mirror of
https://github.com/Stirling-Tools/Stirling-PDF.git
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286 lines
14 KiB
Java
286 lines
14 KiB
Java
package stirling.software.SPDF.utils;
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import java.awt.Graphics;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URLEncoder;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.security.KeyPair;
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import java.security.KeyStore;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.cert.Certificate;
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import java.security.cert.X509Certificate;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipOutputStream;
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import javax.imageio.ImageIO;
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import org.apache.pdfbox.pdmodel.PDDocument;
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import org.apache.pdfbox.pdmodel.PDPage;
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import org.apache.pdfbox.pdmodel.PDPageContentStream;
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import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
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import org.apache.pdfbox.rendering.ImageType;
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import org.apache.pdfbox.rendering.PDFRenderer;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.multipart.MultipartFile;
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public class PdfUtils {
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private static final Logger logger = LoggerFactory.getLogger(PdfUtils.class);
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public static ResponseEntity<byte[]> boasToWebResponse(ByteArrayOutputStream baos, String docName) throws IOException {
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return PdfUtils.bytesToWebResponse(baos.toByteArray(), docName);
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}
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public static ResponseEntity<byte[]> boasToWebResponse(ByteArrayOutputStream baos, String docName, MediaType mediaType) throws IOException {
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return PdfUtils.bytesToWebResponse(baos.toByteArray(), docName, mediaType);
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}
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public static ResponseEntity<byte[]> bytesToWebResponse(byte[] bytes, String docName, MediaType mediaType) throws IOException {
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// Return the PDF as a response
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HttpHeaders headers = new HttpHeaders();
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headers.setContentType(mediaType);
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headers.setContentLength(bytes.length);
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String encodedDocName = URLEncoder.encode(docName, StandardCharsets.UTF_8.toString()).replaceAll("\\+", "%20");
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headers.setContentDispositionFormData("attachment", encodedDocName);
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return new ResponseEntity<>(bytes, headers, HttpStatus.OK);
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}
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public static ResponseEntity<byte[]> bytesToWebResponse(byte[] bytes, String docName) throws IOException {
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return bytesToWebResponse(bytes, docName, MediaType.APPLICATION_PDF);
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}
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public static byte[] convertFromPdf(byte[] inputStream, String imageType, ImageType colorType, boolean singleImage, int DPI) throws IOException, Exception {
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try (PDDocument document = PDDocument.load(new ByteArrayInputStream(inputStream))) {
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PDFRenderer pdfRenderer = new PDFRenderer(document);
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int pageCount = document.getNumberOfPages();
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List<BufferedImage> images = new ArrayList<>();
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// Create images of all pages
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for (int i = 0; i < pageCount; i++) {
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images.add(pdfRenderer.renderImageWithDPI(i, 300, colorType));
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}
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if (singleImage) {
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// Combine all images into a single big image
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BufferedImage combined = new BufferedImage(images.get(0).getWidth(), images.get(0).getHeight() * pageCount, BufferedImage.TYPE_INT_RGB);
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Graphics g = combined.getGraphics();
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for (int i = 0; i < images.size(); i++) {
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g.drawImage(images.get(i), 0, i * images.get(0).getHeight(), null);
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}
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images = Arrays.asList(combined);
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}
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// Create a ByteArrayOutputStream to save the image(s) to
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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if (singleImage) {
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// Write the image to the output stream
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ImageIO.write(images.get(0), imageType, baos);
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// Log that the image was successfully written to the byte array
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logger.info("Image successfully written to byte array");
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} else {
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// Zip the images and return as byte array
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try (ZipOutputStream zos = new ZipOutputStream(baos)) {
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for (int i = 0; i < images.size(); i++) {
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BufferedImage image = images.get(i);
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try (ByteArrayOutputStream baosImage = new ByteArrayOutputStream()) {
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ImageIO.write(image, imageType, baosImage);
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// Add the image to the zip file
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zos.putNextEntry(new ZipEntry(String.format("page_%d.%s", i + 1, imageType.toLowerCase())));
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zos.write(baosImage.toByteArray());
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}
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}
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// Log that the images were successfully written to the byte array
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logger.info("Images successfully written to byte array as a zip");
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}
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}
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return baos.toByteArray();
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} catch (IOException e) {
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// Log an error message if there is an issue converting the PDF to an image
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logger.error("Error converting PDF to image", e);
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throw e;
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}
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}
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public static byte[] imageToPdf(MultipartFile[] files, boolean stretchToFit, boolean autoRotate) throws IOException {
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try (PDDocument doc = new PDDocument()) {
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for (MultipartFile file : files) {
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// Create a temporary file for the image
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File imageFile = Files.createTempFile("image", ".jpg").toFile();
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try (FileOutputStream fos = new FileOutputStream(imageFile); InputStream input = file.getInputStream()) {
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byte[] buffer = new byte[1024];
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int len;
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// Read from the input stream and write to the file
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while ((len = input.read(buffer)) != -1) {
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fos.write(buffer, 0, len);
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}
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logger.info("Image successfully written to file: {}", imageFile.getAbsolutePath());
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} catch (IOException e) {
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logger.error("Error writing image to file: {}", imageFile.getAbsolutePath(), e);
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throw e;
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}
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// Create a new PDF page
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PDPage page = new PDPage();
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doc.addPage(page);
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// Create an image object from the image file
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PDImageXObject image = PDImageXObject.createFromFileByContent(imageFile, doc);
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float pageWidth = page.getMediaBox().getWidth();
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float pageHeight = page.getMediaBox().getHeight();
