Added support for multiple adding an image overlay to multiple pages (#86)

src/main/java/stirling/software/SPDF/controller/OverlayImageController.java

@@ -28,11 +28,11 @@ public class OverlayImageController {
 
     @PostMapping("/add-image")
     public ResponseEntity<byte[]> overlayImage(@RequestParam("fileInput") MultipartFile pdfFile, @RequestParam("fileInput2") MultipartFile imageFile, @RequestParam("x") float x,
-            @RequestParam("y") float y) {
+            @RequestParam("y") float y, @RequestParam("everyPage") boolean everyPage) {
         try {
             byte[] pdfBytes = pdfFile.getBytes();
             byte[] imageBytes = imageFile.getBytes();
-            byte[] result = PdfUtils.overlayImage(pdfBytes, imageBytes, x, y);
+            byte[] result = PdfUtils.overlayImage(pdfBytes, imageBytes, x, y, everyPage);
 
             return PdfUtils.bytesToWebResponse(result, pdfFile.getOriginalFilename().replaceFirst("[.][^.]+$", "") + "_overlayed.pdf");
         } catch (IOException e) {

src/main/java/stirling/software/SPDF/utils/PdfUtils.java

@@ -188,28 +188,35 @@ public class PdfUtils {
         }
     }
 
-    public static byte[] overlayImage(byte[] pdfBytes, byte[] imageBytes, float x, float y) throws IOException {
+    public static byte[] overlayImage(byte[] pdfBytes, byte[] imageBytes, float x, float y, boolean everyPage) throws IOException {
+
+            PDDocument document = PDDocument.load(new ByteArrayInputStream(pdfBytes));
 
-        try (PDDocument document = PDDocument.load(new ByteArrayInputStream(pdfBytes))) {
             // Get the first page of the PDF
-            PDPage page = document.getPage(0);
+            int pages = document.getNumberOfPages();
+            for (int i = 0; i < pages; i++) {
+                PDPage page = document.getPage(i);
                 try (PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true)) {
                     // Create an image object from the image bytes
                     PDImageXObject image = PDImageXObject.createFromByteArray(document, imageBytes, "");
                     // Draw the image onto the page at the specified x and y coordinates
                     contentStream.drawImage(image, x, y);
                     logger.info("Image successfully overlayed onto PDF");
+                    if (everyPage == false && i == 0) {
+                        break;
+                    }
+                } catch (IOException e) {
+                    // Log an error message if there is an issue overlaying the image onto the PDF
+                    logger.error("Error overlaying image onto PDF", e);
+                    throw e;
+                }
+
             }
         // Create a ByteArrayOutputStream to save the PDF to
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         document.save(baos);
         logger.info("PDF successfully saved to byte array");
         return baos.toByteArray();
-        } catch (IOException e) {
-            // Log an error message if there is an issue overlaying the image onto the PDF
-            logger.error("Error overlaying image onto PDF", e);
-            throw e;
-        }
         }
 
     public static ResponseEntity<byte[]> iTextDocToWebResponse(Document document, String docName) throws IOException, DocumentException {

src/main/resources/templates/add-image.html

@@ -26,6 +26,9 @@
                             <div class="form-group">
                                 <label for="y">Y</label> <input type="number" class="form-control" id="y" name="y" step="0.01" required>
                             </div>
+                            <div class="form-group">
+                                <input type="checkbox" id="everyPage" name="everyPage" value="true"> <label for="everyPage">Every Page?</label>
+                            </div>
                             <button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{addImage.submit}"></button>
                         </form>
                     </div>