auto split init

build.gradle

@@ -62,6 +62,8 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-actuator'
     implementation 'io.micrometer:micrometer-core'
 
+    implementation group: 'com.google.zxing', name: 'core', version: '3.5.1'
+
     developmentOnly("org.springframework.boot:spring-boot-devtools")
 
 }

src/main/java/stirling/software/SPDF/controller/api/other/AutoSplitPdfController.java

@@ -0,0 +1,132 @@
+package stirling.software.SPDF.controller.api.other;
+import java.awt.image.BufferedImage;
+import java.awt.image.DataBufferByte;
+import java.awt.image.DataBufferInt;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.rendering.PDFRenderer;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+import com.google.zxing.BinaryBitmap;
+import com.google.zxing.LuminanceSource;
+import com.google.zxing.MultiFormatReader;
+import com.google.zxing.NotFoundException;
+import com.google.zxing.PlanarYUVLuminanceSource;
+import com.google.zxing.Result;
+import com.google.zxing.common.HybridBinarizer;
+
+import stirling.software.SPDF.utils.WebResponseUtils;
+
+@RestController
+public class AutoSplitPdfController {
+
+    private static final String QR_CONTENT = "https://github.com/Frooodle/Stirling-PDF";
+
+    @PostMapping(value = "/auto-split-pdf", consumes = "multipart/form-data")
+    public ResponseEntity<byte[]> autoSplitPdf(@RequestParam("fileInput") MultipartFile file) throws IOException {
+        InputStream inputStream = file.getInputStream();
+        PDDocument document = PDDocument.load(inputStream);
+        PDFRenderer pdfRenderer = new PDFRenderer(document);
+
+        List<PDDocument> splitDocuments = new ArrayList<>();
+        List<ByteArrayOutputStream> splitDocumentsBoas = new ArrayList<>();  // create this list to store ByteArrayOutputStreams for zipping
+
+        for (int page = 0; page < document.getNumberOfPages(); ++page) {
+            BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 150);
+            String result = decodeQRCode(bim);
+
+            if(QR_CONTENT.equals(result) && page != 0) {
+                splitDocuments.add(new PDDocument());
+            }
+
+            if (!splitDocuments.isEmpty() && !QR_CONTENT.equals(result)) {
+                splitDocuments.get(splitDocuments.size() - 1).addPage(document.getPage(page));
+            } else if (page == 0) {
+                PDDocument firstDocument = new PDDocument();
+                firstDocument.addPage(document.getPage(page));
+                splitDocuments.add(firstDocument);
+            }
+        }
+
+        // After all pages are added to splitDocuments, convert each to ByteArrayOutputStream and add to splitDocumentsBoas
+        for (PDDocument splitDocument : splitDocuments) {
+            ByteArrayOutputStream baos = new ByteArrayOutputStream();
+            splitDocument.save(baos);
+            splitDocumentsBoas.add(baos);
+            splitDocument.close();
+        }
+
+        document.close();
+
+        // After this line, you can find your zip logic integrated
+        Path zipFile = Files.createTempFile("split_documents", ".zip");
+        String filename = file.getOriginalFilename().replaceFirst("[.][^.]+$", "");
+        byte[] data;
+        try (ZipOutputStream zipOut = new ZipOutputStream(Files.newOutputStream(zipFile))) {
+            // loop through the split documents and write them to the zip file
+            for (int i = 0; i < splitDocumentsBoas.size(); i++) {
+                String fileName = filename + "_" + (i + 1) + ".pdf"; // You should replace "originalFileName" with the real file name
+                ByteArrayOutputStream baos = splitDocumentsBoas.get(i);
+                byte[] pdf = baos.toByteArray();
+
+                // Add PDF file to the zip
+                ZipEntry pdfEntry = new ZipEntry(fileName);
+                zipOut.putNextEntry(pdfEntry);
+                zipOut.write(pdf);
+                zipOut.closeEntry();
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+        	data = Files.readAllBytes(zipFile);
+            Files.delete(zipFile);
+        }
+
+
+
+        // return the Resource in the response
+        return WebResponseUtils.bytesToWebResponse(data, filename + ".zip", MediaType.APPLICATION_OCTET_STREAM);
+    }
+
+
+    private static String decodeQRCode(BufferedImage bufferedImage) {
+        LuminanceSource source;
+
+        if (bufferedImage.getRaster().getDataBuffer() instanceof DataBufferByte) {
+            byte[] pixels = ((DataBufferByte) bufferedImage.getRaster().getDataBuffer()).getData();
+            source = new PlanarYUVLuminanceSource(pixels, bufferedImage.getWidth(), bufferedImage.getHeight(), 0, 0, bufferedImage.getWidth(), bufferedImage.getHeight(), false);
+        } else if (bufferedImage.getRaster().getDataBuffer() instanceof DataBufferInt) {
+            int[] pixels = ((DataBufferInt) bufferedImage.getRaster().getDataBuffer()).getData();
+            byte[] newPixels = new byte[pixels.length];
+            for (int i = 0; i < pixels.length; i++) {
+                newPixels[i] = (byte) (pixels[i] & 0xff);
+            }
+            source = new PlanarYUVLuminanceSource(newPixels, bufferedImage.getWidth(), bufferedImage.getHeight(), 0, 0, bufferedImage.getWidth(), bufferedImage.getHeight(), false);
+        } else {
+            throw new IllegalArgumentException("BufferedImage must have 8-bit gray scale, 24-bit RGB, 32-bit ARGB (packed int), byte gray, or 3-byte/4-byte RGB image data");
+        }
+
+        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
+
+        try {
+            Result result = new MultiFormatReader().decode(bitmap);
+            return result.getText();
+        } catch (NotFoundException e) {
+            return null; // there is no QR code in the image
+        }
+    }
+}

