Convert PDF to Docx, powerpoint and others (#90)

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

@@ -0,0 +1,101 @@
+package stirling.software.SPDF.utils;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.io.IOUtils;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.multipart.MultipartFile;
+public class PDFToFile {
+    public ResponseEntity<byte[]> processPdfToOfficeFormat(MultipartFile inputFile, String outputFormat, String libreOfficeFilter)
+            throws IOException, InterruptedException {
+
+        if (!"application/pdf".equals(inputFile.getContentType())) {
+            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+        }
+
+        // Get the original PDF file name without the extension
+        String originalPdfFileName = inputFile.getOriginalFilename();
+        String pdfBaseName = originalPdfFileName.substring(0, originalPdfFileName.lastIndexOf('.'));
+
+        // Validate output format
+        List<String> allowedFormats = Arrays.asList("doc", "docx", "odt", "ppt", "pptx", "odp", "rtf", "html","xml","txt:Text");
+        if (!allowedFormats.contains(outputFormat)) {
+            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+        }
+        
+        Path tempInputFile = null;
+        Path tempOutputDir = null;
+        byte[] fileBytes;
+        // Prepare response
+        HttpHeaders headers = new HttpHeaders();
+
+        try {
+            // Save the uploaded file to a temporary location
+            tempInputFile = Files.createTempFile("input_", ".pdf");
+            Files.copy(inputFile.getInputStream(), tempInputFile, StandardCopyOption.REPLACE_EXISTING);
+
+            // Prepare the output directory
+            tempOutputDir = Files.createTempDirectory("output_");
+
+            // Run the LibreOffice command
+            List<String> command = new ArrayList<>(Arrays.asList(
+                    "soffice", "--infilter=" + libreOfficeFilter, "--convert-to", outputFormat, "--outdir", tempOutputDir.toString(), tempInputFile.toString()
+            ));
+            int returnCode = ProcessExecutor.getInstance(ProcessExecutor.Processes.LIBRE_OFFICE).runCommandWithOutputHandling(command);
+
+            // Get output files
+            List<File> outputFiles = Arrays.asList(tempOutputDir.toFile().listFiles());
+
+            if (outputFiles.size() == 1) {
+                // Return single output file
+                File outputFile = outputFiles.get(0);
+                headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
+                if(outputFormat.equals("txt:Text")) {
+                    outputFormat="txt";
+                }
+                headers.setContentDispositionFormData("attachment", pdfBaseName + "." + outputFormat);
+                fileBytes = FileUtils.readFileToByteArray(outputFile);
+            } else {
+                // Return output files in a ZIP archive
+                headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
+                headers.setContentDispositionFormData("attachment", pdfBaseName + "To" + outputFormat + ".zip");
+                ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+                ZipOutputStream zipOutputStream = new ZipOutputStream(byteArrayOutputStream);
+
+                for (File outputFile : outputFiles) {
+                    ZipEntry entry = new ZipEntry(outputFile.getName());
+                    zipOutputStream.putNextEntry(entry);
+                    FileInputStream fis = new FileInputStream(outputFile);
+                    IOUtils.copy(fis, zipOutputStream);
+                    fis.close();
+                    zipOutputStream.closeEntry();
+                }
+
+                zipOutputStream.close();
+                fileBytes = byteArrayOutputStream.toByteArray();
+            }
+
+        } finally {
+            // Clean up the temporary files
+            if (tempInputFile != null)
+                Files.delete(tempInputFile);
+            if (tempOutputDir != null)
+                FileUtils.deleteDirectory(tempOutputDir.toFile());
+        }
+        return new ResponseEntity<>(fileBytes, headers, HttpStatus.OK);
+    }
+}

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

@@ -1,13 +1,13 @@
 package stirling.software.SPDF.utils;
 
 import java.io.BufferedReader;
-import java.util.concurrent.ConcurrentHashMap;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.Semaphore;
 public class ProcessExecutor {