Stirling-PDF/src/main/java/stirling/software/SPDF/controller/api/RotationController.java

package stirling.software.SPDF.controller.api;

import java.io.IOException;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageTree;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.RequestPart;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import stirling.software.SPDF.utils.PdfUtils;

@RestController
public class RotationController {

    private static final Logger logger = LoggerFactory.getLogger(RotationController.class);

    @PostMapping(consumes = "multipart/form-data", value = "/rotate-pdf")
    public ResponseEntity<byte[]> rotatePDF(@RequestPart(required = true, value = "fileInput") MultipartFile pdfFile, @RequestParam("angle") Integer angle) throws IOException {

        // Load the PDF document
        PDDocument document = PDDocument.load(pdfFile.getBytes());

        // Get the list of pages in the document
        PDPageTree pages = document.getPages();

        for (PDPage page : pages) {
            page.setRotation(page.getRotation() + angle);
        }

        return PdfUtils.pdfDocToWebResponse(document, pdfFile.getOriginalFilename().replaceFirst("[.][^.]+$", "") + "_rotated.pdf");

    }

}