added upload and download method for PDF form handling

src/main/java/com/ffii/lioner/modules/lioner/pdf/web/Pdf2Controller.java

@@ -0,0 +1,103 @@
+package com.ffii.lioner.modules.lioner.pdf.web;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+import java.util.Map;
+import java.util.UUID;
+
+import org.apache.pdfbox.Loader;
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
+import org.apache.pdfbox.pdmodel.interactive.form.PDField;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.UrlResource;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.util.StringUtils;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+
+@RestController
+@RequestMapping("/pdf2")
+@CrossOrigin(origins = "", allowedHeaders = "")
+
+public class Pdf2Controller {
+
+    private final String UPLOAD_DIR = "uploads/"; // Configure this path
+
+    // Endpoint to download the blank AcroForm
+    @GetMapping("/download/template")
+    public ResponseEntity<Resource> downloadPdfTemplate() throws IOException {
+        Path filePath = Paths.get("src/main/resources/template/pdf/template_form.pdf").normalize(); // Path to your blank AcroForm
+        Resource resource = new UrlResource(filePath.toUri());
+
+        if (resource.exists()) {
+            return ResponseEntity.ok()
+                    .contentType(MediaType.APPLICATION_PDF)
+                    .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
+                    .body(resource);
+        } else {
+            return ResponseEntity.notFound().build();
+        }
+    }
+
+    // Endpoint to upload the edited PDF
+    @PostMapping("/upload")
+    public ResponseEntity<String> uploadEditedPdf(@RequestParam("file") MultipartFile file) {
+        try {
+            // Ensure upload directory exists
+            Path uploadPath = Paths.get(UPLOAD_DIR).toAbsolutePath().normalize();
+            Files.createDirectories(uploadPath);
+
+            String fileName = UUID.randomUUID().toString() + "-" + StringUtils.cleanPath(file.getOriginalFilename());
+            Path targetLocation = uploadPath.resolve(fileName);
+            Files.copy(file.getInputStream(), targetLocation, StandardCopyOption.REPLACE_EXISTING);
+
+            // --- Process the uploaded PDF (e.g., extract form data, save to DB) ---
+            //PDDocument document = PDDocument.load(targetLocation.toFile());
+            PDDocument document = Loader.loadPDF(targetLocation.toFile()); // Changed!
+            PDAcroForm acroForm = document.getDocumentCatalog().getAcroForm();
+
+            if (acroForm != null) {
+                // Example: Iterate through fields and print values
+                for (PDField field : acroForm.getFields()) {
+                    System.out.println("Field: " + field.getPartialName() + ", Value: " + field.getValueAsString());
+                    // You can save this data to a database, or perform other operations
+                }
+            }
+
+            document.close();
+            // -------------------------------------------------------------------
+
+            return ResponseEntity.ok("File uploaded and processed successfully: " + fileName);
+        } catch (IOException ex) {
+            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Could not upload or process file: " + ex.getMessage());
+        }
+    }
+
+    // Optional: Endpoint to upload only the form data (FDF/XFDF)
+    @PostMapping("/upload/data")
+    public ResponseEntity<String> uploadFormData(@RequestBody Map<String, String> formData) {
+        // This approach requires the frontend to extract form data and send it as JSON
+        // On the backend, you'd then use this data to populate the original PDF template
+        // and save a new PDF or just the data in your database.
+        // This is often more efficient than re-uploading the entire PDF.
+
+        // Example: Logic to process form data
+        System.out.println("Received form data: " + formData);
+        // You would then load your template PDF, fill it with this data, and save.
+        return ResponseEntity.ok("Form data received and processed.");
+    }
+}