F1"), new PDType1Font(Standard14Fonts.FontName.HELVETICA));
try (PDPageContentStream contentStream = new PDPageContentStream(realDocument, realPage)) {
contentStream.setLineWidth(2);
contentStream.moveTo(100, 100);
contentStream.lineTo(200, 200);
contentStream.stroke();
contentStream.beginText();
contentStream.setFont(realPage.getResources().getFont(COSName.getPDFName("F1")), 12);
contentStream.newLineAtOffset(50, 750);
contentStream.showText("This is a complex document with ");
contentStream.setTextRise(5);
contentStream.showText("confidential");
contentStream.setTextRise(0);
contentStream.showText(" information.");
contentStream.endText();
contentStream.addRect(300, 300, 100, 100);
contentStream.fill();
}
Set<String> targetWords = Set.of("confidential");
List<Object> tokens = redactController.createTokensWithoutTargetText(realPage, targetWords, false, false);
assertNotNull(tokens);
assertFalse(tokens.isEmpty());
String reconstructedText = extractTextFromTokens(tokens);
assertFalse(reconstructedText.contains("confidential"), "Target text should be redacted");
boolean hasGraphicsOperators = tokens.stream()
.anyMatch(token -> token instanceof Operator op &&
(op.getName().equals("re") || op.getName().equals("f") ||
op.getName().equals("m") || op.getName().equals("l") ||
op.getName().equals("S")));
assertTrue(hasGraphicsOperators, "Graphics operators should be preserved");
}
@Test
@DisplayName("Should handle documents with multiple text blocks")
void shouldHandleDocumentsWithMultipleTextBlocks() throws Exception {
// Create a document with multiple text blocks
realPage = new PDPage(PDRectangle.A4);
while (realDocument.getNumberOfPages() > 0) {
realDocument.removePage(0);
}
realDocument.addPage(realPage);
// Create resources
PDResources resources = new PDResources();
resources.put(COSName.getPDFName("F1"), new PDType1Font(Standard14Fonts.FontName.HELVETICA));
realPage.setResources(resources);
try (PDPageContentStream contentStream = new PDPageContentStream(realDocument, realPage)) {
contentStream.beginText();
contentStream.setFont(new PDType1Font(Standard14Fonts.FontName.HELVETICA), 12);
contentStream.newLineAtOffset(50, 750);
contentStream.showText("This is the first text block");
contentStream.endText();
contentStream.setLineWidth(2);
contentStream.moveTo(100, 700);
contentStream.lineTo(200, 700);
contentStream.stroke();
contentStream.beginText();
contentStream.setFont(new PDType1Font(Standard14Fonts.FontName.HELVETICA), 12);
contentStream.newLineAtOffset(50, 650);
contentStream.showText("This block contains confidential information");
contentStream.endText();
contentStream.addRect(100, 600, 100, 50);
contentStream.fill();
contentStream.beginText();
contentStream.setFont(new PDType1Font(Standard14Fonts.FontName.HELVETICA), 12);
contentStream.newLineAtOffset(50, 550);
contentStream.showText("This is the third text block");
contentStream.endText();
}
RedactPdfRequest request = createRedactPdfRequest();
request.setListOfText("confidential");
request.setUseRegex(false);
request.setWholeWordSearch(false);
ResponseEntity<byte[]> response = redactController.redactPdf(request);
assertNotNull(response);
assertEquals(200, response.getStatusCode().value());
assertNotNull(response.getBody());
assertTrue(response.getBody().length > 0);
}
}
private RedactPdfRequest createRedactPdfRequest() {