Merge branch 'main' of git@github.com:Frooodle/Stirling-PDF.git into main

src/main/java/stirling/software/SPDF/config/EndpointConfiguration.java

@@ -65,6 +65,7 @@ public class EndpointConfiguration {
         addEndpointToGroup("PageOps", "pdf-organizer");
         addEndpointToGroup("PageOps", "rotate-pdf");
         addEndpointToGroup("PageOps", "multi-page-layout");
+        addEndpointToGroup("PageOps", "scale-pages");
         
         // Adding endpoints to "Convert" group
         addEndpointToGroup("Convert", "pdf-to-img");

src/main/java/stirling/software/SPDF/controller/api/other/ScalePagesController.java

@@ -0,0 +1,88 @@
+package stirling.software.SPDF.controller.api.other;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpHeaders;
+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.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+import com.itextpdf.kernel.geom.PageSize;
+import com.itextpdf.kernel.geom.Rectangle;
+import com.itextpdf.kernel.pdf.PdfDocument;
+import com.itextpdf.kernel.pdf.PdfPage;
+import com.itextpdf.kernel.pdf.PdfReader;
+import com.itextpdf.kernel.pdf.PdfWriter;
+import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
+import com.itextpdf.kernel.pdf.xobject.PdfFormXObject;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.media.Schema;
+
+@RestController
+public class ScalePagesController {
+
+	private static final Logger logger = LoggerFactory.getLogger(ScalePagesController.class);
+
+	@PostMapping(value = "/scale-pages", consumes = "multipart/form-data")
+	@Operation(summary = "Change the size of a PDF page/document", description = "This operation takes an input PDF file and the size to scale the pages to in the output PDF file.")
+	public ResponseEntity<byte[]> mergeMultiplePagesIntoOne(
+			@Parameter(description = "The input PDF file", required = true) @RequestParam("fileInput") MultipartFile file,
+			@Parameter(description = "The scale of pages in the output PDF. Acceptable values are A4.", required = true, schema = @Schema(type = "String", allowableValues = { "A4" })) @RequestParam("pageSize") String targetPageSize,
+            @Parameter(description = "The scale of the content on the pages of the output PDF. Acceptable values are floats.", required = true, schema = @Schema(type = "float")) @RequestParam("scaleFactor") float scaleFactor)
+			throws IOException {
+
+		if (!targetPageSize.equals("A4")) {
+			throw new IllegalArgumentException("pageSize must be A4");
+		}
+
+		byte[] bytes = file.getBytes();
+		PdfReader reader = new PdfReader(new ByteArrayInputStream(bytes));
+		PdfDocument pdfDoc = new PdfDocument(reader);
+
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		PdfWriter writer = new PdfWriter(baos);
+		PdfDocument outputPdf = new PdfDocument(writer);
+
+		PageSize pageSize = new PageSize(PageSize.A4); // TODO: This (and all other PageSize.A4) need to be dynamically changed in response to targetPageSize
+
+		int totalPages = pdfDoc.getNumberOfPages();
+
+		for (int i = 1; i <= totalPages; i++) {
+			PdfPage page = outputPdf.addNewPage(pageSize);
+			PdfCanvas pdfCanvas = new PdfCanvas(page);
+
+			// Get the page and calculate scaling factors
+			Rectangle rect = pdfDoc.getPage(i).getPageSize();
+			float scaleWidth = PageSize.A4.getWidth() / rect.getWidth();
+			float scaleHeight = PageSize.A4.getHeight() / rect.getHeight();
+			float scale = Math.min(scaleWidth, scaleHeight) * scaleFactor;
+            System.out.println("Scale: " + scale);
+
+			PdfFormXObject formXObject = pdfDoc.getPage(i).copyAsFormXObject(outputPdf);
+			float x = (PageSize.A4.getWidth() - rect.getWidth() * scale) / 2; // Center Page
+			float y = (PageSize.A4.getHeight() - rect.getHeight() * scale) / 2;
+
+			// Save the graphics state, apply the transformations, add the object, and then
+			// restore the graphics state
+			pdfCanvas.saveState();
+			pdfCanvas.concatMatrix(scale, 0, 0, scale, x, y);
+			pdfCanvas.addXObject(formXObject, 0, 0);
+			pdfCanvas.restoreState();
+		}
+
+		outputPdf.close();
+		byte[] pdfContent = baos.toByteArray();
+		pdfDoc.close();
+		return ResponseEntity.ok()
+				.header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + file.getOriginalFilename().replaceFirst("[.][^.]+$", "") + "_modified.pdf\"")
+				.body(pdfContent);
+	}
+}

src/main/java/stirling/software/SPDF/controller/web/OtherWebController.java

@@ -115,6 +115,11 @@ public class OtherWebController {
         return "other/multi-page-layout";
     }
     
-    
+    @GetMapping("/scale-pages")
+    @Hidden
+    public String scalePagesFrom(Model model) {
+        model.addAttribute("currentPage", "scale-pages");
+        return "other/scale-pages";
+    }
     
 }