DFR-2943 d11 served blank

src/main/java/uk/gov/hmcts/reform/finrem/caseorchestration/service/BulkPrintDocumentService.java

@@ -26,10 +26,11 @@ public List<byte[]> downloadDocuments(BulkPrintRequest bulkPrintRequest, String
         log.info("Downloading document for bulk print for Case ID: {}", caseId);
 
         List<byte[]> documents = bulkPrintRequest.getBulkPrintDocuments().stream()
-            .map(bulkPrintDocument -> service.download(bulkPrintDocument.getBinaryFileUrl(), auth))
+            .map(bulkPrintDocument -> documentConversionService.flattenPdfDocument(service.download(bulkPrintDocument.getBinaryFileUrl(), auth)))
             .toList();
         log.info("Download document count for bulk print {} for Case ID: {} ", documents.size(),
             caseId);
+
         return documents;
     }
 

src/main/java/uk/gov/hmcts/reform/finrem/caseorchestration/service/DocumentConversionService.java

@@ -4,6 +4,9 @@
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.io.output.ByteArrayOutputStream;
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
 import org.apache.tika.Tika;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.io.FileSystemResource;
@@ -57,6 +60,23 @@ public String getConvertedFilename(String filename) {
         return FilenameUtils.getBaseName(filename) + ".pdf";
     }
 
+    public byte[] flattenPdfDocument(byte[] document) {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+
+        try {
+            PDDocument doc = PDDocument.load(document);
+            PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
+
+            acroForm.flatten();
+            doc.save(bos);
+            doc.close();
+            return bos.toByteArray();
+        } catch (IOException e) {
+            log.error("Unable to flatten document");
+        }
+        return document;
+    }
+
     private byte[] convert(Document sourceDocument, String auth) {
         try {
             String filename = getConvertedFilename(sourceDocument.getFileName());

src/test/java/uk/gov/hmcts/reform/finrem/caseorchestration/service/documentgenerator/BulkPrintDocumentServiceTest.java

@@ -36,6 +36,7 @@ class BulkPrintDocumentServiceTest {
     private static final String DOC_FILE_NAME = "abc.docx";
     public static final String AUTH = "auth";
     private final byte[] someBytes = "ainhsdcnoih".getBytes();
+    private final byte[] someFlattenedBytes = "ainhsdcnoih_flattened".getBytes();
     @InjectMocks
     private BulkPrintDocumentService service;
 
@@ -48,6 +49,7 @@ class BulkPrintDocumentServiceTest {
     @Test
     void downloadDocuments() {
         when(evidenceManagementService.download(FILE_URL, AUTH)).thenReturn(someBytes);
+        when(documentConversionService.flattenPdfDocument(someBytes)).thenReturn(someFlattenedBytes);
 
         BulkPrintRequest bulkPrintRequest = BulkPrintRequest.builder()
             .bulkPrintDocuments(singletonList(BulkPrintDocument.builder()
@@ -57,7 +59,7 @@ void downloadDocuments() {
             .build();
 
         List<byte[]> result = service.downloadDocuments(bulkPrintRequest, AUTH);
-        assertThat(result.get(0), is(equalTo(someBytes)));
+        assertThat(result.get(0), is(equalTo(someFlattenedBytes)));
     }
 
     @Test
@@ -77,6 +79,7 @@ void validateWordDocumentOnUploadedDocument() {
     @Test
     void validateEncryptionOnUploadedDocumentWhenInvalidByteSupplied() {
         when(evidenceManagementService.download(FILE_BINARY_URL, AUTH)).thenReturn(someBytes);
+        when(documentConversionService.flattenPdfDocument(someBytes)).thenReturn(someFlattenedBytes);
         CaseDocument caseDocument = TestSetUpUtils.caseDocument(FILE_URL, FILE_NAME, FILE_BINARY_URL);
         BulkPrintRequest bulkPrintRequest = BulkPrintRequest.builder()
             .bulkPrintDocuments(singletonList(BulkPrintDocument.builder()
@@ -86,7 +89,7 @@ void validateEncryptionOnUploadedDocumentWhenInvalidByteSupplied() {
             .build();
 
         List<byte[]> result = service.downloadDocuments(bulkPrintRequest, AUTH);
-        assertThat(result.get(0), is(equalTo(someBytes)));
+        assertThat(result.get(0), is(equalTo(someFlattenedBytes)));
 
         List<String> errors = new ArrayList<>();
         service.validateEncryptionOnUploadedDocument(caseDocument, "1234", errors, AUTH);

src/test/java/uk/gov/hmcts/reform/finrem/caseorchestration/service/documentgenerator/DocumentConversionServiceTest.java

@@ -1,6 +1,5 @@
 package uk.gov.hmcts.reform.finrem.caseorchestration.service.documentgenerator;
 
-
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -19,6 +18,9 @@
 import uk.gov.hmcts.reform.finrem.caseorchestration.service.DocumentConversionService;
 import uk.gov.hmcts.reform.finrem.caseorchestration.service.evidencemanagement.EvidenceManagementDownloadService;
 
+import java.io.IOException;
+import java.io.InputStream;
+
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.notNullValue;
@@ -57,6 +59,20 @@ public void setUp() {
         documentToConvert.setBinaryUrl("binaryurl.com");
     }
 
+    @Test
+    public void flattenPdfDocument() throws IOException {
+
+        String editedPdfFixture = "/fixtures/D11Edited.pdf";
+        byte[] editedPdfBytes = loadResource(editedPdfFixture);
+
+        String flatPdfFixture = "/fixtures/D11Edited-flattened.pdf";
+        byte[] expectedFlatPdfBytes = loadResource(flatPdfFixture);
+
+        byte[] result = documentConversionService.flattenPdfDocument(editedPdfBytes);
+
+        assertThat(expectedFlatPdfBytes, is(result));
+    }
+
     @Test
     public void convertWordToPdf() {
         mockServer.expect(requestTo(PDF_SERVICE_URI))
@@ -91,4 +107,12 @@ public void getConvertedFilename() {
         assertThat(documentConversionService.getConvertedFilename("nodot"), is("nodot.pdf"));
         assertThat(documentConversionService.getConvertedFilename("word.docx"), is("word.pdf"));
     }
+
+    private byte[] loadResource(String testPdf) throws IOException {
+
+        try (InputStream resourceAsStream = getClass().getResourceAsStream(testPdf)) {
+            assert resourceAsStream != null;
+            return resourceAsStream.readAllBytes();
+        }
+    }
 }