src/main/java/stirling/software/SPDF/controller/web/GeneralWebController.java

@@ -143,4 +143,12 @@ public String cropForm(Model model) {
         model.addAttribute("currentPage", "crop");
         return "crop";
     }
+
+
+    @GetMapping("/auto-split-pdf")
+    @Hidden
+    public String autoSPlitPDFForm(Model model) {
+        model.addAttribute("currentPage", "auto-split-pdf");
+        return "auto-split-pdf";
+    }
 }

src/main/resources/messages_en_GB.properties

@@ -149,6 +149,9 @@ home.adjust-contrast.desc=Adjust Contrast, Saturation and Brightness of a PDF
 home.crop.title=Crop PDF
 home.crop.desc=Crop a PDF to reduce its size (maintains text!)
 
+home.autoSplitPDF.title=Auto Split Pages
+home.autoSplitPDF.desc=Auto Split Scanned PDF with physical scanned page splitter QR Code
+
 error.pdfPassword=The PDF Document is passworded and either the password was not provided or was incorrect
 
 downloadPdf=Download PDF

src/main/resources/templates/auto-split-pdf.html

@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html th:lang="${#locale.toString()}" th:lang-direction="#{language.direction}" xmlns:th="http://www.thymeleaf.org">
+
+<th:block th:insert="~{fragments/common :: head(title=#{autoSplitPDF.title})}"></th:block>
+
+
+<body>
+    <th:block th:insert="~{fragments/common :: game}"></th:block>
+    <div id="page-container">
+        <div id="content-wrap">
+            <div th:insert="~{fragments/navbar.html :: navbar}"></div>
+            <br> <br>
+            <div class="container">
+                <div class="row justify-content-center">
+                    <div class="col-md-6">
+                        <h2 th:text="#{autoSplitPDF.header}"></h2>
+                        <form method="post" enctype="multipart/form-data" th:action="@{auto-split-pdf}">
+                            <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false)}"></div>
+                            <button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{autoSplitPDF.submit}"></button>
+
+                        </form>
+
+                    </div>
+                </div>
+            </div>
+
+        </div>
+        <div th:insert="~{fragments/footer.html :: footer}"></div>
+    </div>
+</body>
+</html>

src/main/resources/templates/fragments/navbar.html

@@ -54,6 +54,8 @@
         <div th:replace="~{fragments/navbarEntry :: navbarEntry ( 'remove-pages', 'images/file-earmark-x.svg', 'home.removePages.title', 'home.removePages.desc')}"></div>
 		<div th:replace="~{fragments/navbarEntry :: navbarEntry ( 'multi-page-layout', 'images/page-layout.svg', 'home.pageLayout.title', 'home.pageLayout.desc')}"></div>
 		<div th:replace="~{fragments/navbarEntry :: navbarEntry ( 'scale-pages', 'images/scale-pages.svg', 'home.scalePages.title', 'home.scalePages.desc')}"></div>
+		<div th:replace="~{fragments/navbarEntry :: navbarEntry ( 'auto-split-pdf', 'images/layout-split.svg', 'home.autoSplitPDF.title', 'home.autoSplitPDF.desc')}"></div>
+
 
     </div>
 </li>

src/main/resources/templates/home.html

@@ -77,7 +77,7 @@ <h1 class="display-4" th:text="${@appName}"></h1>
                 <div th:replace="~{fragments/card :: card(id='auto-rename', cardTitle=#{home.auto-rename.title}, cardText=#{home.auto-rename.desc}, cardLink='auto-rename', svgPath='images/fonts.svg')}"></div>
                 <div th:replace="~{fragments/card :: card(id='adjust-contrast', cardTitle=#{home.adjust-contrast.title}, cardText=#{home.adjust-contrast.desc}, cardLink='adjust-contrast', svgPath='images/adjust-contrast.svg')}"></div>
  				<div th:replace="~{fragments/card :: card(id='crop', cardTitle=#{home.crop.title}, cardText=#{home.crop.desc}, cardLink='crop', svgPath='images/crop.svg')}"></div>
-
+                <div th:replace="~{fragments/card :: card(id='auto-split-pdf', cardTitle=#{home.autoSplitPDF.title}, cardText=#{home.autoSplitPDF.desc}, cardLink='auto-split-pdf', svgPath='images/layout-split.svg')}"></div>
 
 
             </div>