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if (autoRotate && ((image.getWidth() > image.getHeight() && pageHeight > pageWidth) || (image.getWidth() < image.getHeight() && pageWidth > pageHeight))) {
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// Rotate the page 90 degrees if the image better fits the page in landscape
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// orientation
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page.setRotation(90);
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pageWidth = page.getMediaBox().getHeight();
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pageHeight = page.getMediaBox().getWidth();
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}
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try (PDPageContentStream contentStream = new PDPageContentStream(doc, page)) {
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if (stretchToFit) {
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if (page.getRotation() == 0 || page.getRotation() == 180) {
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// Stretch the image to fit the whole page
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contentStream.drawImage(image, 0, 0, pageWidth, pageHeight);
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} else {
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// Adjust the width and height of the page when rotated
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contentStream.drawImage(image, 0, 0, pageHeight, pageWidth);
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}
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logger.info("Image successfully added to PDF, stretched to fit page");
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} else {
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// Ensure the image fits the page but maintain the image's aspect ratio
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float imageAspectRatio = (float) image.getWidth() / (float) image.getHeight();
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float pageAspectRatio = pageWidth / pageHeight;
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// Determine the scale factor to fit the image onto the page
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float scaleFactor = 1.0f;
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if (imageAspectRatio > pageAspectRatio) {
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// Image is wider than the page, scale to fit the width
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scaleFactor = pageWidth / image.getWidth();
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} else {
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// Image is taller than the page, scale to fit the height
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scaleFactor = pageHeight / image.getHeight();
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}
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// Calculate the position of the image on the page
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float xPos = (pageWidth - (image.getWidth() * scaleFactor)) / 2;
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float yPos = (pageHeight - (image.getHeight() * scaleFactor)) / 2;
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// Draw the image onto the page
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if (page.getRotation() == 0 || page.getRotation() == 180) {
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contentStream.drawImage(image, xPos, yPos, image.getWidth() * scaleFactor, image.getHeight() * scaleFactor);
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} else {
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// Adjust the width and height of the page when rotated
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contentStream.drawImage(image, yPos, xPos, image.getHeight() * scaleFactor, image.getWidth() * scaleFactor);
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}
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logger.info("Image successfully added to PDF, maintaining aspect ratio");
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}
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} catch (IOException e) {
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logger.error("Error adding image to PDF", e);
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throw e;
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}
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// Delete the temporary file
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imageFile.delete();
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}
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// Create a ByteArrayOutputStream to save the PDF to
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ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
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doc.save(byteArrayOutputStream);
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logger.info("PDF successfully saved to byte array");
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return byteArrayOutputStream.toByteArray();
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}
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}
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public static X509Certificate[] loadCertificateChainFromKeystore(InputStream keystoreInputStream, String keystorePassword) throws Exception {
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KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
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keystore.load(keystoreInputStream, keystorePassword.toCharArray());
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String alias = keystore.aliases().nextElement();
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Certificate[] certChain = keystore.getCertificateChain(alias);
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X509Certificate[] x509CertChain = new X509Certificate[certChain.length];
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for (int i = 0; i < certChain.length; i++) {
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x509CertChain[i] = (X509Certificate) certChain[i];
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}
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return x509CertChain;
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}
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public static KeyPair loadKeyPairFromKeystore(InputStream keystoreInputStream, String keystorePassword) throws Exception {
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KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
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keystore.load(keystoreInputStream, keystorePassword.toCharArray());
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String alias = keystore.aliases().nextElement();
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PrivateKey privateKey = (PrivateKey) keystore.getKey(alias, keystorePassword.toCharArray());
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Certificate cert = keystore.getCertificate(alias);
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PublicKey publicKey = cert.getPublicKey();
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return new KeyPair(publicKey, privateKey);
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}
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public static byte[] overlayImage(byte[] pdfBytes, byte[] imageBytes, float x, float y, boolean everyPage) throws IOException {
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PDDocument document = PDDocument.load(new ByteArrayInputStream(pdfBytes));
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// Get the first page of the PDF
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int pages = document.getNumberOfPages();
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for (int i = 0; i < pages; i++) {
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PDPage page = document.getPage(i);
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try (PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true)) {
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// Create an image object from the image bytes
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PDImageXObject image = PDImageXObject.createFromByteArray(document, imageBytes, "");
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// Draw the image onto the page at the specified x and y coordinates
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contentStream.drawImage(image, x, y);
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logger.info("Image successfully overlayed onto PDF");
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if (!everyPage && i == 0) {
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break;
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}
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} catch (IOException e) {
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// Log an error message if there is an issue overlaying the image onto the PDF
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logger.error("Error overlaying image onto PDF", e);
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throw e;
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}
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}
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// Create a ByteArrayOutputStream to save the PDF to
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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document.save(baos);
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logger.info("PDF successfully saved to byte array");
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return baos.toByteArray();
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}
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public static ResponseEntity<byte[]> pdfDocToWebResponse(PDDocument document, String docName) throws IOException {
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// Open Byte Array and save document to it
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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document.save(baos);
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// Close the document
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document.close();
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return PdfUtils.boasToWebResponse(baos, docName);
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}
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}
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