Stirling-PDF/src/main/java/stirling/software/SPDF/controller/converters/ConvertImgPDFController.java

package stirling.software.SPDF.controller.converters;

import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import stirling.software.SPDF.utils.PdfUtils;

@Controller
public class ConvertImgPDFController {

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

	@GetMapping("/img-to-pdf")
	public String convertToPdfForm(Model model) {
		model.addAttribute("currentPage", "img-to-pdf");
		return "convert/img-to-pdf";
	}

	@GetMapping("/pdf-to-img")
	public String pdfToimgForm(Model model) {
		model.addAttribute("currentPage", "pdf-to-img");
		return "convert/pdf-to-img";
	}

	@PostMapping("/img-to-pdf")
	public ResponseEntity<byte[]> convertToPdf(@RequestParam("fileInput") MultipartFile file) throws IOException {
		// Convert the file to PDF and get the resulting bytes
		byte[] bytes = PdfUtils.convertToPdf(file.getInputStream());
		logger.info("File {} successfully converted to pdf", file.getOriginalFilename());

		return PdfUtils.bytesToWebResponse(bytes, file.getName() + "_coverted.pdf");
	}

	@PostMapping("/pdf-to-img")
	public ResponseEntity<byte[]> convertToImage(@RequestParam("fileInput") MultipartFile file,
			@RequestParam("imageFormat") String imageFormat) throws IOException {
		byte[] pdfBytes = file.getBytes();
		// returns bytes for image
		byte[] result = PdfUtils.convertFromPdf(pdfBytes, imageFormat.toLowerCase());
		HttpHeaders headers = new HttpHeaders();
		headers.setContentType(MediaType.parseMediaType(getMediaType(imageFormat)));
		headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
		ResponseEntity<byte[]> response = new ResponseEntity<>(result, headers, HttpStatus.OK);
		return response;
	}

	private String getMediaType(String imageFormat) {
		if (imageFormat.equalsIgnoreCase("PNG"))
			return "image/png";
		else if (imageFormat.equalsIgnoreCase("JPEG") || imageFormat.equalsIgnoreCase("JPG"))
			return "image/jpeg";
		else if (imageFormat.equalsIgnoreCase("GIF"))
			return "image/gif";
		else
			return "application/octet-stream";
	}

}